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首页> 外文期刊>Archives of Agronomy and Soil Science >Effects of water content and N addition on potential greenhouse gas production from two differently textured soils under laboratory conditions
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Effects of water content and N addition on potential greenhouse gas production from two differently textured soils under laboratory conditions

机译:在实验室条件下两种不同纹理土壤潜在温室气体产量的含水量和氮的影响

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摘要

GHGs production and emission may vary depending on soil physical properties, water management and fertilization. Two paddy soils characterized by different texture were incubated to evaluate the impact of flooding (permanent or intermittent) and N addition on potential N2O, CH4 and CO2 production and release into atmosphere and soil solution. Relationships with volumetric water content (VWC) and water filled pore space (WFPS) were evaluated. Overall, the finer clayey soil (CL) produced 58% more CH4 than the coarser sandy soil (SA) and showed an earlier sink to source transition; the difference was lower with N addition. Permanent flooding favoured the amount of dissolved CH4. SA produced more N2O emissions than CL under permanent flooding (31.0 vs. 3.7%); an opposite pattern was observed for dissolved N2O (16.4 vs. 52.7%). Fertilization increased N2O emissions under dry conditions in CL and under flooding in SA.Our findings showed that i) VWC had a larger influence on N2O and CH4 emissions than WFPS, ii) soil type influenced the gas release into atmosphere or soil solution and the timing of sink to source transition in CH4 emissions. Further investigation on timing of fertilization and drainage are needed to improve climate change mitigation strategies.
机译:温室气体的生产和排放可能因土壤物理性质,水管理和施肥而异。孵育了两种具有不同质地的水稻土,以评估洪水(永久性或间歇性)和N添加潜在的N2O,CH4和CO2的影响,并释放到大气和土壤溶液中。评价与体积含水量(VWC)和水填充孔隙空间(WFP)的关系。总的来说,较好的CLAYEY土壤(CL)比较粗糙的砂土(SA)更多的CH4产生了58%,并显示了早期的水槽来源过渡;添加差异较低。永久性洪水赞成溶解的CH4的量。 SA在永久性洪水下生产的更多N2O排放量(31.0与3.7%);溶解的N 2 O(16.4 vs.52.7%)观察到相反的图案。施肥增加了Cl的干燥条件下的N2O排放,在SA的洪水下。试验表明,I)VWC对N2O和CH4排放的影响大于WFP,II)土壤类型影响了气体释放到大气或土壤溶液中的气体释放和定时沉没在CH4排放中的源过渡。需要进一步调查施肥和排水的时间,以改善气候变化缓解策略。

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