林分改造初期整地行为对土壤有机碳、氮和微生物量碳氮及土壤碳库管理指数的影响  

Effect of Site Preparation Behavior on Soil Organic Carbon and Nitrogen, Microbial Biomass Carbon and Nitrogen,and Carbon Pool Management Index in Early Forest Stand Transformation

作　　者：王谢[1] 李贤伟[1] 范川[1] 周义贵[1] 杨育林[1] 刘运科[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》2013年第6期193-198,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块状混交改造技术的探索，研究林分改造初期整地行为对土壤有机碳（SOC）、全氮（TN）、微生物生物量碳氮（MBC＆MBN）、易氧化碳（ROC）、稳定性有机碳（IOC）和碳库管理指数（CPMI）的影响。结果表明：（1）整地面积越大，土壤表层0—5cm的SOC含量越低，当整地面积达到150～200m。时，整地行为对土壤SOC的干扰可以达到20-40cm土层。（2）整地行为对土壤TN的干扰主要集中在0—5cm，受干扰土壤0—5cm土层的TN含量仅为对照林A的2／3。（3）整地行为改变了土壤垂直方向上土壤碳氮的分配格局，当整地面积大于100m。时，5—20cm土层的土壤C／N同0—5cm土层没有显著差异，而20-40cm土层的土壤C／N随着整地面积的增加逐渐增加。（4）整地干扰对于林分MBC的影响主要集中在0—5cm土层，对20-40cm土层的影响不明显。（5）整地行为显著提高表层0—5cm和5—20cm土层土壤MBN含量，而当整地面积大于50m。时，深层20-40cm土层土壤MBN轻微表现出降低的趋势。（6）整地干扰导致土壤MBN含量表现出随土层增加而降低的特征。（7）整地干扰对0—5cm，5—20cm和20～40cm土层土壤ROC含量皆有显著影响，但各种干扰处理强度间的规律性不强。（8）当整地面积大于150m。时，整地干扰对5—20cm土层土壤IOC含量影响较大，且表现出从上到下逐渐降低的规律。（9）处理间CPMI的差异表明整地干扰在一定程度上增加土壤ROC含量，降低土壤有机碳的稳定性，促进土壤有机碳的更新。Based on exploring the massive mixed transformation technology of low efficiency stand of Cupres- sus funebris in Sichuan hilly basin, differences of soil organic carbon （SOC）, total nitrogen （TN）, microbial biomass carbon and nitrogen （MBC ＆ MBN）, readily oxidizable carbon （ROC）, stable organic carbon （IOC） and carbon pool management index （CPMI） among different human disturbance at early period of reconstruc- tion were studied. The results showed that： （1）The greater the site preparation area, the lower SOC content in 0--5 cm soil layer. Effect o{ site preparation behavior on SOC content reached 20--40 cm soil layer when site preparation area was 150~200 m2. （2）Effects of site preparation behavior on soil TN content mainly concentrated in 0--5 cm soil layer and its content was only 2/3 of control forest. （3）Site preparation behavior changed vertical distribution of soil carbon and nitrogen, when area was larger than 100 m2 , there was no significant difference of soil C/N between 0--5 cm and 5--20 cm soil layer, and soil C/N in 20--40 cm soil layer increased with increase of soil preparation area. （4） Effects of soil preparation behavior on soil MBC mainly concentrated in 0--5 cm soil layer, and the influence was not obvious on 20--40 cm soil layer. （5）Site preparation behavior significantly increased soil MBN content in 0--5 cm and 5--20 cm soil layer, soil MBN content in 20--40 cm soil layer slightly showed a reduced tendency when soil preparation area was more than50 m2. （6）Site preparation caused soil MBN content showed the characteristics of that decreasing with in- creasing soil depth. （7）Although soil preparation behavior significantly affected soil ROC content in 0--5, 5 --20 and 20--40 cm soil layer, the regularity among treatments was not obvious. （8）When site preparation area was larger than 150 m2 , the interference on soil IOC content in 5--20 cm soil layer was significant, and a gradually reduce from top to bottom was showed. （9）Diffe

关 键 词：有机碳 氮 微生物量碳氮 碳库管理指数 低效林改造 整地 

分 类 号：S153.62[农业科学—土壤学] S154.3[农业科学—农业基础科学]