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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

作者： Wang, Ziqi 1 ; Wang, Jie 2 ; Wu, Honghui 3 ; Yang, Tian 4 ; An, Yixin 1 ; Zhang, Yunlong 5 ; Bian, Jianlin 6 ; Li, Ying 1 ; Ren, Haiyan 7 ; Lkhagva, Ariuntsetseg 8 ; Wang, Xu 2 ; Yu, Qiang 1 ;

作者机构： 1.Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res Stn, Beijing 100081, Peoples R China

3.Chinese Acad Agr Sci, Minist Agr, Inst Agr Resources & Reg Planning, Key Lab Crop Nutr & Fertilizat, Beijing 100081, Peoples R China

4.Univ Western Ontario, Dept Biol, London, ON, Canada

5.China Agr Univ, Coll Grassland Sci & Technol, Beijing 100083, Peoples R China

6.Capital Normal Univ, Coll Resource Environm & Tourism, Beijing 100048, Peoples R China

7.Nanjing Agr Univ, Coll Agrograssland Sci, Nanjing 210095, Peoples R China

8.Natl Univ Mongolia, Sch Arts & Sci, Dept Biol, Ulaanbaatar 14200, Mongolia

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

页码：

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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