关于水土保持文献数据库资料收集的探讨

<正> 水土保持是一门多学科交叉、渗透、综合性较强的学科。水土保持工作是我国大农业、国土整治中的重要内容,国家给予高度重视。国内外水土保持工作和科学研究历史悠久,进展迅速,产藏的文献资料丰富。特别是80年代以来,科学研究和学术讨论活跃,水土保持学科的核心刊物和相关刊物种类增多,文献产藏量急剧上升。为了适应科研现代化需要,及时、准确、快速地为生产和科研教学提供水土保持文献资料,

Fuzzy Compreheusive Apprisal of Moisture Modulation and Retention Function in the Forest Land of Jiuloug Mountainous Area

On the basis of positioning observation on the parameters of intercepting rainfall of forest crown, soil perme-ability, retention function of soil moisture, water withholding capacity of withered and fallen matters, by means of fuzzy mathematics, the paper gives a comprehensive appraisal of moisture modulation and reten-tion function for four kinds of forest lands in Jiulong mountainous area in Beijing. The result shows that the sequence of moisture modulation and retention function from strong to weak is Chinese pine forest, bush for-est on the heliophobic slope, bush forest on the heliophilious slope, oriental arborvitae.