增温和氮添加对长江源区高寒沼泽草甸生态系统呼吸的影响

doi:10.11733/j.issn.1007-0435.2020.01.022

草地学报 ›› 2020, Vol. 28 ›› Issue (1): 193-199.DOI: 10.11733/j.issn.1007-0435.2020.01.022

增温和氮添加对长江源区高寒沼泽草甸生态系统呼吸的影响

陈晓鹏^1,2, 王根绪², 孙菊英², 张涛³, 毛天旭³

1. 山西农业大学, 山西太谷 030801;
2. 中国科学院水利部成都山地灾害与环境研究所, 四川成都 610041;
3. 贵州大学, 贵州贵阳 550025

收稿日期:2019-10-12 修回日期:2019-11-27 出版日期:2020-02-15 发布日期:2020-01-18
通讯作者: 王根绪
作者简介:陈晓鹏(1986-),男,山西晋中人,博士,讲师,主要从事草地生态系统生态学研究,E-mail:chenxp_sxau@163.com
基金资助:
中科院成都山地所山地表生过程与生态调控重点实验室；国家自然科学基金（31800402）；山西省优秀博士来晋工作奖励资金科研项目（SXYBKY201806）资助

Effects of Warming and N Fertilization on Ecosystem Respiration of an Alpine Swamp Meadow in the Source Area of the Yangtze River

CHEN Xiao-peng^1,2, WANG Gen-xu², SUN Ju-ying², ZHANG Tao³, MAO Tian-xu³

1. Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan Province 610041, China;
3. Guizhou University, Guiyang, Guizhou Province 550025, China

Received:2019-10-12 Revised:2019-11-27 Online:2020-02-15 Published:2020-01-18

摘要/Abstract

摘要： 为探究高寒湿地生态系统对气候变化的响应，本研究对模拟增温（2.64℃）、氮添加（40 kg N·ha^-2·yr^-1）及其交互处理下的高寒沼泽草甸生态系统呼吸进行了2个生长季的监测。结果表明：增温显著提高了高寒沼泽草甸生态系统呼吸（约25%），而氮添加对高寒沼泽草甸生态系统呼吸无显著影响；增温降低了高寒沼泽草甸生态系统呼吸对土壤温度变化的敏感性。在相对温暖的2015年生长季，增温和氮添加对生态系统呼吸起到协同促进作用。分析发现高寒沼泽草甸生态系统呼吸主要受表层土壤温度、植物生物量和土壤可溶性有机碳的影响；增温显著提高了植物地上和地下生物量，增强了自养呼吸，是增温提高生态系统呼吸的主要原因。本研究结果表明相比于大气氮沉降增加，高寒沼泽草甸生态系统呼吸对气候变暖的响应更加敏感。

关键词: 模拟增温, 氮沉降, 二氧化碳排放, 高寒湿地

Abstract: To improve human understanding of the response of alpine wetlands to future climate change,we investigated the effect of artificial warming (2.64℃ soil warming),nitrogen (N) fertilization (40 kg N·ha^-2·a^-1) and their interaction on the ecosystem respiration (ER) of an alpine swamp meadow of the Qinghai-Tibet Plateau in 2014 and 2015. The results were as follows:(i) warming increased the ER of the alpine swamp meadow by 25.21%;N fertilization had no significant effect on the ER of the alpine swamp meadow;and the interaction between warming and N fertilization increased ER in warm growing season;(ii) warming decreased the soil temperature sensitivity of the ER of the alpine swamp meadow;(iii) the ER of the alpine swamp meadow were mainly controlled by four factors,soil temperature at a depth of 5 cm,soil dissolved organic carbon (DOC) content,above ground biomass (AGB) and below ground biomass (BGB). And warming promoted autotrophic respiration by increasing AGB and BGB is the main reason for increased ER. These results suggested that the gaseous C loss of alpine wetland was more sensitive to climate warming rather than increasing N deposition.

Key words: Simulated warming, Nitrogen deposition, CO₂ emission, Alpine wetland

中图分类号:

Q148

陈晓鹏, 王根绪, 孙菊英, 张涛, 毛天旭. 增温和氮添加对长江源区高寒沼泽草甸生态系统呼吸的影响[J]. 草地学报, 2020, 28(1): 193-199.

CHEN Xiao-peng, WANG Gen-xu, SUN Ju-ying, ZHANG Tao, MAO Tian-xu. Effects of Warming and N Fertilization on Ecosystem Respiration of an Alpine Swamp Meadow in the Source Area of the Yangtze River[J]. Acta Agrestia Sinica, 2020, 28(1): 193-199.

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增温和氮添加对长江源区高寒沼泽草甸生态系统呼吸的影响

Effects of Warming and N Fertilization on Ecosystem Respiration of an Alpine Swamp Meadow in the Source Area of the Yangtze River

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