| Grassland animal husbandry is one of the measures for the development of ecological industries in the control of rocky desertification.At present,the effect of grassland animal husbandry on rock desertification control and whether the model is appropriate have not been systematically quantitatively evaluated.This study is based on the theory of ecological balance theory,sustainable development of animal husbandry,rock desertification control and the coupling of grassland animal husbandry and other theories,3 times soil samples were collected from 6 artificial grasslands and 3 control groups by field investigation in the Bijie Salaxi research area,Guanling-Zhenfeng Huajiang research area,and Shibing Karst research area in 2018,and 13 soil indicators were analyzed in laboratory experiments and compared to evaluate the ecological benefits brought by artificial grassland;Based on the grassland soil data monitored in 2016-2017 and the statistical yearbook data of social and economic development,coupled with the qualitative and quantitative evaluation method,the Delphi method and the Analytic Hierarchy Process were used to construct evaluation index system and evaluation model of karst rock desertification control animal husbandry benefits,and a comprehensive evaluation of grassland animal husbandry benefits was conducted in Qixingguan District of Bijie,Zhenfeng County,Guanling County and Shibing County.(1)The establishment of artificial grasslands for the control of karst rocky desertification as a whole can effectively improve soil ecological environment.Compared with cultivated land and bare land,artificial grassland significantly increased soil organic matter,total nitrogen,and alkali-decomposed nitrogen content(P <0.05).Alfalfa(Medicago sativa)grassland has the highest soil organic matter content,which is 2.53 times that of bare land;the total potassium and available potassium content of artificial grassland soil is lower than that of cultivated land and bare land.The total porosity,capillary porosity,capillary water holding capacity,field water holding capacity,and water content of artificial grassland were significantly higher than that of cultivated land and bare land(P <0.05),and the soil bulk density of artificial grassland was significantly lower than that of cultivated land and bare land.The establishment of artificial grassland in the karst rock desertification control area in southern China can effectively improve the soil nutrient status as a whole.Compared with cultivated land and bare land,artificial grassland significantly increased soil organic matter,total nitrogen,and alkaline nitrogen content(P <0.05),alfalfa grassland had the highest soil organic matter content,2.53 times that of bare land;white clover and ryegrass The mixed grassland had the highest total nitrogen and alkaline nitrogen content in the soil,which were 2.22 times and 2.65 times of the cultivated land respectively.The content of total potassium and available potassium in artificial grassland soil is lower than that of cultivated land and bare land.(2)The qualitative and quantitative methods were coupled to construct an index system suitable for the evaluation of karst rock desertification grassland animal husbandry benefits,including the target layer,the criterion layer and the indicator layer.The target level is the evaluation of grassland animal husbandry benefits of rock desertification control,the criterion level includes economic benefits,social benefits and ecological benefits and the indicator layer is 17 specific indicators connected with the criterion layer.(3)The benefit evaluation model of karst rock desertification control grassland animal husbandry was established.Based on the practical application research of the model construction method and model construction method in the field of animal husbandry,on the basis of the evaluation index system of the grassland animal husbandry benefit evaluation of rock desertification control,the Analytic Hierarchy Process was used to construct the evaluation model.By constructing the judgment matrix and the hierarchy Single,total ranking and consistency inspection determine the index weights,and finally use the weighting function and mathematical model to propose a model for evaluating the benefit of karst rock desertification grassland animal husbandry.(4)Based on the statistical methods of the indicator data and the scope of the statistical area,the evaluation of the benefits of the grassland animal husbandry of the rock desertification control in the research areas is based on the four counties / districts involved.After standardizing the original data,it is substituted into the benefit evaluation model,and the results show that the benefit in 2016 and 2017 is expressed as,economic benefits: Zhenfeng County(0.447,0.413),Guanling County(0.437,0.446)> Qixingguan District(0.354,0.387)> Shibing County(0.268,0.236);Social benefits: Qixingguan District(0.311,0.312)> Shibing County(0.261,0.278)> Zhenfeng County(0.248,0.260)> Guanling County(0.222,0.249);Ecological benefits: Qixingguan District(0.411,0.413)> Shibing County(0.379,0.373)> Zhenfeng County(0.328,0.327)> Guanling County(0.318,0.315);Comprehensive benefits: Qixingguan District(0.361,0.376)> Zhenfeng County(0.356,0.345),Guanling County(0.342,0.351)> Shibing County(0.302,0.291). |
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