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Niche differentiation and higher uptake of available nitrogen maintained the productivity of alpine meadow at early degradation

文献类型：期刊论文

作者Lai, Chimin3,4; Peng, Fei3,5; Sun, Jianbo3,4; Zhou, Jun6; Li, Chengyang2; Xu, Xingliang7; Chen, Xiaojie3,4; You, Quangang3; Sun, Hongyang6; Sun, Jian8
刊名BIOLOGY AND FERTILITY OF SOILS
出版日期2022-11-10
页码15
ISSN号0178-2762
关键词(15) N tracer N uptake Inorganic N Organic N N-cycling genes Niche differentiation
DOI10.1007/s00374-022-01679-0
通讯作者Peng, Fei(pengfei@lzb.ac.cn) ; Xue, Xian(xianxue@lzb.ac.cn)
英文摘要A short-term in situ (15) N labeling experiment was conducted to investigate whether the N uptake and preference for different forms of available soil N for dominant plant species and soil microorganisms relate to the plant community productivity change at the no degradation stage, early stage of degradation, and late stage of degradation in an alpine meadow on the Qinghai-Tibetan Plateau. At the early stage of degradation in the alpine meadow, aboveground net primary productivity decreased, while belowground net primary productivity increased. As a result, the total net primary productivity was unchanged at the early stage of degradation. Both aboveground and belowground net primary productivity significantly decreased at the late stage of degradation compared with the non-degraded meadows. Plants and microorganisms mainly absorbed inorganic N and preferred NH4+ at the non-degraded meadows where available soil N (the total concentration of exchangeable NH4+, NO3-, and dissolved organic N) was maintained at a high level of 60.9 mu g N g(-1) dry soil, indicating an N-use chemical niche overlap. Plants and microorganisms showed a niche differentiation at the early stage of degradation where available soil N decreased to a medium level of 44.6 mu g N g(-1) dry soil; plants preferred NO3-, while microorganisms took up more NH4+. In contrast, microorganisms increased their uptake of organic N, while plants assimilated more inorganic N, indicating that plants and microorganisms showed a niche differentiation where available soil N decreased to a low level of 26.6 mu g N g(-1) dry soil at the late stage of degradation. The higher N uptake (30% increase of N uptake compared with non-degraded meadows) of dominant plant species and niche differentiation in using available soil N between plants and microorganisms are two mechanisms maintaining the total community net primary productivity, even when available soil N decreased at the early stage of degradation. Plants and microorganisms also showed a niche differentiation when available N declined further at the late stage of degradation. However, the N uptake by dominant plant species greatly declined at the late stage of degradation (76% reduction of N uptake compared with non-degraded meadows), which might explain the community net primary productivity reduction (78% lower compared with non-degraded meadows).
WOS关键词NUTRIENT-ACQUISITION STRATEGIES ; QINGHAI-TIBETAN PLATEAU ; ORGANIC-NITROGEN ; INORGANIC NITROGEN ; SOIL-NITROGEN ; BIOMASS ALLOCATION ; PLANT COMPETITION ; PERMAFROST THAW ; GRASSLAND ; MICROORGANISMS
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0305] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0603] ; National Natural Science Foundation of China[41907386] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS研究方向Agriculture
语种英语
出版者SPRINGER
WOS记录号WOS:000880512200001
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.igsnrr.ac.cn/handle/311030/186807]  
专题中国科学院地理科学与资源研究所
通讯作者Peng, Fei; Xue, Xian
作者单位1.Univ Western Australia, Inst Agr, Perth, WA, Australia
2.Lingnan Normal Univ, Dept Geog, Zhanjiang, Peoples R China
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou, Peoples R China
4.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
5.Chinese Acad Sci, Beiluhe Observat & Res Stn Frozen Soil Engn & Env, Lanzhou, Peoples R China
6.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu, Peoples R China
7.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China
8.Chinese Acad Sci, Inst Tibetan Plateau Res, Stake Key Lab Earth Syst Resources & Environm Tib, Beijing, Peoples R China
9.Univ Western Australia, Sch Biol Sci, Perth, WA, Australia
推荐引用方式
GB/T 7714		 Lai, Chimin,Peng, Fei,Sun, Jianbo,et al. Niche differentiation and higher uptake of available nitrogen maintained the productivity of alpine meadow at early degradation[J]. BIOLOGY AND FERTILITY OF SOILS,2022:15.
APA Lai, Chimin.,Peng, Fei.,Sun, Jianbo.,Zhou, Jun.,Li, Chengyang.,...&Lambers, Hans.(2022).Niche differentiation and higher uptake of available nitrogen maintained the productivity of alpine meadow at early degradation.BIOLOGY AND FERTILITY OF SOILS,15.
MLA Lai, Chimin,et al."Niche differentiation and higher uptake of available nitrogen maintained the productivity of alpine meadow at early degradation".BIOLOGY AND FERTILITY OF SOILS (2022):15.

入库方式： OAI收割

来源：地理科学与资源研究所

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