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| Effects of rainfall and litter on soil greenhouse gas fluxes in artificial poplar forest |
| Received:October 07, 2018 |
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| KeyWord:CO2;litter;rainfall;CH4;temperature sensitivity;greenhouse gas |
| Author Name | Affiliation | E-mail | | CHENG Gong | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China | | | LIU Ting-xi | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China | txliu1966@163.com | | WANG Guan-li | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China | | | DUAN Li-min | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China | | | LI Dong-fang | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China
Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China | |
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| Abstract: |
| The paper was based on the artificial poplar forests in the Horqin sand dune-meadow cascade ecosystem. In the period from May to October in 2017, the author used static chamber-GC (a chromatographic analyzer using gas as a mobile phase, and the type is Agilent 7890B) technique to conduct in situ observation on the greenhouse gas fluxes including CO2, CH4 and N2O. To explore the effects of rainfall and litter on the greenhouse gas fluxes in forest ecosystem, the experiments were divided into three phases:Ⅰ-no litter, Ⅱ-control check and Ⅲ-double litter. The results showed that the CH4 absorption increased in a short period of time after rainfall on May 23 and July 20, and the growth rate on July 20 was much higher than that on May 23 on account of the higher soil temperature. On August 4th, the CH4 absorption significantly decreased when the soil moisture was higher after rainfall. The CH4 flux showed absorption before and after rainfall, and the absorption intensity demonstrated:"I-no litter" > "Ⅱ-control check" > "Ⅲ-double litter". There was a distinctly negative linear correlation between N2O emission and CH4 absorption in the growing season (P<0.05). The average CO2 fluxes in the growing season showed:"Ⅰ-no litter":243.47 mg·m-2·h-1,"Ⅱ-control check":357.14 mg·m-2·h-1, and "Ⅲ-double litter":406.36 mg·m-2·h-1. The soil CO2 flux of the "no-litter" set decreased 30.81%, while the soil CO2 flux of the "double-litter" set increased 13.78%, which can be inferred that the decreasing range of soil CO2 flux caused by litter removal was much greater than the increasing range of soil CO2 flux caused by double litter; the temperature coefficient (Q10) of soil greenhouse gases during the growing season presented:"Ⅰ-no litter" (1.070) > "Ⅱ-control check" (1.046) > "Ⅲ-double litter" (1.011). The impacts of soil CO2 fluxes had to soil temperature under different circumstances of litter treatments were not significantly uneven. |
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