Liu Dong, Zhang Jian, Biswas Asim, Cao Jianjun, Xie Huanjie, Qi Xuanxuan
College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China.
School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph, ON NIG 2W1, Canada.
Plants (Basel). 2020 Oct 6;9(10):1323. doi: 10.3390/plants9101323.
Leaf stoichiometry can enhance our understanding of leaf elements' (C, N and P) concentrations and their corresponding ratios in an ecosystem with seasonal environment changes. This study quantified the seasonal dynamics of leaf stoichiometry of from Yangguan wetland, Dunhuang, China as a case study example. The leaf C concentration (LC) of changed between seasons and was 392.26 (g×kg), 417.35 (g×kg) and 392.58 (g×kg) in spring, summer and autumn, respectively. Leaf N and P concentrations (LN and LP) were 23.49 (g×kg), and 17.54 (g×kg) and 5.86 (g×kg), and 1.00 (g×kg), 0.75 (g×kg) and 0.16 (g×kg), respectively, in the three seasons. The maximum (77.68) and the minimum values (17.00) of LC:LN were observed in the autumn and spring, respectively. Seasonal variations in LC:LP also showed a similar trend, with the greatest value of 3015.91 in autumn and the lowest value of 429.39 in spring. However, the highest (45.67) and the lowest values (24.18) of LN:LP were observed in autumn and summer, respectively, indicating that the growth of was mainly affected by P. Based on these results, it can be concluded that adopted a competition strategy during the early growth stage but took on a defense life strategy at the late growth stage to cope with various environments.
叶化学计量学能够增进我们对生态系统中叶片元素（碳、氮和磷）浓度及其相应比率随季节环境变化情况的理解。本研究以中国敦煌阳关湿地为例，对[具体植物名称未给出]叶化学计量学的季节动态进行了量化。[具体植物名称未给出]的叶片碳浓度（LC）随季节变化，春季、夏季和秋季分别为392.26（克/千克）、417.35（克/千克）和392.58（克/千克）。三个季节中叶片氮和磷浓度（LN和LP）分别为23.49（克/千克）、17.54（克/千克）和5.86（克/千克），以及1.00（克/千克）、0.75（克/千克）和0.16（克/千克）。LC:LN的最大值（77.68）和最小值（17.00）分别出现在秋季和春季。LC:LP的季节变化也呈现类似趋势，秋季最大值为3015.91，春季最小值为429.39。然而，LN:LP的最高值（45.67）和最低值（24.18）分别出现在秋季和夏季，表明[具体植物名称未给出]的生长主要受磷的影响。基于这些结果，可以得出结论，[具体植物名称未给出]在生长早期采取竞争策略，但在生长后期采取防御生存策略以应对各种环境。
