土壤修复与覆盖防草布对台地柚园氮磷流失的影响

为促进果园生草栽培技术推广和做好果园土壤酸化治理工作,更好促进琯溪蜜柚生产的高质量发展,利用径流小区法,观测琯溪蜜柚果园土壤修复和覆盖防草布对果园土壤径流量和对氮、磷面源污染的控制效果差异.结果 表明:(1)果园覆盖防草布可显著降低地表径流量,各次产流量为对照区的21.29％～86.29％;(2)施用沸石粉和白云石粉能...

Effects of Soil Remediation and Mulching with Grass-proof Cloth on Soil Nitrogen and Phosphorus Loss in Tableland Pomelo Orchard

To promote the popularization of grass planting techniques and soil acidification treatments in orchard, and enhance the high-quality development of Guanxi pomelo production, the runoff plot method was used to observe the control effect of mulching with grass-proof cloth and soil remediation on soil runoff and non-point source pollution of nitrogen and phosphorus in Guanxi pomelo orchards. The main results showed that: (1) mulching with grass-proof cloth could significantly reduce the surface runoff, and the runoff of each time was 21.29%-86.29% of the control area; (2) zeolite powder and dolomite powder could significantly reduce the concentration and loss of total nitrogen and soluble total nitrogen in runoff, and the total nitrogen loss was 64.16% and 63.39% of the control (the cleaning tillage) respectively, and the soluble total nitrogen concentration was 56.76% and 57.65% of the control (the cleaning tillage) respectively; zeolite powder and dolomite powder could reduce the concentration and loss of total phosphorus and soluble total phosphorus in runoff, but the difference was not significant; the effects of zeolite powder and dolomite powder had no significant difference; (3) mulching with grass-proof cloth could significantly reduce total nitrogen loss and soluble total nitrogen concentration of soil runoff, significantly reduce total phosphorus and soluble total phosphorus concentration of annual runoff; the average concentration of annual runoff total phosphorus and annual runoff soluble total phosphorus was 0.035 and 0.006 mg/L, respectively; the total phosphorus of runoff was significantly reduced by 11.54 g/hm², and the total phosphorus loss of annual runoff was very significantly reduced by 2.02 mg/hm². The techniques of grass planting could reduce runoff volume and the concentration of nitrogen and phosphorus in runoff, so as to cut down the loss of nitrogen and phosphorus; the treatments of soil remediation could reduce the concentration of nitrogen and phosphorus in runoff, to decrease the loss of nitrogen and phosphorus.