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Symbiotic nitrogen fixation by legumes in two Chinese grasslands estimated with the N-15 dilution technique
Yang, Baijie1,2; Qiao, Na2,3; Xu, Xingliang1; Ouyang, Hua1
2011-09-01
Source PublicationNUTRIENT CYCLING IN AGROECOSYSTEMS
Volume91Issue:1Pages:91-98
AbstractSymbiotic nitrogen (N) fixation by legumes was investigated using the N-15 dilution technique in two Chinese grasslands: one in the north-eastern Tibetan Plateau and the other in Inner Mongolia in China. A small amount (0.03 g N m(-2)) of N-15 labelled (NH4)(2)SO4 fertilizer was evenly distributed in two soils. One month after the N-15 addition, four legumes (Astragalus sp., Gueldenstaedtia diversifolia, Oxytropis ochrocephala and Trigonella ruthenica) in the alpine meadow and two legumes (Thermopsis lanceolata and Melissitus ruthenica) in the temperate steppe were collected. Several non-legume plant species were harvested as the reference. Above-ground biomass of legumes ranged from 8 to 24 g m(-2) in the alpine meadow and from 11 to 35 g m(-2) in the temperate steppe. The reference plants showed distinctly higher N-15 atom% excess than legumes (0.08% vs. 0.02% in the alpine meadow, 0.10% vs. 0.02% in the temperate steppe). The N derived from atmosphere (%Ndfa) ranged from 50 to 90% N in the alpine meadow, while it ranged from 85 to 92% in the temperate steppe. Based on the legume above-ground biomass, total symbiotic N-2-fixation rate was estimated to be 1.00 g N m(-2) year(-1) in the alpine meadow and 1.15 g N m(-2) year(-1) in the temperate steppe. These N inputs by legumes can account for 9% of the gap between the N demand and the seasonal N release by mineralization in the alpine Kobresia grassland and 20% in the temperate Leymus grassland, respectively. Considering additional contribution of the root biomass, we suggest that biological N-2-fixation by legumes plays an important role in the cycling of N in both Kobresia and Leymus grasslands on an annual scale.
SubtypeArticle
KeywordN-15 Tracer Alpine Meadow Temperate Steppe Kobresia Humilis Leymus Chinensis
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS Subject ExtendedAgriculture
WOS KeywordN-2 FIXATION ; ALTITUDINAL GRADIENT ; ALPINE TUNDRA ; COMMUNITIES ; ALPS ; NUTRITION ; DYNAMICS
Indexed BySCI
Language英语
WOS SubjectSoil Science
WOS IDWOS:000293913100008
PublisherSPRINGER
Citation statistics
Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/68020
Collection中国科学院地理科学与资源研究所
Corresponding AuthorXu, Xingliang
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Forest Ecosyst Res Ctr, Xishuangbanna Trop Bot Garden, Kunming 650223, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Yang, Baijie,Qiao, Na,Xu, Xingliang,et al. Symbiotic nitrogen fixation by legumes in two Chinese grasslands estimated with the N-15 dilution technique[J]. NUTRIENT CYCLING IN AGROECOSYSTEMS,2011,91(1):91-98.
APA Yang, Baijie,Qiao, Na,Xu, Xingliang,&Ouyang, Hua.(2011).Symbiotic nitrogen fixation by legumes in two Chinese grasslands estimated with the N-15 dilution technique.NUTRIENT CYCLING IN AGROECOSYSTEMS,91(1),91-98.
MLA Yang, Baijie,et al."Symbiotic nitrogen fixation by legumes in two Chinese grasslands estimated with the N-15 dilution technique".NUTRIENT CYCLING IN AGROECOSYSTEMS 91.1(2011):91-98.
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