滇南典型季风常绿阔叶林土壤脲酶特征及其影响因子  

Characteristics and Influence Factors of Aoil Urease in a Typical Monsoon Evergreen Broad-Leaved Forest in Southern Yunnan

作　　者：杨值 李小英[2] 袁勇 於虎 李进曦 YANG Zhi;LI Xiaoying;YUAN Yong;YU Hu;LI Jinxi(Faculty of Modern Agricultural Engineering,Kunming University of Science and Technology,Kunming 650500,China;School of Ecology and Environment,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]昆明理工大学现代农业工程学院,昆明650500 [2]西南林业大学生态与环境学院,昆明650224

出　　处：《林业资源管理》2023年第4期71-79,共9页Forest Resources Management

基　　金：国家自然科学基金(31460191);金沙江干热河谷平沟建园地土壤贫瘠特征及改良策略(KKZ3202323005)。

摘　　要：采取野外调查和室内分析相结合的方法,系统分析了滇南典型季风常绿阔叶林土壤脲酶活性及其与土壤理化性质的关系。结果表明:1)0~<10 cm土层土壤脲酶活性[2.23 mg/(g·d)]高于10~20 cm土层[1.69 mg/(g·d)],但两土层间脲酶活性无显著性差异;2)滇南典型季风常绿阔叶林土壤脲酶活性与土壤自然含水量、总孔隙度、饱和持水量、有机碳含量、水解氮含量、全氮含量和全磷含量呈极显著正相关(P<0.01),与土壤容重、pH值和全钾含量呈极显著负相关(P<0.01);3)土壤脲酶活性的首要影响因子是土壤水分、结构因子(土壤含水量、饱和持水量、容重和总孔隙度)和土壤碳氮因子(土壤有机碳、水解氮和全氮),其次为碳氮比。滇南森林管护中应注重土壤水分和结构的管理及土壤碳素和氮素的调节。该研究可为进一步研究土壤物质循环过程奠定基础,为制定森林资源的管理措施提供参考。The characteristics ofsoil urease and its relationship with soil physical and chemical properties in typical monsoon evergreen broad-leaved forest in southern Yunnan were systematically analyzed by field investigation and indoor analysis.The results showed that:1)The urease activity in 0~<10 cm soil layer[2.23 mg/(g·24 h)]was higher than that in 10~20 cm soil layer[1.69 mg/(g·24 h)],but there was no significant difference between the two soil layers.2)Soil urease activity in typical monsoon evergreen broad-leaved forest in southern Yunnan was significantly positively correlated with soil natural water content,total porosity,saturated water holding capacity,organic carbon content,hydrolyzed nitrogen content,total nitrogen content and total phosphorus content(P<0.01),and significantly negatively correlated with soil bulk density,pH value and total potassium content(P<0.01).3)The key influencing factors of soil urease activity were soil moisture,structural factors(soil water content,saturated water holding capacity,bulk density and total porosity)and soil carbon and nitrogen factors(soil organic carbon,hydrolyzed nitrogen and total nitrogen),followed by carbon nitrogen ratio(C/N).More attention should be paid to soil moisture,structure management and soil carbon and nitrogen regulationin the forest management in southern Yunnan.This study can lay the foundation for further study of soil material cycle process and provide reference for the formulation of forest resources management measures.

关 键 词：土壤酶 物质循环 土壤水 土壤养分 碳氮比 

分 类 号：S714.2[农业科学—林学]