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[1]ZHANG Na,GONG Zaiwu.Characteristic of CO2 Concentration of Canopy and Its Influencing Factors in Tropical Seasonal Rainforest in Xishuangbanna, China[J].Research of Soil and Water Conservation,2018,25(04):181-188.

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Characteristic of CO₂ Concentration of Canopy and Its Influencing Factors in Tropical Seasonal Rainforest in Xishuangbanna, China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 181-188 Column: Public date: 2018-06-13

Title:: Characteristic of CO₂ Concentration of Canopy and Its Influencing Factors in Tropical Seasonal Rainforest in Xishuangbanna, China

Author(s):: ZHANG Na^1,2, GONG Zaiwu¹; 1. School of Low & Public AFFairs, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. Meteorological Bureau of Yangquan City, Shanxi Province, Yangquan, Shanxi 045000, China

Keywords:: tropical seasonal rainforest; canopy; CO₂ concentration; influencing factors

CLC:: S718

DOI:: -

Abstract:: Based on the observation data in 2015, we analyzed the influencing factors of CO₂ concentration of canopy in tropical seasonal rainforest in Xishuangbanna, China. The results showed that: (1) the diurnal variation of soil temperature in near-surface soil layer demonstrated a sine trend, while it was relatively stable in the deeper soil layers; diurnal change rate of soil temperature decreased with the increase of soil depth, the occurrence time of the peak of soil temperature presented the hysteresis with the increase of soil depth, seasonal difference of soil temperature was significant, the mean soil temperature was higher in the rain season, it was lower in the cold season, it was the medium in the dry and hot season; (2) daily and seasonal CO₂ concentrations in tropical seasonal rainforest showed the significant difference in canopy, on the daily scale, CO₂ concentration above the canopy showed the unimodal type, and CO₂ concentration beneath the canopy showed the bimodal pattern; on seasonal scale, CO₂ concentration above canopy was higher than that beneath the canopy; (3) the daily soil respiration showed the unimodal type, and the peak occurred at 14:00; the soil respiration reached to the peak in July, it sharply declined after July, and it was lowest in December; (4) the exponential model can be used to describe the relationship between soil respiration, CO₂ concentration and canopy temperature (p<0.01); (5) CO₂ concentrations above and beneath the canopy were positively related to photosynthetically active radiation, and the related coefficients beneath the canopy were higher than those above canopy. There was a positive correction between CO₂ concentration and soil respiration, thus, soil respiration can be regarded as the mainly influencing factor on CO₂ concentration in Xishuangbanna, China.

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