文献类型：期刊文献

英文题名：Spartina alterniflora Invasion Enhances Dissimilatory Nitrate Reduction to Ammonium (DNRA) Rates in the Yangtze River Estuary, China

作者：Li, Niu[1,2,3] Nie, Ming[2,3] Wu, Ming[1] Wu, Jihua[2,3]

第一作者：李妞;Li, Niu

通信作者：Wu, JH[1];Wu, JH[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Wetland Ecosyst Res Stn Hangzhou Bay, Hangzhou 311400, Peoples R China;[2]Fudan Univ, Sch Life Sci, Inst Biodivers Sci, Minist Educ,Key Lab Biodivers Sci & Ecol Engn,Coa, Songhu Rd 2005, Shanghai 200433, Peoples R China;[3]Fudan Univ, Sch Life Sci, Inst Ecochongming, Songhu Rd 2005, Shanghai 200433, Peoples R China

年份：2022

卷号：10

期号：5

外文期刊名：JOURNAL OF MARINE SCIENCE AND ENGINEERING

收录：;Scopus(收录号：2-s2.0-85130384634);WOS:【SCI-EXPANDED(收录号:WOS:000801593700001)】；

基金：This research was supported by the NSFC funding (32030067) and the Shanghai Science and Technology Committee (20DZ1204702).

语种：英文

外文关键词：dissimilatory nitrate reduction to ammonium (DNRA); Spartina alterniflora; deep soil; salt marshes

摘要：Dissimilatory nitrate reduction to ammonium (DNRA) can save N by converting nitrate into ammonium and avoiding nitrate leaching and runoff in saltmarshes. However, little is known about the effects of invasive plants on DNRA in the upper and deeper soil layers in salt marshes. Here, we investigated DNRA rates in the soils of six different depth layers (0-5, 5-10, 10-20, 20-30, 30-50, and 50-100 cm) from the invasive Spartina alterniflora marshland, two native plants Scirpus mariqueter and Phragmites australis marshlands, and bare mudflat on Chongming Island, located in the Yangtze River Estuary, China. Our results show that S. alterniflora significantly increased DNRA rates in both the upper 50 cm soil and deeper 50-100 cm soil layers. With respect to the entire soil profile, the NO3- reduction content calculated from DNRA in S. alterniflora marshland was 502.84 g N m(-2) yr(-1), increased by 47.10%, 49.42%, and 38.57% compared to bare mudflat, S. mariquete, and P. australis, respectively. Moreover, NO3- reduction content from the 50-100 cm soil layers was almost identical to that in the upper 50 cm of the soil. In the month of May, DNRA is primarily regulated by SO42- and pH in the upper and deeper soil layers, respectively, whereas, in the month of October, soil pH accounted for the most variables of DNRA in both the upper and deeper soil layers. Altogether, these results from a new perspective confirm that S. alterniflora invasion increases soil N pool and may further push its invasion in salt marshes, and the importance of deeper soil in nitrogen cycling cannot be ignored.