土壤肥力评价 meaning in English
fertility evaluation
Examples
- Based on the principle of significant effect of soil fertility factors on forest growth , soil physical factors ( natural water content , bulk density , total porosity , capillary porosity , aggregate degree , coarse silt and physical clay ) , chemical factors ( om . total n , alkali - hytrolyzable n , total p , humus and ha / fa ) and biological factors ( urease , acidphosphotase , invertase and microbes ) were selected as evaluation index system of soil fertility . applying principal component analysis , soil ifi of subalpine coniferous forest was calculated
从土壤物理、化学、生物学三方面出发，建立了川西亚高山针叶林不同演替阶段土壤肥力评价指标体系，应用主成分分析，计算出不同演替阶段土壤肥力综合指标值( ifi ) ，各演替阶段大小顺序为： 10年生云杉林地迹地原始林地次生桦木林地30年生云杉林地20年生云杉林地50年生云杉林地60年生云杉林地40年生云杉林地。 - At present there are more reports on soil erosion by experts from home and abroad , but most of these reports were about simulation and research based on a single factor . there are little reports on soil erosion on entire watershed , adopted comprehensive research measures according to the principle of ecological system , especially on soil erosion from the intensive farming system on slope lands , watersheds exploited for agroforestry industry , as well as appraisal reports on soil fertility index
目前国内外学者有关水土流失的报道很多，但大多数以单一因素和模拟试验研究较多，而从生态系统角度出发，采用综合方法，在小流域尺度上研究水土流失规律较少；对小流域坡耕地综合农业措施水土保持效应和小流域综合开发利用过程中水土流失规律研究以及侵蚀土壤肥力评价的研究则更少。