根溪河小流域的崩岗特征及其治理措施

长汀县河田镇根溪河小流域是福建水土流失最严重的地区之一，存在不同程度的崩岗131个。分析了河田根溪河小流域崩岗的形态特征、发育阶段和活动情况。研究表明，崩岗的形成和发展与深厚的花岗岩风化壳、土壤特性、植被覆盖、小气候条件及人类活动等密切相关。提出了崩岗治理的基本思路和治理措施。经治理后沟道和坡面的植被覆盖率由原来的26％和28％分别提高到68％和76％；土壤侵蚀模数下降至3175t／km^2a，与未治理的崩岗相比降低了89．6％。

Slump gully characteristic of small watershed of Genxi River and its control measures

The small watershed of Genxi River is one of the most serious regions of soil erosion in Changting County, Fujian. There are 131 slump gullies with different destructive degrees in this area. The form characteristics, growth stage and activity situation of slump gullies in small watershed of Genxi River, were analyzed. The research indicated that the formation and development of slump gullies are closely connected with the deep-layer weathering shell of granite, soil properties, vegetation coverage, microclimate condition and human activities. The fundamental train of thoughts and control measures in controlling slump gullies are put forward. After the control, the ratio of vegetation coverage in gully and slope has been separately raised from 26% and 28% to 68% and 76%. Compared with the uncontrolled slump gully, erosive modulus of soil in controlled slump gully has decreased by 89.6%.