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Effect of rain enrichment on soil respiration of Nitraria sphaerocarpa community in a hyperarid area

查看全文 作　　者：DianJun [1,2]Liu;Bo [1]Wu;YongHua [1]Li;GuangHui [3]Lin;ShiPing [4]Chen;YaJuan [1]Zhu;Qi [1]Lu;Bin [1]Yao 高影响力作者 机构地区：[1]Institute of Desertification Studies, Key Laboratory of Tree Breading and Cultivation of State Forestry Administration,Chinese Academy of Forestry;[2]Inner Mongolia Hydraulic Research Institute;[3]Center for Earth System Science, Tsinghua University;[4]State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences高影响力机构 出　　处：《Research in Cold and Arid Regions》索引2013年第5卷第6期,共11页高影响力期刊 基　　金：supported by the key projects of the central public research institutes for basic research funds(CAFYBB2007008);Forestry public sector specific research(201104077) 摘　　要：In order to analyze the effect of rain enrichment on soil respiration rate of a Nitraria sphaerocarpa community,we measured soil respiration rate in bare and vegetated areas in a hyperarid area(Dunhuang)during the growing season.Results show that rain enrichment can increase bare and vegetated soil respiration rates.The more rainfall enrichment,the greater the increment and the longer duration time effect for soil respiration rate.200%(16 mm)and 300%(24 mm)of rain enrichment can significantly increase bare soil respiration rates by 90%and 106%(P<0.01),respectively.By contrast,areas with 100%(8 mm),200%(16 mm)and 300%(24 mm)of rain enrichment can significantly increase shrub area respiration rates by 68%,157%and 205%(P<0.01),respectively.The response time of bare and vegetated soil respiration to rainfall enrichment is asynchronous.Response variable of soil respiration in vegetated soil is higher(118%)than in bare soil.There was significant positive correlation between soil respiration rate and soil water content during the growing season(P<0.01).For every 1 mm increment of precipitation,soil respiration rate increased by 0.01 and 0.04μmol/(m2·s),respectively in vegetated and bare soils. 关 键 词：土壤呼吸速率 富集 雨水 群落 白刺 生长季节 正相关关系 土壤含水量
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