不同连栽代次的巨桉（Eucalyptus grandis）人工林土壤酶活性及其与土壤理化性质的关系  

Soil enzyme activities and their relationships to soil physicochemical properties in different successive rotation plantations of Eucalyptus grandis

作　　者：魏圣钊 李林 骆晓 谭靖星[1,2] 刘雄 刘行 杨帅 曹芹[1] 黄从德 WEI Shengzhao;LI Lin;LUO Xiao;TAN Jingxin;LIU Xiong;LIU Xing;YANG Shuai;CAO Qin;HUANG Congde(College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;Sichuan Forestry Investigation and Design Institute,Chengdu 610000,China)

机构地区：[1]四川农业大学林学院,成都611130 [2]四川省林业勘察设计研究院,成都610000

出　　处：《应用与环境生物学报》2019年第6期1312-1318,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目（41201296）;国家“十二五”科技支撑计划项目（2010BACO1A11）;长江上游生态安全协同创新中心开放基金项目资助~~

摘　　要：土壤酶是评价土壤环境质量的指示指标.土壤理化性质决定了酶促反应的底物和环境,研究不同连栽代次的巨桉人工林土壤酶活性与土壤理化性质的关系,对于巨桉人工林系统的可持续经营具有重要作用.2016年7月,采用时空互换法,以四川省青神县第一、二和三代巨桉(Eucalyptus grandis)人工林和对照马尾松(Pinus massoniana)林为研究对象,研究了不同连栽代次的巨桉人工林土壤酶活性及其与土壤理化性质的关系.结果表明:与马尾松林相比,一代巨桉林土壤脲酶、多酚氧化酶和过氧化氢酶活性显著增加,蔗糖酶、酸性磷酸酶和过氧化物酶活性无显著变化.但随巨桉连栽代次增加,土壤蔗糖酶、脲酶、酸性磷酸酶、多酚氧化酶、过氧化氢酶和过氧化物酶活性递减.冗余分析表明,土壤容重、pH、有机质、全磷对不同代次的巨桉人工林土壤酶活性影响显著,其中全磷是土壤酶活性最重要的影响因素,能解释酶活性变异的60%.全氮对土壤酶的整体影响不显著,仅能解释土壤酶活性变异的20.5%.但相对重要性分析进一步表明,土壤全氮对脲酶和多酚氧化酶存在显著的影响.研究结果说明巨桉连栽通过影响土壤理化性质进而改变了土壤酶活性.(图3表6参35)Soil enzymes are indicators for evaluating soil environmental quality.Soil physicochemical properties determine the substrate and environment for enzymatic reactions.Studying the relationship between soil enzyme activities and soil physicochemical properties in different successive rotation plantations of Eucalyptus grandis is very important for sustainable management of these plantations.In July 2016,we chose the first,second,and third rotation plantations of E.grandis and Pinus massoniana in Qingshen County,Sichuan Province,as study areas.Soil enzyme activities and their relationships with soil physicochemical properties in different successive rotation plantations of E.grandis were studied using the space-time interchange method.The results showed that compared with the P.massoniana forests,the activities of urease,polyphenol oxidase,and catalase in the first rotation plantations of E.grandis were significantly higher,although the activities of invertase,acid phosphatase,and peroxidase did not differ significantly.However,with the increasing continuous planting of E.grandis,the activities of soil invertase,urease,acid phosphatase,polyphenol oxidase,catalase,and peroxidase decreased.Redundancy analysis showed that soil bulk density,pH,organic matter,and total phosphorus significantly affected soil enzyme activities in different successive rotation plantations of E.grandis.Soil total phosphorus was the most important factor affecting soil enzyme activity,which could explain 60%of the variation in soil enzyme activity.Total nitrogen did not have a significant effect on the soil enzymes,and only 20.5%of the variation of soil enzymes activity could be explained by the redundancy analysis,although the relative importance analysis showed that soil total nitrogen had a significant effect on the activities of urease and polyphenol oxidase in E.grandis plantations.These results indicated that soil physicochemical properties could play an important role in continuous cropping processes in E.grandis plantations by regulat

关 键 词：巨桉人工林 连栽 土壤酶活性 土壤理化性质 冗余分析 相对重要性分析 

分 类 号：S714.3[农业科学—林学]