绿肥覆盖对紫色土坡耕地柑橘园氮磷流失的阻控效应研究

为探明紫色土坡耕地不同绿肥覆盖对柑橘园径流和养分流失的阻控效应,在田间径流小区设置黑麦草(Lolium perenne L.)、光叶苕子(Vicia villosa Roth var.)、二月兰(Orychophragmus violaceus)和清耕对照4个处理,定量监测了在自然降雨条件下不同处理的径流及氮磷养分流失...

Control Effect of Green Manure Cover on Nitrogen and Phosphorus Loss of Citrus Orchard on Purple Soil Slope Farmland

In order to explore the effects of different green manure cover on the runoff and nutrient loss of the citrus orchard on the purple soil slope farmland, four treatments (Lolium perenne L., Vicia villosa Roth var, Orychophragmus violaceus, and clean tillage control) were set up to quantitatively monitor the runoff and nitrogen and phosphorus loss of different treatments under natural rainfall conditions. The results showed that compared with the clean tillage control, green manure cover significantly reduced the surface runoff by 8.7%~27.0%, total nitrogen loss by 30.1%~50.6%, and total phosphorus loss by 32.4%~62.9%.However, the effects of green manure cover on runoff and nutrient control were different among different varieties, and the trend of overall performance was Lolium perenne L.>Vicia villosa Roth var. >Orychophragmus violaceus. Compared with clean tillage control, Lolium perenne L. treatment reduced the total loss of total nitrogen, soluble nitrogen, nitrate nitrogen, and ammonium nitrogen in runoff by 50.6%, 47.0%, 49.5%, and 48.1% respectively; total phosphorus, soluble phosphorus, and total loss of phosphate was reduced by 62.9%, 62.6%, and 62.6% respectively. In addition, the effect of green manure cover on different nutrient forms were also different, and the loss of soluble nitrogen and particulate phosphorus in the runoff were the largest, accounting for 59.6%~67.0% and 68.6%~71.8% of total nitrogen and total phosphorus, respectively. In summary, green manure cover cultivation can effectively reduce the runoff and nitrogen and phosphorus loss of citrus orchards on purple soil sloping farmland. Among them, Lolium perenne L. and Vicia villosa Roth var. cover were the best. Taken together, our results provide reference for water and soil conservation and non-point source pollution prevention and control in citrus orchards on purple soil slope farmland.