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1·Headward erosion is main cause of river captrue, but it is not only;

溯源侵蚀是河流袭夺的主因，但不是唯一原因；

2·The change of ephemeral gully headward erosion, gully-wall collapsing and deep-cutting erosion were quantified in the three stages of initial-phase, metaphase and anaphase.

阐明了在浅沟发育初期、中期和后期三个发育阶段，沟头溯源侵蚀、沟壁扩展和沟床下切侵蚀变化规律。