• UNDERSTAND
    Soil Dynamics
  • UNDERSTAND
    Fertilizer Application
  • UNDERSTAND
    Plant Physiology

Boden, Pflanzen & Dünger

Die Leistungsfähigkeit einer bestimmten Pflanze oder der Ertrag einer gesamten Ernte hängt stark von der Fruchtbarkeit des Bodens ab. Die Bodenfruchtbarkeit wird von der Konzentration bestimmter Elemente und der biologischen Aktivität im Boden bestimmt. Um ein vollständiges Bild von der Fruchtbarkeit eines Bodens zu erhalten, sind Parameter wie die Konzentrationen von Kohlenstoff, Stickstoff und Schwefel sowie die Differenzierung von Kohlenstoff in den Anteil an organischem und anorganischem Gesamtkohlenstoff (TOC oder TIC) relevant. Die Verbesserung der Bodengesundheit durch Düngung erfordert genaue Messungen einer Vielzahl von Böden und Düngemitteln. Elementars breite Palette von Elementaranalysatoren bietet auch für anspruchsvolle Aufgaben individuelle Lösungen.

C/N-Verhältnis in Böden

Der Kohlenstoff- und Stickstoffgehalt des Bodens steht in direktem Zusammenhang mit seiner Fähigkeit, ein gesundes Pflanzenwachstum zu unterstützen. Der vario MAX cube ist speziell für die Bodenanalyse geeignet: bei Einwaagen von bis zu 5 g Boden spielt Probeninhomogenität keine Rolle. Die automatische Ascheentfernung reduziert den Wartungsaufwand und erhöht gleichzeitig die Produktivität. Die einzigartige Advanced Purge and Trap Technologie ermöglicht eine saubere Peaktrennung, sogar bei C:N Elementverhälntissen von bis zu 7000:1. Zusätzliche Optionen wie Argon als Trägergas, oder die Messung von Schwefel oder TOC, machen den vario MAX cube zu einer vielseitigen, robusten Lösung für die Elementaranalyse von Böden.

Stickstoff in Düngemitteln

Der rapid MAX N exceed ist der ideale Analysator, um Stickstoff in Dünger und Düngemitteln zu bestimmen. Mit Probengrößen von bis zu 5 Gramm anorganischen Materials oder 1 Gramm organischen Materials reduziert sich die Probenvorbereitung in vielen Fällen auf das Einwiegen der Probe in die wiederverwendbaren Stahltiegel.

Schwefel in Düngemitteln

Mit der Verringerung von externen Schwefelquellen wird das Aufrechterhalten eines optimalen Schwefelgehalts im Boden durch Düngung immer wichtiger. Der vario MACRO cube ist der weltweit einzige Analysator für Makroproben (bis zu 1 g), der in der Lage ist, Kohlenstoff, Wasserstoff, Stickstoff und Schwefel in einer einzigen Probe zu messen. Der große Dynamikbereich des Wärmeleitfähigkeitsdetektors ermöglicht die genaue Bestimmung von Schwefel aus einem Bruchteil von einem Prozent bis zu 100 % mit nur einem Kalibrationsbereich. Ob nur der Schwefelgehalt einer Probe oder jegliche Kombination von CHNS interessiert, der vario MACRO cube bietet schnelle, zuverlässige Ergebnisse bei geringer Wartung, so dass Sie Zeit und Geld sparen.

Kohlenstofffraktionen

Die Analyse des Gesamtgehalts von organischem Kohlenstoff (TOC) in Böden liefert wesentliche Informationen über mikrobielle Aktivität und Anteil an organischer Substanz und hilft, Böden und Sedimente zu charakterisieren und zu bewerten. Böden können auch eine große Menge an biologisch nicht verfügbarem anorganischen Kohlenstoff (TIC) enthalten, typischerweise in Form von Carbonaten. Elementarer Kohlenstoff (ROC) ist eine weitere, häufige Kohlenstoffquelle, die ebenfalls nicht bioverfügbar ist. Die separate Messung dieser dritten Kohlenstofffraktion kann eine viel genauere Bestimmung des bioverfügbaren und damit umweltrelevanten TOC im Vergleich zum Ansäuerungsverfahren ergeben. Der revolutionäre soli TOC cube misst diese drei Kohlenstofffraktionen in Böden und anderen Feststoffen in einer einzigen Probe ohne korrosive Säuren und liefert zuverlässige Ergebnisse bei minimalem Aufwand.

