The Diversity of Soil on Uphill and Downhill of Woodland and its Influence on Growth of Trees;
林地上下坡土壤的异质性及其对树木生长的影响
In order to study the effect of gradient and length of long and steep downgrade on the traffic accidents,the data of 1276 traffic accidents which occurred in 5 different typical downgrades(76.
为了研究连续下坡道路的坡度、坡长与事故的关系,采集了5条典型连续下坡路段(总长度为76。