不同连栽代次桉树人工林土壤肥力评价  

Soil Fertility Evaluation of Different Successive Rotations of Eucalypt Plantations

作　　者：林丽珍 付军 刘奇林 黄彩枝 王椿云 李苑 周艳玲 李子成 覃斯婕 安冰 LIN Lizhen;FU Jun;LIU Qilin;HUANGCaizhi;WANG Chunyun;LI Yuan;ZHOU Yanling;LI Zicheng;QIN Sijie;AN Bing(Guangxi Zhuang Autonomous Region State-owned Paiyangshan Forest Farm,Ningming 532500,Guangxi,China)

机构地区：[1]广西壮族自治区国有派阳山林场,广西宁明532500

出　　处：《桉树科技》2024年第1期14-19,共6页Eucalypt Science & Technology

基　　金：中央财政林草科技推广示范项目(桉树中大径级锯材培育技术推广示范);广西林业自筹科技项目(桂林科研﹝2022 ZC﹞79、2023GXZCLK54号)。

摘　　要：为评价不同连栽代次桉树人工林土壤肥力并对比其差异,为由于桉树连栽而引起的地力衰退和林分生产力下降提供参考。以广西国有派阳山林场不同连栽代次桉树人工林为研究对象,分析各代次桉树人工林土壤化学性质差异,分析不同连栽代次桉树人工林pH值、有机质含量等8个土壤化学性质指标差异,采用秩和比综合评价法、主成分分析法、因子分析法、优劣解距离法和熵值法5种方法进行土壤肥力综合评价,对比验证不同评价体系和模型,探讨长期高强度多代连栽对桉树人工林土壤肥力演变的影响。结果表明5种评价方法土壤肥力综合评价结果一致,土壤肥力从大到小排序依次为连栽第2代>3代>1代>4代,秩和比综合评价法线性回归分析模型最佳。上层土壤肥力评价值明显高于下层土壤,连栽第4代林土壤质量等级明显下降,氮、磷和钾等养分处于亏缺、不平衡状态。桉树低中代次长期连栽一定程度上易引起土壤肥力退化,主要养分元素严重缺失,高强度、大面积的单一种植模式可持续性差。This study was conducted to evaluate and compare soil fertility in different successive rotations of eucalypt plantations,so as to provide a reference for understanding soil fertility and stand productivity changes over successive rotations of eucalypt.Taking different successive rotations of eucalypt plantations in Guangxi state-owned Paiyangshan Forest Farm as the research object,the soil chemical properties in different rotations of eucalypt plantations were analyzed,and the differences of eight soil chemical properties including pH value and organic matter content in different generations of eucalypt plantations were analyzed.The rank sum ratio comprehensive evaluation method,principal component analysis method,factor analysis method,pros and cons solution distance method and entropy method were used to comprehensively evaluate soil fertility.Different evaluation systems and models were compared and verified,and the effects of long-term high-intensity multi-generation continuous loading on soil fertility development of eucalypt plantations were examined.The results showed that comprehensive evaluation results of soil fertility by the five evaluation methods provided consistent results.The order of soil fertility from large to small followed the pattern:second rotation>third rotation>first rotation>fourth rotation.Linear regression analyses of rank sum ratio comprehensive evaluation method subsequently proved to provide the best results.And,soil fertility in upper soil layers was significantly higher than that in lower soil layer.The soil quality grade in fourth rotation plantations decreased significantly relative to proceeding rotations,with nutrients such as nitrogen,phosphorus and potassium found to be in deficit and unbalanced state in this rotation.The successive short rotations of eucalypts can easily cause soil fertility degradation to a certain extent,and can result in main nutrient elements becoming depleted and decreasing to deficit levels,suggesting that high-intensity and large-area single plantin

关 键 词：桉树 连栽 土壤肥力评价 

分 类 号：S714.8[农业科学—林学]