长白山原始红松林次生演替过程中土壤微生物生物量和酶活性变化  

Temporal variations of soil microbial biomass and enzyme activities during the secondary succession of primary broadleaved-Pinuskoraiensis forests in Changbai Mountains of Northeast China

作　　者：胡嵩[1,2] 张颖[1] 史荣久[1] 韩斯琴[1] 李慧[1] 徐慧[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院大学,北京100049

出　　处：《应用生态学报》2013年第2期366-372,共7页Chinese Journal of Applied Ecology

基　　金：国家重点基础研究发展计划项目(2011CB403205)资助

摘　　要：采用空间代替时间的方法,以我国东北地区温带森林长白山原始阔叶红松林成熟林(200年)和过熟林(>200年)及其次生演替不同阶段——白桦幼龄林(20年)、白桦中幼龄林(30年)、白桦中龄林(50年)、白桦成熟林(80年)和白桦过熟林(100年)为研究对象,分析了长白山原始阔叶红松林次生演替过程中土壤有机碳、土壤微生物生物量碳、氮、磷及土壤酶活性变化.结果表明:白桦幼龄林和白桦成熟林的土壤腐殖质层(A层)有机碳含量最高,分别为154.8和154.3g·kg-1,而顶极群落原始阔叶红松林A层有机碳含量相对较低,成熟林和过熟林分别为141.8和133.4g·kg-1.白桦中龄林和白桦成熟林的微生物生物量碳和微生物熵均高于其他林地,纤维素酶、过氧化物酶、酸性磷酸酶和纤维二糖酶的活性到中龄林和成熟林达到最高,而此阶段的多酚氧化酶活性最低,提示白桦中龄林及白桦成熟林土壤有机碳周转速度快,土壤有机碳可能处于较强的积累过程中.统计分析表明,土壤微生物生物量碳与土壤有机碳、全氮和有效磷含量之间呈极显著正相关(r分别为0.943、0.963和0.953,P<0.01).By the method of space-for-time substitution,and taking the matured（200 years old） and over-matured（200 years old） primary broadleaved-Pinus koraiensis forests and their secondary forests at different succession stages（20-,30-,50-,80-,and 100 years old Betula platphylla forests） in Changbai Mountains of Northeast China as test objects,this paper studied the temporal variations of soil organic carbon,soil microbial biomass,and soil enzyme activities during the secondary succession of primary broadleaved-Pinus koraiensis forests in the Mountains.Under the 20-and 80 years old B.platphylla forests,the soil organic carbon content in humus layer was the highest（154.8 and 154.3 g·kg-1,respectively）;while under the matured and over-matured primary broadleaved-Pinus koraiensis forests,this organic carbon content was relatively low,being 141.8 and 133.4 g·kg-1,respectively.The soil microbial biomass carbon and microbial quotient and the activities of soil cellulase,peroxidase,acid phosphatase,and cellobiase under the 50-and 80 years old B.platphylla forests were the highest,but the activity of soil polyphenol oxidase was the lowest,which revealed that under middle-aged and matured B.platphylla forests,soil organic carbon had a faster turnover rate,and was probably in a stronger accumulation phase.Statistical analysis showed that the soil microbial biomass carbon had significant positive correlations with the soil organic carbon,total nitrogen,and available phosphorus（r=0.943,0.963,and 0.953,respectively;P0.01）.

关 键 词：长白山 次生演替 土壤微生物生物量 土壤酶活性 

分 类 号：S714[农业科学—林学]