Study On Ecological Effect Based On Land Use Change

The assessment of ecological effects based on land use changes is of great significance to safeguard ecological security.Most of the studies about ecology effects based on changing of land use,is to evaluate ecological risk or ecosystem service value singly,but less researching on the relationship between land use changing with ecological risk and ecological service value.This paper uses structural data of land type to construct the ecological risk index and ecosystem service value index,and establishes a spatial relationship among the three to reveal the impact of land use changing on ecological effects in Ganzhou District from 2010 to 2016,in order to solve the contradiction between regional economic and social development and ecological environment construction in Ganzhou,besides,providing technical support and scientific basis to ease the conflict between economic and social developmrnt and ecological environment construction in Ganzhou district.for the results showed:(1)During the period of 2010-2016,the land use change was significant in Ganzhou District,the rate of the construction land was the largest.It was mainly transferred into the cultivated land,followed by water area.The proportion of unused land was the most,and the area was decreased,which mainly converted into cultivated land.The cultivated land increased first and then decreased,but it generally showed an upward trend.During the period,the converted kind was unused landand and the transferred kind was the construction land.The area of gardens,woodlands,grasslands and water areas showed a general downward trend with little changing.(2)During the period of 2010-2016,the overall pattern of ecological risk was basically stable with strong spatial correlation in Ganzhou district.,which showing a remarkable circle structure with obvious differences in species,and the smaller the scale was,the stronger the ecological risk of spatial correlation was,the same as the remarkable and the impact of each other.The distribution area of high ecological risk area was the largest,and declined annual.And the area of low ecological risk area was also decreased year by year.Lower,higher ecological risk area increased year by year.The proportion of middle ecological risk area was the smallest and ranged little.(3)During the period of 2010-2016,the ecological system service value was declined year by year.The land use change had a strong influence on ecosystem service value in Ganzhou district,especially the expansion of construction land,squeezing water area,resulting in rapiddecreasing of high ecological service value area.The water area occupied a very important position in the ecosystem service system.Although the proportion of the water area was very small,the reduction of the water area was the main factor of the loss of ecosystem service value in Ganzhou district.The distribution area of low ESV area was the most extensive,with obvious spatial change,expanding to the west side of Chengguan Town year by year.In other ESV regions,the rate of change was not stable.(4)The correlation analysis showed that the reduction in the area of the low ecological risk area was mainly the garden land,the reduction of the area of the woodland and the grassland.The increasing of the cultivated land had resulted in the enlargement of the lower risk area.The rapid expansion of the construction land was the main factor for the increasing of the higher risk area.The unused land was converted into the cultivated land,which leaded to the area of cultivated land increasing,and the area of the high risk area was declined.The decreasing of the area of water area and the increasing of the construction land were the main factors of the decline of the ecosystem service value in Ganzhou.The high ecological risk index and the ecosystem service value index had a significant negative correlation with the spatial distribution,which showed that the expansion of ecological risk would lead to the reduction of ecosystem service value.