蓄水坑灌灌施条件下苹果园土壤氮素分布特性研究

Research on the Apple Orchard Soil Nitrogen Distribution Characteristic under Water Storage Pit Fertigation

为探究蓄水坑灌灌施条件下灌水量对苹果园土壤氮素分布规律的影响,本文通过田间实验就蓄水坑灌灌施条件下灌水量对苹果园土壤氮素分布规律进行了研究。结果表明:灌水量对土壤碱解氮和硝态氮分布影响范围基本一致,硝态氮和碱解氮浓度峰值集中在蓄水坑坑壁外围水平10cm范围内,随着与蓄水坑坑壁距离的增加而降低。随着灌水量的增加,蓄留在蓄水坑坑壁外围水平10cm范围内碱解氮和硝态氮量减少;随着土层深度和径向距离的增加,各处理间碱解氮和硝态氮量随着灌水量的增加而增加。该试验条件下,碱解氮和硝态氮相关系数为0.926,硝态氮量占碱解氮量百分比较大,建立了碱解氮和硝态氮的相关关系式。

To explore the effect of irrigation quantity on soil nitrogen distribution characteristics in the apple orchard under water storage pit fertigation, a field experiment is conducted for this paper. The results show that the affecting scope of irrigation volume on the distribution of soil available and nitrate nitrogen is basically same, the nitrate and alkaline hydrolysis nitrogen concentration peak is concentrated in the horizontal 10 cm range of water storage pit wall and decreases as the distance with water storage pit in- creasing. With the increase of irrigation amount, the available and nitrate nitrogen reservoir in the horizontal 10 cm range of water storage pit wall decrease. With the increase of soil depth and radial distance, the amount of effective and nitrate nitrogen increase with the increase of irrigation amount among different treatments. Under the conditions of this experiment, the available and nitrate nitrogen correlation coefficient is 0. 926, the nitrate nitrogen account for large percentage of alkaline hydrolysis nitrogen. Also, the relational expression between alkaline hydrolysis and nitrate nitrogen is established in the paper.