Apple Economic Forest In Residual Gully Area Of The Loess Plateau Research On Ecological Service Function

The ravines are vertical and horizontal and the plateau surface is split in residual Gully Area of the Loess Plateau.It is a typical ecologically fragile area in my country and a key area for the construction of returning farmland to forests.As a special ecosystem of agroforestry coupling,the apple economic forest not only provides agricultural products,but also has the ecological service function of maintaining natural environmental conditions and effects and large area of apple economic forest is planted in this area.This research will conduct in-depth research on the service functions of the apple economic forest ecosystem,establish an index system for the orchard ecological service functions,and evaluate the value and quality of the ecological service functions of the apple economic forest,providing for the green GDP accounting of forest resources in the area and the assessment of regional ecological stability data support.The specific results are as follows:(1)Taking the apple orchard in the gully area of the Loess Plateau as the research object,using theoretical analysis,frequency analysis,and expert consultation methods,according to the structure,function and characteristics of the apple orchard ecosystem,the structure is constructed to conserve water,fix carbon and release oxygen.9 ecological service function index systems for soil conservation,carbon fixation and oxygen release,forest nutrient fixation,environmental purification,biodiversity protection(soil animals),production,recreation and negative benefits.(2)The apple orchard in Yongshou County is selected as the evaluation object of ecological service value,and the evaluation methods such as shadow engineering method and market replacement method are adopted to evaluate the service value of the ecological service function of the apple economic forest.The results show that the comprehensive ecological service value of the apple economic forest in Yongshou County in 2019 was11.5587 million yuan,and the ecological service value per unit area was 68,500 Yuan/hm~2,of which the total value of positive benefit ecological services was 1294.33 million yuan,and the unit area benefit was 76,700 Yuan/hm~2,the negative benefit value is-138.45million Yuan,and the unit area loss value is 8200 Yuan/hm~2.The order of service value of each ecological service function of the apple orchard is production(837.99 million yuan)>negative benefit(138.44 million yuan)>water conservation(117.9 million yuan)>biodiversity(115.63 million yuan)>carbon sequestration Oxygen release(71.79 million yuan)>Culture and entertainment(69.78 million yuan)>Purification and regulation(40.22million yuan)>Conservation of soil(29.21 million yuan)>Forest nutrient retention(11.78million yuan).(3)Using the AHP-ambiguity comprehensive evaluation method,using 9 indicators such as water conservation and erosion resistance as the criterion layer,and 21 indicators including the canopy interception rate and root soil moisture content as the indicator layer,the orchard ecological service function quality evaluation model was established..Through the analytic hierarchy process subjective weighting and principal component analysis method,objective weighting,and then through the game theory comprehensive weighting method to determine the index combination weight value,to evaluate the ecological service quality of the apple economic forest.The evaluation can be obtained:the comprehensive evaluation index of the ecological service quality of the apple economic forest in the dilapidated gully area is 0.6038,and the comprehensive evaluation grade is good.It shows that the apple economic forest has a good ecological service status in the gully area of the ruins,and it has a certain contribution to the local ecology.The evaluation results of the criterion level show that water conservation,erosion resistance,soil conservation and production functions are the most important factors affecting the quality of ecological services of the apple economic forest.Among them,the evaluation level of erosion resistance is excellent;the evaluation level of water conservation,biodiversity,and production is good;the evaluation level of purification,soil conservation,and forest nutrient retention is medium;the evaluation level of non-point source pollution and cultural function is poor.The apple economic forest in the dilapidated gully area is located in a special area,and due to man-made management,the fertilization amount of the forest is too high,the concentration of negative ions is low,and the irrational operation leads to the low soil nutrient value,resulting in the comprehensive evaluation of the ecological service quality of the apple economic forest.medium level.The apple economic forest has great ecological service value in the gully area of the ruins,and the quality of ecological service is at a good level,maintaining the stability of the local ecology.There is still room for further improvement of the ecological service functions of apple orchards.Combining effective management methods and technologies can enhance the ecological service functions of apple economic forests in terms of improving soil fertility and improving vegetation structure.