Variations in carbon, nitrogen and phosphorus stoichiometry during a growth season within a Platycladus orientalis plantation

作者: 时间:2020-06-04 点击数:

作者: Manyi Du1, Huanying Feng1, Lianjin Zhang1, Shunxiang Pei1, Di Wu1, Xu Gao1,Qingyun Kong1, Yan Xu1, Xuebing Xin1*, Xiaolu Tang2

单位1Experimental Center of Forestry in Northern China, Chinese Academy of Forestry, Beijing, P.R. China;2College of Earth Sciences, Chengdu University of Technology, Chengdu, Sichuan, P.R. China

期刊:Polish Journal of Environmental Studies, 2020, 10.15244/pjoes/117759

基金:Fundamental Research Funds for the Central Nonprofit Research Institution of CAF (grant Nos. CAFYBB2014QA036 and CAFYBB2018GC010) and the National Key Research and Development Program of China (grant No. 2016YFD060020304).

摘要:Knowledge of seasonal variations of carbon (C), nitrogen (N), and phosphorus (P) concentrations plus C:N:P ratios can provide insight into the dynamics of biological processes, nutrient cycling, resource acquisition, and mass partitioning in plants and soils. Platycladus orientalis (Cupressaceae) is an important tree species distributed throughout northern China. We studied the seasonal dynamics of C, N, and P concentrations and their stoichiometry in leaves, branches, roots, and soil in a P. orientalis plantation. Plant and soil C, N, and P concentrations, and their stoichiometry varied significantly among ecosystem components and growth season sampling times, indicating nutrient allocation patterns and mobility in the P. orientalis plantation. Accurately quantifying and comparing C:N:P stoichiometry in the plant and soil of P. orientalis requires a study of plant organs, soil depth, and sampling times. The mean N concentration in leaves was 14.06 g kg-1 and the mean N:P ratio was 11.82, indicating that the growth of P. orientalis was N limited during the growing season. N and P concentrations and stoichiometry in plants were correlated with those in soil, suggesting coupled nutrient control between plant and soil. The C:N:P ratio was regulated in different components of the ecosystem.

关键词:Platycladus orientalis,C:N:P stoichiometry, plant-soil, nutrient limitation