桂北地区3种人工林土壤质量评价  

Effects of Three Plantations on Soil Quality in Guibei

作　　者：梁惠子 潘会彪 蒋燚[1] 邓玉华 曹顺平[1] 张泽尧 LIANG Hui-zi;PAN Hui-biao;JIANG Yi(Guangxi Forestry Research Institute,Nanning,Guangxi 530002;Guangxi State-owned Huangmian Forest Farm,Luzhai,Guangxi 545600)

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]广西壮族自治区国有黄冕林场,广西鹿寨545600

出　　处：《安徽农业科学》2023年第22期122-127,共6页Journal of Anhui Agricultural Sciences

基　　金：广西优良用材林资源培育重点实验室自主课题(2020-A-04-05)。

摘　　要：为高效培育森林资源,以广西国有黄冕林场的木荷+马尾松混交林(Ⅰ)、木荷+桉树+火力楠混交林(Ⅱ)与木荷+桉树+米老排+大叶栎混交林(Ⅲ)为研究对象,采用3种综合评价方法评价不同人工林的土壤质量。结果表明:土壤有机质、总氮、碱解氮、总磷、速效磷和全钾含量及土壤养分库综合指数、土壤肥力指数和土壤质量综合评价指数随土层加深而递减;0~20 cm土层土壤养分库综合指数表现为类型Ⅲ>类型Ⅱ>类型Ⅰ,3种类型土壤肥力综合评价等级为2级;基于主成分分析,类型Ⅱ的土壤质量(0.880)最佳,其次为类型Ⅰ(0.765)与类型Ⅲ(0.738);碱解氮能单独解释土壤质量指数变异的93.1%。3种评价方法结论不尽一致,总体而言,相比针阔混交林,阔叶混交林有利于提高土壤养分含量和土壤综合肥力质量,碱解氮是影响土壤质量最主要的限制因子之一,造成了不同人工林土壤质量综合评价结果的差异。In order to rationally utilize forest resources,three comprehensive evaluation methods were used to evaluate the soil quality of different plantations in the mixed forest of Schima superba+Pinus massoniana(I),mixed forest of Schima superba+Eucalyptusrobusta Smith+Michelia macclurel(II)and mixed forest of Schima superba+Eucalyptusrobusta+Mytilaria laosensis+Quercus griffithii(III)of Guangxi state-owned Huangmian forest farm as the research objects.The results showed that the contents of soil organic matter,total N,alkaline N,total P,available P and total K,as well as the comprehensive index of soil nutrient pool,soil fertility index and soil quality comprehensive evaluation index decreased with the deepening of soil layer.The comprehensive index of soil nutrient pool in the 0-20 cm soil layer was shown as Type III>Type II>Type I,and the comprehensive evaluation grade of soil fertility of the three types was grade 2.Based on principal component analysis,the soil quality of forest type II(0.880)was the best,followed by forest type I(0.765)and type III(0.738).Alkaline N alone explained 93.1%of the variation in soil quality index.Compared with coniferous and broad-leaved mixed forests,broadleaf mixed forests were conducive to improving soil nutrient content and soil comprehensive fertility quality,alkaline N was the most important limiting factor affecting soil quality,resulting in the difference in comprehensive evaluation of soil quality in different plantations.

关 键 词：人工林 土壤养分库 土壤肥力质量 土壤质量评价 

分 类 号：S714.8[农业科学—林学]