不同发育阶段杉木人工林土壤肥力分析

摘要

[Objective] To investigate the dynamics of soil fertility at different development stages (young forest,middle aged forest and mature forest) of Chinese fir (Cunninghamia lanceolata) plantations.[Method] The soil fertility level at different development stages in Chinese fir plantation located at central and south China was investigated using fuzzy mathematical evaluation and principal compoment analysis.[Result]The results showed that the age of plantation had a significant impact on forest soil and its physical and chemical properties.Moreover,at each age there were significant differences (p ＜0.001) in soil properties between topsoil and subsoil.The correlation analysis revealed significant relation between water quality and soil physical proerties.The organic matter,pH value also showed a significant relationship with soil chemical properties.The results of principal component analysis and fuzzy evaluation method indicated that the fertility level of Chinese fir plantations at northern Fujian hilly area followed the order of mature forest ＞ young forest ＞ middle aged forest.[Conclusion]With the growth of trees,it is needed to restore fertility by fertilizing,thinning and other manual intervention in order to satisfying the demand of Chinese fir for fast-growing.%[目的]研究不同发育阶段(幼龄林、中龄林、成熟林)对杉木人工林土壤肥力的影响,为揭示杉木地力衰退的原因提供依据.[方法]通过对南方杉木中心产区不同发育阶段杉木人工林土壤理化性质的测定,利用数学模糊评价和主成分分析2种方法,综合比较不同发育阶段杉木人工林土壤肥力.[结果]不同发育阶段对人工林土壤物理、化学性质均有显著影响.在同一发育阶段中,杉木人工林表层土与底层土之间存在差异(p＜0.001);土壤质量含水量对土壤物理性质具有显著指示作用,有机质、pH值与土壤养分指标呈显著相关;主成分分析和模糊评价方法均得出不同发育阶段杉木林土壤肥力呈现幼龄林＞成熟林＞中龄林的规律.[结论]随着杉木栽植时间的增长,需要采取施肥、间伐等人工干预恢复地力,进而满足杉木速生需求.