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| Effects of cultivation years on the greenhouse gas emission of greenhouse vegetable soils in a Beijing suburb |
| Received:November 05, 2020 |
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| KeyWord:cultivation years;greenhouse soil;CO2 emission fluxes;N2O emission fluxes;warming potential;emission intensity |
| Author Name | Affiliation | E-mail | | WANG Xue-xia | Institute of Plant Nutrition and Resources, Beijing Agricultural Forestry Academy, Beijing 100097, China | | | ZHANG Lei | College of Resource and Environmental Sciences, Hebei Agricultural University, Baoding 071000, China | | | ZHANG Wei-dong | Soil Fertilizer Station of Changping District, Beijing 102200, China | | | NI Xiao-hui | Institute of Plant Nutrition and Resources, Beijing Agricultural Forestry Academy, Beijing 100097, China | | | WANG Jia-chen | Institute of Plant Nutrition and Resources, Beijing Agricultural Forestry Academy, Beijing 100097, China | | | CAO Bing | Institute of Plant Nutrition and Resources, Beijing Agricultural Forestry Academy, Beijing 100097, China | | | LIU Dong-sheng | Institute of Plant Nutrition and Resources, Beijing Agricultural Forestry Academy, Beijing 100097, China | LLSLDS@163.com |
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| Abstract: |
| 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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