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[1]CHENG Gong,LIU Tingxi,WANG Guanli,et al.Characteristics of CO2, CH4 and N2O Fluxes in Horqin Dune-Meadow Cascade Ecosystem[J].Research of Soil and Water Conservation,2019,26(04):96-104,110.

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Characteristics of CO₂, CH₄ and N₂O Fluxes in Horqin Dune-Meadow Cascade Ecosystem

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 96-104,110 Column: Public date: 2019-06-11

Title:: Characteristics of CO₂, CH₄ and N₂O Fluxes in Horqin Dune-Meadow Cascade Ecosystem

Author(s):: CHENG Gong^1,3, LIU Tingxi^1,2, WANG Guanli^1,2, DUAN Limin^1,2, MA Liqun¹; 1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot 010018, China;
3. Nanjing Water Conservancy Planning, Design Institute Corporation Limited, Nanjing 210000, China

Keywords:: Horqin; greenhouse gases flux; organic matter; soil temperature; soil moisture

CLC:: S152;X16

DOI:: -

Abstract:: In order to study the variation pattern of greenhouse gas fluxes and the influencing factors in different areas of Horqin sand dune-meadow cascade ecological belt, we used the static chamber-GC technique and conducted in situ observations of CO₂, CH₄ and N₂O fluxes in semi-mobile dunes, semi-fixed dunes, artificial forest land, farmland (maize) and meadows from May to October, 2017, and simultaneously measured soil temperature, soil moisture, total carbon, total phosphorus and total nitrogen. Correlation analysis on greenhouse gas fluxes and the influencing factors showed that the greenhouse gas fluxes in the Horqin sand dune-meadow ecological belt had obvious seasonal changes, which was significantly affected by soil moisture and soil temperature. The combination of the two promoted the absorption or emission of greenhouse gas fluxes. In arid and semi-arid regions, the sensibility of soil greenhouse gas fluxes to soil temperature is highly dependent on soil moisture. The soil greenhouse gas fluxes increase with the increase of the temperature. When soil moisture exceeds the field water holding capacity, the soil greenhouse gas fluxes will decrease with the increase of soil moisture, which affects the response of the soil greenhouse gas fluxes to soil temperature. Temperature sensitivity of CO₂ (Q₁₀) decreased in the order: farmland (4.18) > meadow (2.87) > artificial forest land (2.51) > semi-fixed sand dune (2.41) > semi-mobile dune (2.36). The peak of CO₂ emission appeared in July and August when the hydrothermal condition was better, and the peak around August 22 was significantly higher than that around July 21. The average roll of three greenhouse gas fluxes (converted to CO₂) increased in the order: semi-mobile dunes [181.65 mg/(m²·h)] < semi-fixed dunes [242.16 mg/(m²·h)] < artificial forest land [348.33 mg/(m²·h)] < farmland [405.72 mg/(m²·h)] < meadows [487.63 mg/(m²·h)]. Organic matter and total phosphorus of the soil in the test area also showed the same change. The CO₂ flux in the growing season showed significantly positive correlation with organic matter and total phosphorus of the soil (p < 0.01). Soil N₂O flux is more responsive to soil temperature in the growing season.

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