岷江上游中山区次生灌丛与人工油松林土壤理化性质比较研究

对岷江上游次生灌丛与人工油松林0-60cm深土壤理化性质对比测定，结果表明，人工油松林土壤容重为1．40g／m^3，比次生灌丛(1．01g／m^3)高0．39g／m^3；人工油松林自然含水量略高于次生灌丛，而人工油松林饱和含水量、毛管含水量和非毛管含水量依次为：29．1％，20．9％，11．1％，它们分别比次生灌丛低23．8％，19．1％，1．9％；次生灌丛的土壤孔隙度是53．0％，高出人工油松林21％；土壤养分所测6项指标中，人工油松林土壤养分含量普遍低于次生灌丛，K表现尤为突出，是油松林的1．81倍；人工油松林和次生灌丛pH值分别为6．23和8．39。说明在人为干扰严重的环境下，人工油松林可能有恶化土壤物理性质、降低林地肥力的趋势。

Soil Physical and Chemical Properties Under Secondary Shrub and Artificial Chinese Pine Forest in Middle-mountain Areas of Upper Reaches of the Minjiang River

Physical and chemical properties of soil under shrub-land and the artificial Chinese pine forest in the upper reaches of Minjiang River were studied. Results showed that the soil bulk density of artificial Chinese pine forest and the secondary shrub-land was 1.40 g/m³ and 1.01 g/m³, respectively. The soil water content under the artificial Chinese pine forest was higher than that under the secondary shrub-land. The saturated water capacity, capillary water capacity and no-capillary water capacity of soil under the artificial Chinese pine forest were 29.1%, 20.9% and 11.1%, respectively, which was 23.8%, 19.1% and 1.9% lower than that of the secondary shrub-land. The soil porosity under the secondary shrub-land was 53.0%, 21% higher than that under the artificial Chinese pine forest. The total soil nutrition content under the artificial Chinese pine forest was lower than that under the secondary shrub-land. The content of total K under the shrub-land was 181% of that under the artificial Chinese pine forest. The pH values under the two sites were 6.23 and 8.39, respectively. It is possible that the potential productivity of the soil under the artificial Chinese pine forest, which has been seriously disturbed by human activity, may be tending toward deterioration.