[Analysis of carbon flux of soil and its related factors from Tamarix spp. community in the middle and lower reaches of Tarim River].

ABSTRACT

This study utilized LI-8100 automated soil CO2 flux system to monitor the day change of carbon flux of soil from Tamarix spp. community in the middle and lower reaches of Tarim River. The influence of temperature, groundwater, and soil water on Carbon flux of soil were analyzed. The study show that the curves of day change of soil respiration have a simple peak value, but the maximum flux normally appear until 12 o'clock noon to 16 o'clock differently. Because of influence of cloud cover and wind speed in that time, difference of the day change of carbon flux of soil are obvious. The relations between the soil respiration and underground water, temperature and soil water content in every depth are close; the relations between carbon flux of soil and underground water are extremely prominent, suitable for Cubic model curve. The relations between carbon flux of soil and air temperature and air temperature near the ground surface, ground surface temperature become positively correlated, suitable for Exponent models curves. However, the relations between carbon flux of soil and soil temperature in the 15 cm, 20 cm, 25 cm, 30cm are negatively correlated, suitable for Cubic model curve. At last, this study analyzed the relations between carbon flux of soil and temperature and soil water content by multi- regression, which explain 67% of the changes in carbon flux of soil.