Study Of Pummelo Orchards Grow Grass On Runoff Soil Physical And Chemical Properties And GIS Application

In this paper,Fujian city of Zhangzhou province Pinghe County town of Wenfeng as the research object to test pummelo orchards,garden of pomelo grass cultivation experiment of different,choose light leaf vetch,rotundifolia,ryegrass,Paspalum wettsteinii 4 forage Intercropping in orchard,thus forming 4 kinds of ecological cultivation mode effect.Different grass cultivation patterns on Soil physicochemical characteristics of soil erosion and soil are different.Therefore,this study focused on the influence of pummelo orchards variety of grass cultivation patterns on soil physicochemical characteristics and effects on runoff regulation.By variance analysis,correlation analysis,surface runoff characteristics of Ecological Cultivation Study on soil characteristics and runoff were analyzed,to explore the regularity and distribution of soil erosion and sediment,the purpose is to sustainable ecological orchard cultivation and construction of water and soil conservation and Based on the experimental analysis,the following conclusions are drawn:?1?Through the study of 4 different kinds of ecological cultivation patterns on the test area found the same pattern of different soil layers compared to total porosity in 0-15 cm and 15-30 cm soil layer Paspalum wettsteinii model is best,were increased by 19.39%and 19.57%,30-45 cm soil layer in Chamaecrista rotundifolia mode is the best,up to 15.08%;to 0-15 cm and 15-30 cm soil layer Paspalum wettsteinii water in the best mode,respectively increased 36.03%and 33.98%,30-45 cm soil layer in Chamaecrista rotundifolia mode is the best,rising to 24.81%in 0;the drainage capacity of-15 cm and 15-30 cm soil layer of broad leaf bird the best millet mode,respectively increased 33.15%and 43.25%,30-45 cm soil layer in Chamaecrista rotundifolia mode is the best,up 51.52%;0-15 cm soil aeration Paspalum wettsteinii model best,increased by 7.96%,15 and 30-30 cm-45 cm Chamaecrista rotundifolia mode is the best,were raised 14.99%and 16.55%soil;The bulk density of 0-15 cm and 15-30 cm soil layer Paspalum wettsteinii model is best,reduced by 32.35%and 28.47%respectively,30-45 cm soil layer in Chamaecrista rotundifolia mode is the best,reduced by 16.44%;the soil moisture at 0-15 cm and 15-30 cm soil layer Paspalum wettsteinii model best,were improved by 14.63%and 5.93%,30-45 cm soil layer in Chamaecrista rotundifolia mode is the best,up to 3.23.The soil bulk density and soil water content showed a layer decreasing trend.In the same soil layers under different models,4 kinds of ecological cultivation,soil bulk density reduced to a certain extent,the soil moisture content,porosity,permeability,water holding capacity and the ability to drain and clean tillage compared to the control,were generally improved.From the overall improvement degree of soil physical property analysis the pomelo-,Paspalum wettsteinii model is best,followed by the pomelo-Chamaecrista rotundifolia mode.?2?The same life grass model in different soil layer,soil organic matter and total nitrogen showed with the depth gradually becomes smaller,the content of the organic matter in the great changes of layer;potassium 0-45 cm soil layer and soil total phosphorus showed the first increase and then decrease of speed effect;soil nitrogen,available potassium and available phosphorus showed with the depth of soil layer decreased.Different ecological cultivation mode of the same soil layer,soil organic matter,nitrogen,phosphorus and potassium content was generally greater than that of the control mode of cleaning tillage;soil organic matter in 0-15 cm,15-30 cm in Paspalum wettsteinii best,an increase of 26.41%-31.78%.30-45 cm in Chamaecrista rotundifolia mode the best,an increase of 23.99%;total 0-15-30 cm,15 cm and 30₄5 cm in Chamaecrista rotundifolia model is best,an increase of 22.22%-23.77%;K in soil from 0 to 15 cm,15-30 cm in ryegrass best,an increase of 8.63%-15.06%,30-45 cm in Chamaecrista rotundifolia best mode,an increase of 9.39%;total phosphorus in 0-15 cm,15-30 cm in pomelo-Paspalum wettsteinii model is best,an increase of 10.34%-12.5%,30-45 cm light leaf vetch best mode,an increase of 8.77%;the soil available nitrogen in pomelo-Chamaecrista rotundifolia model best pomelo light leaf vetch mode;soil available potassium,0-15 cm-the best mode of pomelo ryegrass increased by 22.02%,15.30 and 30 cm-45 cm-pomelo Chamaecrista rotundifolia best,an increase of 11.96%-23.75%;in soil available phosphorus,0-15 cm and 15-30 cm in pomelo light leaf vetch model is best,an increase of 6.93%-8.44%,30-45 cm in pomelo-Chamaecrista rotundifolia mode the best,an increase of 8.68 per cent.?3?Through the observation observation period on rainfall runoff,and soil tillage control plots,different ecological cultivation patterns on runoff reduction rate respectively,the circular ecological cultivation mode of pomelo,pomelo rotundifolia?64.84%?-wide ecological cultivation model for leaf sparrow paspalum?57.16%?,Italian ryegrass ecological pomelo the cultivation model?45.93%?,pomelo-light leaf vetch ecological cultivation mode?43.86%?.The sediment erosion from high to low order:Pomelo-ryegrass mode?0.287 kg?->pomelo leaves vetch?0.251 kg?->pomelo Paspalum wettsteinii model?0.235 kg?->pomelo Chamaecrista Chamaecrista rotundifolia mode?0.210 kg?,in which the circular effect of pomelo Chamaecrista rotundifolia.According to the best model of surface runoff from large to small order analysis,the surface runoff is small,the higher the grass cover degree.Through the analysis of the cell surface runoff factor in many rainfall The results showed that the different ecological cultivation measures had a certain effect on reducing runoff and sediment,reducing the peak value of runoff,and the higher the vegetation coverage,the stronger the effect.