文献类型：期刊文献

英文题名：Specific root length regulated the rhizosphere effect on denitrification across distinct macrophytes

作者：Wang, Shaokun[1,2,3] Li, Jing[1,2,3] Wang, Rumiao[1,2,3] Hu, Yukun[4] Li, Wei[1,2,3] Cui, Lijuan[1,2,3]

第一作者：Wang, Shaokun

通信作者：Cui, LJ[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Ecol Funct & Restorat, Beijing 100091, Peoples R China;[2]Beijing Hanshiqiao Natl Wetland Ecosyst Res Stn, Beijing 101399, Peoples R China;[3]Chinese Acad Forestry, Inst Ecol Conservat & Restorat, Beijing 100091, Peoples R China;[4]Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730000, Peoples R China

年份：2024

卷号：449

外文期刊名：GEODERMA

收录：;EI(收录号：20243316874971);Scopus(收录号：2-s2.0-85200958180);WOS:【SCI-EXPANDED(收录号:WOS:001296293400001)】；

基金：This work was supported by the National Key R & D Program of China (2022YFF1301000) , Fundamental Research Funds of CAF (CAFYBB2020QB008) , and the National Natural Science Foundation of China (31901149) .

语种：英文

外文关键词：Nitrogen removal; Macrophyte; Root traits; Rhizosphere effect; Denitrifiers; Plant-soil interaction

摘要：Macrophytes influence nitrogen (N) removal from wetlands. However, the specific plant traits responsible for this effect and the related microbial mechanisms remain largely unknown, especially root traits. In a mesocosm experiment, we determined the rhizosphere effect (RE) on microbial N removal processes by incubating rhizosphere and bulk soils collected from 11 macrophyte species. In addition, we examined root traits (involved in chemistry and morphology), along with examining the diversity, compositions, and abundance of bacterial communities involved in denitrification (nirS and nirK) and anammox (hzsB). Across the 11 macrophyte species, the positive RE on denitrification ranged from 66% to 412%, with an average of 194.72%. RE on denitrification was significantly and positively correlated with the recruitment of nir-type denitrifiers in the rhizosphere. We found that higher specific root length (SRL) root promoted the stronger RE, by increasing the abundance of nirtype denitrifiers and further enhancing N removal. Net N removal from water in the wetlands increased with a higher positive RE on nir-type denitrifiers. In addition, SRL significantly influenced the compositions of denitrifiers in the rhizosphere soil. We further found that the enrichment of Azospira, Bradyrhizobium, Sinorhizobium, Rhodopseudomonas, Alcaligenaceae, Bradyrhizobiaceae, and Pleomorphomonas improved the denitrification rate. These findings highlight the potential of root morphology in regulating plant-microbe interactions, thereby improving water purification.