华西雨屏区天然常绿阔叶林土壤呼吸对降雨减少的响应  

Effects of throughfall exclusion on soil respiration in natural evergreen broad-leaved forest in Rainy Area of Western China

作　　者：周世兴[1] 黄从德[1] 向元彬[1] 肖永翔 唐剑东[1] 韩博涵[1] 

机构地区：[1]四川农业大学林学院,成都611130

出　　处：《应用与环境生物学报》2016年第3期499-504,共6页Chinese Journal of Applied and Environmental Biology

基　　金：国家"十二五"科技支撑项目(2010BACO1A11);四川省"十二五"农作物育种攻关项目资助~~

摘　　要：在华西雨屏区天然常绿阔叶林中,通过野外原位试验,设置对照(CK)、减少降雨5%(W1)、减少降雨10%(W2)、减少降雨20%(W3)和减少降雨50%(W4)5个处理,采用LI-8100土壤碳通量分析系统(LI-COR Inc.,USA)测定土壤呼吸速率及其相应环境因子,并通过回归方程分析土壤呼吸速率与10 cm土壤温度和0-10 cm土壤水分间的关系,研究模拟减雨对华西雨屏区天然常绿阔叶林土壤呼吸的影响.结果表明:(1)W1处理对常绿阔叶林土壤呼吸无显著影响,W2处理显著促进了常绿阔叶林土壤呼吸,W3和W4处理显著抑制了常绿阔叶林土壤呼吸(P<0.05);(2)W1、W3和W4处理的年累计土壤呼吸分别比CK减少了3.03%、12.26%和26.67%,而W2处理比CK增加了11.17%;(3)W2处理使土壤呼吸的温度敏感性降低,而W1、W3和W4则提高了土壤呼吸的温度敏感性.综上所述,降雨减少显著影响了阔叶林土壤呼吸,改变了土壤呼吸的温度敏感性.(图4表1参28)An in situ experiment was conducted to detect the effects of throughfall exclusion on soil respiration in the evergreen broad-leaved forest in the Rainy Area of Western China. The experiment was carried out in November 2013 to November 2014 at Yucheng District of Ya＇an City, Sichuan Province. We set up 3 quadrates of 3 m × 3 m for each of the 5 treatments： control （no throughfall reduction, CK）, 5% throughfall reduction （W1）, 10% throughfall reduction （W2）, 20% throughfall reduction （W3）, and 50% throughfall reduction （W4）. We detected the dynamics of soil respiration rate and other environmental factors from January to November 2014. The observation of the year showed that： （1） W1 treatment had no significant effect on soil respiration of evergreen broad-leaved forest; W2 treatment increased thesoil respiration rate, while W3 and W4 treatments inhibited it significantly （P 〈 0.05）. （2） W1, W3 and W4 treatments had cumulative soil CO2 efflux rates 3.03%, 12.26% and 26.67%, respectively, lower than the CK, while W2 treatment had cumulative soil CO2 efflux rate 11.17% higher than CK. （3） W2 treatment could reduce thetemperaturesensitivity of soil respiration,while W1, W3 and W4treatments could increase it. In summary, throughfall exclusion significantly affected the soil respiration of broad-leaved forest, changing the temperature sensitivity of soil respiration.

关 键 词：减少降雨 土壤呼吸 常绿阔叶林 Q10值 土壤温度 土壤水分 

分 类 号：S718.5[农业科学—林学]