摘要
分析不同连栽代次桉树人工林土壤肥力及其障碍因子,为桉树人工林种植方式和经营方式改良提供数据支撑。文章以广西国有派阳山林场不同连栽代次(1~4代)桉树人工林为研究对象,监测其土壤pH值、有机质、大量元素及中微量元素等15个化学指标,采用分层聚类法和主成分分析法,引入土壤障碍因子诊断模型,分析桉树人工林不同连栽代次土壤肥力障碍因子。结果表明:土壤肥力障碍度在桉树连栽4代时最高,土壤肥力障碍度越高土壤肥力越低,障碍度合计值表现为连栽4代>连栽1代>连栽2代>连栽3代。从60个土壤化学性质指标中,提取出28个土壤障碍因子,其中轻度障碍因子17个,重度障碍因子11个。全氮和全钾含量在所有连栽代次中均为障碍因子,有机质、速效氮和速效钾含量在1代、2代和4代中均为障碍因子,p H值在连栽1代、3代和4代中均属重度障碍因子。桉树连栽1~4代的重度障碍因子分别为:1代为有效铁和p H值;2代为全磷、速效氮和速效钾;3代为pH值;4代为有效铁、速效氮、全磷、pH值和速效磷。因此,桉树不同连栽代次在一定程度上造成了土壤肥力退化,大量元素和中微量元素养分等级降低。
Soil fertility and obstacle factors of different successive rotation eucalypt plantations were analyzed to provide data to support improvement of planting and management of eucalypt plantations.Eucalypt plantations(of 1~4 rotations)in Guangxi Paiyangshan Forest Farm were selected as the research objects,with 15 chemical indices such as soil pH,organic matter,macro-nutrients,medium-nutrients and micro-nutrient elements being analysed.The soil obstacle factor diagnosis model was evaluated by the hierarchical clustering method and principal component analyses method.Soil fertility barrier factors in different successive rotations of eucalypt plantation were analyzed.The results showed that with increasing successive rotations of eucalypts,the highest soil fertility obstacle degree was found in the fourth successive rotation,and the higher the soil fertility obstacle degree was,the lower the soil fertility was.The total value of soil fertility obstacle degree was found to follow the order:4th rotation>1st rotation>2nd rotation>3rd rotation.From 60 soil chemical property indices evaluated,28 soil obstacle factors were identified,of which 17 were mild obstacle factors and 11 were severe obstacle factors.The soils’content of total nitrogen and total potassium were obstacle factors in all successive rotations,the contents of organic matter,available nitrogen and available potassium were obstacle factors in the 1st,2nd and 4th rotation plantations,and pH was a severe obstacle factor in the 1st,3rd and 4th rotation plantations.The severe obstacle factors of continuous planting of 1~4 rotations of eucalypts were available iron and pH,total phosphorus,available nitrogen and available potassium,pH,available iron,available nitrogen,total phosphorus,pH and available phosphorus.Successive rotations of eucalypts resulted in the degradation of soil fertility and the reduction of levels of many nutrient elements and medium and minor nutrient elements.
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;HUANG Caizhi;WANG Chunyun;LI Yuan;ZHOU Yaning;LI Zicheng;QIN Sijie;AN Bing(Guangxi ZhuangAutonomous Region State-owned Paiyangshan Forest Farm,Ningming 532500,Guangxi,China)
出处
《桉树科技》
2024年第2期48-56,共9页
Eucalypt Science & Technology
基金
广西林业科技项目(桂林科研﹝2022 ZC﹞79号
2023 GXZCLK54号和46号)。
关键词
桉树
连栽
土壤养分
土壤障碍因子
障碍度模型
Eucalyptus spp.
continuous planting
soil nutrient
soil obstacle factor
obstacle degree
