Results 271 to 280 of about 346,059 (309)

Uncertainty analysis of multiple terrestrial gross primary productivity products

Global Ecology and Biogeography, 2022
AbstractAimGross primary productivity (GPP) of vegetation is an important component of the carbon balance of terrestrial ecosystems. With the development of science and technology, there has been a proliferation of multiple GPP products, yet large uncertainties exist in the global GPP estimated by different GPP products.
Yahai Zhang, Aizhong Ye
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Simulating Gross Primary Productivity of Humid‐Temperate Pastures

Agronomy Journal, 2008
Although most pasture growth models simulate many above‐ and belowground components of the plant community, calibration and validation are usually based only on periodic measurements of aboveground forage yield. This research used daily measurements of gross primary productivity (GPP) to validate the photosynthesis subroutine of the Integrated Farm ...
Skinner, R.H., Corson, Michael S., Gilmanov, T.G.   +2 more
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Gross primary production using related vegetation indices

2012 Dallas, Texas, July 29 - August 1, 2012, 2012
The assessment of carbon dynamics in terrestrial ecosystems is of great importance in global climate change research. Caatinga is an exclusively Brazilian biome, and quite lacking in studies, particularly of carbon sequestered by biome. A major difficulty for studies is a function of no observation data in micrometeorological station. The hyperspectral
null Magna Soelma Beserra de Moura, null Josiclêda Domiciano Galvíncio, null Bernardo Barbosa da Silva, null Celia Cristina Clemente Machado, null Hewerton Alves da Silva, null Tiago Henrique de Oliveira   +5 more
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Global response of terrestrial gross primary productivity to climate extremes

Science of The Total Environment, 2021
Extreme climate events undoubtedly have essential impacts on ecosystem gross primary productivity (GPP), but the global spatio-temporal patterns of GPP responses to climate extremes are unclear. In this study, we analyzed the responses of GPP to temperature and precipitation extremes during historical (1901-2016) and future (2006-2100) periods using ...
Minshu, Yuan, Qiuan, Zhu, Jiang, Zhang, Jinxun, Liu, Huai, Chen, Changhui, Peng, Peng, Li, Mingxu, Li, Meng, Wang, Pengxiang, Zhao   +9 more
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Gross Primary Production of Terrestrial Vegetation

2013
Gross primary production (GPP) of vegetation is the first and important flux of the terrestrial carbon cycle, and there is no direct measurement technique for GPP at ecosystem and landscape scales. A number of satellite-based Light Use Efficiency (LUE) models or Production Efficiency Models (PEM) have been developed to estimate GPP in the past few ...
Xiangming Xiao, Cui Jin, Jinwei Dong
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TURC: A diagnostic model of continental gross primary productivity and net primary productivity

Global Biogeochemical Cycles, 1996
TURC, a diagnostic model for the estimation of continental gross primary productivity (GPP) and net primary productivity (NPP), is presented. This model uses a remotely sensed vegetation index to estimate the fraction of solar radiation absorbed by canopies, and an original parameterization of the relationship between absorbed solar radiation and GPP ...
Anne Ruimy, Gérard Dedieu, Bernard Saugier   +2 more
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Water Constraint is Limiting Global Gross Primary Productivity

2020
<p> </p><p>We use a light use efficiency model (LUE)  to describe gross primary productivity (GPP) from 1982 to 2016 using the GIMMS-3g FPAR record and NASA MERRA-2 reanalysis, and explore how GPP trends and anomalies can be explained using annual changes in temperature and ...
Nima Madani, Nicholas Parazoo, John Kimball, Ashley Ballantyne, Marco Maneta, Sassan Saatchi, Paul Palmer, Zhihua Liu, Torbern Tagesson   +8 more
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On validation of the MODIS gross primary production product

IEEE Transactions on Geoscience and Remote Sensing, 2006
Validation can be defined as "the process of assessing by independent means the quality of the data products derived from the system outputs." Thus, it is necessary to derive alternative sources of data that correspond to the variable in question, in this case the gross primary production as generated from the Moderate Resolution Imaging Spectrometer ...
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Geographical dimensions of terrestrial net and gross primary productivity

Radiation and Environmental Biophysics, 1978
The paper presents a comparative summary of previous attempts by the author to assess and map global primary productivity using environmental parameters as predictors. The individual components of the productivity process, net production, gross production, dark respiration as well as their regional rates are computed for 10 degree latitudinal belts.
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Spatial Scaling Analysis in Gross Primary Production Estimation

2012
Spatial scaling is very important to evaluation terrestrial carbon balance. In this paper, Gross primary production (GPP) are calculated using the Region Production Efficiency Model(REG-PEM) based the Moderate Resolution Imaging Spectrometer(MODIS) and Landsat TM data, respectively, and some issues related to spatial scaling are analyzed.
Shihua Li, Jiangtao Xiao, Zongchen Hu, Zhaoyu Li, Lusheng Zhao   +4 more
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