Salinity effects on soil organic carbon and its labile fractions,and nematode communities in irrigated farmlands in an arid region,northwestern China

查看全文 作　　者：YongZhong [1]Su;TingNa [1]Liu;XueFen [2]Wang;Rong [1]Yang

机构地区：[1]Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;[2]Jinlin Agricultural University,Changchun,Jilin 130118,China

出　　处：《Research in Cold and Arid Regions》索引2016年第8卷第1期,共8页

基　　金：supported by the National Natural Science Foundation of China(91425302,41401337) 摘　　要：The effects of salinity on soil organic carbon(SOC) and its labile fractions including microbial biomass carbon(MBC) and easily oxidation organic carbon(EOC),basal soil respiration,and soil nematode community in the Fluvents,an oasis in an arid region of northwestern China were investigated.Five sites were selected which had a salinity gradient with different groundwater table from 1.0 m to 4.0 m.Soils were sampled at the 0–20 cm plough layer from 25 irrigated fields of five sites and electrical conductivity was measured in the saturation paste extracts(ECe).Soils were categorized into five salinity levels:(1) non-saline,(2) very slightly saline,(3) slightly saline,(4) moderately saline,and(5) strongly saline according to the values of ECe.The results show that SOC and total nitrogen concentration,cation exchange capacity(CEC),and the concentrations of labile organic fractions(MBC,EOC),and basal soil respiration decreased significantly with increasing ECe.The relationships between ECe and MBC,EOC and basal soil respiration were best described by power functions.Slight and moderate salinity had no significant impact on soil nematode abundance,but excessive salt accumulation led to a marked decline in soil nematode community diversity and abundance.Soil salinity changed soil nematode trophic groups and bacterivores were the most abundant trophic groups in salt-affected soils.Further study is necessary to identify the response of soil microbial processes and nematode community dynamics to soil salinity. 关键词：土壤有机碳盐度梯度西北干旱区活性组分线虫群落灌溉农田中国西北微生物生物量碳

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Salinity effects on soil organic carbon and its labile fractions,and nematode communities in irrigated farmlands in an arid region,northwestern China

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