Soil properties alter plant and microbial communities to modulate denitrification rates in subtropical riparian wetlands

Land Degradation and Development - Tập 31 Số 14 - Trang 1792-1802 - 2020
Lin Ma1,2, Ziqian Xiong3, Lunguang Yao4, Guihua Liu1,5,2, Quanfa Zhang1,5,2, Wenzhi Liu1,5,2
1CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, PR China
2Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, Wuhan Botanical Garden, Chinese Academy of Sciences Wuhan PR China
3Hubei International Scientific and Technological Cooperation Center of Ecological Conservation and Management in Three Gorges Area, China Three Gorges University Yichang PR China
4Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University Nanyang PR China
5Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan, PR China

Tóm tắt

AbstractThe capacity of riparian wetlands to remove nitrogen from upland runoff through the denitrification process is mainly controlled by soil properties and biological communities. However, the pathways or mechanisms by which soil properties and biological communities may regulate riparian denitrification rates are still largely unknown. Here, we measured the potential and unamended denitrification rates in sediments from riverine wetlands along a nitrogen‐rich river in subtropical China. We also investigated the plant richness, vegetation cover, and abundance of denitrifying microorganisms in wetland soils. The results show that both potential and unamended denitrification rates presented strong seasonality, and were found to be significantly associated with nitrogen concentration in soils, implying that denitrification process in riparian wetlands is probably nitrogen limited. Moreover, potential and unamended denitrification rates were positively related to denitrifier abundance, plant richness, and vegetation cover. Using structural equation modeling, we found that moisture and nitrogen concentration could influence denitrification rates directly; the indirect effects of these factors on denitrification rates mediated through modulating the structure of plant and microbial communities. These findings suggest that denitrification rates and nitrogen removal capacities in riparian wetlands are jointly modulated by soil properties and biological communities.

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Thông tin xuất bản

Land Degradation and Development

Tập 31 Số 14

1792-1802

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