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Differences in Soil Microbial Biomass and Activity for Six Agroecosystems with a Management Disturbance Gradient

查看全文 作　　者：ZHANGWei-[1]Jian;FENGJin-[1]Xia;[2]J.WU;[2]K.PARKER 高影响力作者 机构地区：[1]DepartmentofAgronomy,NanjingAgriculturalUniversity,Nanjing210095(China).;[2]DepartmentofPlantPathology,NorthCarolinaStateUniversity,Raleigh,NC27695(USA)高影响力机构 出　　处：《Pedosphere》索引2004年第14卷第4期,共8页高影响力期刊 基　　金：Project supported by the National Natural Science Foundation of China (No. 40231016) ; the National Science Foundation of America (No. DEB-00-01686). 摘　　要：Different management practices in six agroecosystems located near Goldsboro, NC, USA were conducted including a successional field (SU), a plantation woodlot (WO), an integrated cropping system with animals (IN), an organic farming system (OR), and two cash-grain cropping systems employing either tillage (CT) or no-tillage (NT) to examine if and how microbial biomass and activity differ in response to alterations in disturbance intensity from six land management strategies. Results showed that soil microbial biomass and activity differed, with microbial activity in intermediately disturbed ecosystems (NT, OR, IN) being significantly higher (P < 0.01) than systems with either high or low disturbance intensities. There was also a significant and a highly significant ecosystem effect from the treatments on microbial biomass C (MBC) (P < 0.05) and on microbial activity (respiration) (P < 0.01), respectively. Multiple comparisons of mean respiration rates distinctly separated the six ecosystem types into three groups: CT < NT, SU and WO < OR and IN.Thus, for detecting microbial response to disturbance changes these results indicated that the active component of the soil microbial community was a better indicator than total biomass. 关 键 词：农业系统 碳保持力 干扰强度 单位面积微生物数量 土壤微生物活性
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