季节冻融对湿地土壤有机碳矿化速率及酶活性的影响  

Effects of Seasonal Freezing-thawing on Soil Organic Carbon Mineralization Rate and Enzymatic Activity under Different Disturbance Intensities

作　　者：邹红岩 吴天 张百慧 董洪庆 李富[1] ZOU Hongyan;WU Tian;ZHANG Baihui;DONG Hongqing;LI Fu(The Faculty of science,Jiamusi University Jiamusi,Heilongjiang 154007)

机构地区：[1]佳木斯大学理学院,黑龙江佳木斯154007

出　　处：《现代农业研究》2024年第11期37-45,共9页Modern Agriculture Research

基　　金：黑龙江省大学生创新创业训练计划资助项目“冻融作用对三江平原土壤有机碳及酶活性的影响”(项目编号:201910222094)。

摘　　要：【目的】为探究季节性冻融作用对湿地土壤有机碳矿化速率及酶活性的影响,本研究选取三江平原洪河国家自然保护区内小叶章湿地、受人类活动干扰湿地和水稻田0~20cm和20~40cm土壤作为研究对象。【方法】采用室内模拟冻融的方法,探索冻融作用影响下湿地土壤有机碳矿化速率、土壤有机碳及酶活性的变化特征。【结果】实验结果显示,经过冻融循环矿化培养后,3种湿地土壤总碳的矿化率均低于0.55%,且冻融循环降低了3种湿地不同层土壤有机碳矿化总量。3种湿地土壤矿化总量均降低,表现为UDAW>DDAW>RP。冻融循环明显刺激了CH_(4)的累积释放量,在深层表现最明显。经过冻融处理的3种湿地土壤可溶性有机碳(DOC)含量高于未经冻融处理的对照(check,CK);而土壤可溶性有机碳(MBC)浓度和纤维素酶、淀粉酶、蔗糖酶活性均低于CK,且不同类型土壤表现为UDAW>DDAW>RP。【结论】冻融循环降低了湿地土壤有机碳矿化总量,但却提高了深层土壤中甲烷的矿化速率;经过冻融循环后,土壤DOC含量增加,相反却降低了土壤MBC含量和3种土壤酶活性。[Objective]In order to investigate the influence of seasonal freeze-thaw effect on soil organic carbon mineralization rate and enzyme activity in wetland,undisturbed Deyeuxia angustifolia wetland(UDDAW),disturbed Deyeuxia angustifolia wetland(DDAW),rice paddy(RP)0-20 cm and 20-40 cm soil were investigated as research objects in Sanjiang Plain Honghe National Nature Reserve.[Method]The indoor freeze-thaw simulation method was used to explore the change characteristics of soil organic carbon mineralization rate and enzyme activity under the influence of freeze-thaw action.[Results]After freeze-thaw cycle mineralization culture,the mineralization ratio of total soil carbon in the three wetlands was lower than 0.55%,and the freeze-thaw cycle reduced the total amount of soil organic carbon mineralization in different layers of the three wetlands.The total amount of soil mineralization in the three wetlands decreased,showing UDAW>DDAW>RP.The freeze-thaw cycle obviously stimulated the cumulative release of CH_(4),which was most obvious in the deep layer.The dissolved organic carbon(DOC)contents of the 3 kinds of wetland soil after freezing and thawing treatment were higher than those of the control(check,CK).The enzyme activity of MBC and the three soils was lower than that of CK,and UDAW˃DDAW˃RP was found in different soil types.[Conclusion]The freeze-thaw cycle decreased the total amount of organic carbon mineralization in wetland soil,but increased the mineralization rate of methane in deep soil.After freeze-thaw cycle,soil DOC content increased,but soil MBC content and three soil enzyme activities decreased.

关 键 词：季节冻融 湿地 矿化速率 活性有机碳 酶活性 

分 类 号：S154.1[农业科学—土壤学]