Publikationen im Bereich Boden- und Pflanzenwissenschaften mit unseren Geräten

Unsere Kunden nutzen unsere Geräte für erstaunliche Forschungsprojekte im Bereich der Boden- und Pflanzenwissenschaften. Um Ihnen zu zeigen, wie unsere Kunden ihre Forschung durchführen und wie unsere IRMS-Geräte eingesetzt werden, haben wir eine Reihe von Fachpublikationen gesammelt, die unsere Produkte namentlich nennen. Die Informationen zu diesen Fachartikeln finden Sie unten. Durch Klicken auf den Link werden Sie zur Website des jeweiligen Zeitschriftenverlags weitergeleitet, wo Sie die Publikation herunterladen können.

Wenn Sie unsere Publikationsdatenbank durchsuchen möchten oder die Liste der Ergebnisse an sich selbst oder an Ihre Kollegen mailen möchten, dann werfen Sie einen Blick auf unsere gesamte Publikationsdatenbank.

172 Ergebnisse:

Organic nitrogen uptake is a significant contributor to nitrogen economy of subtropical epiphytic bryophytes
Scientific Reports (2016)
Liang Song, Hua-Zheng Lu, Xing-Liang Xu, Su Li, Xian-Meng Shi, Xi Chen, Yi Wu, Jun-Biao Huang, Quan Chen, Shuai Liu, Chuan-Sheng Wu, Wen-Yao Liu, P. Kenrick, P. R. Crane, Y.-L. Qiu, Y. Cho, J. C. Cox, J. D. Palmer, P. G. Gensel, M. Proctor, B. D. Mishler,

Without any root contact with the soil, epiphytic bryophytes must experience and explore poor, patchy, and heterogeneous habitats; while, the nitrogen (N) uptake and use strategies of these organisms remain uncharacterized, which obscures their roles in the N cycle. To investigate the N sources, N preferences, and responses to enhanced N deposition in epiphytic bryophytes, we carried out an in situ manipulation experiment via the 15N labelling technique in an Asian cloud forest. Epiphytic bryophytes obtained more N from air deposition than from the bark, but the contribution of N from the bark was non-negligible. Glycine accounted for 28.4% to 44.5% of the total N in bryophyte tissue, which implies that organic N might serve as an important N source. Increased N deposition increased the total N uptake, but did not alter the N preference of the epiphytic bryophytes. This study provides sound evidence that epiphytic bryophytes could take up N from the bark and wet deposition in both organic and inorganic N forms. It is thus important to consider organic N and bark N sources, which were usually neglected, when estimating the role of epiphytic bryophytes in N cycling and the impacts of N deposition on epiphytic bryophytes in cloud forests.
Schlagworte: nitrogen , soil , elem

Altitudinal changes in leaf hydraulic conductance across five Rhododendron species in eastern Nepal
Tree Physiology (2016)
Haruhiko Taneda, Dhan Raj Kandel, Atsushi Ishida, Hiroshi Ikeda

This study investigated altitudinal changes in leaf-lamina hydraulic conductance (KL) and leaf morphological traits related to KL using five Rhododendron species growing at different altitudes (2500–4500 m above sea level) in Jaljale Himal region in eastern Nepal. Sun leaves were collected from the highest and the lowest altitude populations of each species, and KL was measured with a high pressure flow meter method. Leaf-lamina hydraulic conductance ranged from 7.7 to 19.3 mmol m−2 s−1 MPa−1 and was significantly positively correlated with altitude. The systematic increase with altitude was also found in KL, leaf nitrogen content and stomatal pore index. These relationships suggest that plants from higher-altitude habitats had a large CO2 supply to the intercellular space in a leaf and high CO2 assimilation capacity, which enables efficient photosynthesis at high altitude. The variation in KL was associated with the variation in several leaf morphological traits. High KL was found in leaves with small leaf area and round shape, both of which result in shorter major veins. These results suggest that the short major veins were important for efficient water transport in unlobed leaves of Rhododendron species. The extent of lignification in bundle sheaths and bundle sheath extension was associated with KL. Lignified compound primary walls inhibit water conduction along apoplastic routes. All species analyzed had heterobaric leaves, in which bundle sheath extensions developed from minor veins, but strongly lignified compound primary walls were found in Rhododendron species with low KL. It is still unclear why cell walls in bundle sheath at minor veins were markedly lignified in Rhododendron species growing at lower altitude. The lignified cell wall provides a high pathogenic resistance to infection and increases the mechanical strength of cell wall. The data imply that lignified bundle sheath may provide a trade-off between leaf hydraulic efficiency and leaf mechanical toughness or longevity.

