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当前位置: 首页 > 文章 > 水热因子对克氏针茅草原土壤呼吸及其土壤温度敏感性的影响 草业学报 2015,24 (4) 21-29
Position: Home > Articles > The influence of hydrothermal factors on soil respiration and soil temperature sensitivity of Stipa krylovii steppe,Inner Mongolia,China Acta Prataculturae Sinica 2015,24 (4) 21-29

水热因子对克氏针茅草原土壤呼吸及其土壤温度敏感性的影响

作  者：
谷蕊;潮洛濛;张立欣;苏力德;万志强;闫玉龙;陈雅丽;高清竹
单  位：
中国农业科学院农业环境与可持续发展研究所;内蒙古大学生命科学学院
关键词：
克氏针茅草原;土壤呼吸;温度;土壤理化性质;土壤微生物
摘  要：
作为内蒙古重要的草地资源,克氏针茅草原在我国畜牧业生产中占有重要的地位。土壤呼吸是大气与陆地生态系统碳循环的主要通量,是土壤碳输出的主要途径。试验区设置在内蒙古锡林浩特市东部毛登牧场内以克氏针茅建群的典型草原;在2011-2013年采用开顶式生长室(OTC)对试验样地进行模拟增温增雨处理,在生长季(5-9月份)使用开路式土壤碳通量测量系统(LI-8100,LI-COR,NE)对试验样地土壤呼吸强度进行测定;同时监测试验样地气温、土壤温湿度等环境因子,采集土壤样品并室内分析土壤养分特征和微生物生物量,并对土壤呼吸与环境因子间进行相关性分析。克氏针茅草原土壤呼吸受空气温度和土壤含水量影响显著(P<0.05),分别呈现出二项函数和线性相关关系;不同处理下土壤呼吸在相同时间存在显著差异(P<0.05),2012年增温增雨与增温处理下土壤呼吸速率分别为2.60和1.96μmol/(m2·s),2013年增温增雨与增温处理下土壤呼吸速率分别为3.38和2.09μmol/(m2·s);增温增雨处理下,克氏针茅草原空气温度的升高和土壤含水量的降低均对土壤呼吸产生了抑制。土壤呼吸温度敏感度(Q10)在2011-2012年中增温增雨处理明显高于对照处理和控温处理;2011-2013年控温处理都低于对照处理。本研究表明,土壤呼吸主要受水热条件影响,并且空气温度升高和土壤含水量的降低均对土壤呼吸有抑制作用,增温增雨处理下土壤呼吸速率要高于增温处理;土壤呼吸温度敏感系数与土壤温度、土壤含水量、土壤有机碳、全氮和微生物等环境因子之间的关系较为复杂,还有待深入研究。
译  名：
The influence of hydrothermal factors on soil respiration and soil temperature sensitivity of Stipa krylovii steppe,Inner Mongolia,China
作  者：
GU Rui;CHAO Luo-Meng;ZHANG Li-Xin;SU Li-De;WAN Zhi-Qiang;YAN Yu-Long;CHEN Ya-Li;GAO Qing-Zhu;School of Life Sciences,Inner Mongolia University;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Key Laboratory for Agro-Environment & Climate Change of Ministry of Agriculture;
关键词：
Stipa krylovii steppe;;soil respiration;;temperature;;soil organic carbon and nitrogen;;soil microorganisms
摘  要：
The grasslands of the Inner Mongolian Stipa krylovii steppe make an important contribution to animal production in China.Soil respiration is an important component of the carbon cycle on the steppe and the main source of soil carbon losses.In this study,typical grassland dominated by S.krylovii,located in Maodeng Ranch,Xilinhaote,Inner Mongolia was selected as the study area.An open top type growth chamber was used to simulate the response of soil respiration to temperature and precipitation from 2011 to 2013.The Automated Soil CO2 Flux System(LI-8100,LI-COR,NE)was used to observe the soil respiration in the study area during the growing season(May to September).Air temperature,soil temperature and soil moisture were measured using the EM50 Data Collection System(Decagon Devices,Inc.,NE,USA).Soil samples were collected,soil nutrients and microbial numbers were determined and correlation analysis used to explore associations between soil respiration rate and environmental factors.Soil respiration was significantly affected by air temperature and soil water content(P<0.01).Under warm and warm-moist conditions respectively soil respiration rates were 2.60μmol/(m2·s)and 1.96μmol/(m2·s)(2012)and 3.38μmol/(m2·s)and 2.09μmol/(m2·s)(2013);differences between years were significant(P<0.05).Increased air temperature and decreased soil water content both inhibited soil respiration.During the 2013 growing season additional environmental factors including soil organic carbon,total nitrogen and soil microbial mass may also have affected soil respiration.The Q10 temperature coefficient was significantly increased by warm-moist conditions.It was concluded that soil respiration is mainly influenced by hydrothermal conditions;increased air temperature and reduced soil moisture content inhibit soil respiration.The relationship between environment factors and soil respiration on the Inner Mongolian steppe is complex and requires further research.

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