摘要
采用高矿化度的咸水与淡水按一定比例进行混合灌溉,分析不同矿化度的微咸水滴灌对枣树根区土壤碱解氮的影响模型。结果表明:当枣树根区土壤碱解氮的运移转化时间相同时,随着灌溉水矿化度的增加,土壤碱解氮的含量也随之增加,变化量越低,转化率越小。当矿化度相同时,土壤碱解氮平均值随运移转化时间先增大后减小,碱解氮的变化量呈递增趋势,而碱解氮变化率却呈现递减趋势。在分析不同矿化度的微咸水对土壤碱解氮影响的基础上,建立了微咸水的矿化度、碱解氮的运移转化时间与土壤碱解氮平均含量、变化量以及变化率之间的相互定量关系,并得到了相应的回归方程。
This paper analyzed the effect of drip irrigation with brackish water with different salinities on the con- tent of soil alkali-hydrolyzable nitrogen in rhizosphere of Ziziphus jujuba trees based on the experiment of irrigation with mixed salty water and fresh water. The results showed that the content of soil alkali-hydrolyzable nitrogen in rhizosphere of Z. jujuba trees was increased with the increase of salinity of irrigation water when the migration and transformation time of soil alkali-hydrolyzable nitrogen was the same. The average value of soil alkali-hydrolyzable nitrogen content was increased at first and then decreased with the migration and transformation time of soil alkali- hydrolyzable nitrogen when the salinity of irrigation water was the same. Under the same salinity of irrigation water, the change extent of soil alkali-hydrolyzable nitrogen content was in an increase trend, but the change rate was in a decrease trend. Based on analyzing the effect of irrigation brackish water with different salinities on soil alkali-hy- drolyzable nitrogen content, the quantitative relationships among the salinity of brackish water and the migration and transformation time, average content, change extent and change rate of soil alkali-hydrolyzable nitrogen were devel- oped, and the regression equations were also derived in this study.
出处
《干旱区研究》
CSCD
北大核心
2013年第3期424-429,共6页
Arid Zone Research
基金
国家自然基金项目(51169024
31060084)
水利部公益性行业专项(201101050)
