Macropore structure and water management affect greenhouse gas emissions in agricultural fields
Macropore structure and water management affect greenhouse gas emissions in agricultural fields
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DOI：
10.1007/s10333-021-00865-4
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发表时间：
2021-07
影响因子：
2.2
通讯作者：
Thanh Long Bui;Y. Mori;Yutaro Yamamoto;M. Maeda
中科院分区：
文献类型：
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作者：
Thanh Long Bui;Y. Mori;Yutaro Yamamoto;M. Maeda
温室气体（GHG）排放过程受土壤因素的影响很大。在这里，进行了深入的实验，以观察孔隙结构和水分管理对农业土壤温室气体排放，土壤总碳，氮的影响。Masa和水稻土制备有/没有大孔和有/没有堆肥应用。Masa土壤暴露于不饱和/饱和条件下，而水稻土暴露于有/无排水条件下。CO2排放量从Masa土壤与大孔隙高于Masa土壤没有大孔隙，由于增强气体排放途径。在非淹水条件下，表层土壤总碳（TC）相对低于底层土壤，表明CO2排放来自表层土壤。在淹水条件下，底层土壤TC相对低于表层土壤，表明CO2和CH 4主要由底层土壤排放。大孔隙水稻土的CO2排放量高于无大孔隙水稻土。然而，CO2和CH 4排放量低于排水应用比不排水时，大孔和堆肥的应用。CH 4浓度与入渗速率呈负相关，说明在大孔隙和排水性土壤中有淡水或氧气存在。TC和TN浓度在底层土壤中低于在表层土壤中，这表明在没有排水的土壤中还原条件的发展。研究结果表明，大孔减少还原条件，从而降低CH 4排放。
The process of greenhouse gas (GHG) emission processes is substantially affected by soil factors. Here, an intensive experiment was conducted to observe the effects of pore structure and water management on agricultural soil GHG emissions, total soil carbon, and nitrogen. Masa and paddy soils were prepared with/without macropores and with/without compost application. The Masa soil was exposed to unsaturated/saturated conditions, whereas the paddy soil was exposed to flooded conditions with/without drainage. CO2emission from the Masa soil with macropores was higher than that from the Masa soil without macropores due to enhanced gas emission pathway. Total carbon (TC) was relatively lower in the top soil than in the bottom soil under non-flooded conditions, indicating CO2emission from the top soil. Contrarily, TC was relatively lower in the bottom soil than in the top soil under flooded conditions, showing CO2and CH4emission from the bottom soil. Furthermore, the paddy soil with macropores showed higher CO2emission than the soil without macropores. However, CO2and CH4emissions were lower with drainage application than without drainage in soils when macropores and compost were applied. The CH4concentration negatively correlated with the infiltration rate, indicating that fresh water or oxygen was available in the soils with macropores and drainage. The TC and TN concentrations were lower in the bottom soil than in the top soil, suggesting the development of reductive conditions in soils without drainage. The findings showed that macropores reduced reductive conditions, thereby lowering CH4emission.