|
 |
研究报告目录 |
Quantification of Ecosystem Carbon Exchange Characteristics in a Dominant Subtropical Evergreen Forest Ecosystem |
| ------------------------------------------------------------------------------------------ |
| 出 版 社：APJAS |
| 发表时间：2012 |
| 台 站：
鼎湖山森林生态系统定位研究站
|
| 作 者：李跃林，周国逸，张德强等 |
| 点 击 率：460126 |
| ------------------------------------------------------------------------------------------ |
| 关 键 字(英文)：Dinghushan, eddy covariance, gap filling, CO2 fluxes,net ecosystem exchange |
| 摘 要(英文)：CO2 fluxes were measured continuously for three years (2003-2005) using the eddy covariance technique for the canopy layer with a height of 27 m above the ground in a dominant subtropical evergreen forest in Dinghushan, South China. By applying gapfilling methods, we quantified the different components of the carbon fluxes (net ecosystem exchange (NEE)), gross primary production (GPP) and ecosystem respiration (Reco) in order to assess the effects of meteorological variables on these fluxes and the atmospherecanopy
interactions on the forest carbon cycle. Our results showed that monthly average daily maximum net CO2 exchange of the whole ecosystem varied from −3.79 to −14.24 μmol m−2 s−1 and was linearly
related to photosynthetic active radiation. The Dinghushan forest
acted as a net carbon sink of −488 g C m−2 y−1, with a GPP of 1448 g
Cm−2 y−1, and a Reco of 961 g C m−2 y−1.Using a carboxylase-based
model, we compared the predicted fluxes of CO2 with measurements.
GPP was modelled as 1443 g C m−2 y−1, and the model inversion
results helped to explain ca. 90% of temporal variability of the
measured ecosystem fluxes. Contribution of CO2 fluxes in the
subtropical forest in the dry season (October-March) was 62.2% of
the annual total from the whole forest ecosystem. On average, 43.3%
of the net annual carbon sink occurred between October and December, indicating that this time period is an important stage for uptake of CO2 by the forest ecosystem from the atmosphere. Carbon uptake in the evergreen forest ecosystem is an indicator of the interaction of between the atmosphere and the canopy, especially in terms of driving climate factors such as temperature and rainfall events. We found that the Dinghushan evergreen forest is acting as a carbon sink almost year-round. The study can improve the evaluation of the net carbon uptake of tropical monsoon evergreen forest ecosystem in south China region under climate change conditions. |
| ------------------------------------------------------------------------------------------ |
 李跃林-2012-APJAS-Quantification of ecosystem carbon exchange characteristics in a dominant subtropical evergreen forest ecosystem.pdf |
| 相关文章： |
|
Responses of primary production and vegetation distribution of East China Forest Transect to global change |
|
Interactive effects of symbiotic nitrogen fixation, CO2 elevation and climatic change, on legume plant growth in northern China, a simulation study |
|
Modeling seasonal and diurnal dynamics of stomatal conductance of plants in a semiarid environment |
|
Socio-economic driving forces of arable land conversion: A case study of Wuxian city, China |
|
Effects of Agriophyllum squarrosum seed banks on its colonization in a woving sand dune in Hunshandake sand land of China |
|
Effects of elevated CO2 concentration on growth, water use, yield and grain quality of wheat under two soil water levels |
|
Response of Growth and Water Use Efficiency (WUE) of Spring Wheat to Whole Season CO2 Enrichment and Drought |
|
Effects of burial in sand and seed size on seed germination and seedling emergence in two leguminous shrubs in Otindag Sandland, China |
|
Taihangia rupestris, a rare cliff-dwelling herb: responses to irradiance |
|
Plasticity in R/S ratio, morphology and fitness-related traits in response to reciprocal patchiness of light and nutrients in the stoloniferous herb, Glechoma longituba L |
| 相关文章分页：
共 201 页 2006 条记录 9 3[101][102][103][104][105][106][107][108][109][110]4 :
|
|
|
|
