摘要
水文条件是排水泥炭沼泽恢复过程中最重要的环境要素,而微生物释放的酶是土壤有机质分解的重要功能性物质。本研究以白江河泥炭沼泽为对象,于2020年6月,采集自然区、排水区和两个水位恢复区的0~50 cm土壤样品,测定其土壤理化性质及2种氧化酶(过氧化物酶和多酚氧化酶)和3种水解酶(β-1,4-葡萄糖苷酶、β-1,4-N-乙酰葡糖胺糖苷酶和酸性磷酸酶),揭示水位恢复过程中土壤酶活性的变化特征及其影响因子,为退化泥炭沼泽的恢复工作提供数据支撑。结果表明:恢复区土壤多酚氧化酶和过氧化物酶活性均显著低于排水区,而水解酶活性表现为仅恢复区0~10 cm土壤β-1,4-葡萄糖苷酶和β-1,4-N-乙酰葡糖胺糖苷酶活性显著低于排水区。自然区土壤酶活性变化主要受土壤含水量的影响,而排水区土壤酶活性主要受土壤pH、全氮和全磷含量的影响。恢复区土壤酶活性的变化受土壤养分和含水量共同控制。水位恢复对土壤酶活性的影响取决于土壤深度,并且水位恢复改变了土壤酶活性的影响因素。
Hydrological condition is important for the restoration of drained peatland by affecting both plants and microorganisms.Soil enzymes released by microorganisms are strongly associated with the decomposition of soil organic matter.It is therefore important to understand the impacts of hydrological condition on soil enzyme activities.To reveal the variation patterns of soil enzymes during water table restoration and also the triggers of these variations,soil samples(0-50 cm)were collected from a natural,a drained,and two rewetted areas of the Baijianghe peatland in June 2020.We measured soil physical and chemical properties and the activities of two oxidases(peroxidase and polyphenol oxidase)and three hydrolases(β-1,4-glucosidase,β-1,4-N-acetylglucosaminidase and acid phosphatase).The results showed that the activities of both peroxidase and polyphenol oxidase in 0-50 cm soils from the rewetted areas were significantly lower than those from the drained area.In terms of hydrolases,the activities of bothβ-1,4-glucosidase andβ-1,4-N-acetylglucosaminidase in 0-10 cm soils from the rewetted areas were significantly lower than those from the drained area.Soil enzyme activities in the natural area was mainly affected by soil water content,but mainly affected by soil pH and the contents of total nitrogen and phosphorus in the drained area.Both soil nutrients and water content affected soil enzymes in rewetted areas.Our results indicated that soil enzyme activities were controlled by different factors under different water tables and that the effect of water table on soil enzyme activities was largely dependent on soil depth.
作者
王钰婷
徐志伟
孙德敬
辛沐蓉
高畅
王艺晓
董彦民
王升忠
WANG Yu-ting;XU Zhi-wei;SUN De-jing;XIN Mu-rong;GAO Chang;WANG Yi-xiao;DONG Yan-min;WANG Sheng-zhong(Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Sciences,Northeast Normal University,Changchun 130024,China;Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains,Changchun 130024,China;State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Changchun 130024,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2022年第10期1940-1947,共8页
Chinese Journal of Ecology
基金
国家自然科学基金项目(32071599)
中央高校基本科研业务费项目(2412019FZ001)
吉林省自然科学基金(学科布局项目,20210101397JC)资助。
关键词
泥炭沼泽
排水
水位恢复
水解酶
氧化酶
peatland
drainage
water table restoration
hydrolase
oxidase
