Title：
Response of the soil microbial community composition and biomass to a short-term Spartina alterniflora invasion in a coastal wetland of eastern China
Authors：
Corresponding
Author：
Wen Yang, Yaner Yan, Fan Jiang, Xin Leng*, Xiaoli Cheng*, Shuqing An
Pubyear：
2016
Title of
Journal：
Plant Soil
Paper
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Abstract：
Aims Plant invasion has been reported to alter ecosys- tem carbon (C) and nitrogen (N) cycling processes and pools. The mechanisms involved in how plant invasion affects the soil microbial community—the primary me- diator of soil C and N cycling—remain poorly under-stood. The objective of this study was therefore to evaluate the effect of plant invasion on the soilmicrobialcommunity in a coastal wetland of eastern China. Methods We investigated the impact of an exotic C4perennial grass, Spartina alterniflora, on the soil micro- bial community structure based on ospholipid fatty acids (PLFAs) analysis and chloroform fumigation- extraction by comparing it to that of bare flat and native C3 plants Suaeda salsa and Phragmites australis communities. Results Spartina alterniflora invasion significantly in- creased soil microbial biomass C and the total and various types of PLFAs compared with bare flat, Suaeda 33 salsa and P. australis communities. Increased concen- 34 trations of soil moisture, electrical conductivity, water- 35 soluble organic carbon (WSOC), and total, labile and 36 recalcitrant soil organic C and N, and decreased soil pH 37 in Spartina alterniflora community explained 65.9% of 38 the total variability in the PLFAs.WSOC and soil labile 39 organic N were strongly correlated with PLFAs, where- 40 as soil pH was negatively related to PLFAs. 41 Conclusions A 10-year Spartina alterniflora invasion 42 significantly altered soil microbial biomass and commu- 43nity structure by increasing available substrate. The 44 changes in soilmicrobial biomass and community struc- 45 ture may in turn enhance soil C and N sequestration in a 46 coastal wetland of eastern China.
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