N/P imbalance as a key driver for the invasion of oligothrophic dune systems by a woody legume
Oikos (2016)
Florian Ulm, Christine Hellmann, Cristina Cruz, Cristina Máguas

Oligotrophic ecosystems, previously considered to be more resilient to invasive plants, are now recognised to be highly vulnerable to invasions. In these systems, woody legumes show belowground ecosystem engineering characteristics that enable invasion, however, the underlying processes are not well understood. Using a Portuguese primary dune ecosystem as an oligotrophic model system, belowground biomass pools, turnover rates and stoichiometry of a native (Stauracanthus spectabilis) and an invasive legume (Acacia longifolia) were compared and related to changes in the foliage of the surrounding native (Corema album) vegetation. We hypothesized that the invasive legume requires less phosphorus per unit of biomass produced and exhibits an enhanced nutrient turnover compared to the native vegetation, which could drive invasion by inducing a systemic N/P imbalance. Compared with the native legumes, A. longifolia plants had larger canopies, higher SOM levels and lower tissue P concentrations. These attributes were strongly related to legume influence as measured by increased foliar N content and less depleted δ15N signatures in the surrounding C. album vegetation. Furthermore, greater root and rhizosphere mass and increased nutrient turnover in the rhizosphere of the invader were associated with depleted foliar P in C. album. Our results emphasize that while A. longifolia itself maintains an efficient phosphorus use in biomass production, at the same time it exerts a strong impact on the N/P balance of the native system. Moreover, this study highlights the engineering of a belowground structure of roots and rhizosphere as a crucial driver for invasion, due to its central role in nutrient turnover. These findings provide new evidence that, under nutrient-limited conditions, considering co-limitation and nutrient cycling in oligotrophic systems is essential to understand the engineering character of invasive woody legumes.
Schlagworte: nitrogen , soil , ecol , elem

Soil organic carbon stocks in estuarine and marine mangrove ecosystems are driven by nutrient colimitation of P and N
Ecology and Evolution (2016)
Christian Weiss, Joanna Weiss, Jens Boy, Issi Iskandar, Robert Mikutta, Georg Guggenberger

Mangroves play an important role in carbon sequestration, but soil organic carbon (SOC) stocks differ between marine and estuarine mangroves, suggesting differing processes and drivers of SOC accumulation. Here, we compared undegraded and degraded marine and estuarine mangroves in a regional approach across the Indonesian archipelago for their SOC stocks and evaluated possible drivers imposed by nutrient limitations along the land-to-sea gradients. SOC stocks in natural marine mangroves (271–572 Mg ha−1 m−1) were much higher than under estuarine mangroves (100–315 Mg ha−1 m−1) with a further decrease caused by degradation to 80–132 Mg ha−1 m−1. Soils differed in C/N ratio (marine: 29–64; estuarine: 9–28), δ15N (marine: −0.6 to 0.7‰; estuarine: 2.5 to 7.2‰), and plant-available P (marine: 2.3–6.3 mg kg−1; estuarine: 0.16–1.8 mg kg−1). We found N and P supply of sea-oriented mangroves primarily met by dominating symbiotic N2 fixation from air and P import from sea, while mangroves on the landward gradient increasingly covered their demand in N and P from allochthonous sources and SOM recycling. Pioneer plants favored by degradation further increased nutrient recycling from soil resulting in smaller SOC stocks in the topsoil. These processes explained the differences in SOC stocks along the land-to-sea gradient in each mangrove type as well as the SOC stock differences observed between estuarine and marine mangrove ecosystems. This first large-scale evaluation of drivers of SOC stocks under mangroves thus suggests a continuum in mangrove functioning across scales and ecotypes and additionally provides viable proxies for carbon stock estimations in PES or REDD schemes.
Schlagworte: carbon , nitrogen , soil , ecol , elem

Common mycorrhizal networks amplify competition by preferential mineral nutrient allocation to large host plants
New Phytologist (2016)
Joanna Weremijewicz, Leonel da Silveira Lobo O'Reilly Sternberg, David P. Janos

Arbuscular mycorrhizal (AM) fungi interconnect plants in common mycorrhizal networks (CMNs) which can amplify competition among neighbors. Amplified competition might result from the fungi supplying mineral nutrients preferentially to hosts that abundantly provide fixed carbon, as suggested by research with organ-cultured roots. We examined whether CMNs supplied 15N preferentially to large, nonshaded, whole plants. We conducted an intraspecific target–neighbor pot experiment with Andropogon gerardii and several AM fungi in intact, severed or prevented CMNs. Neighbors were supplied 15N, and half of the target plants were shaded. Intact CMNs increased target dry weight (DW), intensified competition and increased size inequality. Shading decreased target weight, but shaded plants in intact CMNs had mycorrhizal colonization similar to that of sunlit plants. AM fungi in intact CMNs acquired 15N from the substrate of neighbors and preferentially allocated it to sunlit, large, target plants. Sunlit, intact CMN, target plants acquired as much as 27% of their nitrogen from the vicinity of their neighbors, but shaded targets did not. These results suggest that AM fungi in CMNs preferentially provide mineral nutrients to those conspecific host individuals best able to provide them with fixed carbon or representing the strongest sinks, thereby potentially amplifying asymmetric competition below ground.
Schlagworte: carbon , nitrogen , soil , elem

