青藏高原冻融侵蚀敏感性评价与分析

发布时间：2018-10-13 07:07

【摘要】：冻融侵蚀是我国仅次于水蚀和风蚀的土壤侵蚀类型。青藏高原由于其海拔高、辐射强、气温低的特点,是我国冻融侵蚀较严重的区域。选择影响冻融侵蚀的5个主要因子:气温年较差、降水量、坡度、坡向、植被覆盖度进行定量研究,分析青藏高原冻融侵蚀敏感性强度及空间分布特征。结果表明:(1)青藏高原冻融侵蚀区面积为149.02× 10~4km~2,占青藏高原总面积的62.20%;冻融侵蚀敏感区的面积为56.80× 10~4km~2,中度及以上敏感区面积为27.39× 10~4km~2,占冻融侵蚀敏感区面积的48.22%;(2)冻融侵蚀敏感性空间分布差异明显,中度以上敏感区主要分布在青藏高原南部和东南部、喀喇昆仑山、祁连山、横断山区等地区。
[Abstract]:Freeze-thaw erosion is the second only soil erosion type in China after water erosion and wind erosion. Because of its high altitude, strong radiation and low temperature, Qinghai-Xizang Plateau is a serious area of freeze-thaw erosion in China. Five main factors affecting freeze-thaw erosion were selected: annual air temperature, precipitation, slope, slope direction and vegetation coverage. The sensitivity and spatial distribution of freeze-thaw erosion in Qinghai-Xizang Plateau were analyzed. The results are as follows: (1) the area of frozen and thawed erosion area of Qinghai-Xizang Plateau is 149.02 脳 10 ~ (4) km ~ (2), accounting for 62.20% of the total area of Qinghai-Tibet Plateau, the area of sensitive area of freezing and thawing erosion is 56.80 脳 10 ~ (4) km ~ (2), the area of sensitive area is 27.39 脳 10 ~ (4) km ~ (2) ~ (2), accounting for 48.22% of the area of sensitive area of freeze-thaw erosion; (2) The spatial distribution of corrosion sensitivity is obviously different. The moderately sensitive areas are mainly distributed in the south and southeast of Qinghai-Xizang Plateau, Karakoram Mountains, Qilian Mountains and Hengduan Mountains.
【作者单位】：中国科学院生态环境研究中心城市与区域生态国家重点实验室;中国科学院大学;
【基金】：国家重点研发计划项目(2016YFC0502102)资助
【分类号】：S157.1

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