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《Bulletin of Soil and Water Conservation》 2011-05
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Temporal Effects of Gravel-Sand Mulching on Soil Microbial Population and Soil Enzyme Activity in Croplands with Continuous Cultivation

QIU Yang,WANG Ya-jun,XIE Zhong-kui,ZHANG Ya-juan(Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,Lanzhou,Gansu 730000,China)  
Soil samples collected from continuous croplands with 2,7,11,15 and 20 year gravel-sand mulching in Gaolan Research Station,Gansu Province were analyzed for soil microbial population and soil enzyme activities.The results show that with increase of mulching time,soil microbial population decreased from the beginning to a low stable state in about 7 to 11 years,and then the Shannon diversity index and Mclntosh diversity index continued to decrease.The enzyme activities of soils showed a parabola curve over time.Most of them increased and reached their peaks in 10 to 11 years,and then declined.The soil enzyme activity of the cropland covered for more than 15 years was so low that the yield of the crops decreased.At this stage,farming practices should be stopped,and compost should be added with renewal of soil sand to recover the productivity of the land.The results of the study can provide a theoretical basis for the sustainable utilization and management of the gravel-sand mulched croplands.
【Fund】: 中国科学院农业项目“黄土高原中西部地区资源高效型生态农业研究与示范”(CASN-115-06-08)
【CateGory Index】: S154
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