文献类型： 外文期刊
第一作者： Wang, Ruzhen
作者： Wang, Ruzhen;Cao, Yanzhuo;Liu, Heyong;Li, Bo;Jiang, Yong;Lu, Linyou;Cao, Yanzhuo;Zhang, Yuge;Sardans, Jordi;Penuelas, Josep;Sardans, Jordi;Penuelas, Josep;Dijkstra, Feike A.
作者机构：
关键词： Plant-soil interactions; Soil impoverishment; Plant nitrogen uptake; Nutrient concentration; Elemental stoichiometry; Plant resistance
期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）
ISSN： 0032-079X
年卷期： 2021 年 467 卷 1-2 期
页码：
收录情况： SCI
摘要： Aims We investigated whether plant resistance to soil impoverishment would depend on their flexibility in taking up nutrients and on maintaining elemental stoichiometry. Methods We mixed sand with grassland soil in mass proportions of 0, 10, 30, 50 and 70% to simulate soil impoverishment as caused by a gradient of desertification intensity and examined how plant nitrogen (N) uptake ((NH4NO3)-N-15 and (NH4NO3)-N-15 labelling) and nutrient stoichiometry were associated with plant growth responses of a sedge (Carex duriuscula) and a forb (Potentilla chinensis). Results With increasing intensity of soil impoverishment, plant biomass, cover and density decreased for C. duriuscula, but not for P. chinensis. Interestingly, uptake of both (NO3-)-N-15 and (NH4+)-N-15 increased for the sedge but not for the forb, with the former species showing stronger preference of NO3-. However, the sedge showed decreasing nutrient contents and concentrations of phosphorus (P) and magnesium (Mg), and thus increasing stoichiometric ratios of N:P and calcium (Ca):Mg. In contrast, the forb maintained its biomass by showing strong stability in nutrient content, concentration and stoichiometry. Conclusions Stability of N uptake and nutrient stoichiometry were associated with higher resistance to soil impoverishment of the forb than the sedge. Our study highlights the importance of stability in nutrient uptake and stoichiometry for determining plant-species resistance to nutrient-poor conditions.
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