Effects of land use type on soil organic carbon, total nitrogen, and microbial biomass carbon and nitrogen contents in Karst region of South China

Chinese Journal of Applied Ecology

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Effects of land use type on soil organic carbon, total nitrogen, and microbial biomass carbon and nitrogen contents in Karst region of South China

LI Xinai^1,2; XIAO Heai¹; WU Jinshui¹; SU Yirong^1,3; HUANG Daoyou¹; HUANG Min¹; LIU Shoulong¹; PENG Hongcui^1,2

¹Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;²Graduate University of Chinese Academy of Sciences,Beijing 100039, China;³Huanjiang Experiment Station of Karst Agricultural Ecosystem, Chinese Academy of Sciences, Huanjiang 547100, China

Received:2005-09-30 Revised:2006-07-24 Online:2006-10-18 Published:2006-10-18

Abstract

Abstract: A total of 721 surface (0～20 cm) soil samples were collected from the paddy field, upland, and woodland in the Karst region of Dacai, Huanjiang County, Guangxi Province, and the contents of their organic carbon (O_C), total nitrogen (TN), microbial biomass carbon (B_C), and microbial biomass nitrogen (B_N) were determined. The results showed that the O_C and B_N contents and soil pH value showed the trend of paddy field=woodland＞upland, while TN and B_C contents had the trend of woodland＞paddy field＞upland. There was a significant positive correlation between B_C and O_C, and between B_N and TN. Soil microbial biomass C and N had rapid responses to the changes of land use type, which could be used as the sensitive biological indicators in evaluating soil quality and fertility in Karst region.

Key words: Regional agro-ecosystem, Environmental quality, Assessment

LI Xinai^1,2; XIAO Heai¹; WU Jinshui¹; SU Yirong^1,3; HUANG Daoyou¹; HUANG Min¹; LIU Shoulong¹; PENG Hongcui^1,2. Effects of land use type on soil organic carbon, total nitrogen, and microbial biomass carbon and nitrogen contents in Karst region of South China[J]. Chinese Journal of Applied Ecology.

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Effects of land use type on soil organic carbon, total nitrogen, and microbial biomass carbon and nitrogen contents in Karst region of South China

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