Over the last few decades the extent of land-use has been dramatic changed and the vegetation cover has been shifted in the Loess Plateau.For understanding the changes of the rehabilitated grassland on abandoned cropland,vertical distribution of root biomass and root length density were studied by the method of space series replaced time courses.The result showed that the dig sampling method was superior to the root core method in the result of root biomass from soil layer 70 cm to 150 cm.Total root biomass...
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