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| Effects of different modifiers on greenhouse gas emissions from dryland apple orchards |
| Received:July 21, 2020 |
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| KeyWord:dryland orchard;soil modifiers;soil moisture;soil temperature;greenhouse gas |
| Author Name | Affiliation | E-mail | | LI Zhao | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China | | | LIU Shuai | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China | | | DING Yan-hong | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China | | | SUN Wen-hao | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China | | | GAO Xiao-dong | Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China | | | ZHAO Xi-ning | Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China | xiningz@aliyun.com |
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| Abstract: |
| In order to explore the effects of different soil modifiers on greenhouse gas emissions from apple(Malus pumila Mill)dryland orchards in Loess hilly region, we set up four treatments, namely:biochar(BC), Bacillus mucilaginosus(JZ), Bacillus subtilis(KC), and Blank control(CK); monitored greenhouse gas emissions(CH4, CO2, and N2O) using static black box-gas chromatography; and comprehensively analyzed and evaluated different soil modifiers in dryland orchards. Results showed that during the test period, the average soil temperature(0~25 cm)of CK, JZ, KC, and BC were 17.4, 17.5, 17.7℃, and 16.9℃, respectively, and the average water-filled pore space(0~20 cm)were 38.23%, 45.66%, 38.93%, and 44.46%, respectively. Compared to CK, JZ and BC significantly increased surface soil moisture(P<0.05). Compared with that of CK treatment, the total absorption of CH4 in the JZ, KC, and BC treatments were decreased by 15.4%, 13.4%, and 28.4%, respectively. Compared with that of CK treatment, the total amount of CO2 emissions was decreased by 0.06%, 4.0%, and 28.8%, respectively. However, the total N2O emission in JZ, KC, and BC treatments was increased by -6.3%, 7.2%, and 103.1%, respectively, compared to that in CK treatment. Overall, it can be seen that among the three modifiers, biochar has the most outstanding comprehensive effect in increasing soil moisture content and N2O emissions and reducing CH4 absorption and CO2 emissions. Comprehensive analysis of the impact of environmental factors such as soil moisture and temperature on greenhouse gas emissions shows that soil temperature is positively correlated with the three greenhouse gases, while soil moisture is negatively correlated with CO2 and N2O. Therefore, it is recommended to apply biochar to dry orchard to achieve the effect of water retention and carbon fixation. |
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