| 虞晓兰,张方敏,方砚秋,卢燕宇,张凯迪,倪婷.淮河流域稻麦轮作系统CH4通量模拟及减排研究[J].农业环境科学学报,2023,42(10):2346-2357. |
| 淮河流域稻麦轮作系统CH4通量模拟及减排研究 |
| Simulation and reduction of CH4 flux emission in a rice-wheat rotation system in the Huai River Basin, China |
| 投稿时间：2023-07-05 |
| DOI：10.11654/jaes.2023-0536 |
| 中文关键词: 稻麦轮作农田 气候变化 CH4通量 DNDC模型 减排措施 秸秆还田 |
| 英文关键词: rice-wheat rotation farmland climate change CH4 flux DNDC model reduction measure straw returning |
| 基金项目:江苏省碳达峰碳中和科技创新专项资金（BK20220017）；中国气象局沈阳大气环境研究所联合开放基金（2021SYIAEKFMS37）；中国气象局气象能力提升联合研究专项（22NLTSQ011） |
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| 中文摘要: |
| 为研究气候变化下不同管理措施对淮河流域稻麦轮作农田生态系统CH4通量的影响，通过参数率定后的DNDC（DeNitrification-DeComposition）模型，估算了淮河流域历史时期（2000—2020年）及未来（2021—2049年） RCP4.5 （中等排放强度情景）和RCP8.5（高排放强度情景）两种情景下稻麦轮作农田CH4通量时空分布特征，评估了未来气候变化下多种田间管理措施对流域CH4的减排能力。结果表明：淮河流域历史时期区域CH4通量平均排放强度为125.3 kg·hm-2，未来两种情景（RCP4.5和RCP8.5）下区域CH4通量平均排放强度分别为140.5 kg·hm-2和150.5 kg·hm-2，总体均呈显著上升趋势（P<0.01）。空间上，未来两种情景下CH4通量空间分布特征相似，均呈现南部和西北部地区CH4通量高，东北部和中西部地区CH4通量低的特征。与基础措施相比，不同施肥量措施均减少了CH4排放，但不同秸秆还田措施提高了CH4排放水平。研究表明，在仅考虑控制淮河流域CH4通量的情况下，秸秆不还田+减量施肥20%是未来气候变化情景下最佳田间管理措施。 |
| 英文摘要: |
| To study the impact of different management measures on CH4 fluxes in rice-wheat rotation cropland ecosystems in the Huai River Basin under future climate change scenarios, the CH4 fluxes and their spatiotemporal characteristics during the historical period (2000-2020)and the future(2021-2049)under RCP4.5(medium emission intensity)and RCP8.5(high emission intensity)scenarios were estimated using the DeNitrification-DeComposition(DNDC)model following parameter calibration. Compared with the basic measure during the historical period, the CH4 reduction capacities of different field management measures were evaluated under different future climate change scenarios. The following results were obtained. The average emission intensity of regional CH 4 flux in the basin during the historical period was 125.3 kg · hm-2, whereas those in the future were 140.5 kg · hm-2 and 150.5 kg · hm-2 under RCP4.5 and RCP8.5 scenarios, respectively. Furthermore, they all exhibited significant upward trends(P<0.01). The spatial distribution characteristics of CH4 flux were similar under the two future scenarios, with high and low CH4 fluxes in the southern and northwestern and northeastern and central western regions, respectively. Compared with the basic measure, different fertilizer application measures reduced CH 4 emissions, whereas straw returning measures increased them. Hence, when only CH4 flux in the Huai River Basin was regulated, the optimal field management measure under the two future climate change scenarios was no return straw to the field with a 20% reduction in fertilizer application. |
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