| In recent years,many scholars have explored and summarized the current situation,countermeasures and pattern classification of agroforestry combined management mode,which has strong guidance and reference,but also has some deficiencies.In the past few studies and integrated desertification control project,the lack of a certain extent of promotion in practical work.Therefore,it is of certain research value to analyze the comprehensive benefits of different agroforestry combined management modes from the perspective of soil and water conservation through major ecological management projects.This study chose the fine long meng village,long shun redundant DE grey river,compared shaxi ditch,xingyi of ju river and clear lung meng village five rocky desertification comprehensive management of small watershed as the research object,a total of 50 typical families of deployed,nine soil survey sample collection and sample area,25 crops and four runoff and sediment observation area,through data collection,farmers and typical sample investigation,soil sampling and analysis,benefit model of runoff plots fixed-point observation and comprehensive analysis methods,such as the mode of agroforestry in the study area,soil fertility and soil mechanical composition,the benefits of flow and sediment reduction,and analyzed the soil and water conservation comprehensive benefits evaluation.At the same time,local site staff were entrusted to maintain the soil sample collection site,observation plot and observation equipment,take regular samples,and conduct ground observation by setting up slope runoff plot,simple rain gauge station and other field observation facilities in qinglong mengzhai and fenggang shaguigou watershed to obtain soil erosion data and analyze the benefit of flow and erosion reduction.The model of stone desertification project was evaluated from two aspects of economic benefit and ecological benefit.Main conclusions of this paper:From the perspective of soil fertility and tea,walnuts,peach three agroforestry models were significantly improved the soil N and organic matter content,from the point of integrated index of soil fertility evaluation results,development of agroforestry model can well improve soil fertility,from farmland economic(fruit),mixed farmland,woodland soil fertility showed a trend of rising;From the perspective of soil mechanical composition,the change of land use pattern in the study area did not result in the fundamental change of soil texture.From the point of change of the runoff and sediment,the land utilization way from farmland,mixed farmland,occurring in the process of the transition of the economic forest runoff and sediment loads into decline,with the growth of economic forest,vegetation coverage increases,plant root system developed,the soil macropore increased significantly,effectively reduce the K value,enhance the corrosion resistance of soil,has played a very good effect to soil and water conservation.From the perspective of economic benefits,the economic coefficients of different agroforestry modes are different.The average economic coefficients of peach,Chinese prickly ash and honeysuckle are higher than those of corn,indicating that the usable amount of their crops is more than that of corn planting.The average economic coefficient of tea was lower than that of corn,which showed the limitation of tea yield.Affected by seedlings not hanging fruit,walnut economic coefficient and corn is basically the same,play the benefits of corn is still.This paper argues that the quality of seedling,planting,fertilizer application,the late management and outside the interference of other human factors,etc.,different mode ofagroforestry in soil fertility,corrosion resistance,and social and economic benefits of flow and sediment reduction and negative difference only to a certain extent,reflects the advantages and disadvantages of planting different crops,the pros and cons of the embodiment of the comprehensive model need to be more in-depth research. |
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