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摘要:
Riparian buffers,located in the transition zone between terrestrial and aquatic ecosystems,are a hotspot for nitrogen (N) removal through denitrification.Earthworms are abundant in riparian buffers and may enhance denitrification.This study investigated earthworm demographics of three earthworm functional groups (anecic,epigeic,and endogeic) and denitrifier activity in temporarily flooded and non-flooded riparian soils from April to October 2012 in southern Quebec,Canada.Nine earthworm species,mostly endogeic,were found in the temporarily flooded soil,while only six earthworm species were found in the non-flooded soil.On average,there were 11.7 times more earthworms with 12.4 times greater biomass (P < 0.05) found in the temporarily flooded soil than in the non-flooded soil.The denitrification enzyme activity (DEA) was of similar magnitude in temporarily flooded and non-flooded soils,with temporal variation associated with rainfall patterns.Endogeic earthworm biomass was positively correlated (P < 0.05) with DEA,while epigeic earthworm biomass was positively correlated (P < 0.05) with 16S rRNA gene copies and nosZ gene copies from bacteria,indicating an association between earthworm functional groups and denitrifier activity in riparian soils.Stepwise multiple regressions showed that DEA in riparian soils could be predicted using soil moisture,inorganic N concentration,and earthworm functional groups,suggesting that endogeic and epigeic earthworms contributed to denitrifier activity in riparian soils.
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篇名 Earthworm functional groups are related to denitrifier activity in riparian soils
来源期刊 土壤圈(英文版) 学科
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年,卷(期) 2021,(3) 所属期刊栏目 Research Articles
研究方向 页码范围 413-422
页数 10页 分类号
字数 语种 英文
DOI 10.1016/S1002-0160(20)60084-4
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土壤圈(英文版)
双月刊
1002-0160
32-1315/P
16开
南京市北京东路71号中国科学院南京土壤研究所
2-576
1991
eng
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