樟子松在河北省的塞罕坝地区具有广泛的分布,以塞罕坝坝上地区樟子松人工林为研究对象,在前期调查和实地考察基础上,针对人工林的林分情况,用典型取样的方法在千层板林场按照不同年龄设置了12块标准地,并对土壤采集、处理和实验,研究其土壤养分。结果表明:1)土壤中各种养分含量都随土层深度的变化而变化,各养分含量均随土壤深度的增加而递减,但是变异程度不同。2)土壤中各养分因子间都存在着不同程度的相关关系。pH与其他养分因子都不成显著的相关关系,即对其他养分因子的含量影响不大;速效磷只与全氮呈显著的正相关关系,与其他因子均未达到显著水平;有机质与除速效磷、pH外的其他养分因子均呈极显著的正相关关系。3)不同林龄下的樟子松人工林土壤养分由大到小的顺序为:10a以下>10～20a>40a以上>30～40a>20～30a,即土壤养分随年龄的增加呈现先降低后升高的趋势。4)除pH和速效磷外,其他几种土壤养分元素与胸径生长都达到了显著相关水平。有机质、全氮、碱解氮、全磷、全钾、速效钾与胸径的相关关系的回归方程都为多项式函数,R2的范围是0.655 7～0.866(P<0.05)。
Scotch Pine(Pinussylvestris var.mongolica)is distributed widely in Saihanba area of Hebei and there is a relatively large area and volume.On the basis of previous investigations and field trips,12 plots were set up and investigated according to different ages in the Qiancengban forest farm and by using typical sampling method.The soil was collected,treated,experimented and studied.The results showed that:(1)all kinds of soil nutrient contents varied with the depth of soil layer,and the content of soil nutrients decreased with the increase of soil depth,but the variation degree was different.(2)The correlation between the various factors in the soil was different.The correlation between pH and other nutrients were significant,namely it had little effect on other soil nutrient contents.Available phosphorus was significantly positive correlation only with total nitrogen,and with other factors did not reach significant level.Organic matter was significantly positive correlation with other soil nutrients in addition to the available phosphorus and pH value.(3)The soil nutrients from big to small order of Scotch Pine plantations was:10 years following>10-20 years>more than 40>30-40 years>20-30 years,namely soil nutrient with age increase showed a trend of decreased first and then increased.(4)The correlation between other soil nutrients and DBH had reached a significant level in addition to pH and available phosphorus.The regression equation of the correlation between the organic matter,total nitrogen,alkali solution nitrogen,total phosphorus,total potassium,available potassium,and the DBH were all polynomial functions.The range of R2 was 0.6557~0.866(P<0.05).
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