氮添加对内蒙古草原植物地上和地下碳氮磷化学计量学特征的影响

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

Ziqi Wang ¹Jie Wang ²Honghui Wu ³Tian Yang ⁴Yixin An ¹Yunlong Zhang ⁵Jianlin Bian ⁶Ying Li ¹Haiyan Ren ⁷Ariuntsetseg Lkhagva ⁸Xu Wang ²Qiang Yu¹

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作者信息

1. School of Grassland Science,Beijing Forestry University,Beijing 100083,China
2. National Hulunber Grassland Ecosystem Observation and Research Station,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China
3. Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China
4. Department of Biology,University of Western Ontario,London,ON,Canada
5. College of Grassland Science and Technology,China Agricultural University,Beijing 100083,China
6. College of Resource Environment and Tourism,Capital Normal University,Beijing 100048,China
7. College of Agro-grassland Science,Nanjing Agricultural University,Nanjing 210095,China
8. Department of Biology,School of Arts and Sciences,National University of Mongolia,Ulaanbaatar 14200,Mongolia
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摘要

氮沉降对生态系统功能和过程具有显著影响.已有研究表明氮添加会影响植物叶片C∶N∶P化学计量特征.然而,氮添加对植物根系C∶N∶P化学计量特征影响的研究罕有报道.本论文的主要目的是对比氮添加对草原植物群落地上和地下C∶N∶P化学计量特征的影响.我们在内蒙古锡林郭勒草原开展了一个7年的氮添加实验,该实验包括6个处理,分别是对照:control;N1:0.4 mol·m-2 N;N2:0.8 mol·m-2 N;N3:1.6 mol·m-2 N;N4:2.8 mol·m-2 N;N5:4 mol·m-2 N,每个处理6次重复.我们测量并分析了植物地上、地下生物量和C∶N∶P化学计量特征.研究结果表明,氮添加会导致植物群落地上部分碳浓度降低,氮浓度和磷浓度升高,C∶N和C∶P比值降低,N:P升高,而且地上碳、氮、磷库均因施氮而增加.然而,氮添加对0-10,10-30,30-50和50-100 cm 4个土层的地下部分碳、氮、磷浓度、比例、库和化学计量特征没有显著影响.综上所述,氮添加会显著改变植物群落地上部分C∶N∶P化学计量特征,进而影响草地生态系统的功能和过程,但对地下C∶N∶P化学计量特征几乎没有影响.

Abstract

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 mol·m-2 N;N2:0.8 mol·m-2 N;N3:1.6 mol·m-2 N;N4:2.8 mol·m-2 N;N5:4 mol·m-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.

关键词

氮沉降/C∶N∶P化学计量/草地生态系统/群落/地下

Key words

nitrogen deposition/C∶N∶P stoichiometry/grassland ecosystem/community level/belowground

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基金项目

国家自然科学基金()

出版年

2024

植物生态学报(英文版)

CSCD

ISSN：1752-9921

参考文献量59

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