林下植被去除对杉木人工林土壤酶活性及其化学计量比的影响  

Effects of Understory Vegetation Removal on Soil Hydrolytic Enzyme Activity and Stoichiometric Ratio of Chinese Fir Plantation

作　　者：刘仁 袁小兰[2] 刘俏 张春阳 郭春兰[1] 陈伏生[1] 王辉民[3] 李建军[1] LIU Ren;YUAN Xiao-lan;LIU Qiao;ZHANG Chun-yang;GUO Chun-lan;CHEN Fu-sheng;WANG Hui-min;LI Jian-jun(Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed,School of Forestry,Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China;Nanchang Business College of Jiangxi Agricultural University,Nanchang 332020,Jiangxi,China;Key Laboratory of Ecosystem Network Observation and Simulation,Institute of Geographic Sciences and Resources,Chinese Academy of Sciences,Beijing 100101,Beijing,China)

机构地区：[1]江西农业大学林学院,鄱阳湖流域森林生态系统保护与修复国家林业和草原局重点实验室,江西南昌330045 [2]江西农业大学南昌商学院,江西南昌332020 [3]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室,北京100101

出　　处：《林业科学研究》2020年第5期121-128,共8页Forest Research

基　　金：国家自然科学基金重点项目(31930070,31760200);国家自然科学基金(青年)(31901197);江西省5511优势科技创新团队人才计划项目(20165BCB19006);江西省教育厅科学技术研究项目(GJJ180180);江西省自然科学基金项目(20181BAB214014)。

摘　　要：[目的]通过对比杉木人工林林下植被去除与保留的土壤理化性质和酶活性特征,探讨林下植被管理对杉木人工林土壤质量的影响。[方法]以亚热带杉木人工林为研究对象,采用配对试验设计,对8块样地进行林下植被保留(UP)和林下植被去除(UR)2种处理,测定土壤的理化性质和5种水解酶活性,计算土壤养分-酶化学计量比,并进一步分析土壤理化性质与酶活性及其化学计量比的相关性。[结果]林下植被去除显著降低土壤腐殖质层、0~5 cm、5~10 cm土层的含水量(SWC)、有机碳(SOC)、总氮(TN)、总磷(TP)、铵态氮(NH4+-N)和硝态氮(NO3--N)养分含量,也抑制了0~5、5~10 cm土层的半纤维素酶(CB)和亮氨酸基肽酶(LAP)活性,林下植被去除与保留均对酸性磷酸酶(AP)活性影响不显著。5种土壤水解酶活性以及化学计量比与SWC、SOC、TN、TP、有效氮和养分化学计量比均呈显著或极显著相关,且土壤的C、N、P水解酶活性之间呈极显著正相关,ln(BG+CB)/ln(NAG+LAP)、ln(BG+CB)/ln(AP)和ln(NAG+LAP)/ln(AP)分别与土壤C/N、C/P和N/P呈极显著正相关。[结论]林下植被去除降低了土壤水分、全量养分、有效养分含量和酶活性(CB、LAP),且土壤水分、养分及其化学计量比与酶活性及其化学计量比的关系极为密切,这些指标可能是影响土壤酶活性及其化学计量比的重要因子。[Objective] By comparing the characteristics of soil physical and chemical properties and enzyme activity of understory vegetation removal and retention in the Chinese fir(Cunninghamia lanceolata) plantation to study the effect of understory vegetation management on the soil quality of Chinese fir plantation. [Method] Taking subtropical Chinese fir plantation as the research object, and by using a paired test design, two plots of understory vegetation retention(UP) and understory vegetation removal(UR) were treated on 8 plots to determine the physical and chemical properties of the soil and the activities of five hydrolase. The soil nutrient-enzyme stoichiometric ratio was calculated, and the correlation between soil physical and chemical properties and enzyme activity and its stoichiometric ratio were analyzed. [Result] The understory vegetation removal significantly reduced the water content(SWC),organic carbon(SOC), total nitrogen(TN), total phosphorus(TP), ammonium nitrogen(NH4+-N) and nitrate nitrogen(NO3--N) nutrient contents in soil humus layer, 0-5 cm and 5-10 cm soil layers and also inhibited the cellobioside(CB) and leucine aminopeptidase(LAP) enzyme activity of 0-5 cm and 5-10 cm soil layers. Understory vegetation removal and retention had no significant effect on acid phosphatase(AP) enzyme activity. The activities and stoichiometric ratios of the five soil hydrolyzing enzymes were significantly or very significantly correlated with SWC,SOC, TN, TP, available nitrogen and nutrient stoichiometric ratios, and the soil C, N and P hydrolase activities were extremely significant positive interrelated. The ln(BG+CB)/ln(NAG+LAP), ln(BG+CB)/ln(AP) and ln(NAG+LAP)/ln(AP) were respectively related to soil C/N, C/P and N/P which showed a very significant positive correlation. [Conclusion] Understory vegetation removal will reduce soil moisture, total nutrients, available nutrients and enzyme activity(CB, LAP). The nutrients and their stoichiometric ratio are closely related to enzyme activity and its stoichiomet

关 键 词：林下植被 酶活性 酶化学计量比 杉木人工林 

分 类 号：S714.3[农业科学—林学] S791.27