Research On The Mutual Feedback Between The Succession Of Rocky Land Desertification And Social Economic Activities In Guizhou

Rocky desertification is one of the three most serious ecological problems in China.It accelerates the deterioration of the environment,causes soil erosion,frequent natural disasters and threatens people's living environment.The outline of the Tenth Five-Year Plan for National Economic and Social Development of the people's Republic of China in 2001 clearly points out that comprehensive control of rocky desertification in karst areas of Guizhou,Guangxi and Yunnan should be promoted.Since then,the Party and the government have also stressed at important documents and conferences that it is necessary to promote the comprehensive control of rocky desertification in the region.Guizhou Province is located in the southwest of China and is one of the most typical areas in the world for the development of karst landforms,and the area of karst outburst accounts for the total area of the whole province.The area of the rocky desertification is 61.92,which is the province with the largest area,the most types,the deepest degree and the most serious harm.At present,the research on rocky desertification is mainly based on the geological and geomorphological background,ecological restoration and control,spatial pattern distribution and dynamic change.The driving mechanism and the technology and method of dynamic monitoring have been carried out,but the research on the relationship between the succession of regional rocky desertification and human social and economic activities is not deep enough,so it is urgent to study the relationship between the succession of rocky desertification and human social and economic activities.Based on this,this paper takes Guizhou Province as the research area,takes the county area as the research unit,uses Arcgis-Ecognition Developer and Spss,remote sensing data processing and statistical analysis software,based on the karst rocky desertification distribution map in 2000 and 2011.This paper analyzes the dynamic changes of rocky desertification in Guizhou province in the past ten years,and probes into the relationship between it and social and economic activities,in order to provide theoretical reference and reference for the subsequent rocky desertification control work.The main conclusions of the study are as follows:(1)At the end of 2011,1/4 of karst area in Guizhou Province is still in the state of rocky desertification,and the situation is still grim.From the spatial distribution,the degree of rocky desertification in Guizhou Province is heavy in the west,light in the east,heavy in the south and light in the north.From 2000 to 2011,the total area of karst rocky desertification in Guizhou Province showed a decreasing trend,but the area of different types of rocky desertification increased and decreased.In areas where rocky desertification is transformed into non-rockydesertification(no rocky desertification and potential rocky desertification),mild rocky desertification is the main part of the improvement of rocky desertification,but moderate,severe and extremely severe rock desertification is the main part of the improvement in the status of rocky desertification.The ratio of transfer and transfer of desert is 129.97,which shows that the status of rocky desertification has not been fundamentally improved,and it is still the difficult point in the control of rocky desertification,and the rate of evolution of rocky desertification shows that,The types of rocky desertification with low intensity are more active than those with higher intensity,the results of rocky desertification control are not significant,and the task of light rocky desertification control is still very arduous.Since the main contribution of slight rocky desertification increase is non-rocky desertification and potential rocky desertification,in addition to the control of light rocky desertification,the project should also strengthen the non-rocky desertification and potential.Protection against rocky desertification(2)The study on the driving factors of rocky desertification by using the method of correlation analysis shows that population factors,social development and economic level,agricultural production activities,Topographic slope and ecological engineering construction all play an important role in the evolution of rocky desertification.1 in karst karst areas,human activities are the biggest factors affecting and changing the environment,and the population density in a region.The proportion of urban and rural population and the number of floating population can affect the occurrence and succession of rocky desertification.In towns with secondary and tertiary industries,the greater the population density,the lighter the degree of rocky desertification,while the more agricultural karst mountain villages,Rocky desertification tends to get worse,and population outflows The correlation analysis shows that the population factors are closely related to the evolution of rocky desertification.Among them,the proportion of agricultural population is positively related to the rocky desertification,and the population density is significant.The proportion of urban population and outflow population is significantly negatively correlated with rocky desertification.2.The more economically backward areas are,the greater the degree of people's dependence on land,the higher the degree of resource plunder,the more serious the rocky desertification is.The regional economic level and social development are closely related to rocky desertification.Among them,the total output value of agriculture,forestry,animal husbandry and fishery is significantly positively correlated with rocky desertification,the proportion of construction land,industrial and mining land,and farmers is significant positive correlation.There is a significant negative correlation between per capita net income and per capita gross domestic product(GDP)and rocky desertification.3.The steep mountain slopes in karst areas make the amount of cultivated land limited,and grain production and cultivated land quality are particularly important for local people who "feed on the sky".Therefore,agricultural production activities also have an important influence on rocky desertification.Among them,grain per capita,per capita cultivated land and the proportion of cultivated land per capita are significantly positively related to rocky desertification.There is a significant negative correlation between the value of per unit cultivated land and rocky desertification.4.Guizhou geomorphology belongs to the mountainous region of the western plateau of China.The higher the topographic slope,the more likely soil and water loss will occur,which will aggravate the rocky desert Therefore,The effect of topographic slope on rocky desertification is very significant,of which 0°-6°-15°farmland specific gravity 0°-6°karst specific gravity and 6°-15°karst specific gravity have a significant negative correlation with rocky desertification.There is a significant positive correlation between the proportion of upper karst and rocky desertification.5.The construction of ecological engineering plays a very important role in the control of rocky desertification.Returning cropland to forest is an effective means to control rocky desertification and soil erosion.The proportion of cropland to forest is negatively related to rocky desertification.The larger the proportion of forest to cultivated land,the smaller the proportion of rocky desertification.(3)The evolution of rocky desertification also plays a very important role in the changes of population flow,social and economic development,agricultural production activities and ecological engineering construction.The increase in the degree of rocky desertification will destroy the living environment of people and lead to the outflow of a large number of people.The more serious the rocky desertification,the more the outflow;and the reduction of the degree of rocky desertification will increase the per capita gross domestic product.There was also a significant positive correlation between rock desertification and the change of per capita gross domestic product and per capita net income of farmers,and the improvement of rocky desertification was more and more.In large areas,the per capita gross domestic product(GDP)and the per capita net income of farmers have increased;in addition,the intensification of rocky desertification will destroy cultivated land,resulting in the loss of cultivated value of some arable land,the reduction in the amount of arable land available for cultivation and the reduction of food production.Even in some serious areas,we can only choose to return farmland to forests and grasslands.Rocky desertification is positively related to the change of grain yield,and the proportion of returning farmland to forests and grass is positively correlated with the change of sloping farmland.The larger the proportion of rocky desertification,the less arable land that can be cultivated.The more grain yield is reduced,the larger proportion of cultivated land is returned to forest and grass.