| 郭树芳,许稳,翟丽梅,刘宏斌,雷宝坤.洱海流域不同农田生态系统的磷干湿沉降特征及影响因素[J].农业环境科学学报,2024,43(12):2901-2911. |
| 洱海流域不同农田生态系统的磷干湿沉降特征及影响因素 |
| Dry and wet phosphorus deposition characteristics and influencing factors in different farmland ecosystems in the Erhai Lake basin |
| 投稿时间：2024-05-13 |
| DOI：10.11654/jaes.2024-0407 |
| 中文关键词: 洱海流域 农田生态系统 磷沉降 干沉降 湿沉降 |
| 英文关键词: Erhai Lake basin farmland system phosphorus deposition dry deposition wet deposition |
| 基金项目:国家自然科学基金项目（42067047）；云南省农业联合专项（202301BD070001-019）；云南省兴滇英才支持计划项目；云南省嵩明农业环境与土壤野外科学观测研究站项目（202205AM340026） |
|
| 摘要点击次数: 532 |
| 全文下载次数: 426 |
| 中文摘要: |
| 为明确不同农田生态系统大气磷（P）干湿沉降特征及影响因素，本研究以洱海流域典型蔬菜和水旱轮作系统为研究对象，分析了两种典型农田生态系统大气磷干沉降和湿沉降的时间分布特征、差异及其影响因素。结果表明，蔬菜系统PM2.5浓度均值为41.6 μg·m-3，显著（P<0.05）高于水旱轮作系统（34.9 μg·m-3）。蔬菜和水旱轮作系统总磷（TP）干沉降量分别为0.233 kg·hm-2和0.084 kg·hm-2，可溶性总磷（DTP）占90%以上，主要分布在冬季和春季（1—4月），且蔬菜系统显著（P<0.01）高于水旱轮作系统。蔬菜和水旱轮作系统TP湿沉降量分别为0.72 kg·hm-2和0.91 kg·hm-2，以DTP沉降为主。蔬菜和水旱轮作两种农田生态系统的TP沉降均以湿沉降为主，分别占75.6%和91.6%，其中夏季和秋季（6—11月）沉降量分别占年沉降总量的70.7%和76.4%。风速、干沉降中磷浓度、大气湿度和降雨量是磷干沉降的关键影响因素，风速、大气温度、湿度和降雨量是磷湿沉降量的关键影响因素。可见，作物种植模式和气象因素等影响了PM2.5、降雨量和磷沉降速率等，进而改变了不同农田系统磷干沉降和湿沉降量。 |
| 英文摘要: |
| To clarify the characteristics and influencing factors of dry and wet phosphorus（P） deposition from different farmland ecosystems, the typical vegetable and rice-rotated systems in the Erhai Lake basin were taken as the research objects, and the temporal distribution characteristics of phosphorus deposition, differences, and their influencing factors in the two typical farmland ecosystems were analyzed. The results showed that the averaged PM2.5 concentration in the vegetable system was 41.6 μg·m-3, which was significantly higher than that in the rice-rotated systems（34.9 μg·m-3）. The dry deposition of total P（TP）of vegetables and rice-rotated systems which was mainly distributed in winter and spring（from January to April）were 0.233 and 0.084 kg·hm-2, respectively, of which the dissolved TP （DTP）accounted for more than 90%, and the vegetable system was significantly higher than that of the rice-rotated system（P<0.01）. The wet depositions of TP in vegetable and rice-rotated systems were 0.72 and 0.91 kg·hm-2, respectively, and DTP was also the main type of P depositions. The TP depositions in vegetable and rice-rotated rotation ecosystems were both dominated by wet deposition, which accounted for 75.6% and 91.6%, respectively, and the TP depositions in summer and autumn（from June to November）accounted for 70.7% and 76.4% of the total annual deposition, respectively. Wind speed, particulate phosphorus concentration, atmospheric humidity and precipitation were the key influencing factors of phosphorus dry deposition, while wind speed, atmospheric temperature, humidity and precipitation were the key influencing factors of phosphorus wet deposition. It can be seen that crop planting patterns and meteorological factors affected PM2.5, rainfall and phosphorus deposition rate, which thereby changed the dry and wet phosphorus deposition rates in different farmland systems. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
