作　　者： ; ; ; ;

机构地区： 华南师范大学

出　　处： 《中国沙漠》 2005年第1期27-32,共6页

摘　　要： 根据生态基准面理论制定了海南岛西部沙漠化土地分级体系,运用遥感、野外调查和数理统计等方法,研究了海南岛西部近20a来沙漠化时空变化及其与气候变化的关系。近20a来,海南岛西部土地沙漠化总体缩小、局部反复,年均缩小6 23km2,沙漠化程度明显降低,降级率为-44.84%;气候呈增温增湿变化,出现多次异常年份。对近20a来气候变化与沙漠化的因子分析和关联度分析表明,人为活动的强度加大是海南岛西部沙漠化的主导作用,气候因子与沙漠化的关联序为:年均湿度>年均气温>大风日数>年均风速>年均降水>蒸发量,增温增湿的气候变化趋势对沙漠化逆转具有促进作用。 The theory of ecological datum plane and the classification principle were employed to establish the classification and grade system of sandy desertification lands in the west of Hainan Island. In addition, some study methods such as remote sensing, field survey and GIS were used. The desertification dynamic changes and the climatic changes during the past 20 years in the west of Hainan Island were researched. The overall temporal and spatial variation trends in the recent 20 years are that: the total area of desertification land is decreasing; the reverse trend of sandy desertification is greater than the developing trend. According to the association of temperature and precipitation, the climate was becoming warm-humid in the west of Hainan Island in recent 20 years. At last, with the method of mathematical statistics and correlativity analysis, the relationship between the temporal-spatial variations of sandy desertification and the climatic variations is researched. The results show that: the climatic factors have different correlativity with sandy desertification. The climatic factors interact and interfere with sandy desertification, thus form a feedback mechanism. In a word, the warm and humid trend of climatic exerts a fairly influence on the sandy desertification.

关 键 词： 土地沙漠化 增温 海南岛 气候因子 气候变化 关联度分析 湿度 大风 基准面 降水

领　　域： [天文地球] [农业科学] [农业科学]