赣南地区不同植被覆盖下红壤抗冲性动态研究

选取赣南地区不同植被覆盖下的花岗岩、红砂岩、第四纪红黏土发育形成的红壤为研究对象，利用原状土冲刷水槽法研究红壤的抗冲性。试验结果表明:（1）赣南地区不同植被覆盖下土壤在抗冲过程初期抗冲系数缓慢增大，然后随冲刷时间延长呈波浪式变化。从总体趋势分析，在整个冲刷过程中抗冲系数随时间呈逐渐增强的趋势；（2）以裸地来比较不同母质发育的红壤的抗冲系数，从小到大的顺序是花岗岩土壤 < 红砂岩土壤 < 第四纪红色黏土；（3）植被通过根系增强了土壤的抗冲性能，不同植被覆盖的土壤抗冲性一般表现为以下规律:裸地 < 灌草地 < 林草地。探讨赣南红壤抗冲性的动态规律以及母质和植被对土壤抗冲性的影响，为完善土壤抗侵蚀的理论研究提供了基础数据，对于更有效地控制水土流失、保护和改善生态环境具有理论和实践意义。

Research on the Dynamic Change of Anti-Scourability of Red Soils Under Different Vegetation Covers in Gannan Area

The red soils in Gannan formed from the granite, red sandstone and quaternary red clay under different vegetation had been selected as study site. The tests of anti-scourability were conducted on the undisturbed soil. The results were shown as follows. (1) the dynamic change of the red soil anti-scourability under different vegetation in Gannan area had two stages: soil anti-scourability increased slowly at the first stage, followed by change of wave form along with the scouring time at the second stage. And it all accorded with the law that anti-scourability increased gradually with scouring time; (2) the order of anti-scouribility on the bare land was granite soil