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掌握沙地的动态变化趋势,准确了解气候条件和社会经济因素对沙地的影响规律,对沙地的保护和治理至关重要.运用1994年、2001年、2014年夏季的三期Landsat遥感影像,基于GIS和Logistic回归模型分析浑善达克沙地动态变化过程及其驱动力.研究结果表明:1994-2001年,固定沙地和湿地年变化率为-2.61%和-0.75%,半固定沙地和裸沙地年变化率分别为5.54%和18.83%,浑善达克沙地呈现退化的趋势;固定沙地减少的驱动力是降雨量和放牧强度,Logistic回归的贡献率分别为51.31和24.22;裸沙地增加的主要驱动力是放牧强度和气温,贡献率分别为29.45和38.76;湿地面积减少主要受第一产业的影响,贡献率为40.90.2001-2014年,固定沙地和半固定沙地年变化率分别为0.36%和1.23%,裸沙地和湿地的年变化率分别为-4.56%和-1.20%,研究区沙地总体呈现好转的趋势;放牧强度的控制和政府的治理对沙地质量的好转起到了主要作用;湿地面积减少主要受风速、气温等自然因素和以放牧为主的人为因素共同影响.总体上,放牧对沙地的影响较大且长期存在,应继续通过草蓄平衡等政府治理措施来改善沙地的质量.
Grasping the trend of the dynamic change of sandy land and accurately understanding the impact of climatic conditions and socio-economic factors on the sandy land are of crucial importance for the protection and governance of the sandy land. Using Landsat remote sensing images of the three phases of 1994, 2001 and 2014 , And analyzed the dynamic process and driving forces of Hunshandake Sandy Land based on GIS and Logistic regression model.The results showed that the annual change rates of fixed sandy land and wetland were -2.61% and -0.75% from 1994 to 2001. Semi-fixed The annual rates of change of sandy land and bare sandy land were 5.54% and 18.83%, respectively, and Hunshandake desert was degraded. The driving force for the reduction of fixed sandy land was rainfall and grazing intensity, and the contribution rates of Logistic regression were 51.31 And 24.22 respectively. The main driving force for the increase of bare sandy land was grazing intensity and temperature, with contribution rates of 29.45 and 38.76 respectively. The decrease of wetland area was mainly affected by the primary industry, with a contribution rate of 40.90. In 2001-2014, The annual change rates of semi-fixed sandy land were 0.36% and 1.23%, respectively. The annual change rates of bare sandy land and wetland were -4.56% and -1.20%, respectively. The overall sandy land in the study area showed a turnaround trend. The grazing intensity control and government Improvement of the quality of the sand from the rise The main reason is that the decrease of wetland area is mainly affected by natural factors such as wind speed and air temperature and human factors mainly based on grazing.Overall, grazing has a long-term impact on sandy land and should continue to be controlled by government such as grass balance Measures to improve the quality of the sand.