商洛地区不同林龄油松人工林土壤理化性质研究

为探讨林龄对油松人工林土壤理化性质的影响及二者间的关系,在陕西商洛地区设置典型样地,采用野外调查和室内测定分析相结合的方法,比较不同林龄油松人工林样地土壤理化性质的变化特征以及不同理化性质指标之间的相关性。结果表明:有机质、全氮含量及pH值在0—40cm土层深度下随林龄的增加逐渐降低,其他理化指标随林龄增加亦表现出一定的规律性;40—60cm土层下,全氮含量及pH值随林龄的增加也呈现降低趋势,而其它理化指标则未表现出规律性变化。相关性分析结果显示,有机质与全氮以及pH之间存在着显著的正相关关系,其中,全氮与pH之间相关性达到极显著水平,其他各理化指标之间则无明显的相关性。

Study on Soil Physicochemical Properties along Forest Age of Pinus tabulaeformis Plantations

In order to explore the impact of forest ages on the physicochemical characteristics of soil under pinus tabulaeformis plantation and compare the variation characteristics of the soil physicochemical characteristics under pinus tabulaeformis plantation of different forest age,typical sample zones were set in Shangluo in this study.The combination method of field investigation and laboratory analysis was adopted.The results showed that organic matter,total nitrogen and pH value reduced with the increase of the forest age among the soil depth of 0—20 cm and 20—40 cm.The other physical and chemical parameters also changed,but did not show obvious increase or decrease.Total nitrogen and pH value reduced with the increase of the forest age among the soil depth of 40—60 cm.Correlation analysis showed that there was a positive correlation between organic matter,total nitrogen and pH value,while an extremely significant correlation between total nitrogen and pH value was observed.There was no significantly correlation between the other physical and chemical propterties.