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[1]MENG Haojun,ZHAO Weijun,LEI Jun,et al.Daily Variation Process of Soil CO2 Flux of Alpine Meadow Wetland in Heihe River Basin[J].Research of Soil and Water Conservation,2016,23(02):189-193.

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Daily Variation Process of Soil CO₂ Flux of Alpine Meadow Wetland in Heihe River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 02 Page number: 189-193 Column: Public date: 2016-04-28

Title:: Daily Variation Process of Soil CO₂ Flux of Alpine Meadow Wetland in Heihe River Basin

Author(s):: MENG Haojun¹, ZHAO Weijun¹, LEI Jun¹, LUO Longfa², MIAO Yuxin¹; 1. Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province, Key Laboratory of Hydrology and Water Resources of Forest Ecology and Frozen Soil of Gansu Province, Zhangye, Gansu 734000, China;
2. Zhangye Forestry Science and Technology Extension Station, Zhangye, Gansu 734000, China

Keywords:: CO₂ flux; temperature; moisture; alpine meadow wetland; Heihe River Basin

CLC:: S154

DOI:: -

Abstract:: We used measuring system of Li-6400 portable photosynthesis to connect soil respiration chamber of Li-6400-09 in the growing season in 2013 to carry out the positioning trial about CO₂ flux of alpine meadow wetland soil in Heihe Basin. We analyzed the effect of hydrothermal factors on characteristic of CO₂ flux of alpine meadow wetland soil. Results showed that daily average temperature difference of different depth of soil in alpine meadow wetland area went immediately down from 14.5℃ of soil surface to 5.8℃ 20 cm depth, having further effect on soil respiration. Daily variation characteristic of soil CO₂ flux is obvious, and keeping in a lower standard at 8:00—10:00 am, CO₂ flux of soil is 0.81~1.10 μmol/(m²·s), beginning to rise at 11:00, reaching to the peak at 13:00, and the peak is 3.26 μmol/(m²·s), beginning to descend at 18:00, the whole process was single-peak curve; soil CO₂ flux and soil temperature, soil moisture content in 10 cm depth exist different degrees of positive correlation in alpine meadow wetland areas, showing that the change of soil CO₂ flux is controlled by temperature and moisture.

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