Relationship of benggang number, area, and hypsometric integral values at different landform developmental stages
Relationship of benggang number, area, and hypsometric integral values at different landform developmental stages
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DOI：
10.1002/ldr.3571
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发表时间：
2020-04-07
影响因子：
4.7
通讯作者：
Tang, Changyuan
中科院分区：
文献类型：
--
作者：
Liao, Yishan;Zheng, Mingguo;Tang, Changyuan
在中国南方，崩岗侵蚀造成了严重的土壤流失和土地退化。然而，其发展的机制仍不清楚。利用土壤侵蚀模型和土壤侵蚀高程积分（HI）值，研究了江西和福建两省土壤侵蚀、地形发育和崩岗开发之间的关系。崩岗数和面密度随HI的增加先增大后减小，崩岗数密度最高在HI值为0.18 ~ 0.20时，崩岗面积密度最大，为0.27 km（-2 HI值在0.14 ~ 0.16之间时，蚌岗的平均含水量为0.0016 km（2）km（-2），HI > 0.16时，蚌岗的平均含水量为78.66%。目前区域崩岗侵蚀呈加剧趋势，剥蚀速率为0.04- 5.7mm/a。各流域每年可使HI降低1 × 10 ~（-7）~ 1.03 × 10 ~（-4）。区域性崩岗活动期为2029 ~ 53999年，平均26,371年。崩岗地貌发育与崩岗演化关系密切，可分为无崩岗、历史崩岗、现状崩岗和潜在崩岗4个带。江西省崩岗侵蚀以现状崩岗为主（70.52%），福建省崩岗侵蚀以潜在崩岗为主（68.60%），未来崩岗侵蚀呈现先降后升的格局。本文的研究有助于了解崩岗地区的发展状况，并采取相应的措施加以控制。
In south China, benggang erosion causes intensive soil loss and land degradation. However, the mechanisms underlying its development remain unclear. In this study, the relationship between soil erosion, landform development, and benggang development in Jiangxi and Fujian provinces of China was investigated by using a soil erosion model and hypsometric integral (HI) values. Benggang number and area density are shown to increase first and then decrease with HI, with the highest benggang number density (0.27 benggang km(-2)) at a HI value between 0.18 and 0.20, the largest benggang area density (0.0016 km(2) km(-2)) at a HI value between 0.14 and 0.16, and 78.66% of benggang in the stage of HI > 0.16. The current regional benggang erosion shows an aggravating trend, with a denudation rate of 0.04-5.7 mm yr(-1)?reducing HI by 1 x 10(-7)-1.03 x 10(-4) per year in each watershed. The active period of regional benggang varies from 2,029 to 53,999 years with an average of 26,371 years. The landform development shows a close relationship with benggang evolution and can be divided into four zones: no benggang, historical benggang, current benggang, and potential benggang. Current benggang dominated (70.52%) in Jiangxi Province, while potential benggang (68.60%) in Fujian Province, suggesting a fall-rise pattern for this erosion in the future. This study contributes to the understanding of the regional benggang development and the adoption of corresponding measures to control it.