| As one of the important foundations of national security,food security plays a vital role in the long-term stability of the country and the people’s living and working in peace and contentment.Cultivated land is the foundation for maintaining food security.Under the premise of sustainable development,the use of cultivated land is as reasonable as possible,fully understanding the soil fertility of cultivated land,promoting the development of agriculture according to local conditions,and maintaining sustainable development of cultivated land has become the top priority of my country’s future agricultural survival and development.weight.Soil fertility will continue to change with human activities,climate changes,and topographical changes.It will also change due to specific ecological,economic,and social environmental changes in the year.Therefore,the research on cultivated soil fertility should start from the systematic,integral,and systematic aspects of cultivated land.Starting from objective changes.Therefore,in the process of studying the soil fertility of cultivated land,this article must not only discuss the fertility of the cultivated land in a year,nor the spatial change,and discuss the fertility of the cultivated land at a certain point in a certain area.Muling City is a hilly area with serious soil erosion.In order to explore the soil fertility of cultivated land in Muling City,this paper selects five indicators from soil organic matter,alkali hydrolyzable nitrogen,available phosphorus,available potassium,and pH from two dimensions of time and space,and according to geostatistics.Analyzing the temporal and spatial changes of soil fertility in Muling City,the following conclusions are drawn:(1)The overall soil fertility of the cultivated land in Muling City showed a trend of steadily increasing and then decreasing.On the whole,Muling City’s Soil Fertility Composite Index was in a growing trend from 2006 to 2017,and there was a downward trend from 2017 to 2019.From a spatial point of view,the comprehensive index of soil fertility in Muling City has improved rapidly in the central and southern regions,and the upward trend is spreading from south to north.Compared with the southern regions,the northern region has changed little.(2)Although there are some deviations among the cultivated soil fertility indexes in Muling city,the variation trend is close to the overall variation trend.From the fertility index,the change trend of various fertility indicators in Muling City from2006 to 2019 deviated slightly from the comprehensive soil fertility index.Among them,soil organic matter and alkali-hydrolyzable nitrogen are in a trend of first increasing and then decreasing,soil available phosphorus is in a dynamic fluctuating trend of first increasing,then decreasing,then increasing and then decreasing,and soil available potassium is in a trend of steady increase and then decreasing.From the perspective of soil pH value,the soil in Muling City was weakly acidic,and the acidity first increased and then decreased.In 2012,the soil acidity was relatively strong,and then although the soil acidity gradually decreased,it returned to weak acidity in 2006 in 2019.From the perspective of the index space,the various indicators of each township have a large deviation,but generally still meet the trend of high in the south and low in the north.(3)The soil fertility of cultivated land is greatly affected by land use,topography,and input of pesticides and fertilizers,and less affected by climatic factors.Soil fertility is the result of multiple driving factors.This paper selects land use,topography,climatic factors,and pesticide and fertilizer input as the driving factors of soil fertility.Studies have found that forest land plays an absolute role in promoting soil fertility of cultivated land;the greater the slope of the cultivated land,the easier it is to cause soil erosion and other soil erosion,which will cause a large amount of cultivated land fertility loss and affect soil fertility;pesticides and fertilizers are used in the agricultural process One of the most direct ways to improve soil fertility has a significant impact on soil fertility.Since the fertility of cultivated land has a critical value for the input of pesticides and fertilizers,it is necessary to adapt measures to local conditions in the process of applying pesticides to cultivated land.Through correlation analysis,it is found that climate factors have little influence on soil fertility.Therefore,in the development of agriculture,Muling City should pay more attention to the issue of arable soil fertility.According to the soil fertility of arable land in different regions,the agricultural activities should be carried out according to local conditions,and some areas with weak soil fertility should be converted to forests.Engaged in agricultural planning activities from a development perspective. |
