摘要
荒漠-绿洲过渡带对风沙防治具有重要作用。对黑河中游荒漠-绿洲过渡带斑块植被区2012—2015年风沙蚀积状况进行了连续观测,并选用风沙蚀积强度Re为评价指标对风沙蚀积状况进行了半变异函数及空间格局分析。结果表明：观测期间,风沙活动由风蚀向风积方向转变,但具体日期不能仅由风沙蚀积强度Re的频率和平均值做出判断。风沙蚀积强度Re的半变异函数理论拟合模型均为Linear模型,块金系数0.8508-0.9616,为强变异,变异主要由风、降水、动物活动、人为扰动等随机性因素引起。风沙蚀积强度Re的空间分布格局显示研究区以轻度和微度风蚀风积为主,且风蚀面积下降而风积面积增加,风沙蚀积强度的空间格局变化与区域地形、植被盖度、气象因素等有关。
Desert-oasis ecotone plays an important role in combating sand disasters.By taking the patch vegetation area of desert-oasis ecotone in the middle reaches of the Heihe River as the study area,were observed the data of wind erosion and deposition continuously from2012 to 2015.The intensity of wind erosion and deposition was selected as an index,and was employed to analyze the semi-variance function and spatial distribution of wind erosion and deposition.The results show that the sand movement changed from wind erosion to wind deposition during the observation period,but the specific date of the conversion was uncertain,which couldn＇t be judged only by the frequency and mean of intensity of wind erosion and deposition.The semi-variable function models of intensity of wind erosion and deposition from2012 to 2015 were all linear models,and its nugget coefficients changed between0.8508 and0.9616 with the characteristic of strong variations,which was caused by the random factors,such as wind,precipitation,animal＇s movement,human disturbance,etc.The spatial pattern of intensity of wind erosion and deposition was mainly displayed as mild and micro-degree status,and wind erosion area decreased but wind deposition area increased.The spatial pattern change of wind erosion and deposition was correlated with regional terrain,vegetation coverage,meteorological factor,etc.
出处
《中国沙漠》
CSCD
北大核心
2016年第6期1547-1554,共8页
Journal of Desert Research
基金
国家自然科学基金项目(41561102
41161082)
关键词
荒漠-绿洲过渡带
风沙蚀积强度
半变异函数
空间格局
desert-oasis ecotone
intensity of wind erosion and deposition
semi-variance function
spatial pattern
