Impacts of Spartina alterniflora invasion on soil organic carbon and nitrogen pools sizes, stability, and turnover in a coastal salt marsh of eastern China

被引：89
作者：
Yang, Wen [1 ,2 ,3 ]
An, Shuqing [1 ,2 ,3 ]
Zhao, Hui [1 ,2 ,3 ]
Xu, Lingqian [1 ,2 ,3 ]
Qiao, Yajun [1 ,2 ,3 ]
Cheng, Xiaoli [4 ]
机构：
[1] Nanjing Univ, Sch Life Sci, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Inst Wetland Ecol, Nanjing 210093, Jiangsu, Peoples R China
[3] Jiangsu Engn Lab Wetland Restorat, Changshu 215500, Peoples R China
[4] Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Peoples R China
来源：
ECOLOGICAL ENGINEERING | 2016年 / 86卷
关键词：
Coastal wetlands; Light fraction; Mineral associated organic matter; Soil organic C and N; Particulate organic matter; Soil density and size fractionation; WOODY PLANT ENCROACHMENT; MATTER DYNAMICS; TROPICAL PASTURES; DENSITY FRACTIONS; ECOSYSTEM CARBON; JIANGSU PROVINCE; NATURAL C-13; LAND-USE; GRASSLAND; STORAGE;
D O I：
10.1016/j.ecoleng.2015.11.010
中图分类号：
Q14 [生态学（生物生态学）];
学科分类号：
071012 ; 0713 ;
摘要：
Plant invasion may impact ecosystem structure and function, and further affect soil organic matter (SOM) dynamics. However, the influence of plant invasion on soil organic carbon (C) and nitrogen (N) pools sizes, stability, and turnover in SOM of invaded ecosystems is not fully understood. In this study, soil C and N contents, and delta C-13 and delta N-15 values of free light fraction (LF), intra-aggregate particulate organic matter (iP0M) and mineral-associated organic matter (mSOM) were investigated in an invasive Spartina alterniflora community, adjacent bare flat and native Suaeda salsa and Phragmites australis communities. Short-term S. alterniflora invasion significantly enhanced organic C and N contents in SOM, free LF, iPOM, mSOM compared with bare flat and increased the proportion of allocated C in iPOM compared with S. salsa and P. australis soils (0-0.30m depth). The proportion of the S. alterniflora-derived C in free LF and iPOM were significantly higher than that in mSOM, and the highest S. alterniflora-derived C content was found in iPOM of S. alterniflora soil. The most enriched delta N-15 values were found in S. alterniflora soil. Increased 815N values and decreased C:N ratios from the free LF to iPOM to mSOM in S. alterniflora soil indicated a greater degree of decomposition. The results suggest that 10-year S. alterniflora invasion significantly alters soil organic C and N pools sizes and stability through changing plant residuals input, physical distribution of S. alterniflora-derived C and C turnover in SOM fractions. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：174 / 182
页数：9
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