[口头报告]Effect of drainage on microbial enzyme activities and communities dependent on depth in peatland soil

Effect of drainage on microbial enzyme activities and communities dependent on depth in peatland soil
编号：3421 稿件编号：1746 访问权限：私有 更新：2023-04-15 15:11:38 浏览：659次 口头报告

报告开始：2023年05月06日 14:20 （Asia/Shanghai）

报告时间：15min

所在会议：[20] 20、地球关键带与全球变化 » [20-1] 20-1 地球关键带与全球变化

暂无文件

摘要
Water tables in high-latitude peatlands are expected to fall because of climate change, with signifificant consequences for carbon cycling in these ecosystems. At present, the understanding of how climate-induced changes will affect soil microbial communities and functions in peatlands still remains controversial. In this study, we compared the potential activities of soil oxidase and hydrolytic enzymes and microbial communities at different depths in a minerotrophic peatland, part of which had been drained for many years and part of which was natural. The results showed that the microbial communities and enzyme activities differed considerably between the drained peat and the natural peat, and that the degree of change varied by depth in the profifile. The soil oxidase activities and hydrolase activities (b-1,4- N-acetylglucosaminidase and acid phosphatase) in the oxic zone (0–10 cm) were higher in the drained peat than in the natural peat, but the b-1,4-glucosidase activities decreased in the oxic zone after drainage. Soil enzyme activities in the anoxic zone were lower in the drained peat than in the natural peat. This suggests that drainage disturbance in this peatland does not support enhanced oxidative enzyme activityas hypothesized by the ‘‘enzyme-latch’’ mechanism.The soil total phospholipid fatty acids (PLFAs) and bacterial, fungal, and actinomycetic PLFAs in the oxic zone were lower in the drained peat than in the natural peat. The total PLFAs and bacterial PLFAs were higher in the transitional zone of the drained peat than the natural peat, but remained similar in the anoxic zone of the drained and natural peat. The fungi/ bacteria and gram-positive/gram-negative ratios were
lower in the drained peat than in the natural peat. The soil bacterial communities was strongly and positively linked with the b-1,4-glucosidase activities involved in carbon transformation, whereas the fungi was positively associated with oxidase activities driving carbon oxidation. We found that these variations in the microbial communities and enzyme activities were associated with differences in the litter quality, soil organic carbon, soil moisture content, and the pH between the drained peat and natural peat. These
observations indicate a modifification in microbial communities and their activities reflflective of changing peat C cycling. The observed reduction in microbial biomass with peatland drainage appears to have also resulted in reductions in enzyme activity suggesting potential limits to the ‘enzyme-latch’ mechanism for peatland C loss following longer-term drainage.
关键字
Drainage  Hydrolytic enzymes  Oxidase  Microbial biomass  Microbial community structure
报告人
徐志伟
东北师范大学

稿件作者
徐志伟 东北师范大学
王升忠 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，长春吉林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，长春吉林130024
发表评论
验证码 看不清楚，更换一张
全部评论

联系我们

会务总协调、疫情防控：

沈焕锋（13163235536；shenhf@whu.edu.cn）

管小彬（18007973663；guanxb@whu.edu.cn）

魏秀琴（15871750333；weixiuqin@whu.edu.cn）
会场安排：

沈焕锋（13163235536；shenhf@whu.edu.cn）

李长冬（15327198910；lichangdong2008@126.com）

张 亮（15827200707；lzhang@whigg.ac.cn）

徐 鹏（13554674258；xupengwhu@whu.edu.cn）
学术安排：

王伦澈（13349889828；wang@cug.edu.cn）

庄艳华（13349889826；zhuang@apm.ac.cn）

李星华（15527964369；lixinghua5540@whu.edu.cn）
会议注册：

管小彬（18007973663；guanxb@whu.edu.cn）

赵 林（18071070948；linzhao@whu.edu.cn）
会议财务：

张传喜（13627137374；zhangchuanxi@whu.edu.cn）

石玉婷（13476286537；yutingshi@vip.qq.com）
商业赞助：

阮志敏（15871826028；ruanzm@whu.edu.cn）

黄文丽（13693626212；wenli.huang@whu.edu.cn）
会议服务，酒店预定，网站、注册系统服务：

曹雪峰（18971567453；carol@chytey.com）

金钰壹（18271358859；jinyuyi@whu.edu.cn）
会务总协调、疫情防控：
沈焕锋（13163235536；shenhf@whu.edu.cn）
管小彬（18007973663；guanxb@whu.edu.cn）
魏秀琴（15871750333；weixiuqin@whu.edu.cn）
会场安排：
沈焕锋（13163235536；shenhf@whu.edu.cn）
李长冬（15327198910；lichangdong2008@126.com）
张 亮（15827200707；lzhang@whigg.ac.cn）
徐 鹏（13554674258；xupengwhu@whu.edu.cn）
学术安排：
王伦澈（13349889828；wang@cug.edu.cn）
庄艳华（13349889826；zhuang@apm.ac.cn）
李星华（15527964369；lixinghua5540@whu.edu.cn）
会议注册：
管小彬（18007973663；guanxb@whu.edu.cn）
赵 林（18071070948；linzhao@whu.edu.cn）
会议财务：
张传喜（13627137374；zhangchuanxi@whu.edu.cn）
石玉婷（13476286537；yutingshi@vip.qq.com）
商业赞助：
阮志敏（15871826028；ruanzm@whu.edu.cn）
黄文丽（13693626212；wenli.huang@whu.edu.cn）
会议服务，酒店预定，网站、注册系统服务：
曹雪峰（18971567453；carol@chytey.com）
金钰壹（18271358859；jinyuyi@whu.edu.cn）
注册缴费 提交稿件