Effects of emerged plant on soil methane emission and nitrogen content in constructed wetland. (January 2019) - Sun, Hongying
Abstract: To find the effects of emerged plant on soil methane (CH4) emission and nitrogen content in constructed wetland, we constructed the constructed wetland microcosms with 3 treatments through 2 emerged plants ( Typha orientalis and Phragmites australis ). Results showed that soil CH4 flux have no different (2.0, 2.4, 2.5 mg m −2 d −1, P > 0.05 ), but soil nitrogen contents and microbial biomass nitrogen were significantly different ( P < 0. 01 ) among the 3 treatments. The soil ammonium nitrogen ( P < 0.001 ) and nitrate nitrogen ( P < 0.01 ) contents in the planted constructed wetland were lower than in those unplanted constructed wetland, but microbial biomass nitrogen (MBN) were higher ( P < 0.01 ). The soil CH4 flux, microbial biomass, organic matter and nitrogen content had no different between those constructed wetlands planted with Typha orientalis and Phragmites australis ( P > 0.05 ). As total plant biomass in the constructed wetlands planted with Typha orientalis ( P < 0.001 ) were higher than that in the constructed wetlands planted with Phragmites australis ( P < 0.05 ). Hence, emerged plant regulate soil nitrogen removal but not affect soil CH4 emission in these systems.