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Symbiotic nitrogen fixation and interspecific transfer by Caragana microphylla in a temperate grassland with N-15 dilution technique
Ouyang S. N.; Tian, Y. Q.; Liu, Q. Y.; Zhang, L.; Sun, Y.; Xu, X. L.; Liu, Y. H.
Source PublicationApplied Soil Ecology
2016
Volume108
Pages221-227
KeywordCaragana microphylla Nitrogen fixation Nitrogen transfer Temperate grassland N-15 dilution technique natural-abundance subterranean clover forage legumes n-2 fixation soil pasture n-2-fixation limitation community lucerne
AbstractQuantification of symbiotic nitrogen (N) fixation by legume and its N transfer to the neighboring plants is an important prerequisite to understand the N cycling in the N-limited grasslands. The objective of this study is to explore the symbiotic N-2-fixation by a legume shrub (Caragana microphylla) and its N transfer to coexisting non-legumes with the N-15 dilution technique. A paired experimental design (legume vs. non-legume quadrats) was used. A small amount (0.03 gN m(-2)) of N-15-labeled KNO3 (99.5% N-15 enrichment) was evenly distributed in these paired labeled quadrats, with only water additions as the control. One month after the N-15 addition, aboveground parts of C. microphylla and four non-legumes of reference plants (i.e. Cleistogenes squarrosa, Artemisia frigida, Artemisia capillaris and Leymus chinensis) in both labeled and controlled quadrats were harvested. Symbiotic N-2-fixation and transfer to non-legumes were estimated based on the aboveground biomass and its N-15 in these plant species. The N derived from the atmosphere (%Ndfa) of C microphylla was estimated to range from 84 to 95%. According to the aboveground biomass of C. microphylla, symbiotic N-2-fixation was estimated to be 4.3 gm(-2) yr(-1) in the mixed C. microphylla community in the temperate grassland of northern China. The amount of N transfer from C microphylla to their coexisting plants varied with plant species. About half of above N in C. squarrosa derived from C microphylla, while L. chinensis showed almost no N derived from C microphylla. Both A. frigida and A. capillaris showed about 36% and 37% of N derived from C microphylla, respectively. Totally, about 17% of N fixed in the aboveground part of C microphylla was transferred to its associated species. Considering the amount of N fixed and transferred by C microphylla, we conclude that C microphylla plays an important role in the N cycling of temperate grasslands in northern China. (C) 2016 Elsevier B.V. All rights reserved.
Indexed BySCI
Language英语
ISSN0929-1393
DOI10.1016/j.apsoil.2016.08.011
Citation statistics
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43156
Collection历年回溯文献
Recommended Citation
GB/T 7714
Ouyang S. N.,Tian, Y. Q.,Liu, Q. Y.,et al. Symbiotic nitrogen fixation and interspecific transfer by Caragana microphylla in a temperate grassland with N-15 dilution technique. 2016.
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