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《Acta Ecologica Sinica》 2001-04
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Protective effect of agri-land ecosystem for soil fertility

LU Jia-Long,ZHANG Yi-Ping,WANG Xu-Dong,TANG Dai-Liang,HUA Dang-Ling (College of Resources and Environment Science,Northwestern Science and Technology University of Agriculture and Forestry,Shaanxi,Yangling 712100,China)  
Research of long\|term fix\|experiments showed that in the semi\|arid area,the fallow was unfavourable to increase of soil organic matter content.It impelled to drop energy state,increase aromaticity extent and develop forward to aging of humic acid.Fallow made the soil composite aggregate change from G 2 to G\-1,decrease the activity of soil enzyme,increase the intensity of biochemistry action and decrease the level of total fertility.So,agri\|land ecosystem had protective effect of soil fertility.
【Fund】: 国家自然科学基金!重大项目 ( 39790 1 0 0 )
【CateGory Index】: S158
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