Land Use Effects on Soil Organic Carbon, Microbial Biomass and Microbial Activity in Changbai Mountains of Northeast China

作     者：FANG Xiangmin WANG Qingli ZHOU Wangming ZHAO Wei WEI Yawei NIU Lijun DAI Limin 

作者机构：State Key Laboratory of Forest and Soil EcologyInstitute of Applied EcologyChinese Academy of Sciences University of Chinese Academy of Sciences Changbai Mountains Academy of Sciences 

出 版 物：《Chinese Geographical Science》 (中国地理科学（英文版）)

年 卷 期：2014年第24卷第3期

页      面：297-306页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：Under the auspices of National Key Technology Research and Development Program of China(No.2012BAD22B04) CFERN&GENE Award Funds on Ecological Paper National Natural Science Foundation of China(No.30900208) 

主　　题：land use soil organic carbon (SOC) microbial biomass carbon (MBC) carbon mineralization basal respiration ChangbaiMountains 

摘      要：Land use changes are known to alter soil organic carbon （SOC） and microbial properties, however, information about how conversion of natural forest to agricultural land use as well as plantations affects SOC and microbial properties in the Changbai Moun- tains of Northeast China is meager. Soil carbon content, microbial biomass carbon （MBC）, basal respiration and soil carbon mineraliza- tion were studied in five selected types of land use： natural old-growth broad-leaved Korean pine mixed forest （NF）; spruce plantation （SP） established following clear-cutting of NF; cropland （CL）; ginseng farmland （GF） previously under NF; and a five-year Mongolian oak young forest （YF） reforested on an abandoned GF, in the Changbai Mountains of Northeast China in 2011. Results showed that SOC content was significantly lower in SP, CL, GF, and YF than in NF. MBC ranged from 304.4 mg/kg in CL to 1350.3 mg/kg in NF, which was significantly higher in the soil of NF than any soil of the other four land use types. The SOC and MBC contents were higher in SP soil than in CL, GF, and YF soils, yielding a significant difference between SP and CL. The value of basal respiration was also higher in NF than in SP, CL, GF, and YF. Simultaneously, higher values of the metabolic quotient were detected in CL, GF, and YF soils, indicat- ing low substrate utilization of the soil microbial community compared with that in NF and SP soil. The values of cumulative mineral- ized carbon and potentially mineralized carbon （Co） in NF were significantly higher than those in CL and GF, while no significant dif- ference was observed between NF and SP. In addition, YF had higher values of Co and C mineralization rate compared with GF. The results indicate that conversion from NF into agricultural land （CL and GF） uses and plantation may lead to a reduction in soil nutrients （SOC and MBC） and substrate utilization efficiency of the microbial community. By contrast, soils below SP were more conducive to the preserv