三峡库区兰陵溪小流域3种林分类型土壤呼吸特征  

Characteristics of Soil Respiration in Three Types of Stands in Lanlingxi Small Watershed in Three Gorges Reservoir Area

作　　者：韩海燕[1] 张涛 王鹏程[3] 雷静品[4] 曾立雄[5] 黄志霖[5] 肖文发[5] 

机构地区：[1]中国林业科学研究院荒漠化研究所,北京100091 [2]恩施自治州林业调查规划设计院,恩施445000 [3]华中农业大学园艺林学学院,武汉430070 [4]中国林业科学研究院林业研究所,北京100091 [5]中国林业科学研究院森林生态环境与保护研究所,北京100091

出　　处：《林业科学》2014年第11期182-187,共6页Scientia Silvae Sinicae

基　　金：国家"十二五"科技支撑项目"长江流域防护林体系整体优化及调控技术研究"(2011BAD38B04);林业公益性行业科研专项"典型森林土壤碳储量分布格局及变化规律研究"(201104008)

摘　　要：森林生态系统作为陆地生态系统的主体，其土壤碳库约占全球碳库的73％（Post et a1．，1982），森林土壤呼吸各组分的微小变化都会对大气CO2浓度产生显著影响，进而影响全球气候变化（Rustad et a1．，2000；Schlesinger et a1．，2000）。土壤呼吸即土壤表面的CO：通量，主要由自养呼吸（根呼吸）和异养呼吸（动物微生物呼吸、土壤有机物及凋落物分解等）组成（Shi et a1．，2012，韩天丰等，2011）。In this study, the trenching method and infrared gas exchange analyzer were used to research the characteristics of soil respiration in 3 different types of stands including coniferous forest,broad-leaved forest and conifer-broadleaved forest in Lanlingxi small watershed in Three Gorges Reservoir Area of China. The results indicated that the annual total soil respiration （ R total ） ,root respiration （ R root ） ,aboveground litter decomposition （ R lit er ） and soil organic matter （SOM） decomposition （RSOM） of coniferous forest were 1. 61,0. 47,0. 38,0. 76 μmol· m ^-2 s^ -1,respectively. The annual Rtotal,Rroot,Rliter andRSOMwere 1.47,0.35,0.16,0.96 μmol·m ^-2 s^ -1 for broad-leaved forest and 2.04,0.76, 0. 48,0. 80 μmol·m ^-2 s^ -1 for conifer-broadleaved forest,respectively. The respiration rates of soil and its components displayed obvious seasonal dynamics with maximum rate in summer and minimum rate in winter. Soil temperature was the main factor that affected soil and its components respiration rates, and there were significant positive exponential relationships between them （P〈0.05）. The annual Q10of Rtotal,Rroot,Rliter and RSOMwere 2.01,1.52,2.73 and 3.03 for coniferous forest,2. 51,1. 42,3. 46,3. 08 for broad-leaved forest and 1. 86,1. 14,3. 00,2. 32 for conifer-broadleaved forest,respectively. These results suggested that the annual Q10 value of Rroot in the three types of stands was significantly lower than that of the total soil respiration and its other components respiration （ P〈0 . 05 ） .

关 键 词：土壤呼吸 根呼吸 凋落物分解 土壤有机质分解 温度敏感性 

分 类 号：S718.55[农业科学—林学]