人工开窗面积大小对柏木低效林土壤有机碳含量及碳库管理的影响  

Effect of Thinning Area with Gaps on Soil Organic Carbon Content and Carbon Pool Management Index in Low Efficiency Cypress Forest

作　　者：王谢[1] 李贤伟[1] 范川[1] 张军[1] 苏宇[1] 刘鸿[1] 李婷[1] 

机构地区：[1]四川农业大学林学院,四川雅安625014

出　　处：《水土保持学报》2014年第4期177-182,共6页Journal of Soil and Water Conservation

基　　金：国家"十二五"科技支撑计划项目(2011BAC09B05);四川省科技支撑计划项目(2010NZ0049)

摘　　要：基于对川中丘陵区柏木低效林人工开窗技术的探索,研究人工开窗面积大小对土壤中有机碳（SOC）、可溶性有机碳（DOC）、微生物生物量碳（MBC）、易氧化碳（ROC）、稳定性有机碳（IOC）、碳库活度（CPA）和碳库管理指数（CPMI）的影响,结果表明：（1）开窗处理可显著提高0-5cm,5-10cm和10-20cm土层的SOC、ROC和IOC含量。（2）当开窗面积在50∽100m2时,SOC和IOC从上到下都表现出明显的梯度性,当开窗面积达到150∽200m2时,5-10cm和10-20cm土层SOC和IOC的含量无显著差异。（3）0-5cm表层土壤的DOC含量随着开窗面积的增加而减少,但当开窗面积达到150∽200m2时,5-10cm和10-20cm土层土壤的DOC含量和对照无显著差异。（4）开窗面积大小对MBC无显著影响。（5）土层之间的CPA及活度指数（CPAI）存在显著差异,而开窗处理对CPA和CPAI的影响却并不明显。（6）开窗处理后土壤的CPMI皆表现为从上到下依次增加的趋势。（7）开窗后土壤碳库的增加主要反映在5-10cm土层,而土壤有机碳更新能力的显著提高主要反映在10-20cm土层。（8）SOC与IOC呈极显著正相关,而与MBC呈极显著负相关。（9）SOC、MBC和IOC与土壤碳库指数（CPI）均呈极显著相关关系。上述结果显示了人工开窗后表层土壤有机碳的稳定性和深层土壤有机碳的矿化趋势。Based on exploring the gap thinning technology of low efficiency stand of Cupressus funebris in Si- chuan hilly basin, differences of soil total organic carbon （SOC）, dissolved organic carbon （DOC）, microbial biomass carbon （MBC）, readily oxidizable carbon （ROC）, stable organic carbon （IOC）, carbon pool activity （CPA） and carbon pool management index （CPMI） among different thinning area with gaps were studied. The results showed that：（1）SOC, ROC and IOC of soil at 0--5 cm, 5--10 cm and 10--20 cm depths in- creased after gap thinning. （2）Although when thinning area was 50~100 m2, SOC and IOC gradually re- duced from top to bottom, when thinning area was 150--200 m2 , there was no significant difference of SOC and IOC of soils at 5--10 cm and 10--20 cm. （3）Ahhough DOC of soil at 0--5 cm depths reduced with in- creasing gap, when the area was 150~200 m2 , DOC of soils at 5--10 cm and 10--20 cm of treatment forests were not significant difference with control forest. （4）Thinning area with gaps had no significant effect on MBC. （5）CPA and CPAI（carbon pool activity index） were significant different among soil depths, but no significant differences among thinning areas with gaps. （6）Carbon pool management index of soils with dif- ferent gap thinning gradually increased from top to bottom. （7）Increase of carbon pool with gap thinning was reflected mainly in 5-- 10 cm soil layer, and the increase of renewability of soil organic carbon with gap thinning was reflected mainly in 10--20 cm soil layer. （8） SOC was significantly positive correlation with IOC, but it was significantly negative correlation with MBC. （9）Soil carbon pool index （CPI） was in highly significant correlation with SOC, MBC and IOC. These results suggested that the organic carbon of surface soil had some stability, and that of deep soil showed some trend of mineralization.

关 键 词：易氧化碳 碳库管理指数 低效林改造 人工开窗 有机质 

分 类 号：S157.5[农业科学—土壤学] S155.48[农业科学—农业基础科学]