水土保持学报2025，Vol.39Issue(3)：278-287,302,11.DOI:10.13870/j.cnki.stbcxb.2025.03.036
闽江河口湿地不同生境土壤酶活性及其化学计量特征
Soil Enzyme Activities and Stoichiometric Characteristics in Different Habitats of the Minjiang Estuarine Wetland
摘要
Abstract
[Objective]This study aimed to better enhance our understanding of soil enzyme activity characteristics and microbial nutrient limitations within estuarine wetland ecosystems.[Methods]Four representative habitats in the Minjiang Estuarine Wetland,including salt marshes(Phragmites australis marsh,Cyperus malaccensis marsh),bare mudflats,mangrove wetlands,and restored ponds,were selected for investigation.Variations in soil extracellular enzyme activities and enzymatic stoichiometric characteristics across these habitats were explored.[Results]1)The activities of soil β-1,4-glucosidase(βG),cellobiohydrolase(CBH),and β-1,4-N-acetyl-glucosaminidase(NAG)were significantly higher in P.australis marshes,C.malaccensis marshes,and mangrove wetlands than in bare mudflats and restored ponds(p<0.05).Soil enzyme activities in all habitats decreased with increasing soil depth and stabilized below 50 cm.2)The vector angle(VA)of soil enzymes across different habitats remained consistently<45°,suggesting that soil microbes in this area might be primarily nitrogen(N)-limited.Compared to the unvegetated bare mudflats and restored ponds,enzyme vector lengths(VL)were longer in P.australis and C.malaccensis marshes as well as mangrove wetlands,indicating stronger carbon(C)limitations in these habitats.3)Redundancy analysis revealed that the activities of surface(0-40 cm)soil enzymes were mainly regulated by soil organic matter content,temperature,electrical conductivity,and pH,while the enzyme activities at deeper soil layers(40-100 cm)were more influenced by soil bulk density and ammonium-nitrogen content.[Conclusion]Soil enzyme activities in the Minjiang Estuarine Wetland differ significantly across habitats and soil depths,with distinct regulatory factors influencing surface and subsurface enzyme activities.Overall,soil microbes in the region are subject to dual limitations of N and C.These findings contribute to a deeper understanding of the complex soil microenvironment in estuarine wetlands and provide valuable data for ecological protection and restoration of these areas.关键词
土壤酶活性/酶化学计量/生境差异/河口湿地Key words
soil enzyme activity/enzymatic stoichiometry/habitat differences/estuarine wetland分类
资源环境引用本文复制引用
王景涛,胡敏杰,廖浩宇,刘春雅,吴辉,倪冉旭..闽江河口湿地不同生境土壤酶活性及其化学计量特征[J].水土保持学报,2025,39(3):278-287,302,11.基金项目
福建省林业科技项目(2025FKJ16) （2025FKJ16）
中央财政林业科技推广示范项目(闽[2024]TG28号) （闽[2024]TG28号）
国家自然科学基金项目(42171102) （42171102）
