Search results for: Baozhang Chen

Items from 1 to 20 out of 24 results

article

A meta‐analysis highlights globally widespread potassium limitation in terrestrial ecosystems

Baozhang Chen, Jingchun Fang, Shilong Piao, Philippe Ciais, more

Potassium (K⁺) is the most abundant inorganic cation in plant cells, playing a critical role in various plant functions. However, the impacts of K on natural terrestrial ecosystems have been less studied compared with nitrogen (N) and phosphorus (P). Here, we present a global meta‐analysis aimed at quantifying the response of aboveground production to K addition. This analysis is based on 144 field...

article

Anthropogenic activities dominated tropical forest carbon balance in two contrary ways over the Greater Mekong Subregion in the 21st century

Baozhang Chen, Alphonse Kayiranga, Mengyu Ge, Philippe Ciais, more

Global Change Biology > 29 > 12 > 3421 - 3432

The tropical forest carbon (C) balance threatened by extensive socio‐economic development in the Greater Mekong Subregion (GMS) in Asia is a notable data gap and remains contentious. Here we generated a long‐term spatially quantified assessment of changes in forests and C stocks from 1999 to 2019 at a spatial resolution of 30 m, based on multiple streams of state‐of‐the‐art high‐resolution satellite...

article

Multimodel‐based analyses of evapotranspiration and its controls in China over the last three decades

Shaobo Sun, Zhaoliang Song, Xi Chen, Tiejun Wang, more

Ecohydrology > 13 > 3 > n/a - n/a

Evapotranspiration (ET) plays a key role in linking water, energy, and carbon cycles. However, at regional scales, variations and controls of ET are still not well understood, due to the substantial uncertainties in ET estimates. Here, the variations in ET over China during the last three decades and their drivers and controls were analysed at monthly, seasonal, and annual scales, using well‐evaluated...

article

A regional data assimilation system for estimating CO surface flux from atmospheric mixing ratio observations—a case study of Xuzhou, China

Lijiang Lu, Baozhang Chen, Lifeng Guo, Huifang Zhang, more

Environmental Science and Pollution Research > 2019 > 26 > 9 > 8748-8757

Carbon monoxide (CO) emission inventory data are crucial for air quality control. However, the emission inventories are labor-intensive and time-consuming and generally have large uncertainties. In this study, we developed a new regional data assimilation system (TracersTracker) for estimating the surface CO emission flux from continuous mixing ratio observations using the proper orthogonal decomposition...

article

Local perceptions of the conversion of cropland to forestland program in Jiangxi, Shaanxi, and Sichuan, China

Guangyu Wang, Oliver Z. Ma, Liguo Wang, Anil Shrestha, more

Journal of Forestry Research > 2019 > 30 > 5 > 1833-1847

Numerous land-use policies have been implemented in China in recent decades for ecological restoration and conservation to reduce environmental disasters and promote environmental sustainability. Many of these policies follow a top-down approach to implementation and as such, emphasize the hierarchical control within government structures. An understanding of local perceptions of land-use policies...

article

Spatio-temporal variations in water use efficiency and its drivers in China over the last three decades

Shaobo Sun, Zhaoliang Song, Xiuchen Wu, Tiejun Wang, more

Ecological Indicators > 2018 > 94 > P1 > 292-304

Ecosystem water use efficiency (WUE) reflects the intimately coupled relationship between the carbon and water cycles in terrestrial ecosystems. However, the inter-annual variation and its drivers of WUE are poorly understood at regional/global scale, due to either limited data availability or uncertainties in current data streams. In this study, we used process-based models simulated gross primary...

article

Monitoring carbon dioxide from space: Retrieval algorithm and flux inversion based on GOSAT data and using CarbonTracker-China

Dongxu Yang, Huifang Zhang, Yi Liu, Baozhang Chen, more

Advances in Atmospheric Sciences > 2017 > 34 > 8 > 965-976

Monitoring atmospheric carbon dioxide (CO₂) from space-borne state-of-the-art hyperspectral instruments can provide a high precision global dataset to improve carbon flux estimation and reduce the uncertainty of climate projection. Here, we introduce a carbon flux inversion system for estimating carbon flux with satellite measurements under the support of “The Strategic Priority Research Program of...

article

Seasonal fluctuations of photosynthetic parameters for light use efficiency models and the impacts on gross primary production estimation

