Spatiotemporal evolution of cultivated land production-ecological effects in Hotan Region
Cultivated land makes significant contribution to the land use of arid areas.Analyzing the spatiotemporal evolution of its production-ecological effects can reveal the role of cultivated land changes in regional food production and ecological environmental protection,and provide a reference for achieving synergistic production-ecological protection.Based on land use classification data from four periods during 1990,2000,2010,and 2020,we used the land use transfer matrix,production hypothesis,and remote sensing ecological index(RSEI)models to reveal production-ecological effects under spatiotemporal evolution of cultivated land in Hotan Region.From 1990 to 2020,the cultivated land area increased by 1 702.63 km2;eight counties showed the same trends with different absolute values,in cultivated land area.Reclamation of unused land,forests,and grassland were the main sources of newly cultivated land;the return of cultivated land to forests and grassland,expansion of construction land,and abandonment of cultivated land were the main reasons for decreases in the cultivated land.The level of cultivated land production increased.The proportion of unproductive cultivated land decreased by 12 percentage points and the proportion of medium and medium-high productive cultivated land increased by 14 percentage points.In terms of production effect of cultivated land,the positive effect of unchanged area production(55%)was greater than the negative effect(2%),and the transfer effect of cultivated land(43%)effectively compensated for the lost production effect area.However,the fixed negative effect area gradually increased,whereas the fixed positive effect area gradually decreased.The transfer effect area showed a fluctuating downward trend in terms of the effect of each stage.The study area is mainly dominated by level 3 ecological quality cultivated land.The ecological and environmental quality of cultivated land deteriorated over the study period,with the area of fixed cultivated land decreasing by more than twice the area of improvement,and the area of transferred cultivated land decreasing by nearly 1.4 times the area of improvement.In the phase change,the environmental quality of cultivated land improved in the first 20 years and deteriorated in the last 10 years.This deterioration was caused by the linear deterioration of the environmental quality of fixed and transferred cultivated land.The results of this study demonstrate that changes in cultivated land in the study area have contributed to an increase in regional production,which has in turn led to a gradual deterioration in the ecological quality of cultivated land.Therefore,future spatial planning and land management should emphasize the development of production-ecological integration to optimize the allocation of land resources.
cultivated landspatiotemporal evolutionhypothetical model of production levelremote sensing ecological index(RSEI)Hotan Region
国家科技期刊平台
NSTL
万方数据
维普
