Vertical root distributions of Medicago sativa L. and Stipa breviflora Griseb.were investigated using drill method and soil water dynamics were studied by positioning field observation in the farming-pastoral interlaced region of northern Shaanxi province.The results show that root densities of M.sativa and S.breviflora decreased along with the increased soil depth,and the diameter of most roots was within l mm.The percentage of M.sativa and S.breviflora roots in 0-0.5 m soil layer were 67% and 84% of the t...
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