免耕和秸秆还田对我国土壤碳循环酶活性影响的荟萃分析  

Effects of No-Tillage and Straw Returning on Soil C-Cycling Enzyme Activities in China: Meta-Analysis

作　　者：马立晓 李婧 邹智超 蔡岸冬 张爱平[1] 李贵春[1] 杜章留[1] MA LiXiao;LI Jing;ZOU ZhiChao;CAI AnDong;ZHANG AiPing;LI GuiChun;DU ZhangLiu(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081;Beijing Key Laboratory of Biodiversity and Organic Farming,College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193)

机构地区：[1]中国农业科学院农业环境与可持续发展研究所,北京100081 [2]中国农业大学资源与环境学院生物多样性与有机农业北京市重点实验室,北京100193

出　　处：《中国农业科学》2021年第9期1913-1925,共13页Scientia Agricultura Sinica

基　　金：国家自然科学基金面上项目(41671305)。

摘　　要：【目的】探讨免耕和秸秆还田措施对我国农田土壤碳循环酶活性的影响,为有机物质转化和土壤健康提升提供科学依据。【方法】通过文献搜集,获得了目标文献56篇,建立了翻耕清茬(CT,507组)、翻耕+秸秆还田(SR,305组)、免耕(NT,291组)和免耕+秸秆还田(NTS,122组)处理对土壤碳循环酶(转化酶、纤维素酶、β-葡萄糖苷酶和多酚氧化酶)活性影响的数据库。采用数据整合(Meta-analysis)和增强回归树(BRT)的分析方法,探讨不同管理措施下土壤碳循环酶活性的差异,并量化气候特征、土壤特性和种植制度等因子对其影响程度。【结果】与CT相比,SR(28.0%)、NT(13.7%)和NTS(23.2%)处理显著增加(P<0.05)了土壤碳循环酶活性;SR、NT和NTS处理显著促进了转化酶活性,增幅分别为25.3%、16.2%和22.5%;SR处理对纤维素酶活性的增幅为36.6%。对于低土壤有机碳(SOC<10 g·kg^(-1))而言,SR、NT和NTS处理对转化酶活性增幅分别为26.7%、24.2%和37.9%。在碱性(pH>7.5)土壤中,SR和NTS处理下转化酶活性分别增加了22.3%和28.7%。对于不同黏粒含量的土壤而言,黏粒含量<20%的土壤中SR和NT处理下转化酶活性分别提高了21.5%和22.3%;黏粒含量为20%—30%的土壤中SR、NT和NTS处理下转化酶活性增幅分别为26.1%、16.1%和25.3%。干旱指数较大(2—3.5和>3.5)时,SR(29.1%和20.5%)、NT(13.4%和17.0%)和NTS(9.0%和36.9%)处理均显著提高了转化酶活性。对于轮作种植制度而言,SR和NTS处理促进了转化酶活性,增幅分别为24.0%和29.4%;而在连作种植制度下,SR处理下转化酶活性提高了29.4%。对于不同试验年限而言,NTS处理对转化酶活性的提高幅度表现为:长期(>10年;39.9%)>中期(5—10年;31.7%)>短期(<5年;17.6%);短期和中期秸秆还田(SR)均显著增强了转化酶活性,增幅分别为22.0%和27.3%。免耕和秸秆还田对转化酶活性的交互作用在SOC含量低(<10 g·kg^(-1))、pH呈碱性(>7.5)、黏粒含量低(<2【Objective】The objectives of this study were to assess the effects of no-tillage and straw returning on C-cycling enzyme activities in China,so as to provide some insights into organic matter transformation and soil health improvement.【Method】Based on 56 peer-reviewed papers in China,the database related to soil C-cycling enzyme activities(i.e.,invertase,cellulase,β-glucosidase and polyphenol oxidase)under conventional tillage(CT,507 sets),conventional tillage+straw returning(SR,305 sets),no-tillage(NT,291 sets)and no-tillage+straw returning(NTS,122 sets)were constructed.By using meta-analysis and boosted regression tree(BRT)model,the effects of tillage and residues management practices on the soil C-cycling enzyme activities,and quantified the relative contribution of some variables(i.e.,climate,soil properties,planting systems and duration)regulating the invertase activities were analyzed.【Result】Compared with CT,the overall C-cycling enzyme activities under SR,NT and NTS soils were enhanced by 28.0%,13.7%,and 23.2%,respectively.Specifically,the invertase activity was increased by 25.3%in SR and 16.2%under NT and 22.5%under NTS relative to CT.In addition,the cellulase activity in SR soil was higher by 36.6%than that in CT soil.In the soils with lower organic carbon concentration(SOC<10 g·kg^(-1)),SR,NT and NTS enhanced invertase activity by 26.7%,24.2%and 37.9%,respectively.In the soils with higher soil pH(>7.5),the invertase activity was higher by 22.3%under SR and 28.7%under NTS,respectively.Considering the soil texture,the invertase activity in soils with lower clay content(i.e.,<20%)was increased by 21.5%under SR and 22.3%under NT.Instead,this invertase activity in soils with moderate clay content(20%-30%)under the SR,NT and NTS was higher by 26.1%,16.1%and 25.3%,respectively,relative to CT.In the regions with higher aridity index(2-3.5 and>3.5),the enhanced invertase activity was observed in the SR(29.1%and 20.5%),NT(13.4%and 17.0%)and NTS(9.0%and 36.9%)treatments.The application of SR and NT

关 键 词：免耕 秸秆还田 碳循环酶 转化酶 荟萃分析 增强回归树 

分 类 号：S154.2[农业科学—土壤学] S141.4[农业科学—农业基础科学]