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当前位置: 首页 > 文章 > 秸秆覆盖下土壤养分与微生物群落关系研究 水土保持学报 2016,30 (2) 294-300
Position: Home > Articles > Study on the Relationship Between Soil Nutrients and Microbial Community Composition After Cornstalk Mulching Journal of Soil and Water Conservation 2016,30 (2) 294-300

秸秆覆盖下土壤养分与微生物群落关系研究

作  者：
丁红利;吴先勤;张磊
单  位：
西南大学资源环境学院
关键词：
秸秆覆盖;有机质含量;土壤养分;土壤微生物;PLFA
摘  要：
以我国17省的85个土壤样品为研究对象,定量添加玉米秸秆置于30℃培养90d,研究处理后土壤有机质(SOM)含量及养分变化与微生物群落之间的关系。结果表明:土壤各理化指标除全氮、碱解氮、全磷含量在处理后部分土壤减少以外,全钾、速效钾、速效磷含量均显著增加;SOM变化差异显著,根据其变化量将土壤分为I_1组有机质增量(I)>12.05g/kg,I2组0.25
译  名：
Study on the Relationship Between Soil Nutrients and Microbial Community Composition After Cornstalk Mulching
作  者：
DING Hongli;WU Xianqin;ZHANG Lei;College of Resources and Environment,Southwest University;
关键词：
straw mulching;;organic matter content;;soil nutrient;;soil microbial community;;PLFA
摘  要：
There are lots of researches about dynamics of microbial decomposition and soil nutrients during straw returning to soil,but the differences in soil properties between different soil types were neglected.To investigate the changes of soil organic matter(OM)and relationships between soil nutrients and microbes by adding corn-stalk,85 soil samples were collected from 17 provinces in China and placed under 30℃and cultivated for90 days.The results showed that:except the contents of total nitrogen,available nitrogen,and the total phosphorus reduced in part of the samples,total potassium,available potassium,and available phosphorus contents were increased in all of the samples after treatment.Based on the changes of soil OM,all the samples were divided into 3groups:I_1group with OM increment>12.05g/kg,I_2 group with OM increment between 0.25g/kg and 9.00g/kg,I_3 group with OM reduction between-0.30g/kg and-112.30g/kg.Soils in I_1 and I_3groups had the similar higher original OM content,however the totally opposite trends of OM matter variation occurred after treatment,and group I_2 with the lower OM than I_1 and I_3experienced insignificant increase in soil OM.The cultivable cell number of bacteria was significantly higher than those of fungi and actinomecetes in all original soil samples,however straw mulching stimulated the multiplication of fungi and actinomecetes but restrained the growth of bacteria at the same time,especially in I_3 group.Compared with the original soils,soil microbial biomass carbon(MBC)of I_2 or I_3were either no significantly changed or significantly decreased after adding cornstalks.On the other hand,most of the I_1 group soil samples MBC after adding cornstalks increased significantly.PLFA results depicted that I_2 group samples faced the most stress on nutrient and environmental perspectives among the 3groups which could attribute to the average 10.3% decrease of MBC in I_2 samples.Overall,this study indicated that the effect of straws adding on the soil quality depends much more on the original soil microbial community and composition than on the soil original nutrient background,and the method of PLFA could be used to predicate the effect of straw adding.

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