Evaluation and improvement of MODIS gross primary productivity in typical forest ecosystems of East Asia based on eddy covariance measurements
文献类型：SCI/SSCI论文
| 作者 | Zhang L.; Zhang L. |
| 发表日期 | 2013 |
| 关键词 | Forest ecosystem Gross primary productivity Maximum light use efficiency MODIS GPP Sunlit/shaded leaves terrestrial primary production carbon-dioxide satellite flux model photosynthesis china site variability australia |
| 英文摘要 | Gross primary productivity (GPP) is a major component of carbon exchange between the atmosphere and terrestrial ecosystems and a key component of the terrestrial carbon cycle. Because of the large spatial heterogeneity and temporal dynamics of ecosystems, it is a challenge to estimate GPP accurately at global or regional scales. The 8-day MODerate resolution Imaging Spectroradiometer (MODIS) GPP product provides a near real time estimate of global GPP. However, previous studies indicated that MODIS GPP has large uncertainties, partly caused by biases in parameterization and forcing data. In this study, MODIS GPP was validated using GPP derived from the eddy covariance flux measurements at five typical forest sites in East Asia. The validation indicated that MODIS GPP was seriously underestimated in these forest ecosystems of East Asia, especially at northern sites. With observed meteorological data, fraction of photosynthetically active radiation absorbed by the plant canopy (fPAR) calculated using smoothed MODIS leaf area index, and optimized maximum light use efficiency (epsilon (max)) to force the MOD17 algorithm, the agreement between predicted GPP and tower-based GPP was significantly improved. The errors of MODIS GPP in these forest ecosystems of East Asia were mainly caused by uncertainties in epsilon (max), followed by those in fPAR and meteorological data. The separation of canopy into sunlit and shaded leaves, for which GPP is individually calculated, can improve GPP simulation significantly. |
| 出处 | Journal of Forest Research |
| 卷 | 18 |
| 期 | 1 |
| 页 | 31-40 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1341-6979 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30522]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang L.,Zhang L.. Evaluation and improvement of MODIS gross primary productivity in typical forest ecosystems of East Asia based on eddy covariance measurements. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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