By means of travel cost method (TCM), the recreation value of the forest parks on the north slope of Qinling Mountains is evaluated in the paper.

基于意愿支付假设，在广泛调查的基础上，采用旅行费用法（TCM）对秦岭北坡森林公园的游憩价值进行了测评。

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Using typical sampling method, the paper studies the composition and important value of plant species in subalpine spruce fir forest on Northern Slope of Changbai Mts.

采用典型抽样方法，对长白山北坡不同海拔高度带云冷杉林的植物种类组成及重要值进行了初步研究。

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A new method for precursory information extraction, i. e. slope difference information method is proposed in the paper for the daily mean value precursory data sequence.

针对日均值前兆数据序列，提出一种新的前兆信息提取方法，即斜率差信息法。

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