甘肃省中部干旱区植被恢复对土壤养分变化的影响研究

通过对甘肃省中部干旱区植被恢复过程中不同退耕年限(0年、3年、6年和10年)的土壤养分及各养分间的相关性进行了分析,研究结果表明:1)不同退耕年限对安定区土壤养分除全钾外对有机质和其它氮磷钾养分均有极显著或显著影响。2)植被恢复过程中养分在土壤剖面的分布具有明显的层次性,各养分具有明显的表聚性。3)土壤有机质的变化与全氮、速效氮呈现出显著的相关性,与钾素和磷素的相关性较低。全磷与速效钾和氮养分相互间显著相关,与速效磷相关性较小。全钾与速效钾相关性也未达到显著水平。

Effects of vegetation rehabilitation on soil nutrient variation in central arid region of Gansu Province

We has researched the coorelation among sorts of soil nutrients contained in vegatation land which had been used as farmland based on different rehabilitation time(0,3,6 and 10 years) on the central arid region of Gansu Province.The results indicated that(1) Apart from total K,the other organic matter,nitrogen,phosphorus and Potassium are significant related to the period of rehabilitation in Anding district.(2) In the process of vegetation restoration the distribution of nutrients in the soil profile has a clear hierarchy,the nutrient table with a clear cohesion.(3)The chaning of soil organic matter shows a stronger relationship with available nitrogen than potassium and phosphorus.Total phosphorus and potassium and nitrogen nutrients are significantly related to each other,and less relevant with available P.Total potassium and available potassium are also not significantly related to each other.