| 王学霞,张磊,张卫东,倪小会,王甲辰,曹兵,刘东生.种植年限对京郊设施菜地温室气体排放的影响[J].农业环境科学学报,2021,40(7):1601-1610. |
| 种植年限对京郊设施菜地温室气体排放的影响 |
| Effects of cultivation years on the greenhouse gas emission of greenhouse vegetable soils in a Beijing suburb |
| 投稿时间：2020-11-05 |
| DOI：10.11654/jaes.2020-1276 |
| 中文关键词: 种植年限 设施土壤 CO2排放 N2O排放 增温潜势 排放强度 |
| 英文关键词: cultivation years greenhouse soil CO2 emission fluxes N2O emission fluxes warming potential emission intensity |
| 基金项目:北京市农林科学院院创新能力建设项目（KJCX20190401，KJCX20200419）；北京市农林科学院青年基金项目（QNJJ201907） |
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| 中文摘要: |
| 为揭示设施菜地CO2、CH4和N2O 3种温室气体排放对种植年限的响应趋势及影响因素，在北京大兴选取管理措施相同的种植5 a （5Y）、10 a （10Y）、15 a （15Y）、20 a （20Y）的4个日光温室和棚间露天菜地（CK）为研究对象，分析了不同种植年限设施菜地土壤温室气体排放通量及其土壤理化性质、酶活性等因子变化。结果表明：设施菜地3种温室气体对种植年限的响应有所差异，CO2、N2O排放通量与排放总量均表现为随种植年限增加而逐渐增加；与CK相比，种植年限显著增加CO2、N2O排放通量和总量（P<0.05），且N2O排放通量受种植年限的影响更明显；种植年限对CH4排放通量有一定促进作用但影响不显著。种植年限显著增加了设施菜地温室气体的增温潜势（GWP）和排放强度（GHGI）（P<0.05），且N2O对GWP贡献率也呈现出随种植年限增加而增加的趋势。冗余分析发现土壤有机碳（SOC）和NO3--N含量、β-1，4-N-乙酰基氨基葡萄糖苷酶（NAG）和硝酸还原酶（NRA）活性及土壤pH是影响设施菜地土壤温室气体排放的关键因子。设施菜地长期种植通过增加土壤SOC、NO3--N含量，提高NAG、NRA酶活性及降低土壤pH而促进了设施土壤CO2、N2O排放。研究表明，随种植年限增加，设施菜地温室气体排放通量、总量、GWP、GHGI均逐渐增加，因而采取合理措施，适度降低土壤NO3--N含量和提高土壤pH，有助于长期种植设施土壤温室气体减排。 |
| 英文摘要: |
| The response trends for CO2, N2O, and CH4 greenhouse gas emissions（GHGs）and factors influencing them in greenhouse vegetable soils following different numbers of cultivation years were revealed in this study. Open vegetable fields were selected as the control（CK）, while nearby greenhouse vegetable fields under cultivation for 5（Y5）, 10（Y10）, 15（Y15）, and 20 years（Y20）under the same management system were selected for this study. Greenhouse gas emissions in the experimental greenhouse vegetable soils were determined by GHGs fluxes combined with soil physical and chemical properties, enzyme activities, and other environmental factors. The results showed differential responses of the three greenhouse gases according to the cultivation years of vegetable fields. The emission fluxes and total emissions of CO2 and N2O increased significantly（P<0.05）with the increasing number of years in cultivation compared with that of the CK, with N2O emission fluxes being more affected by years in cultivation, whereas the effect of cultivation years on CH4 emission was not significant. The greenhouse gas warming potential（GWP）and emission intensity（GHGI）of greenhouse vegetable soils significantly increased（P<0.05）with an increasing number of years in cultivation, and the contribution rate of N2O to GWP also increased with years in cultivation. Redundancy analysis（RDA）showed that soil organic carbon（SOC）, NO3--N content, β-1,4-N-acetylglucosaminidase（NAG）, nitrate reductase（NRA）, and pH were the key factors to influence the GHGs of greenhouse vegetable fields. Therefore, long-term cultivation of greenhouse vegetables promoted the emission of CO2 and N2O by increasing the content of SOC and NO3--N in soil, improving the activities of NAG and NRA, and reducing soil pH. In conclusion, emission fluxes, total emissions, GWP, and GHGI gradually increase with the increase in years in cultivation. Therefore, reasonable measures should be taken to reduce NO-3-N content and increase in soil pH, which may contribute to decreased GHGs in long-term cultivation of greenhouse vegetable soils. |
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