缅甸两种种植方式下农民施肥对低地水稻甲烷和一氧化氮排放的影响

Q3 Environmental Science
Myo Thet Tin, A. Chidthaisong, N. Pumijumnong, Noppol Arunrat, M. Yuttitham
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引用次数: 0

摘要

确定最佳水稻种植方案并结合特定施肥,可以降低水稻生产的全球变暖潜值(GWP)和温室气体强度(GHGI)。本研究测定了不同施肥方式和移栽水稻(TPR)和湿床直播水稻(WDSR)两种不同种植方式下水稻甲烷(CH4)和一氧化氮(N2O)排放与产量的关系。采用分块设计和封闭室气相色谱法进行了气体通量测量的现场实验。CH4和N2O排放量分别为1.83 ~ 4.68 mg/m2/h和0.073 ~ 0.135 mg/m2/h。CH4和N2O的排放量在幼苗后48 ~ 69天(分蘖期)达到最小,而最大排放量一般在幼苗后90天或早期原始发育期(EPI)达到最大。结果表明,在整个生育期,TPR几乎在每个生育期都比WDSR产生更多的CH4和N2O。在温室气体排放因子方面,CH4排放量与土壤pH呈负相关(-0.35*,N=18)。土壤pH值越高,生长初期CH4排放量越低。N2O排放量与土壤pH值无相关性(-0.04 ns, N=18)。苗期和EPI后90 d平均CH4排放量最高,土壤温度最高,为34.8℃。CH4排放量与土壤温度的相关系数(r)为0.48*,N=18,呈正相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methane and Nitrous Oxide Emissions from Lowland Rice as Affected by Farmers’ Adopted Fertilizer Applications under Two Crop Establishment Methods in Myanmar
Identifying the optimal rice establishment option combined with specific fertilizer application can lower the global warming potential (GWP) and greenhouse gases intensity (GHGI) of rice production. In this study, methane (CH4) and nitric oxide (N2O) emissions and rice yields under different fertilizer application methods and two different planting methods, transplanted rice (TPR) and wet bed direct seeded rice (WDSR), was measured. Field experiments using a split plot design and closed chamber-GC method for gas flux measurements were conducted. CH4 and N2O emissions ranged from 1.83-4.68 mg/m2/h and 0.073-0.135 mg/m2/h, respectively. Minimum CH4 and N2O emissions were observed at 48-69 days after seedling (DAS) (tiller stage), while maximum emissions were generally found at 90 DAS or early primordial initiation (EPI) stage. It was found that TPR produced more CH4 and N2O than WDSR across fertilizers methods almost each growth stage throughout the growing period. Regarding GHGs emission factors, CH4 emissions were negatively correlated with soil pH (-0.35*, N=18). At higher soil pH, lower CH4 emissions were found in early growth stages. The N2O emissions did not correlate with soil pH (-0.04 ns, N=18). The highest average CH4 emission was reached in 90 days after seedling and EPI when the soil temperature was maximal at 34.8ºC. The correlation coefficient (r) between CH4 emission and soil temperature was 0.48*, N=18, indicating a positive correlation.
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来源期刊
Environment and Natural Resources Journal
Environment and Natural Resources Journal Environmental Science-Environmental Science (all)
CiteScore
1.90
自引率
0.00%
发文量
49
审稿时长
8 weeks
期刊介绍: The Environment and Natural Resources Journal is a peer-reviewed journal, which provides insight scientific knowledge into the diverse dimensions of integrated environmental and natural resource management. The journal aims to provide a platform for exchange and distribution of the knowledge and cutting-edge research in the fields of environmental science and natural resource management to academicians, scientists and researchers. The journal accepts a varied array of manuscripts on all aspects of environmental science and natural resource management. The journal scope covers the integration of multidisciplinary sciences for prevention, control, treatment, environmental clean-up and restoration. The study of the existing or emerging problems of environment and natural resources in the region of Southeast Asia and the creation of novel knowledge and/or recommendations of mitigation measures for sustainable development policies are emphasized. The subject areas are diverse, but specific topics of interest include: -Biodiversity -Climate change -Detection and monitoring of polluted sources e.g., industry, mining -Disaster e.g., forest fire, flooding, earthquake, tsunami, or tidal wave -Ecological/Environmental modelling -Emerging contaminants/hazardous wastes investigation and remediation -Environmental dynamics e.g., coastal erosion, sea level rise -Environmental assessment tools, policy and management e.g., GIS, remote sensing, Environmental -Management System (EMS) -Environmental pollution and other novel solutions to pollution -Remediation technology of contaminated environments -Transboundary pollution -Waste and wastewater treatments and disposal technology
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