The Diversity of Soil on Uphill and Downhill of Woodland and its Influence on Growth of Trees;

林地上下坡土壤的異質(zhì)性及其對樹木生長的影響

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.

為了研究連續(xù)下坡道路的坡度、坡長與事故的關(guān)系,采集了5條典型連續(xù)下坡路段(總長度為76。