闽北山地杉木纯林和杉阔混交林的土壤肥力

对福建省建瓯市的杉木(Cunninghamia lanceolata)纯林、杉木×枫香(Liquidambarformosana)、杉木×鹅掌楸(Lirioden-dron chinense)、杉木×桤木(Alnus cremastogyne)4种人工林样地林下土壤肥力进行测定分析,并以改进的内梅罗指数进行综合评价。结果表明,各样地的土壤均为强酸性,速效P严重缺乏;各样地土壤表层综合肥力水平均为一般,平均综合肥力水平等级均为贫瘠,强酸性土壤导致速效P缺乏是其综合肥力较低的主要原因;土壤综合肥力系数的排序为杉木×鹅掌楸>杉木×枫香>杉木纯林>杉木×桤木。该研究可为闽北山地杉木及其混交林分的培育和经营管理提供参考。

Soil fertility of Chinese fir plantation and its mixed forest with broad-leaved trees in northern Fujian

The soil fertility of Chinese fir (Cunninghamia lanceolata) pure forest, mixed forest of Chinese fir×Liquidambar formosana, Chinese fir×Liriodendron chinense, Chinese fir×Alnus cremastogyne in Jian′ou, Fujian Province were analyzed and evaluated comprehensively with improved Nemerow composite index. The results showed that the 4 plots were strongly acidic soil and seriously lack of available P. The soil fertility degrees of the surface layers of all the 4 plots were general and the average values were poor because of the strong acidic soil and lack of available P. The order of the composite soil fertility index was as follows: Chinese fir×Liriodendron chinense>Chinese fir×Liquidambar formosana>Chinese fir>Chinese fir×A.cremastogyne. The results would provide some references for cultivation and management of Chinese fir and its mixed forest in northern Fujian Province.