Nitrogen addition alters aboveground C:N:P stoichiometry of plants but not for belowground in an Inner Mongolia grassland

文献类型： 外文期刊

第一作者： Wang, Ziqi

作者： Wang, Ziqi;An, Yixin;Li, Ying;Yu, Qiang;Wang, Jie;Wang, Xu;Wu, Honghui;Yang, Tian;Zhang, Yunlong;Bian, Jianlin;Ren, Haiyan;Lkhagva, Ariuntsetseg

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关键词： nitrogen deposition; C:N:P stoichiometry; grassland ecosystem; community level; belowground

期刊名称：JOURNAL OF PLANT ECOLOGY （ 影响因子：2.7； 五年影响因子：2.6 ）

ISSN： 1752-9921

年卷期： 2024 年 17 卷 1 期

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收录情况： SCI

摘要： Nitrogen (N) deposition exhibits significant impacts on ecosystem functions and processes. Previous studies have indicated that N addition has an impact on the stoichiometry of plant leaf C:N:P ratios. However, few studies have focused on effects of N addition on belowground systems. This study aims to examine the impact of 7 years of N addition on above- and belowground C:N:P stoichiometry at plant community level in a temperate grassland located in Inner Mongolia. A 7-year field N addition experiment was conducted, which included six treatments: Cont: control; N1: 0.4 molm(-2) N; N2: 0.8 molm(-2) N; N3: 1.6 molm(-2) N; N4: 2.8 molm(-2) N; N5: 4 molm(-2) N with six replicates. Above- and belowground plant biomass and C:N:P stoichiometry were measured and analyzed. Our results showed that N addition resulted in a reduction of aboveground C concentration, but an increase in aboveground N and P concentrations, with a decrease in C:N and C:P ratios and an increase in N:P ratio. Furthermore, the aboveground C, N, and P pools all exhibited an increase as a result of N addition. However, N addition did not have any significant effect on belowground C, N, P concentrations, ratios, pools, or stoichiometric characteristics in the soil layers of 0-10, 10-30, 30-50, and 50-100 cm. These results suggest that increasing levels of N deposition significantly alter the aboveground C:N:P stoichiometry at the plant community level, which may affect functions and processes in the grassland ecosystem, but have little effect on belowground C:N:P stoichiometry.

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