青藏高原东缘亚高山针叶林人工恢复过程中的土壤呼吸特征  

Characteristics of soil respiration in artificial restoration process of subalpine coniferous forest in eastern Qinghai-Tibet plateau

作　　者：周非飞[1,2] 林波[1] 刘庆[1] 

机构地区：[1]中国科学院成都生物研究所,成都610041 [2]中国科学院研究生院,北京100039

出　　处：《应用生态学报》2009年第8期1783-1790,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30800161);国家自然科学基金重点项目(30530630);中国科学院成都生物研究所知识创新工程领域前沿项目(CIB-2007-LYQY-Q03);"西部之光"人才计划"西部博士项目";中国科学院知识创新工程"西部行动计划"项目(KZCX2-XB2-02)资助

摘　　要：采用动态密闭气室红外CO2分析法,对青藏高原东缘云杉人工林的土壤呼吸进行连续定位测定,并用挖壕沟法区分土壤自养呼吸和异养呼吸.结果表明:4种云杉林的土壤呼吸速率与土壤5cm层温度有显著的正指数关系,与土壤含水量的相关性不显著.4种云杉林土壤呼吸年通量在792.08～1070.20gC.m-2.a-1,大小依次为:天然云杉林>22年生云杉人工林>65年生云杉人工林>35年生云杉人工林,随着人工林的恢复呈先降低后升高的趋势.在森林恢复过程中,人工云杉土壤自养和异养呼吸年通量均先减少后增加,在253.36～357.05gC.m-2.a-1和538.69～703.82gC.m-2.a-1范围变化.22年生、35年生、65年生云杉人工林和天然云杉林非生长季(2007-11—2008-03)和生长季(2008-04—2008-10)的Q10值分别为:4.59、6.54、4.77、3.18和4.17、4.66、3.11、2.74.除22年生云杉人工林,Q10值随云杉林的恢复更新而逐渐降低,且非生长季节Q值均明显高于生长季节.By the method of infrared CO2 determination in closed dynamic chamber system, the soil respiration in natural spruce forest, and 22-, 35-and 65-year old spruce plantations in eastern Qinghai-Tibet plateau was measured in situ, and the soil heterotrophic and autotrophic respiration was differentiated by entrenchment. In the four spruce forests, soil respiration rate had a significant pos- itive exponential correlation with the soil temperature at depth 5 era, but less correlation with the soil moisture content at the same depth. The annual soil respiration flux was 792.08-1070. 20 g C · m^-2 · a^-1 , and decreased in the order of natural spruce forest 〉 22-year old spruce plantation 〉 65-year old spruce plantation 〉 35-year old spruce plantation. The annual soil autotrophic and heterotrophic respiration fluxes were 253.36-357. 05 g C · m^-2 · a^-1 and 538.69-703.82 g C · m^-2 · a^-1 , respectively, and had the same variation trend as the annual soil respiration flux. The Q10 value of soil respiration in 22-, 35-, and 65-year old spruce plantations and in natural spruce forest in growth season （from Nov. 2007 to Mar. 2008 ） and non-growth season （from Apr. 2008 to Oct. 2008） were 4. 59, 6.54, 4. 77, and 3.18, and 4. 17, 4.66, 3.11, and 2. 74, respectively. Except that in 22-year old spruce plantation, the Q10 value was decreased with increasing restoration year, and was obviously higher in non-growth season than in growth season.

关 键 词：云杉林 土壤呼吸 土壤自养呼吸 土壤异养呼吸 

分 类 号：S714[农业科学—林学]