论文部分内容阅读
在收集陕西省泾惠渠灌区土壤普查资料的基础上,探讨了灌区土壤肥力质量从1987年到2009年的变化规律。结果表明,①1987年灌区土壤pH值变幅在8.1~8.9之间;有机质属于4~5级,含量为较缺乏到缺乏,全氮和碱解氮都为5级,皆为缺乏;速效磷含量中等,属于3级;速效钾含量丰富,属于1~2级;碳氮比值的变幅为7.25~9.90;氮磷比值变幅为1.7~6.9,氮素强度供应相对较磷素弱。②2007年灌区土壤有机质含量仍较缺乏;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;养分的空间变异系数以全磷最小,为12.6%,速效磷最大,为38.9%,速效磷在空间上分布最不均匀。③泾惠渠灌区从1987年至2009年期间,土壤pH平均值由8.4下降为8.1;有机质平均增加了58.7%;碱解氮的平均增幅为37.8%,全氮为48.6%;土壤速效磷增幅为130%,全磷为59.6%;土壤速效钾的平均增幅为20.6%。
On the basis of collecting the soil census data of Jinghuiqu Irrigation Area in Shaanxi Province, the variation regularity of soil fertility quality in irrigation area from 1987 to 2009 was discussed. The results showed that: ① In 1987, the soil pH ranged from 8.1 to 8.9; the organic matter was from 4 to 5, and the content of soil organic matter was deficient to lacking. The content of total nitrogen and available nitrogen were all in Grade 5, Medium, belonging to the third grade; the available potassium content is rich, which belongs to the first to the second grade; the C / N ratio is in the range of 7.25-9.90; the N / P ratio is 1.7-6.9; ② In 2007, the soil organic matter content in irrigation area was still relatively deficient. The total nitrogen was moderate, but the content of available nitrogen and available nitrogen were abundant. The contents of available phosphorus and available potassium in soil were abundant. The spatial variation coefficient of nutrients was the lowest with total phosphorus of 12.6% Phosphorus is the largest, 38.9%, available phosphorus in the spatial distribution of the most uneven. ③ In Jinghuiqu Irrigation District, the mean value of soil pH decreased from 8.4 to 8.1, from 1987 to 2009; that of organic matter increased by 58.7% on average; that of alkali-hydrolyzed nitrogen increased 37.8% and that of total nitrogen was 48.6% Was 130%, total phosphorus was 59.6%, and the average soil available K was 20.6%.