Nitrogen fixation by the reluctant diazotroph Cylindrospermopsis raciborskii (Cyanophyceae)
Journal of Phycology (2016)
Anusuya Willis, Ann W. Chuang, Michele A. Burford

Nitrogen fixation has been proposed as a mechanism that allows the diazotrophic cyanobacterium Cylindrospermopsis raciborskii to bloom in nitrogen-limited freshwater systems. However, it is unclear whether dinitrogen-fixation (N2-fixation) can supplement available dissolved inorganic nitrogen (DIN) for growth, or only provides minimum nitrogen (N) for cell maintenance under DIN deplete conditions. Additionally, the rate at which cells can switch between DIN use and N2-fixation is unknown. This study investigated N2-fixation under a range of nitrate concentrations. Cultures were grown with pre-treatments of nitrate replete (single dose 941 μmol NO3 ̅. L−1) and N-free conditions and then either received a single dose of 941 μmol NO3 ̅. L−1 (N941), 118 μmol. L−1 NO3 ̅ (N118) or 0 N. Heterocysts appeared from days 3 - 5 when treatments of high NO3 ̅ were transferred to N starvation media (N941:N0), and from day-5 in N941 transferred to N118 treatments. Conversely, transferring cells from N0 to N941 resulted in heterocysts being discarded from day-3 and day 5 for N0:N118. Heterocyst appearance correlated with a detectable rate of N2-fixation and up-regulation of nifH gene expression, the discard of heterocysts occurred after sequential reduction of nifH expression and N2-fixation. Nitrate uptake rates were not affected by pre-treatment, suggesting no regulation or saturation of this uptake pathway. These data demonstrate that for C. raciborskii, N2-fixation is regulated by the production or discard of heterocysts. In conclusion, this study has shown that N2-fixation only provides enough N to support relatively low growth under N-limited conditions, and does not supplement nitrate to increase growth rates.
Schlagworte: carbon , nitrogen , soil , ecol , elem

Can intercropping with the world's three major beverage plants help improve the water use of rubber trees?
Journal of Applied Ecology (2016)
Junen Wu, Wenjie Liu, Chunfeng Chen

1.The dramatic expansion of rubber plantations in mainland Southeast Asia and Southwest China has caused many eco-environmental problems, especially negative hydrological consequences. These problems have gradually worsened and pose formidable threats to rubber agriculture, especially in light of increasingly frequent extreme weather events. Although rubber-based agroforestry systems are regarded as the best solution for improving the sustainability of rubber agriculture and environmental conservation, plant water use and related interactions have rarely been examined in such systems. 2.We primarily used stable isotope (δD, δ18O, and δ13C) methods to test whether intercropping could improve the water use and extreme weather tolerance (extreme cold and drought in our study) of rubber trees in three types of promising agroforestry systems (i.e. rubber with tea, coffee, and cocoa) in Xishuangbanna, China. 3.We found that the rubber tree is a drought-avoidance plant with strong plasticity with respect to water uptake. This characteristic is reflected by its ability to cope with serious seasonal drought, allowing it to avoid interspecific competition for water. The rubber trees showed wasteful water behaviour unless they were intercropped with tea or coffee. However, these intercropped species exhibited drought-tolerance strategies and maintained lower water use efficiencies to strengthen their competitive capacity for surface soil water. The stable δ13C values of the intercrop leaves indicated that all the agroforestry systems have stable internal microclimatic environments or higher resistance. 4.Synthesis and applications. This study suggests that interspecific competition for water can enhance the water use efficiency of drought-avoidance plants (i.e. rubber trees) and lead to complementarity between the root distributions of plants in rubber agroforestry systems (i.e. rubber with tea, coffee, and cocoa). All agroforestry systems have higher resistance, but tea was the most suitable intercrop in terms of water use because the interspecific competition for water was moderate and the agroforestry system retained much more soil water and improved the water use efficiency of the rubber tree. Considering the root characteristics of the tea trees, we suggest that the crops selected for intercropping with rubber trees should have short lateral roots and a moderate amount of fine roots that overlap with the roots of the rubber trees in the shallow soil layer.
Schlagworte: carbon , nitrogen , soil , ecol , elem

