人工牧草地
人工牧草地-
黄土区人工牧草地有机氮组分变化研究
Research on Variety of Soil Organic Nitrogen Components in Artificial Herbage Land on Loess Plateau
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轻组有机碳含量，农田和牧草地比天然次生林分别低46%和14%以上，人工林比农田和牧草地分别高100%和27%以上；
The SOC content in LF OM in cropland and rangeland was 46 % and 14 % respectively lower than natural secondary forest , and those for plantations were over doubled and 27 % higher respectively than cropland and rangeland .