摘要
【目的】了解炼山后火烧迹地中不同植被恢复模式下土壤团聚体酶活性特征。【方法】以宜宾市来复镇8 a生油樟(Cinnamomum longepaniculatum)、檫木(Sassafras tzumu)、香椿(Toona sinensis)、桢楠(Phoebe zhennan)人工纯林以及混交林(油樟、檫木、香椿以1∶1∶1均匀配置)等5种恢复模式为对象,研究了土壤团聚体(<0.25 mm、0.25~1 mm、1~2 mm、>2 mm)蔗糖酶、过氧化氢酶以及脲酶活性特征。【结果】①土壤团聚体各粒径比例在不同植被中:>2 mm含量最高,0.25~1 mm和1~2 mm次之,<0.25 mm最低;②不同粒径团聚体中蔗糖酶活性及过氧化氢酶活性呈现出相同的变化趋势,其大小排序为:桢楠>混交林>油樟>檫木>香椿,而脲酶活性的变化趋势为:桢楠>香椿>油樟>混交林>檫木;③土壤酶活性随着粒径的增加呈先增加后减少的趋势,1~2 mm达最高,>2 mm降低,其活性主要集中在0.25~1 mm和1~2 mm两个粒径中。【结论】火烧迹地后进行植被恢复能不同程度地提高土壤酶活性,改善其土壤质量,各林分间的差异性不显著(P>0.05),说明土壤酶活性的改善与林木种类关系不大;团聚体粒径大小对土壤酶活性具有一定影响。
【Objective】To investigate the characteristics of enzyme activity in soil aggregates in different vegetation restoration in burned areas after mountain smelting.【Method】The 8-year-old Cinnamomum longepaniculatum,Sassafras tzumu,Toonasinensis,Phoebe zhennan plantation andmixed forest(Cinnamo mum longepaniculatum,Sassafras tzumu,Toona sinensis 1:1:1 uniform configuration)and other five re covery models were targeted,and the activity characteristics of invertase,catalase and urease of differ ent aggregate sizes in soil were studied.【Result】The research results show that:①The change law of the particle size ratio of soil aggregates in different vegetations is:>2 mm content is the highest,between 40%and 50%,followed by 0.25-1 mm and 1-2 mm,the content is 10%-40%,<0.25 mm,the content changes between 1%-10%;②The invertase activity and catalase activity in aggregates of different parti cle sizes showed the same changing trend,and the order of size was:Phoebe zhennan>mixed forest>Cin namomum longepaniculatum>Sassafras tzumu>Toona sinensis(P>0.05),and the change of urease activity among forest stands The trend is:Phoebe zhennan>Toona sinensis>Cinnamomum longepaniculatum>Mixed forest>Sassafras tzumu(P>0.05);③Soil enzyme activity increases first and then decreases with the in crease of particle size.It reaches the maximum at 1-2 mm and decreases at>2 mm.Its activity is mainly concentrated in 0.25-1 mm and 1-2 mm in two particle sizes.【Conclusion】The above results show that vegetation restoration can increase soil enzyme activity and soil quality to varying degrees,but the differ ences between forest stands are not significant,indicating that the improvement of enzyme activity is not related to the types of forest trees;It has a certain protective effect,but it is affected by its particle size and the type of soil enzyme.
作者
张亚
张文静
杨礼通
雷应雪
杨丽
蔡晓林
梁清
肖玖金
ZHANG Ya;ZHANG Wenjing;YANG Litong;LEI Yingyue;YANG Li;CAI Xiaolin;LIANG Qing;XIAO Jiujin(Sichuan Provincial Key Laboratory of Forestry Ecological Engineering in the Upper Reaches of the Yangtze River,Chengdu 611130,China;Key Laboratory of State Forestry and Grassland Bureau for Forest Resources Conservation and Ecological Security in the Upper Reaches of the Yangtze River,Chengdu 611130,China;Long-termScientific Research Base for Plantation EcosystemResearch in Yuping District,West China,Chengdu 611130,China;Pengzhou State-owned Forest Farm,Pengzhou 611930,Sichuan,China)
出处
《四川农业大学学报》
CSCD
北大核心
2021年第1期79-85,共7页
Journal of Sichuan Agricultural University
基金
四川省科技计划资助(2019YJ0427,2019YJ0416)
国家自然科学基金青年科学基金资助项目(31400457)
四川省景观与游憩研究中心资助项目(JGYQ2018032)。
关键词
火烧迹地
植被恢复
土壤团聚体
酶活性
burned areas
vegetation restoration
soil aggregates
enzyme activity
