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):439-452. 汇报人：李东丽 文献分享

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

Introduction 01

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

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).

Methods 02

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）

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)

Results and Discussion 03

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.

Methods

Conclusions 04

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.

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