西藏那曲地区草地植被及土壤养分状况调查

对西藏那曲地区草地植被状况、土壤水分、养分状况进行了调查分析。结果表明:无论是从牧草生长还是从土壤水分、养分状况来看,那曲地区东西部草地存在显著差异,东部草地明显好于西部草地。东部草地的平均土壤含水量比西部草地高50%,植被覆盖度约是西部草地的2.36倍,单位面积产草量约是西部草地的3倍。那曲地区草地土壤偏碱性,东部草地土壤pH值比西部低0.6。东部草地土壤有机质、全氮、碱解氮、有效钾含量都很丰富,土壤质地均为壤质;西部草地土壤有机质、全氮、碱解氮、有效钾含量都很低,土壤砂化较严重。东西部草地土壤速效磷差别不大,并且含量都较低。

Investigation of grassland growth and soil nutrient situation in Naqu prefecture of Tibet

The grass growth,soil water content,soil nutrient in Naqu prefecture of Tibet were investigated in this paper,and the difference of west grassland and east grassland was also compared as well.The results showed that the eastern grassland and western grassland has significant difference in grass growth,soil water content and soil nutrient.The eastern grassland is generally better than the western grassland.The soil water content of east grassland is 50% higher than that of the west,the grass coverage index of the east grassland is 2.36 times of the west,and the grass yield of the east grassland is 3 times of the west.The soil pH of Naqu is alkalescence and the pH of eastern grassland soil is about 0.6 less than that of the western grassland soil.The eastern grassland soil is abundant in organic matter,total nitrogen,alkali-hydrolyzable nitrogen,active potassium,and the soil texture is loam.While the counterparts of the western grassland soil are very low and the soil texture is more sandy.But active phosphors of grassland soil is almost same and the content is low.