Improved Discrimination for Brassica Vegetables Treated with Agricultural Fertilizers Using a Combined Chemometric Approach
Journal of Agricultural and Food Chemistry (2016)
Yuwei Yuan, Guixian Hu, Tianjin Chen, Ming Zhao, Yongzhi Zhang, Yong Li, Xiahong Xu, Shengzhi Shao, Jiahong Zhu, Qiang Wang, Karyne M. Rogers

Multielement and stable isotope (δ13C, δ15N, δ2H, δ18O, 207Pb/206Pb, and 208Pb/206Pb) analyses were combined to provide a new chemometric approach to improve the discrimination between organic and conventional Brassica vegetable production. Different combinations of organic and conventional fertilizer treatments were used to demonstrate this authentication approach using Brassica chinensis planted in experimental test pots. Stable isotope analyses (δ15N and δ13C) of B. chinensis using elemental analyzer–isotope ratio mass spectrometry easily distinguished organic and chemical fertilizer treatments. However, for low-level application fertilizer treatments, this dual isotope approach became indistinguishable over time. Using a chemometric approach (combined isotope and elemental approach), organic and chemical fertilizer mixes and low-level applications of synthetic and organic fertilizers were detectable in B. chinensis and their associated soils, improving the detection limit beyond the capacity of indivi...
Schlagworte: carbon , nitrogen , oxygen , food , soil , elem

Isotope signatures of N2O emitted from vegetable soil: Ammonia oxidation drives N2O production in NH4+-fertilized soil of North China
Scientific Reports (2016)
Wei Zhang, Yuzhong Li, Chunying Xu, Qiaozhen Li, Wei Lin, P. M. Smith, O. Edenhofer, S. A. Montzka, E. J. Dlugokencky, J. H. Butler, R. Prinn, P. Smith, B. Metz, S. K. Lam, R. Well, H. Flessa, X. Lu, X. T. Ju, V. Römheld, H. W. Hu, X. Zhu, M. Burger, T. A

Nitrous oxide (N2O) is a potent greenhouse gas. In North China, vegetable fields are amended with high levels of N fertilizer and irrigation water, which causes massive N2O flux. The aim of this study was to determine the contribution of microbial processes to N2O production and characterize isotopic signature effects on N2O source partitioning. We conducted a microcosm study that combined naturally abundant isotopologues and gas inhibitor techniques to analyze N2O flux and its isotopomer signatures [δ15Nbulk, δ18O, and SP (intramolecular 15N site preference)] that emitted from vegetable soil after the addition of NH4+ fertilizers. The results show that ammonia oxidation is the predominant process under high water content (70% water-filled pore space), and nitrifier denitrification contribution increases with increasing N content. δ15Nbulk and δ18O of N2O may not provide information about microbial processes due to great shifts in precursor signatures and atom exchange, especially for soil treated with NH4+ fertilizer. SP and associated two end-member mixing model are useful to distinguish N2O source and contribution. Further work is needed to explore isotopomer signature stability to improve N2O microbial process identification.
Schlagworte: nitrogen , oxygen , soil , gashead

Spring Nitrogen Uptake, Use Efficiency, and Partitioning for Growth in Iris germanica ‘Immortality’
HortScience (2016)
Xiaojie Zhao, Guihong Bi, Richard L. Harkess, Jac J. Varco, Eugene K. Blythe

This study investigated how spring nitrogen (N) application affects N uptake and growth performance in tall bearded (TB) iris ‘Immortality’ (Iris germanica L.). Container-grown iris plants were treated with 0, 5, 10, 15, or 20 mM N from 15NH415NO3 through fertigation using a modified Hoagland’s solution twice a week for 6 weeks in Spring 2013. Increasing N rate increased plant height, total plant dry weight (DW), and N content. Total N content was closely related to total plant DW. The allocation of N to different tissues followed a similar trend as the allocation of DW. In leaves, roots, and rhizomes, increasing N rate increased N uptake and decreased carbon (C) to N ratio (C/N ratio). Leaves were the major sink for N derived from fertilizer (NDFF). As N supply increased, DW accumulation in leaves increased, whereas DW accumulation in roots and rhizomes was unchanged. This indicates increasing N rate contributed more to leaf growth in spring. Nitrogen uptake efficiency (NupE) had a quadratic relationship with increasing N rate and was highest in the 10 mM N treatment, which indicates 10 mM was the optimal N rate for improving NupE in this study.