为了研究不同龄组杉木生态公益林经过改造与未改造林分的土壤肥力情况,以湖南省福寿国有林场幼、中、近熟林3个龄组杉木林为研究对象,采用层次分析法对不同龄组经营样地与对照样地的土壤肥力进行评价。结果表明,福寿林场杉木生态公益林土壤肥力评价的3个准则层因子权重分别为:土壤环境条件(0.106 2)、土壤物理性状(0.206 5)、土壤养分(0.633 3),18块样地中土壤肥力等级为差的样地有9个,9个样地均为对照样地,中等的样地8个,均为经营样地,等级为良的样地1个,无极差和优的样地,差、中等和良的样地所占比例分别为50%,44.4%和5.6%。3个龄组中土壤肥力得分为中龄林>近熟林>幼龄林,各龄组对照样地和经营样地得分情况差异显著,经营样地土壤肥力得分高于对照样地,说明通过间伐抚育,补植乡土树种能够提高土壤肥力。

In order to study the soil fertility between the transformed and untransformed stands of Cunninghamia lanceolata ecological public welfare forests in different age groups,the young,middle-aged and near mature forest of Cunninghamia lanceolata in Fushou Forest State-owned Farm of Hunan Province was taken as object of study and the Analytic Hierarchy Process(AHP) was used to evaluate the soil fertility of management plot and control plot in different age groups.The results showed that the three criteria of the soil fertility evaluation of Cunninghamia lanceolata ecological public welfare forest in Fushou Forest Farm are soil environmental conditions(0.106 2),soil physical properties(0.206 5) and soil nutrients(0.633 3). There were 9 sample plots with poor level soil fertility grades in 18 plots,all of which were control sample plots,and 8 plots were middle level,all of which were management plots,with a good level plot,there were no poor and excellent level plots,and the proportions of poor,medium and good level plots were 50%,44.4% and 5.6% respectively.The soil fertility scores of the three age groups were middle-aged forest > near-mature forest > young forest,and the scores of the control plots and the management plots of the different age groups were significantly different.The soil fertility scores of the management plots were higher than the control plots,showing that thinning and replanting of native tree species can improve soil fertility.