| 不同有机种植年限菜地的温室气体排放特征及影响因素 |
| 摘要点击 1251 全文点击 196 投稿时间：2024-01-07 修订日期：2024-03-28 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 温室气体 有机种植年限 全球增温潜势 排放强度 菜地 |
| 英文关键词 greenhouse gases organic planting years global warming potential emission intensity vegetable field |
|
| 中文摘要 |
| 为明确不同有机种植年限菜地温室气体排放（CO2、CH4和N2O）特征及综合温室效应,以松华坝有机种植10 a、6 a、3 a和常规种植菜地为研究对象,分析不同有机种植年限菜地温室气体排放通量、排放强度（GHGI）和增温潜势（GWP）的差异及其影响因素.结果表明,有机种植处理CO2排放量均高于常规,而N2O和CH4排放量正相反；与常规种植相比,有机种植10 a、6 a、3 a处理的CO2排放通量和累计排放量分别增加了121.28%和40.44%、144.61%和51.39%、130.10%和41.77%（P<0.05）,N2O的排放通量和累计排放量分别降低了26.08%和186.03%、9.6%和3.55%、35.9%和151.78%；CH4排放通量表现为：常规种植>有机种植10 a>有机种植6 a>有机种植3 a,常规种植和有机种植10 a处理的CH4排放表现为“源”,而有机种植6 a和3 a处理的CH4排放表现为“汇”.有机种植10 a和3 a处理的GWP和GHGI比常规种植分别降低了40.57%和61.43%、43.83%和57.98%（P<0.05）,有机种植蔬菜产量略有降低,但却显著降低了GWP和GHGI（P<0.05）.土壤温湿度、SOC和无机氮是影响处理间温室气体排放差异的关键因素.可见,有机种植显著降低了菜地的温室气体排放,而不同有机种植年限温室气体排放的差异与土壤有机碳和无机氮密切相关,研究结果可为有机种植蔬菜生产体系的固碳减排和绿色发展提供科学依据. |
| 英文摘要 |
| To clarify the characteristics of greenhouse gas emissions （CO2, CH4, and N2O） and the comprehensive greenhouse effect from vegetable fields with different organic planting years, the differences in greenhouse gas emission flux, emission intensity （GHGI）, and global warming potential （GWP） and their influencing factors among vegetable fields with different organic planting years in Songhuaba, including 10 years, 6 years, 3 years, and conventional planting, were analyzed. The results showed that the CO2 emissions from organic planting treatments were higher than those from conventional planting, whereas the N2O and CH4 emissions were the opposite. Compared to those from conventional planting, the CO2 emission fluxes and cumulative emissions from organic cultivation for 10, 6, and 3 years increased by 121.28% and 40.44%, 144.61% and 51.39%, and 130.10% and 41.77% （P < 0.05）, respectively, and the N2O emission fluxes and cumulative emissions decreased by 26.08% and 186.03%, 9.6% and 3.55%, and 35.9% and 151.78%, respectively. The CH4 emission flux was shown as follows： conventional planting > organic planting for 10 years > organic planting for 6 years > organic cultivation for 3 years, and the CH4 emissions from cultivational planting and organic planting for 10 years were shown as “source,” while the CH4 emissions from organic planting for 6 years and 3 years were shown as “sink.” Compared with those from conventional planting, the GWP and GHGI from organic planting for 10 years and 3 years were reduced by 40.57% and 61.43%, 43.83% and 57.98% （P < 0.05）, respectively. Organic planting slightly reduced the vegetable yield but significantly reduced GWP and GHGI （P < 0.05）. Soil temperature and humidity, SOC, and inorganic nitrogen were the key factors affecting the difference in greenhouse gas emissions between treatments. Organic planting significantly reduced greenhouse gas emissions from vegetable fields, and the differences in greenhouse gas emissions among different years of organic planting were closely related to soil organic carbon and inorganic nitrogen. The research results can provide a scientific basis for carbon sequestration, emission reduction, and the green development of organic vegetable production systems. |
|
|
|
