Topsoil microbial carbon and nitrogen and enzyme activity of different city zones in Nanjing,China

Abstract

Abstract: Much attention has been paid to the pollution of urban soils and its impact on environmental quality and social development.But little has been known about its microbial habitat.In this paper,the Nanjing city was divided into six zones as smelter industry,inner commercial,inner residence,newly developed,urban green area and preserved scenic zones.The microbial biomass C and N,urease activity and catalase activity in these six zones were analyzed and the influencing factors on their distribution and variation were discussed.High contents of microbial biomass C (C_mic) and N (N_mic) was found in the green area and preserved scenic zones,while low contents in the newly developed and the inner commercial zones.Principal component analysis showed that urease activity,C_mic and catalase activity were the main parameters contributing dominantly to the principle factors.Compared with the results of agricultural soils reported elsewhere,the urban soils of Nanjing city had wide variation both in the ratio of C/N and in C_mic/C_org.All these results supported that the urban environment was largely disturbed by anthropogenic stress and the microbial community was greatly modified.

Key words: Di-n-butyl phthalate, Biodegradation, Mangrove

CLC Number:

Q935

WANG Huanhua, LI Lianqing, PAN Genxing, WU Xinmin . Topsoil microbial carbon and nitrogen and enzyme activity of different city zones in Nanjing,China[J]. cje, 2005, (3): 273-277.

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