Scientia Agricultura Sinica ›› 2011, Vol. 44 ›› Issue (15): 3162-3168.doi: 10.3864/j.issn.0578-1752.2011.15.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Distribution Characteristics of Microbial Biomass Carbon and Nitrogen in Soil Aggregates under Tea Plantation

LIU  Min-Ying, ZHENG  Zi-Cheng, LI  Ting-Xuan   

  1. 1. 四川农业大学资源环境学院
  • Received:2010-06-30 Revised:2010-10-07 Online:2011-08-01 Published:2010-10-14
  • Contact: liu minying E-mail:liuminyinglj@yahoo.com.cn

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Abstract: 【Objective】 The distribution of microbial biomass carbon and microbial biomass nitrogen in soil aggregates of tea planted area was studied on purpose to reflect the influence of tea plantation on soil aggregates and its nutrient cycling, which can provide evidence for coordinating regional land use and returning farmland to forest/tea project. 【Method】 On the basis of field investigation and laboratory analysis, abandoned land and eucalyptus plantation were selected as contrasts, distribution features of microbial biomass carbon and microbial biomass nitrogen in soil aggregates under tea plantation were studied. 【Result】 The content of soil aggregates organic carbon comparatively increased as soil aggregates particles diameter reduced. The maximum soil aggregates concentrated with organic carbon were found at ＜0.25 mm diameter under tea plantation, abandoned land and eucalyptus plantation. The content of soil aggregates microbial biomass carbon, microbial biomass nitrogen comparatively decreased when soil aggregates particle diameter reduced under tea plantation, abandoned land and eucalyptus plantation. The maximum microbial biomass carbon, microbial biomass nitrogen was found in the soil aggregates of 2-5 mm diameter under tea plantation. Except ＜0.25 mm aggregates, the contents of soil aggregate microbial biomass carbon, microbial biomass nitrogen under tea plantation were higher than abandoned land and eucalyptus plantation within the same aggregates particle diameter. Soil aggregates microbial quotient generally decreased along with soil aggregates particles reduced under tea plantation, abandoned land and eucalyptus plantation. The maximum soil aggregates microbial quotient was mainly in the 2-5 mm aggregates under tea plantation, its distribution pattern was similar to microbial biomass carbon and nitrogen. 【Conclusion】The content of microbial biomass in tea plantation soil is more plentiful than in the contrast,especially for large aggregates,which shows that conversion of farmland to tea plantation is a relatively ideal model of set-aside patterns in study area.

Key words: soil aggregates, microbial biomass carbon, microbial biomass nitrogen, microbial quotient

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