毛乌素沙区土壤养分含量特征及其生产性能反应——以乌审旗为例

对乌审旗土壤养分测定结果表明,水成土和半水成土(沼泽土、草甸土),有机质含量高,潜在肥力强,速效养分差;地带性土壤(栗钙土)、初育土(黄绵土、风沙土),有机质含量低,但速效养分较高。产生上述现象的原因,决定于环境因素和土壤资源利用的管理水平,特别是水热条件的作用很大。 通过乌审旗土壤养分分析,可以看出毛乌素沙区,土壤养分含量较低。除沼泽土和草甸土有机质含量可作为一级肥力外,分布面积广阔的风沙土,黄绵土,肥力水平均属二级以下,必然影响农作物和牧草的产量。

CHARATERISTICS OF NUTRIENT CONTENT IN SOILS OF MU US SANDY LAND AND ITS RESPONSES IN PRODUCTIVE PROPERTIES——Take Uxin Banner As An Example

The analysing result of nutrients in soils of Uxin Eanner shows that theorganic matter content of the hydromorphic soils (bog soil, meadow soil) ishigh, and the potential fertility is capable, but the effective nutrients arepoor. The organic matter content in the zonal soil (chestnut soil) and theentisol (cultivated loessial soil, aeolian sandy soil) is low, however, thecontent of available nutrients is relatively high. The reasons leading to theabove phenomenon are decided by environmental factors and the managementstandard of soil resources utilization. Through the analysis of nutrients in soils of Uxin Banner, it can beseen that the nutrient content in soils of Mu Us Sandy Land is comparativelylow. Except the bog soil and the meadow soil whose content of organicmatter may be included in the first class fertility, whereas the widelydistributing aeolian sandy soil and cultivated loessial soil belong to the second(or under second) class fertility, which gives responses in the yield of cropsand forage grasses.