秦岭南坡青杄林、青杄—华山松—红桦混交林林地土壤特性研究

本文探讨了秦岭南坡青林及青—华山松7红桦混交林林地土壤的养分、化学性质及酶活性特点。结果表明：针阔混交林林地土壤酸性淋溶过程及物质迁移过程比青林地土壤弱；混交林明显地增加了土壤有机质及N素含量而降低了土壤有效P及有效K的含量；阳离子交换量及水解性总酸度青林地土壤比针阔混交林地高而盐基饱和度比针阔混交林地低，说明了在青林地土壤阳离子交换量中置换性酸所占比例较大而盐基离子所占比例较小；脲酶活性是针阔混交林地比青林地高而磷酸酶活性比青林地低，这与两种林地土壤中水解N及有效P含量高低是一致的。

Soil Properties of Picea wilsonii Forest and Mixed Forest of Picea wilsonii-Pinus armandi-Betula albo-sinensis on South-facing Slope of the Qinling Mountains

Nutrients, chemical properties and characteristics of enzyme activity in soil of Picea wilsonii Mast. forest and mixed forest of Picea wilsonii Pinus armandi Betula albo-sinensis, on south-facing slope of the Qinling Mountains were probed into in the paper. The acid leaching and substance migrating in soil of the mixed forest were slighter than those of the pure forest; contents of organic matter and nitrogen in soil of the mixed forest were higher than those of the pure forest significantly, yet contrary appeared in available phosphorus and available potassium; the cation exchange capacity and hydrolytic acidity in soil of the pure forest were higher than those of the mixed forest, the base saturation degree in soil of the pure forest howev-er was lower, which showed that more exchangeable acids and less base cations consisted in the cation exchange capacity of the pure forest the activity of urease in the rnixed forest was stronger that of the pure forest, but that of phosphatase was opposite, which was consistent with the state of the contents of hydrolytic nitrogen and available phosphorus in soil of the both forests.