1. 组会汇报
Kosugi Y, Takanashi S, Ohkubo S, et al. CO2, exchange of a tropical rainforest at Pasoh in Peninsular Malaysia[J]. Agricultural & Forest Meteorology, 2008, 148(3):
汇报人：李东丽
文献分享

2. Results and Discussion
Introduction 01
Methods 02
CONTENT
Results and Discussion 03
Conclusions 04

3. Introduction 01

4. Introduction NEE=GPP+Re NEE=Fc+Sc NEE 表示生态系统净碳交换量 GPP表示光合总生产力
Fc 表示通量塔观测的CO2的通量
Sc 冠层储存的CO2

5. Introduction
Clarification of the nature and magnitude of diurnal , seasonal and annual CO2 exchanges in tropical rainforests and what controls the exchanges at different timescales is a primary issue for understanding the role of these exchanges on the global carbon budget.
(e.g. Valentini et al., 2000; Baldocchi et al., 2001).
Uncertainties in the nighttime flux and thus in the annual carbon budget might be especially severe for tropical forests with large sinks and sources year-round and frequent calm atmospheric conditions. Measurements derived using the chamber method can describe nocturnal CO2exchange by using techniques to extrapolate the measurements to entire ecosystems (Anthoni et al., 1999).

6. Methods 02

7. Methods —— Observations
table. 1 Instruments information
Factors
Instruments
Model
Manu factuer
longwave radiation
PIR
Eppley, USA
air temperature
HMP45A,
Vaisala, Finland
humidity
HMP45C
Soil water content
CS515
Campbell Scientific, USA
rainfall
rain gauges
Ota Keiki 34-T, Japan
CO2 flux
Infrared gas analyzer,
LI-7500
Li-Cor, Inc, USA
Wind velocity
Three axis sonic anemometer ,SAT-550
Kaijo, Japan
Fig. 1 site of flux measurement tower
（Pasoh Forest Reserve of theForest Research
Institute Malaysia(FRIM）

8. Methods —— Gap filling policy
Monthly averaged diurnal course
(Figs. 9 and 10 use this data)
(2) cumulative NEE and annual estimation
(Figs. 7 and 8 and Table 1 deal on this data)

9. Results and Discussion03

11. Results and Discussion
Chambers et al. (2004) reported that soil respiration in a Central Amazon forest was 41%of the total ecosystem respiration.
Goulden et al. (1996) reported that the soil respiration for a cool temperate deciduous forest was 67% of the total ecosystem respiration during the summer.
Ohkuboet al. (2007) reported a soil respiration at temperate evergreen Japanese cypress forest, which was 49%of the ecosystem respiration.

12. Methods

14. Conclusions 04

15. Conclusions
The analysis strongly suggested that raw Fc data, even with u* filtering, underestimated the nighttime CO2 efflux as the ecosystem respiration.
Diurnal pattern of CO2 exchange revealed that obvious restriction of canopy photosynthesis in the afternoon was occurred in this forest irrespective of soil moisture.
Seasonal and annual patterns of CO2 exchange reveals that one of the main causes which induce the difference in NEE pattern between Amazonian and Southeast Asian rainforests was not the difference in daytime photosynthesis but the difference in ecosystem respiration related with dry and rainy seasons.

16. Thank you for attention
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