| 陈金霞,但建国.外源氮、磷添加对琼北荔枝园土壤CH4氧化能力的影响[J].农业环境科学学报,2019,38(3):714-720. |
| 外源氮、磷添加对琼北荔枝园土壤CH4氧化能力的影响 |
| Effects of exogenous nitrogen and phosphorus on methane oxidation in litchi orchard soils in northern Hainan Province, China |
| 投稿时间：2018-03-03 |
| DOI：10.11654/jaes.2018-0277 |
| 中文关键词: 甲烷氧化 氮 磷 荔枝园土壤 |
| 英文关键词: methane oxidation nitrogen phosphorus litchi orchard soil |
| 基金项目:国家自然科学基金项目（31260118） |
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| 中文摘要: |
| 为明确氮（N）和磷（P）的输入对土壤氧化吸收大气甲烷（CH4）的影响，通过室内培养实验，研究了外源N、P添加对琼北3种荔枝园土壤CH4氧化速率的短期影响。结果表明：不同浓度处理的外源N[（NH4）2SO4]添加对3种荔枝园土壤（暗红湿润铁铝土，用T2表示；简育湿润铁铝土，用T3表示；湿润玻璃火山灰土，用H3表示）CH4氧化速率均产生抑制作用（P<0.05），较对照组平均抑制率分别达到29.93%、36.28%和24.80%。不同浓度外源P（KH2PO4）添加对3种荔枝园土壤CH4氧化具有促进作用，其中对T2、T3土壤CH4氧化具有明显的促进作用，H3呈现先促进后抑制的变化趋势。外源N、P同时添加对3种土壤CH4氧化均起到了促进作用，与单独添加外源N相比，N、P同时添加缓解了外源N对3种荔枝园土壤CH4氧化能力的抑制作用，其中T2土壤的缓解作用最高，这可能与其土壤的速效磷背景值较低有关。因此，在荔枝园土壤的施肥管理中应根据土壤类型合理增施N、P肥，以促使土壤对大气CH4的氧化能力维持在较高水平上。 |
| 英文摘要: |
| 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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