论文部分内容阅读
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。
Through analyzing the relationship between soil nutrients and nutrients in different restoration years (0 years, 3 years, 6 years and 10 years) in the process of vegetation restoration in the central arid region of Gansu Province, the results show that: 1) In addition to total potassium, soil nutrients in Anding District had significant or significant effects on the nutrients and other NPK nutrients. 2) The distribution of nutrients in the soil profile during the process of vegetation restoration has obvious gradation, and each nutrient has obvious surface aggregation. 3) The changes of soil organic matter showed a significant correlation with total nitrogen and available nitrogen, but lower correlation with potassium and phosphorus. Total phosphorus and available potassium and nitrogen nutrients were significantly correlated with each other, and available phosphorus less relevant. Correlation between total potassium and available potassium did not reach significant levels.