It is important to accurately assess regional spatial distribution and variation of soil organic carbon and to study effects of topographies and land use on spatial distribution of soil surface organic carbon.In Yangou watershed,hilly region of the Loess Plateau,based on three topographies(tableland,slope land,gully land) and eight land uses(farmland,orchard,manmade and secondary grassland,manmade and secondary shrub land and manmade and secondary woodland),314 soil surface(0-20 cm) samples were collected t...
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