| 重庆化肥投入驱动因素、减量潜力及环境效应分析 |
| 摘要点击 582 全文点击 158 投稿时间：2022-11-26 修订日期：2023-04-11 |
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| 中文关键词 种植业结构 化肥减量潜力 活性氮损失 温室气体（GHG）排放 水体富营养化潜值 |
| 英文关键词 cropping structure fertilizer reduction potential reactive N loss greenhouse gas （GHG） emission eutrophication potential |
| 作者 | 单位 | E-mail | | 梁涛 | 重庆市农业科学院, 重庆 401329 | swuliangtao@163.com | | 赵敬坤 | 重庆市农业技术推广总站, 重庆 401120 | | | 李红梅 | 重庆市农业技术推广总站, 重庆 401120 | | | 王妍 | 重庆市农业科学院, 重庆 401329 | | | 曹中华 | 重庆市农业科学院, 重庆 401329 | | | 张务帅 | 重庆市农业技术推广总站, 重庆 401120 | | | 王孝忠 | 重庆市农业技术推广总站, 重庆 401120 | | | 郭超仪 | 重庆市农业技术推广总站, 重庆 401120 | | | 石孝均 | 西南大学资源环境学院, 重庆 400715 | | | 陈新平 | 西南大学资源环境学院, 重庆 400715 | chenxp2017@swu.edu.cn |
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| 中文摘要 |
| 为定量化揭示重庆市种植业结构变化对化肥投入和环境代价的影响,制定科学合理减肥策略,基于重庆中等生产力水平下农作物化肥定额标准和大样本农户调查数据,采用差值法和生命周期法,评价分析重庆种植业化肥的减施潜力及其环境效益.结果表明：①自重庆直辖（1997年）以来,粮食作物（水稻、玉米、小麦、豆类和薯类）播种面积占比下降21%,而水果和蔬菜播种面积占比增加20%.②蔬菜（37%）和柑橘（17%）生产系统消耗了近55%的化肥总量,而水稻、玉米和薯类则分别消耗了11%、12%和12%.③依2000~2019年化肥总消费量的变化趋势分析,“十四五”期间重庆化肥消费量预计将降至8.6 × 105 t.定额标准全部实现后,总减肥量可达1.69 × 105 t,减肥潜力为18.6%,其中,水稻、玉米、柑橘和蔬菜的减肥潜力（减肥量）分别为0.3%（2.9 × 102 t）、12%（1.45 × 104 t）、21%（3.65 × 104 t）和30%（1.18 × 105 t）.另一方面,油菜系统表现出磷钾肥不足,玉米表现出钾肥不足态势.④当前生产水平下,重庆种植业的氮素损失、温室气体排放量和水体富营养化潜值分别高达1.81 × 105 t（以N计）、1.43 × 107 t（以CO2-eq计）和1.74 × 105 t（以PO4-eq计）.随作物定额标准实现程度的增加（60%~100%）,活性氮损失、温室气体排放和水体富营养化潜值将分别降低14.9%~24.9%、10.1%~16.7%和13.8%~23%.重庆种植业结构发生了重大变化,化肥消费总量呈缓慢下降趋势,经济作物的施肥强度居高不下.农业化肥减施潜力较大,尤其是柑橘和蔬菜生产系统,但也应注意玉米钾肥和油菜磷钾肥投入不足的问题. |
| 英文摘要 |
| In this study, we sought to quantify the effect of planting structure change on fertilizer input and environmental cost in Chongqing and develop scientific and rational strategies for chemical fertilizer reduction. Based on the crop fertilizer quota standard and large sample farmer survey data under the medium productivity level in Chongqing, we evaluated and analyzed the application reduction potential and environmental benefits of fertilizer with the difference method and life cycle assessment. The results showed that:① since Chongqing became a municipality directly under the central government (1997), Chongqing crop planting structure had greatly changed, and the proportion of food crop (rice, corn, wheat, bean, and potato) decreased by 21%. The area of fruits and vegetables increased from 3.36×105 hm2 to 1.05×106 hm2, and their proportion increased by 20%. ② Nearly 55% of fertilizers had been consumed by vegetable (37%) and citrus production systems, and 11%, 12%, and 12% of fertilizers were consumed by rice, corn, and potato, respectively. ③ The total fertilizer reduction of the Chongqing planting industry could reach up to 1.69×105 tons during the period of "the 14th Five-Year Plan," with a fertilizer reduction potential of 18.6%. The fertilizer reduction potential (reduction amount) of rice, corn, citrus, and vegetables would reach 0.3% (2.9×102 tons), 12% (1.45×104 tons), 21% (3.65×104 tons), and 30% (1.18×105 tons), respectively. On the other hand, the rape system was insufficient in phosphorus potassium fertilizers, and the corn tended to be insufficient in potash fertilizer. ④ The current production level was low, and the nitrogen loss, greenhouse gas emissions, and eutrophication potential in the planting industry of Chongqing reached 1.81×105 tons (N), 1.43×107 tons (CO2-eq), and 1.74×105 tons (PO4-eq). With the increase in the realization degree of the crop quota standard (60%-100%), the reactive nitrogen loss, greenhouse gas emissions, and eutrophication potential decreased by 14.9%-24.9%, 10.1%-16.7%, and 13.8%-23%, respectively. The structure of the planting industry in Chongqing significantly changed, the total fertilizer consumption in Chongqing tended to decline gradually, and the fertilization intensity of commercial crops stayed at a high level. The agricultural fertilizer reduction potential and the reactive nitrogen and greenhouse gas emission reduction potential were large, especially for citrus and vegetable production systems. However, it is also necessary to pay attention to insufficient corn potash fertilizer and rape phosphorus potassium fertilizer investment and carry out collaborative promotion of fertilizer reduction. |
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