| 朱金龙,雒涌婷,高泽雨,石宇晴,朱琪淳,娄运生.不同颜色遮阳网模拟弱光对稻田CH4和N2O排放强度影响[J].农业环境科学学报,2025,44(9):2429-2440. |
| 不同颜色遮阳网模拟弱光对稻田CH4和N2O排放强度影响 |
| Emission intensity of CH4 and N2O under simulated low light with different colour shading net in paddy field |
| 投稿时间：2024-09-08 |
| DOI：10.11654/jaes.2024-0755 |
| 中文关键词: 弱光胁迫 水稻 甲烷 氧化亚氮 温室气体排放强度 |
| 英文关键词: low light stress rice methane nitrous oxide greenhouse gases emission intensity |
| 基金项目:国家自然科学基金项目（41875177） |
|
| 摘要点击次数: 831 |
| 全文下载次数: 696 |
| 中文摘要: |
| 为应对气候变化背景下阴雨寡照极端天气引起的弱光胁迫对区域水稻可持续生产的限制，本文研究了何种颜色遮阴网能较好模拟弱光环境及其对水稻产量、稻田CH4和N2O排放的影响。采用单因素完全随机田间试验设计，遮阴处理设置为：C0（对照，不遮阴）、C1（黑色遮阳网覆盖冠层）、C2（银灰色遮阳网覆盖冠层）和 C3（白色遮阳网覆盖冠层），平均遮阴率为 60%。结果表明：不同遮阴处理下水稻冠层光谱组成（光质）存在差异，即与C0相比，C1处理下红蓝光占比变化较小，红光/远红光比（R/FR）降低1.81%；C2处理下红光占比降低1.39%，蓝光占比增高1.09%，R/FR比降低1.96%；C3处理下红光占比增高5.54%，蓝光占比降低5.92%，R/FR比降低7.2%；C2处理下冠层红绿蓝光占比、光合有效辐射（PAR）变化值与阴雨天变化值均呈正相关。与C0相比，遮阴处理（C1、C2和C3）显著降低拔节-开花期地上部生物量，C1、C2处理显著降低干物质转运量及转运率；C1、C2和C3显著降低水稻产量，降幅分别为 65.7%、25.7% 和 33.3%。与 C0 相比，遮阴（C1、C2 和 C3）明显降低稻田 CH4排放通量，但增加 N2O 排放通量；C1、C2 和 C3 显著降低稻田 CH4累积排放量，降幅分别为 76.2%、85.2% 和 76.0%；明显增加 N2O 累积排放量，增幅分别为 19.1%、106.4%和295.0%。与C0相比，遮阴均显著降低稻田CH4和N2O对增温潜势的贡献和碳排放强度，C1、C2和C3处理下增温潜势降幅分别为75.6%、87.8%和74.2%，排放强度降幅分别为7.3%、83.4%和56.4%。产量与PAR显著相关，CH4排放对增温潜势的贡献与绿光占比显著相关，N2O排放对增温潜势的贡献与红蓝绿光占比及R/FR比均显著相关。研究表明，不同颜色遮阳网模拟弱光显著降低水稻产量和稻田碳排放强度，其中采用银灰色遮阳网模拟阴雨天弱光环境效果较好。 |
| 英文摘要: |
| In order to cope with the global climate change, the low light stress caused by extreme cloudy and rainy weather during the rice growing period has limited the sustainable production of rice in the middle and lower reaches of the Yangtze River of China. This study explores which color shading net can better simulate the low light environment, and what impact on rice production, CH4 and N2O emissions from rice field. The single factor randomized experimental design was adopted in this study. The shading treatment was set as follows：C0 （control, no shading）, C1（canopy covered with black shading net）, C2（canopy covered with silver grey shading net）, and C3（canopy covered with white shading net）, with the average shading rate being 60%. The results showed that, the differences existed in the spectral composition（light quality）on rice canopy under different shading treatments, i. e., in C1 treatment, the ratio of red and blue light to photosynthetic active radiation（PAR）changes slightly, and the ratio of red light to infrared（R/FR）decreased 1.81%; in C2 treatment, the ratio of red light to PAR decreased 1.39%, the ratio of blue light to PAR increased 1.09%, and the R/FR ratio decreased 1.96%, with similar properties to that under rainy weather; in C3 treatment, the ratio of red light to PAR increased 5.54%, the ratio of blue light to PAR decreased 5.92%, and the R/FR ratio decreased 7.2%. The changes in PAR, the ratio of red, blue and green light to PAR in C2 treatment were positively correlated with that under cloudy and rainy weather. Compared with C0 treatment, three shading treatments significantly reduced the shoot biomass during the jointing-flowering period, C1 and C2 treatments significantly reduced the dry matter translocation and translocation rate by 77%, 66.4%, and 70.8%, 58.1%, respectively; C1, C2 and C3 significantly decreased rice yield by 65.7%, 25.7% and 33.3%, respectively. In comparison with C0, shading（C1, C2 and C3）significantly decreased CH4 emission flux, but increased N2O emission flux. Compared to C0, C1, C2 and C3 significantly reduced the cumulative CH4 emission in the field by 76.2%, 85.2%, and 76.0%, respectively; while obviously increased the cumulative N2O emission by 19.1%, 106.4% and 295.0%, respectively. C1, C2 and C3 significantly reduced the global warming potential（GWP）and the emission intensity of CH4 and N2O（GHGI）in the field, with GWP decreasing by 75.6%, 87.8%, and 74.2%, and GHGI reducing by 7.3%, 83.4%, and 56.4%, respectively. The yield was significantly correlated with PAR. The contribution of CH4 emission to the GWP was significantly correlated with the ratio of green light to PAR, and the contribution of N2O emission to the GWP was significantly correlated with the ratio of red, blue, green light to PAR, and R/FR ratio. This study suggests that the simulated low light with different color shading nets significantly reduced the yield, and the GHGI in the paddy field. Silver gray shading net was the better choice for simulating low light environments induced by cloudy and rainy weather, and for accurately evaluating the GHGI in rice fields under low light conditions. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
