SPATIAL AND TEMPORAL DYNAMICS OF CO2 CONCENTRATION AND ITS CAU-SES IN XISHUANGBANNA TROPICAL SEASONAL RAIN FOREST, CHINA

doi:10.3773/j.issn.1005-264x.2008.03.004

Abstract

Abstract:

Aims Because of its highly diverse flora and unique climate, Xishuangbanna tropical seasonal rain forest (XTSRF) is one of few areas in China characterized by well-protected primary forest types considered to be tropical rainforest. Compared with other rainforests around the world, XTSRF occurs at higher latitude and altitude. Our aim was to investigate variation of CO₂ concentration at different time scales under this unique climate and special geographical situation and determine how environmental variables formed the temporal pattern of CO₂ concentration.

Methods CO₂ concentration in XTSRF was measured continuously by infrared gas analyzers (Li-7500, Li-Cor, Lincoln, NE, USA) and recorded every 30 min with a data-logger (CR5000); meteorological variables were also measured and recorded. The static chamber method was used to measure soil respiration weekly. Leaf area index was measured in the middle of every month using a forest canopy analyzer (LAI-2000).

Important findings The diurnal pattern of CO₂ concentration above canopy (AC) was consistent through the year, with higher values at daytime and lower values at night due to photosynthesis uptake and respiration release, respectively. In contrast, near the forest floor (NF) diurnal patterns were bimodal in most months, with a second peak in late afternoon. Average variation of CO₂ concentration in a year was larger at AC (622.8-686.5 mg·m^-3) than at NF (659-700 mg·m^-3). Difference of CO₂ concentration between AC and NF was higher in the rainy season than in the dry season, with the largest value (-62.9 mg·m^-3) in October and the smallest (-8.4 mg·m^-3) in December. The “flushing" phenomenon in the early morning was primarily affected by stability of the atmospheric boundary layer. In long foggy days and under low wind velocities, forests in the valley had little air circulation, but local circulation resulted in sharp increases of CO ₂ concentration in the afternoon. CO₂ concentration of NF and AC were dominated by soil respiration and canopy metabolism, respectively.

Key words: tropical seasonal rain forest, CO₂ concentration, airspace above canopy, airspace near floor in canopy, Xishuangbanna

TAN Zheng-Hong, ZHANG Yi-Ping, YU Gui-Rui, SONG Qing-Hai, GAO Ju-Ming, YANG Zhen, SUN Xiao-Min, ZHAO Shuang-Ju. SPATIAL AND TEMPORAL DYNAMICS OF CO₂ CONCENTRATION AND ITS CAU-SES IN XISHUANGBANNA TROPICAL SEASONAL RAIN FOREST, CHINA[J]. Chin J Plant Ecol, 2008, 32(3): 555-567.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2008.03.004

https://www.plant-ecology.com/EN/Y2008/V32/I3/555

Figures/Tables 9

Fig.1 Diurnal variations of monthly averaged CO2 concentration in airspace above canopy (Cup) and near floor in canopy (Cdown) in Xishuangbanna tropical seasonal rain forest in 2006

Fig.2 Diurnal variations of difference of CO2 concentration between airspaces above canopy and near floor in canopy in Xishuangbanna tropical seasonal rain forest in 2006

Fig.3 Seasonal variations of CO2 concentration in airspace above canopy and near floor in canopy and their differences in Xishuangbanna tropical seasonal rain forest in 2006

Fig.4 Seasonal variations of environmental factors in Xishuangbanna tropical seasonal rain forest in 2006

Fig.5 Diurnal variations of atmospheric stability frequency distribution in airspace above canopy in Xishuangbanna seasonal tropical rain forest in 2004 (Yang et al., 2007)

Fig.6 Diurnal variations of wind direction in airspace above canopy in Xishuangbanna seasonal tropical rain forest in 2006

Fig.7 Relationships between CO2 concentrations and environmental factors at seasonal scale in Xishuangbanna tropical seasonal rain forest in 2006

Table 1 Correlation coefficient of CO2 and environmental factors in Xishuangbanna tropical seasonal rain forest in 2006

	4.2 m高处光合有效辐射 Photosynthetically active radiation at 4.2 m height	70 m高处光合有效辐射 Photosynthetically active radiation at 70 m height	叶面积指数 Leaf area index	冠层温度 Canopy temperature	5 cm深处土壤温度 Soil temperature at 5 cm depth	5 cm深处土壤湿度 Soil moisture at 5 cm depth	土壤呼吸 Soil respiration flux
48.8 m高处CO₂浓度 CO₂ concentration at height of 48.8 m	0.29	0.21	-0.63	-0.30	-0.44	-0.44	-0.46
4.2 m高处CO₂浓度 CO₂ concentration at height of 4.2 m	0.46	0.49	-0.12	0.75	0.63	0.41	0.60

Fig.8 Inter-annual variations of soil temperature at depth of 5 cm and soil water content at depth of 5 cm in Xishuangbanna tropical seasonal rain forest from 2003 to 2006

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SPATIAL AND TEMPORAL DYNAMICS OF CO₂ CONCENTRATION AND ITS CAU-SES IN XISHUANGBANNA TROPICAL SEASONAL RAIN FOREST, CHINA

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