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Divergent responses of nitrogen availability to aridity in drylands

文献类型：期刊论文

作者Wang, Jing2; Wen, Xuefa1,2,3,4
刊名PLANT AND SOIL
出版日期2022-09-08
页码15
ISSN号0032-079X
关键词Drylands N supply Plant N demand N availability delta N-15
DOI10.1007/s11104-022-05673-1
通讯作者Wang, Jing(wangjing.15b@igsnrr.ac.cn) ; Wen, Xuefa(wenxf@igsnrr.ac.cn)
英文摘要Purpose Drylands are generally drought-stressed and have low soil fertility. While negative effects of drought on vegetation productivity are undisputed, it is unclear whether water limits productivity alone or in combination with low nitrogen (N) availability (N supply relative to plant N demand). Methods One aridity transect was established in each - the Loess Plateau (LP), Inner Mongolia Plateau (MP), and Tibetan Plateau (TP). Concentrations and delta N-15 of soil and leaf at the species level were measured, and ecosystem N processes were simulated using DeNitrification-DeComposition model. Results Model simulations of total N supply and its components (N deposition, biological N-2 fixation, and gross N mineralization) and modelled gross primary productivity (plant N demand) decreased with increasing aridity. delta N-15(soil) and community-weighted delta N-15(leaf) of non-N-2-fixing species increased with aridity, however, difference in delta N-15 between soil and leaf (delta N-15(Soil-leaf)) exhibited an increasing trend with aridity in MP and TP. delta N-15(Soil-leaf) at LP was variable but did not change significantly with aridity. These results implied that N availability increased with aridity in MP and TP but remained low due to high plant N demand in LP. We found that delta N-15(Soil-leaf) is a better indicator of N availability than delta N-15(soil) and delta N-15(leaf). Vegetation productivity was negatively correlated with water availability, but not with N availability along aridity gradients, indicating that vegetation productivity in these ecosystems was constrained by water rather than N availability. Conclusion Whether vegetation productivity is limited by N availability in drylands depends on how much water is available for plant growth.
WOS关键词N-15 NATURAL-ABUNDANCE ; NET PRIMARY PRODUCTIVITY ; PLANT DELTA-N-15 ; SOIL DELTA-N-15 ; ECOSYSTEMS ; LIMITATION ; CLIMATE ; PRECIPITATION ; RAINFALL ; DEPOSITION
资助项目National Natural Science Foundation of China[41991234] ; National Natural Science Foundation of China[32001137] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23070202]
WOS研究方向Agriculture ; Plant Sciences
语种英语
出版者SPRINGER
WOS记录号WOS:000852281700001
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
源URL[http://ir.igsnrr.ac.cn/handle/311030/182727]  
专题中国科学院地理科学与资源研究所
通讯作者Wang, Jing; Wen, Xuefa
作者单位1.Nanjing Univ Informat Sci Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 101408, Peoples R China
4.Univ Chinese Acad Sci, Beijing Yanshan Earth Crit Zone Natl Res Stn, Beijing 101408, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Jing,Wen, Xuefa. Divergent responses of nitrogen availability to aridity in drylands[J]. PLANT AND SOIL,2022:15.
APA Wang, Jing,&Wen, Xuefa.(2022).Divergent responses of nitrogen availability to aridity in drylands.PLANT AND SOIL,15.
MLA Wang, Jing,et al."Divergent responses of nitrogen availability to aridity in drylands".PLANT AND SOIL (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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