文献类型：期刊文献

中文题名：极端干旱对若尔盖高原泥炭地生态系统CO_2通量的影响

英文题名：Effects of extreme drought on CO_2 fluxes of Zoige alpine peatland

作者：张远[1] 郝彦宾[1] 崔丽娟[2,3] 李伟[2,3] 张骁栋[2,3] 张曼胤[2,3] 李林峰[1] 杨思[2,3] 康晓明[2,3]

第一作者：张远

机构：[1]中国科学院大学生命科学学院;[2]中国林业科学研究院湿地研究所湿地生态功能与恢复北京市重点实验室;[3]四川若尔盖高寒湿地生态系统定位观测研究站

年份：2017

卷号：34

期号：4

起止页码：462-470

中文期刊名：中国科学院大学学报

外文期刊名：Journal of University of Chinese Academy of Sciences

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：中国林业科学研究院林业新技术研究所基本科研业务费专项(CAFINT2014K06);国家重点研发计划项目(2016YFC0501804);国家自然科学基金(31300417);中央级公益性科研院所基本科研业务费专项(CAFYBB2014QB026)资助

语种：中文

中文关键词：极端干旱;泥炭地;碳通量;温度;土壤含水量

外文关键词：extreme drought; peatland ; carbon fluxes; temperature ; soil water content

分类号：Q14

摘要：采用野外控制试验和静态箱法,研究极端干旱事件对若尔盖高原泥炭地净生态系统二氧化碳交换(net ecosystem CO_2 exchange,NEE)、生态系统呼吸(ecosystem respiration,R_e)和总初级生产力(gross primary productivity,GPP)的影响及其响应机制。研究结果表明:极端干旱显著降低若尔盖高原泥炭地生态系统的NEE、R_e和GPP(P<0.05),导致生态系统固碳能力减弱,而温度(空气温度和土壤温度)和土壤含水量(SWC)是若尔盖高原泥炭地碳收支变化的主要驱动因子。在对照处理(CK)和极端干旱处理(D)中,NEE、R_e和GPP与空气温度呈显著正相关关系(P<0.05),极端干旱减弱NEE、R_e和GPP对空气温度变化的敏感性。表层土壤温度与NEE、R_e和GPP的相关性高于深层土壤温度与NEE、R_e和GPP的相关性。分析5 cm土壤温度与NEE和R_e的相关关系。极端干旱减弱NEE对5 cm土壤温度的敏感性,增强R_e对5cm土壤温度的敏感性。若尔盖高原泥炭地生态系统NEE、R_e和GPP与土壤含水量显著正相关(P<0.05),而极端干旱对土壤全碳、全氮和有机碳的含量无显著影响(P>0.05)。
To study the effects of extreme drought on net ecosystem CO2 exchange （NEE）, ecosystem respiration （Ro）, and gross primary productivity （GPP） of Zoige alpine peatland, the carbon fluxes in both extreme drought treatment （D） and control treatment （CK） were monitored by using static enclosed chamber technique in a control platform of extreme climate event. The results showed that extreme drought significantly decreased NEE, Re, and GPP （P 〈 0. 05 ） of Zoige alpine peatland and hence reduced the carbon fixation capacity of targeted ecosystem. We also found that temperatures （ air temperature （ Ta） and soil temperature （ Ta） ） and soil water content （SWC） were the main driving factors of carbon budget dynamics in Zoige alpine peatland. NEE, Ro, and GPP were significantly positively correlated with air temperature （P 〈 0. 05 ）, and their sensitivity to the Ta change was weakened by extreme drought. The correlations of NEE, Re, and GPP with topsoil temperature were much stronger than those with subsoil temperature. Besides, we found that extreme drought reduced the sensitivity of NEE to soil temperature at depth of 5 cm, but strengthened the sensitivity of Re. Furthermore, NEE, Re, and GPP were significantly positively correlated with soil water content （P 〈 0.05 ）. However, extreme drought had no significant effect on soil total carbon, nitrogen, and soil organic carbon contents （P 〉 0. 05）.