草本泥炭分解过程中有机碳含量和酶活性变化的模拟实验研究  

Simulation Experiment on Changes of Organic Carbon Contents and Enzyme Activity of Herbaceous Peat during Decomposition

作　　者：徐光远 赵红艳[1,2,3] 刘莎莎 徐志伟[1,2,3] 王升忠 XU Guangyuan;ZHAO Hongyan;LIU Shasha;XU Zhiwei;WANG Shengzhong(Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Sciences,Northeast Normal University,Changchun 130024,Jilin,P.R.China;Institute for Peat and Mire Research,State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Northeast Normal University,Changchun 130024,Jilin,P.R.China;Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains,Northeast Normal University,Changchun 130024,Jilin,P.R.China)

机构地区：[1]东北师范大学地理科学学院,长白山地理过程与生态安全教育部重点实验室,吉林长春130024 [2]东北师范大学泥炭沼泽研究所,国家环境保护湿地生态与植被恢复重点实验室,吉林长春130024 [3]吉林省长白山湿地生态过程与环境变化重点实验室,吉林长春130024

出　　处：《湿地科学》2020年第6期724-729,共6页Wetland Science

基　　金：国家重点研发计划项目(2016YFC0500407);吉林省科技厅自然科学基金项目(20180101002JC);延边朝鲜族自治州湿地保护发展中心项目(2017220101000913)资助。

摘　　要：为了探讨草本泥炭分解过程中其有机碳含量和酶活性的变化,于2017年5月,在吉林省敦化市东沟草本泥炭沼泽中,采集了泥炭柱样品;按照自然条件下5~10月的气温和泥炭沼泽积水情况,在实验室的培养箱中,对泥炭柱样品进行模拟培养,实验时间为2017年5月5日~10月25日;在模拟培养过程中,在每月中旬从泥炭柱上取样,测定草本泥炭样品中的有机碳含量、有机组分含量以及多酚氧化酶、过氧化物酶和β-葡萄糖苷酶活性。研究结果表明,在实验期间,0~40 cm深度泥炭样品中的有机碳含量总体上在减小,40~50 cm深度泥炭样品中的有机碳含量总体上在增大;随着培养时间延长,各深度泥炭样品中的难水解物和不水解物含量都减小,0~30 cm深度泥炭样品中的易水解物含量增大;0~30 cm深度泥炭样品中多酚氧化酶的活性在7~9月较大,30~50 cm深度泥炭样品中β-葡萄糖苷酶的活性在6~7月较大,40~50 cm深度泥炭样品中过氧化物酶的活性在整个实验期间都相对较大。In order to reveal the changes of organic carbon and enzyme activities in herbaceous peat during decomposition,a peat monolith was collected from Donggou peat bog of Dunhua city,Jilin province in May of 2017.According natural air temperature and depth of flooding in peat bog from May to October,the peat monolith was incubated in the incubator from May 5 to October 25,2017.Samples were collected from the peat monolith in mid month during the incubation period.Contents of organic carbon,organic components and enzyme activities of polyphenol oxidase,peroxidase andβ-Glucosidase of peat samples were measured.The results showed that contents of organic carbon in the peat samples at 0-40 cm depth decreased,and contents of organic carbon in the peat samples at 40-50 cm depth increased during the experiment.With the extension of decomposition time,contents of refractory-hydrolyzed and non-hydrolyzed substances in the peat samples at each depth decreased,and contents of easily hydrolyzed substances in the peat samples at 0-30 cm depth increased.The activities of polyphenol oxidase in the peat samples at 0-30 cm depth were strong from July to September.The activities ofβ-Glucosidase in the peat samples at 30-50 cm depth were strong from June to July.The activities of peroxidase in the peat samples at 40-50 cm depth were strong during the experiment.

关 键 词：草本泥炭 分解 有机碳 酶活性 泥炭沼泽 

分 类 号：S154.2[农业科学—土壤学]