黄土高原植被恢复对土壤肥力质量的影响研究

Effect of Plant Restoration to Soil Fertility Quality on Loess Plateau

在野外调查分析的基础上,测定了沙棘、黄刺玫、油松以及草地和农田的土壤有机质和速效养分,采用新负极差法检验了有机质含量的差异性,结果表明:(1)黄土高原半湿润地区恢复植被能够显著提高土壤的有机质含量,且草地>沙棘>黄刺玫>油松;(2)植被恢复对土壤有机质的提高效益随深度增加而明显减小,土壤有机质有一定表聚性,草地和灌木林植被下更为显著;(3)不同植被类型土壤速效氮均有大幅度增加,土壤速效磷增幅较小;土壤速效钾在草地、黄刺玫植被下有少量增加,沙棘、油松林地却有所下降。

Based on the investigation and analysis in the field, it was measured the soil organic matter and the rapidly available nutrients of young Hippophae rhamnoides,Rosa xanthina Lindl,Pinus tabulaeformis,grassland and farmland,used DUNCAN method to check the difference of organic matter. The results showed that: (1)Plant restoration could increase the content of the soil organic matter remarkably, and the effect was: grassland>Hippophae rhamnoides>Rosa xanthina Lindl>Pinus tabulaeformis; (2) With the deeper of the soil, the benefit that plant restoration the degree of development was decreased obviously, soil organic matter had the feature of gathering on the surface, it was significant in plant of grassland and bush; (3)Soil rapidly available nitrogen had great develop in different plant types; soil rapidly available phosphorus increased slightly; soil rapidly available potash of Hippophae rhamnoides and Pinus tabulaeformis were all droped sharply expect grassland and Rosa xanthina Lindl's were higher than farmland's.