Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Qian-Wei Li, Xiao-Ya Zhang, Jun-Qin Gao, Ming-Hua Song, Jin-Feng Liang and Yi Yue
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Qian-Wei Li: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
Xiao-Ya Zhang: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
Jun-Qin Gao: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
Ming-Hua Song: Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, A11, Datun Road, Chaoyang District, Beijing 100101, China
Jin-Feng Liang: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
Yi Yue: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China

Sustainability, 2019, vol. 11, issue 6, 1-12

Abstract: (1) Background: Increased attention has been paid to atmospheric nitrogen (N) deposition caused by human activities. N deposition quantity has seriously affected plant productivity and greenhouse gas emissions in wetlands, but the effects of N deposition frequency remain unclear. (2) Methods: We assembled microcosms, which contained vegetative individuals (ramets) of Hydrocotyle vulgaris and soil and subjected them to three frequencies (N addition 1, 2, and 14 times during the experimental period) crossed with three quantities (5, 15, and 30 g N m −2 yr −1 ) for 90 days. (3) Results: The quantity of N addition significantly increased the root, stem biomass, and ramets number of H. vulgaris , but decreased the spike biomass. N addition quantity significantly promoted N 2 O emission and inhibited CH 4 emission but had no significant effect on CO 2 emission. The increasing frequency of N addition significantly promoted the root-to-shoot ratio and decreased N 2 O emission under high N addition quantity. (4) Conclusions: In conclusion, N addition alters the reproductive strategy of H. vulgaris and enhances its invasiveness, promoting N 2 O emission but not the CO 2 equivalent of the H. vulgaris -soil system.

Keywords: greenhouse gas; growth; Hydrocotyle vulgaris; N addition frequency (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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