bottom segment
2.The results indicated that the REE tracer technology has high precision to quantify the spatial-temporal process of soil erosion; In earlier rainfall course, the development degree of sheet and nil erosion was general equation; Otherwise in the following course, the rill erosion was dominant in the total erosion, its average erosion acceleration and the average erosion rate was 15 and 9 times of sheet erosion, respectively; In the end of experiment, the rill erosion took up 90% of total erosion amount; The section of slope bottom occupying about 1/3 slope area was active erosion segment in this experiment.
6.This paper is based on practical drilling data of drilled irruptive rock body in western Sha Ⅲ segment of Huimin Depression, rock body subfacies in this phrase and seismic, electric logging features in pyrolysis metamorphic belt are analyzed, so as to summarize a set of practical methods, which identify drilled various subfacies and irruptive rock top and bottom boundary by cuttings log and drill time logging.

