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《Journal of Tropical and Subtropical Botany》 2005-03
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Dry Season Energy Balance of a Coniferous and Broad-leaved Mixed Forest at Dinghushan Mountain, Southern China

WANG Xu1,2, YIN Guang-cai3, ZHOU Guo-yi1*, YAN Jun-hua1, SUN Ge1,4, WANG Chun-lin1,2 (1. South China Botanical Garden, the Chinese Academy of Sciences, Guangzhou 510650, China; 2. Graduate School of the Chinese Academy of Sciences, Beijing 100010, China; 3. Guangdong University of Technology, Guangzhou 510643, China; 4. Southern Global Change Program, USDA Forest Service, 920 Main Campus Drive, Venture Center II, Suite 300, Raleigh, NC 27606)  
Net radiation and heat fluxes in a coniferous and broad-leaved mixed forest were monitored by a microclimate monitor system, an eddy covariance (EC) open-path system, and soil heat flux plates during January 9-23, 2003 in Dinghushan Mountain, Southern China. The average net radiation (Rn) above the canopy was 53.14 W m-2. The average latent heat flux (LE) and sensible heat flux (Hs) above the canopy were 57.18 W m-2 and 43.40 W m-2, while the LE and Hs below the forest canopy were 12.61 W m-2 and 7.61 W m-2, respectively. The LE and Hs fluxes estimated by the EC and by the Bowen ratio energy balance method were very similar in daytime, but very different in the rest of the day. The diurnal changes of soil heat flux (Gt) were in an "S" shape. The average Gt was -1.50 W m-2,which suggested that soil was one of the heat sources. The total Gt was only 84.0% of the soil heat flux at 5 cm depth, which indicated that the heat stored by the soil should not be ignored in spite of the thin soil layers. A significant correlation (r = 0.8517) between the amount of heat flux (LE+Hs) and available energy (Rn-Gt) with a slope of 0.9128 suggested that the LE and Hs measured by EC at the research site were within the reasonable range reported in the literature.
【Fund】: 中国科学院重要方向项目(KSCX2-SW-120);; 国家重点基础研究发展计划(2002CB1115);; 中国科学院重大项目(KZCX1-SW-01-01A3);; 广东工业大学博士基金项目(043027)资助
【CateGory Index】: S718.5
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