SOIL BULK DENSITY IN CROPLANDS OF NORTHEAST CHINA UNDER DIFFERENT LANDSCAPE ATTRIBUTES

Le résumé fourni par la source

It will be of importance for refining agricultural management and sustainable land use to understand the spatial variability and related fact ors of soil physical properties. The present study addressed the spatial distribution characteristics of bulk densit y (BD) and effects of landscape attributes in agric ultural soils of typical County of Northeast China, using convention al statistics, geostatistics and Geographic Informa tion Systems. Data from 101 locations were collected in a Jiutai County, Northeast China. Results showed th at, BD in croplands of the study area generally follows a nor mal distribution. The experimental variogram of BD has been fitted with linear models. Although not significant at the 0.05 level, soil samples with smaller eleva tion have relatively higher bulk density than those with bigg er elevation. Land use types significantly ( P<0.05) affected BD values. Soil samples from dry farming land and from paddy field have higher BD values than those fr om vegetable land. In explanation, in this area, veget able land is applied more manure to maintain soil f ertility and increase vegetable output.

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