Study On Spatial-Temporal Changes Of Intensive Use Level Of Cultivated Land And Its Influencing Factors In Counties Of Yunnan Province From 2010 To 2015

Yunnan Province is located in the western part of Yungui Plateau,the mountainous,plateau and hilly area accounts for 94% of the province's total land area.The characteristics of the landscape mainly based on the highland mountains lead to the low per capita arable land and the low quality of cultivated land in Yunnan Province.This makes Yunnan Province for the intensive utilization of cultivated land level has a higher demand.Improving the level of intensive utilization of cultivated land is of great significance to the food security,farmers' income,ecological environment and social and economic stability and development in Yunnan Province.From four dimensions: input intensity,utilization degree,utilization benefit and sustainability of utilization,20 indicators were selected to construct the evaluation index system of intensive utilization of cultivated land in Yunnan Province,and the degree of intensive utilization of cultivated land in 129 counties in Yunnan Province was measured in 2010 and 2015.The time series change of intensive utilization of cultivated land was analyzed by using the change rate index and Kernel density estimation method,the spatial change of intensive utilization degree of cultivated land was analyzed by ArcGIS technology,and the factors affecting the utilization level of cultivated land in Yunnan Province were analyzed by the obstacle model.The results show that:(1)The overall level of intensive utilization of cultivated land in county areas of Yunnan Province is low,and the utilization method of cultivated land is relatively extensive.In 2010,the level of arable land utilization was dominated by intensification and basic intensification,of which,the level of intensive utilization of cultivated land accounted for 55.81% of the total number of county units,and the proportion of counties with intensive utilization of cultivated land was 34.11%;The level of intensive use of arable land was dominated by basic and moderate intensification in 2015,the number of county units with basic and moderate intensification of intensive utilization level of cultivated land was respectively accounted for 37.98% and 38.76% of 129 County units;While the number of county units with the level of intensive utilization of cultivated land increased from 4 in 2010 to 21 in 2015.From the 2010 and 2015 intensive utilization of cultivated land,the level of intensive utilization of cultivated land in Yunnan Province in 2015 was improved to a certain extent compared with 2010,but the intensive utilization of cultivated land is still at a low level.(2)The regions with similar intensities of cultivated land in Yunnan province have obvious spatial agglomeration characteristics.In 2010,the overall level of intensive use of arable land in Yunnan province is low,the higher the level of intensive use of arable land areas are mainly concentrated in the middle of Yunnan and Qujing city,which is located in the east of Yunnan,other areas did not have intensive use of arable land;In 2015,the level of intensive utilization of arable land in the county of Yunnan province has improved a certain extent compared with 2010,and the areas with higher intensities of arable land utilization have larger expansion compared with 2010,and the areas with higher intensities are mainly concentrated in the central part of Yunnan Province,showing the East-West strip distribution.At the same time,from the view of spatial distribution of the two periods of intensive utilization of arable land,Yunnan county's low level of intensive use of arable land mainly located in the southwest and northwest Yunnan region,the lowest level of intensive use is the Wuhua district.(3)Between 2010 and 2015,the intensive utilization of cultivated land in counties in Yunnan Province showed an overall upward trend.The results of the measurement rate of the intensive utilization rate of cultivated land can be seen,in 2010-2015,in addition to most counties in Qujing City,Kunming City,the county of Xun Dian and the official ferry area,as well as Yuxi City Tonghai County showed different degrees of decline,the remaining 92.25% of the county area of cultivated land intensive utilization rate showed an upward trend.Among them,the decline in the county(-30.47%)and the increase in Sui jiang County(60.24%)were the most significant.At the same time,the various levels of sub-index also show the overall upward trend.In addition,the distribution of kernel density estimation curve shows that the difference in the level of intensive utilization of cultivated land between counties in Yunnan Province has been increasing between 2010 and 2015.(4)The input intensity and utilization benefit have always been the most important barrier factors affecting the intensive utilization of cultivated land in Yunnan Province,and the most important obstacle stakes have changed from the utilization benefit in 2010 to the input intensity in 2015.From the indicator level,the main obstacle factors affecting the intensive utilization of cultivated land in Yunnan Province are the 2010 technology efficiency,power input index,agricultural film input index,land average output value,pesticide input index and labor average output value into the power input index,technical efficiency,pesticide input index,Indicators such as the agricultural film input index and the fertilizer input index.Among them,the power input index,technical efficiency,agricultural film input index and pesticide input index are always important obstacles to restrict the level of intensive utilization of cultivated land in Yunnan Province.