期刊
JOURNAL OF ARID ENVIRONMENTS
卷 172, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jaridenv.2019.104037
关键词
Growth rate hypothesis; Drylands; Environmental change; Leymus chinensis; Nutrient strategy; N:P ratio
资金
- National Natural Science Foundation of China [31570438]
- Hundred Talents Program of Shaanxi Province [A289021701]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JZ3002]
The growth-rate hypothesis (GRH) says that fast-growing organisms have relatively high P content and lower N:P ratios because they need more P-rich ribosomal RNA (rRNA) to fuel increased protein-synthesis. However, there is a lack of understanding for how environmental factors influence plant N:P stoichiometry, and it is unknown if the GRH applies to vascular plants in drylands. Here, we test the GRH in dryland plants by measuring biomass N:P ratios in Leymus chinensis, a perennial dryland grass commonly found in Inner Mongolia grasslands. We determined relative growth rates (RGR) and adaptation to changes in water, N, and P availability in substrate. Generally, adding water, N, and P to substrate stimulated growth. Increased water supply decreased plant N concentrations, but increased plant P concentrations. As expected by GRH, N:P ratios in plant biomass decreased as water supply and RGR increased. Biomass N:P ratios increased as N substrate addition and RGR increased, but decreased as P substrate addition and RGR increased. We conclude that plant N:P stoichiometry reflects substrate nutrient supply. Our results suggest that the GRH also applies to terrestrial dryland photoautotrophs, but is dependent upon resources.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据