| 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 |
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| 引用本文： | 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. |
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| 作者姓名： | 陈晓鹏 王根绪 孙菊英 张涛 毛天旭 |
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| 作者单位： | 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 |
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| 基金项目： | 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 |
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| 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。
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| 关 键 词： | 模拟增温 氮沉降 二氧化碳排放 高寒湿地 |
| 收稿时间： | 2019-10-12 |
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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| 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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| Authors: | CHEN Xiao-peng WANG Gen-xu SUN Ju-ying ZHANG Tao MAO Tian-xu |
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| Institution: | 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 |
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| 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. |
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| Keywords: | Simulated warming Nitrogen deposition CO 2 emission Alpine wetland |
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