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| Effects of exogenous nitrogen and phosphorus on methane oxidation in litchi orchard soils in northern Hainan Province, China |
| Received:March 03, 2018 |
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| KeyWord:methane oxidation;nitrogen;phosphorus;litchi orchard soil |
| Author Name | Affiliation | E-mail | | CHEN Jin-xia | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | DAN Jian-guo | Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | danwolke@foxmail.com |
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| Abstract: |
| Nitrogen (N) and phosphorus (P) inputs are important factors affecting atmospheric methane (CH4) consumption by soils. Using laboratory incubation techniques, the short-term effects of N and P addition on soil CH4 oxidation in different types of litchi orchard soils in northern Hainan Island were determined in July 2016. Further, the soil samples collected from three litchi orchards in northern Hainan island were incubated at 26℃ with gravimetric water content of 15% and an initial CH4 concentration of approximately 15 μL·L-1 to determine the effects of exogenous N and P on methane oxidation in different types of soils. The results showed that CH4 oxidation in all litchi orchard soils[Rhodi-Udic Ferralosols (T2), Hapli-Udic Ferralosols (T3), and Udi-Vitric Andosols (H3)] decreased significantly after the exogenous addition of N[(NH4)2SO4]. Compared with that of the control treatment, CH4 oxidation rate in different types of soils decreased by 29.93%, 36.28%, and 24.80%, respectively. Methane oxidation in litchi garden soils (T2 and T3) significantly increased after the addition of exogenous P (KH2PO4); CH4 oxidation rates initially increased with incubation time but then decreased in H3 soils. The addition of N and P can stimulate CH4 oxidation in three litchi soils. N and P were added to mitigate the inhibitory effect of exogenous N on the CH4 oxidation capacity of three litchi orchard soils, and the relieving effect in T2 soil was higher, which might be attributed to the background value of available P in soil. Therefore, the selection of appropriate N and P fertilizers and the improvement of organic matter status of soils are recommended to maintain high CH4 oxidation rates in upland soils. |
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