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JCP最新文章 | 亚热带丘陵流域农业水塘温室气体排放长期变化特征及驱动因素

  • 2026-08-11 09:35:47
JCP最新文章 | 亚热带丘陵流域农业水塘温室气体排放长期变化特征及驱动因素

文献信息:

https://doi.org/10.1016/j.jclepro.2026.149076

Zhu, T., Zhang, W.*, Li, H., et al., 2026. Long-term greenhouse gas emissions from an agricultural pond in subtropical hilly catchment: Patterns and drivers. Journal of Cleaner Production 574: 149076

池塘作为水陆交互及物质与能量交换的重要地理单元,不仅在污染物截留中发挥关键作用,也是二氧化碳(CO2)、甲烷(CH4)和氧化亚氮(N2O)等温室气体产生、转化与排放的关键场所。在农业活动频繁与气候变化加剧的背景下,池塘内环境因子(如营养盐、溶解氧等)和远端水文地理条件(气温、降水等)如何共同影响池塘水体温室气体排放过程,是当前水生态学和全球变化领域关注的重要科学问题。

针对该问题,研究选取丘陵区典型农业池塘,开展了为期6年的逐月巡测(2019–2024),对比池塘不同季节、不同年份水体温室气体(CO2、CH4和N2O)排放变化规律,解析了近端和远端环境因子调控水体温室气体排放格局的内在机制。研究结果显示,CO2、CH4和N2O的平均通量分别为26.51±10.43、0.42±0.37和0.04±0.04 mmol m-2 d-1,各温室气体呈现出不同的时间变化规律:N2O在夏季有明显的排放脉冲,CH4则反常地在冬季达到峰值,而CO2则跟随温度变化呈现季节性节律特点(图2);研究进一步解析了其驱动因素,研究发现N2O与硝态氮关系密切,CH4与铵态氮和有机底物有关,CO2则与溶解氧和藻类生物量相关 (图3)。研究同时指出,前期降雨和干旱起到了关键的远端调控作用,触发了N2O和CH4排放的偶发“热点时刻”,而对CO2通量对上述水文波动响应较弱(图4)。这表明温室气体排放不仅受池塘内部条件影响,还来自降水驱动的坡地-池塘相互作用。为更好地发挥农业池塘减污降碳综合效益,池塘管理应统筹水质净化与温室气体调控双重目标,协同优化池塘养分拦截、连通性与水位调控。

01

研究内容与方法

天目湖流域位于太湖流域上游丘陵区(图1)。该区域地形起伏大,叠加湿润区降雨气候,在沟谷区形成了面广量大的池塘。这些池塘与邻近的集水坡地的构成了坡地-池塘系统,拦蓄坡地径流与流失的营养物质,形成特有的“源-汇”景观与水肥高效利用模式,成为丘陵区水分与营养盐迁移转化的关键节点。基于此,本文依托天目湖流域生态观测研究站的监测网络,选择一个具有代表性的农业池塘为研究对象,该池塘的集水坡地以集约化经营的茶园为主。

图1. 天目湖流域地形地貌及池塘所处位置

Fig 1. Locations and topography of the sampling pond in the Tianmu Lake Basin

02

研究结果

图2. 温室气体扩散通量在月度(a~c)、季节性(d~f)和年际(g~i)尺度变化动态。

Figure 2. Dynamics of GHG fluxes across monthly (a~c), seasonal (d~f), and interannual (g~i) scales. The dashed lines, as shown in (a~c), depict overall mean fluxes, and the semi-transparent areas around the lines show the 95% confidence intervals. Letters in (d~f) indicate significant differences (p < 0.05).

图3. 环境变量与溶解温室气体浓度及扩散通量之间的关系。条形图表示主要环境变量解释的方差百分比,星号表示显著性(*p < 0.05,**p < 0.01)。

Figure 3. Redundancy analysis (RDA) showing the relationships between environmental variables and dissolved GHG concentration and diffusive fluxes. The bar charts indicate the percentages of variance explained by the main environmental variables, with asterisks denoting significance (*p < 0.05, **p < 0.01).

图4. 结构方程模型揭示了池塘中温室气体浓度、扩散通量与降水及环境指标等关系。PRE代表降水。绿色箭头表示正标准化路径系数,红色箭头表示负标准化路径系数。此处的R²值表示模型解释的温室气体浓度和通量的总方差。

Figure 4. Graphical representation of the structural equation model relating dissolved GHG concentration and flux to the precipitation and environmental indicators in the tea pond. PRE stands for precipitation. A green arrow indicates a positive standardized path coefficient, while a red arrow depicts a negative standardized path coefficient. Significance levels are indicated: * and ** denoting p < 0.05 and p < 0.01, respectively. The final model showed a satisfactory fit to our data, as observed from the fit parameters at the bottom. R2 value here represents the total variance of GHG concentrations and fluxes explained by the model.

03

研究结论

本研究通过6年的持续监测显示丘陵流域农业池塘中CO2呈现温度驱动的季节变异特征,N2O在夏季因集水坡地氮流失而出现排放脉冲,而CH4则在冬季出现反直觉的峰值。前期降雨/干旱条件会产生短期的温室气体排放脉冲,且周期性掩盖了N2O和CH4原有的季节变异模式(而CO2对此类水文波动不敏感)。本文也强调了准确评估池塘温室气体排放需要同时考虑池塘生物地球化学因子和受坡地产汇流过程影响的远端驱动因素。因此,未来的温室气体排放估算应考虑排放的高时间变异性以及坡地与池塘之间的动态相互作用,以实现更为稳健的估算。

供稿人及团队:朱腾龙,中国科学院南京地理与湖泊研究所李恒鹏研究员团队博士研究生,主要从事水体氮磷循环与温室气体排放、农业面源模拟与调控等相关研究工作。论文通讯作者为中国科学院南京地理与湖泊研究所张汪寿研究员。

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  1. CONNECT:[ UseTime:0.000772s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000892s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000644s ]
  6. SELECT * FROM `set` [ RunTime:0.000231s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000683s ]
  8. SELECT * FROM `article` WHERE `id` = 568325 LIMIT 1 [ RunTime:0.000478s ]
  9. UPDATE `article` SET `lasttime` = 1786420834 WHERE `id` = 568325 [ RunTime:0.011931s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 568325 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000608s ]
  12. SELECT * FROM `article` WHERE `id` > 568325 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002605s ]
  13. SELECT * FROM `article` WHERE `id` < 568325 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001586s ]
  14. SELECT * FROM `article` WHERE `id` < 568325 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005364s ]
  15. SELECT * FROM `article` WHERE `id` < 568325 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012741s ]
0.183899s