黄土高原土壤干层评定指标的改进及分级标准

土壤干层是黄土高原普遍存在的特殊土壤水文现象,研究其现状、成因、防治、调控措施等对科学认识区域植被承载力、土地生产力以及低效林草改造和可持续植被建设等有重要理论与生产指导意义,而合理通用评判指标与分级标准是开展土壤干层研究的基础。目前黄土高原土壤干层尚无统一评判指标与分级标准,给区域土壤干层研究带来困难。本文在已有研究成果的基础上,提出用土壤有效水饱和度/不饱和度作为土壤干层评判指标,并给出其分级标准。该评判指标计算简单,具通用性和可比性,可望成为土壤干层的通用评判指标。

Assessing Indicator of Dried Soil Layer on Loess Plateau and Broken Values

Dried soil layer is a universal and special soil hydrological phenomenon on Loess Plateau.Studying the state,reason and controlling measures of dried soil layer has much significance to regional plant capability,land productivity and rectification of low-functional forest and grassland and construction of sustainable plant.A universal assessing indicator of dried soil layer and reasonable broken values is the basis of dried soil layer study.Yet till now there is not a general assessing indicator and reasonable broken values,as results in the difficulty of the study on regional dried soil layer.Saturation or non saturation of soil available water was suggested to be an assessing indicator in this paper,and some broken values was also given based on the summarization of the present results.Calculation of saturation of soil available water calculates is simple and the indicator can be a universal assessing method.