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文中对陕西省泾惠渠灌区土壤肥力现状进行了调查分析,并对土壤肥力质量做出了综合评价。结果表明:整个灌区土壤有机质含量处于较缺乏状态;土壤全氮为中等水平,但碱解氮含量较缺乏,土壤中速效磷和速效钾的含量丰富;从养分的空间变异系数看,以全磷最小,为12.6%,速效磷最大,为38.9%,速效磷在空间上分布最不均匀;土壤养分各因子之间相关性分析表明,pH与有机质、全氮呈极显著负相关,与速效钾呈显著负相关。土壤有机质与全氮、碱解氮呈极显著正相关,与速效钾呈显著正相关。土壤全氮与碱解氮之间存在着极显著的正相关性,两者皆可作为土壤供氮水平的指标。土壤中的全磷和速效磷呈极显著正相关;整个灌区土壤综合肥力指数平均值为0.852,属于高肥力水平,这与灌区的实际情况相吻合。
In this paper, the status quo of soil fertility in Jinghuiqu Irrigation Area in Shaanxi Province was investigated and analyzed, and the comprehensive evaluation of soil fertility quality was made. The results showed that the content of soil organic matter in the whole irrigation area was in a relatively deficient state. The soil total nitrogen was at a medium level, but the content of available nitrogen was relatively deficient, and the contents of available and available potassium in soil were abundant. From the spatial variation coefficient of nutrients, The lowest was 12.6%, the highest available phosphorus was 38.9%, the available phosphorus was most unevenly distributed in space. The correlation analysis of soil nutrient showed that there was a significant negative correlation between pH and organic matter and total nitrogen, Significantly negative correlation. Soil organic matter was significantly and positively correlated with total nitrogen and available nitrogen, but positively correlated with available potassium. There was a significant positive correlation between soil total nitrogen and available nitrogen, both of which could be used as indicators of soil nitrogen supply. Soil total phosphorus and available phosphorus showed a very significant positive correlation; the overall irrigated soil comprehensive fertility index average of 0.852, belonging to a high level of fertility, which is consistent with the actual situation in the irrigated area.