نتایج جستجو برای: c biological n fixation

تعداد نتایج: 2261024  

Journal: :Plant physiology 1977
G J Bethlenfalvay D A Phillips

Photosynthetic efficiency, primary productivity, and N(2) reduction were determined in peas (Pisum sativum L. var. Alaska) grown at light intensities ranging from severely limiting to saturating. Plants grown under higher light intensities showed greater carboxylation and light capture potential and higher rates of net C exchange. Uptake of N(2), computed from measured C(2)H(2) reduction and H(...

Journal: :Agriculture 2021

The aim of this study was to investigate the transfer N from different legumes cherry tomatoes in intercropping system under residual straw previous green corn crop using 15N natural abundance method. We also investigated temporal variation nitrogen a tomato, biological fixation (BNF) legumes, and concentration cultivated intercrop succession. experimental design complete randomized block with ...

2007
Christa R. Schwintzer CHRISTA R. SCHWINTZER

The acetylene reduction assay was used to measure nonsymbiotic and symbiotic nitrogen fixation in a weakly minerotrophic peatland throughout the ice-free season. Nonsymbiotic nitrogen fixation was found in surface materials and subsurface peat. In surface materials, nitrogenase activity measured in the field contributed about 0.6 kg N ha-' yr-', was closely associated with Sphagnum, but was not...

Journal: :Biogeosciences 2021

Abstract. Representing biological nitrogen fixation (BNF) is an important challenge for coupled carbon (C) and (N) land models. Initial representations of BNF in models applied simplified phenomenological relationships. More recent are mechanistic include the dynamic response symbiotic to N limitation plant growth. However, they generally do not competitive dynamics between N-fixing non-fixing ...

2006
Angelicque E. White Yvette H. Spitz David M. Karl Ricardo M. Letelier

We conducted laboratory experiments to assess the bioelemental plasticity of cultures of Trichodesmium IMS101 under phosphorus (P)-replete, P-restricted, and light-limited conditions. The results reveal a high degree of stoichiometric flexibility. Specifically, Trichodesmium IMS101 is capable of growth with carbon (C) : nitrogen (N) : P ratios of C585656 : N90610 : P1, approximately six times h...

Journal: :Plant physiology 1989
M E Rasche D J Arp

Dihydrogen, a by-product of biological nitrogen fixation, is a competitive inhibitor of N(2) reduction by nitrogenase. To evaluate the significance of H(2) inhibition in vivo, we have measured the apparent inhibition constant for H(2) inhibition of N(2) reduction in Bradyrhizobium japonicum bacteroids isolated from soybean nodules. The rate of N(2) reduction was measured as ammonia production b...

Journal: :Internationale Revue der gesamten Hydrobiologie und Hydrographie 1913

2006
M. R. Mulholland

Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract While we now know that marine N 2 fixation is a significant source of new nitrogen (N) in the marine environment, little is known about the fate of this production, de...

2009
Anna Lagerström

Initially after catastrophic disturbance ecosystems undergo a build-up phase but in the long term absence of catastrophic disturbance ecosystems can enter a phase of decline called ecosystem retrogression. It is characterised by reduced productivity, decomposition rates and rates of nutrient cycling as a consequence of nutrient limitation. Over the course of long-term soil development, phosphor...

Journal: :Freshwater Biology 2022

Biological nitrogen (N) fixation, the microbial conversion of N2 gas to ammonia, makes N available food webs. Low-N streams often have a high relative abundance N-fixing taxa, suggesting that fixation is an important source in these systems. Despite this potential, stream has not been well-characterised, particularly compared lakes and marine environments. One unknown contributions various orga...

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