Close relationship between spectral vegetation indices and V-cmax in deciduous and mixed forests
文献类型：SCI/SSCI论文
| 作者 | Zhou Y. L. ; Ju W. M. ; Sun X. M. ; Hu Z. M. ; Han S. J. ; Black T. A. ; Jassal R. S. ; Wu X. C. |
| 发表日期 | 2014 |
| 关键词 | V-cmax spectral vegetation indices ensemble Kalman filter BEPS model ensemble kalman filter terrestrial chlorophyll index gross primary production net ecosystem exchange gap filling strategies boreal aspen forest photosynthetic capacity eddy covariance water fluxes temperature-dependence |
| 英文摘要 | Seasonal variations of photosynthetic capacity parameters, notably the maximum carboxylation rate, V-cmax, play an important role in accurate estimation of CO2 assimilation in gas-exchange models. Satellite-derived normalised difference vegetation index (NDVI), enhanced vegetation index (EVI) and model-data fusion can provide means to predict seasonal variation in V-cmax. In this study, V-cmax was obtained from a process-based model inversion, based on an ensemble Kalman filter (EnKF), and gross primary productivity, and sensible and latent heat fluxes measured using eddy covariance technique at two deciduous broadleaf forest sites and a mixed forest site. Optimised V-cmax showed considerable seasonal and inter-annual variations in both mixed and deciduous forest ecosystems. There was noticeable seasonal hysteresis in V-cmax in relation to EVI and NDVI from 8 d composites of satellite data during the growing period. When the growing period was phenologically divided into two phases (increasing VIs and decreasing VIs phases), significant seasonal correlations were found between V-cmax and VIs, mostly showing R-2>0.95. V-cmax varied exponentially with increasing VIs during the first phase (increasing VIs), but second and third-order polynomials provided the best fits of V-cmax to VIs in the second phase (decreasing VIs). The relationships between NDVI and EVI with V-cmax were different. Further efforts are needed to investigate V-cmax-VIs relationships at more ecosystem sites to the use of satellite-based VIs for estimating V-cmax. |
| 出处 | Tellus Series B-Chemical and Physical Meteorology |
| 卷 | 66 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0280-6509 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/29351]  |
| 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 | Zhou Y. L.,Ju W. M.,Sun X. M.,et al. Close relationship between spectral vegetation indices and V-cmax in deciduous and mixed forests. 2014. |
入库方式： OAI收割
来源：地理科学与资源研究所
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