Xiaofeng Lin, Baozhang Chen, Jing Chen, Huifang Zhang, more

Agricultural and Forest Meteorology > 2017 > 236 > C > 22-35

How parameterization improves Light-use efficiency (LUE) models by taking into account the seasonal variations of the maximum LUE (εmax) has been rarely investigated. The LUE models include two categories which are the one-leaf LUE model (SL-LUE) and the two-leaf LUE model (TL-LUE) with separation of sunlit and shaded leaves (εmsu and εmsh). In this study, the SL-LUE and TL-LUE models were parameterized...

article

Comparison of remotely-sensed and modeled soil moisture using CLM4.0 with in situ measurements in the central Tibetan Plateau area

Shaobo Sun, Baozhang Chen, Jing Chen, Mingliang Che, more

Cold Regions Science and Technology > 2016 > 129 > C > 31-44

Remotely sensed and modeled soil moisture products are widely used in hydro-meteorological, agricultural and other applications. However, both of them need to be validated by ground measurements before they can be used for different applications. Three remotely sensed soil moisture products and the simulated soil moisture using the Community Land Model version 4.0 (CLM4.0) were compared and verified...

article

Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Shaobo Sun, Baozhang Chen, Mengyu Ge, Junfeng Qu, more

Ecological Modelling > 2016 > 330 > C > 1-15

Most current land surface models (LSMs) show poor performance in soil water and temperature simulations for cold regions because of the inappropriate model structures and ill-parameterizations. This study aims to explore how to parameterize soil organic carbon (SOC) in term of soil moisture simulations using the Community Land Model version 4.0 (CLM4.0) model and the Dynamic Land Model version 1.0...

article

Comparing simulated atmospheric carbon dioxide concentration with GOSAT retrievals

Huifang Zhang, Baozhang Chen, Guang Xu, Jianwu Yan, more

Chinese Science Bulletin > 2015 > 60 > 3 > 380-386

Satellite observations of atmospheric carbon dioxide (CO ₂ ) provide a useful way to improve the understanding of global carbon cycling. In this paper, we present a comparison between simulated CO ₂ concentrations from an inversion model of the CarbonTracker Data Assimilation System (CTDAS) and satellite-based CO ₂ measurements of column-averaged dry air...

article

Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia

Colin J Ferster, Ja (Tony) Trofymow, Nicholas C Coops, Baozhang Chen, more

Forest Ecosystems > 2015 > 2 > 1 > 1-19

Background The global network of eddy-covariance (EC) flux-towers has improved the understanding of the terrestrial carbon (C) cycle, however, the network has a relatively limited spatial extent compared to forest inventory data and plots. Developing methods to use inventory-based and EC flux measurements together with modeling approaches is necessary evaluate forest C dynamics across broad spatial...

article

Spatial and temporal variations in the end date of the vegetation growing season throughout the Qinghai–Tibetan Plateau from 1982 to 2011

Mingliang Che, Baozhang Chen, John L. Innes, Guangyu Wang, more

Agricultural and Forest Meteorology > 2014 > 189-190 > Complete > 81-90

The spatial and temporal variations in the end date of the vegetation growing season (EGS) and their relationships with climate factors across the Qinghai–Tibetan Plateau yet have not been well researched. In this study, we used the rate of the change in the curvature of the S-curve function which integrated a logistic function and an asymmetric Gaussian function and showed a better performance for...

article

Changes in vegetation photosynthetic activity trends across the Asia–Pacific region over the last three decades

Baozhang Chen, Guang Xu, Nicholas C. Coops, Philippe Ciais, more

Remote Sensing of Environment > 2014 > 144 > Complete > 28-41

The updated Global Inventory Modeling and Mapping Studies (GIMMS) third generation global satellite Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) dataset provides very detailed global information on the state of vegetation from 1982 to 2011. Using these data we investigated the changes in the vegetation photosynthetic activity in the Asia–Pacific (AP)...

article

Estimating landscape net ecosystem exchange at high spatial–temporal resolution based on Landsat data, an improved upscaling model framework, and eddy covariance flux measurements

Dongjie Fu, Baozhang Chen, Huifang Zhang, Juan Wang, more

Remote Sensing of Environment > 2014 > 141 > Complete > 90-104

More accurate estimation of the carbon dioxide flux depends on the improved scientific understanding of the terrestrial carbon cycle. Remote-sensing-based approaches to continental-scale estimation of net ecosystem exchange (NEE) have been developed but coarse spatial resolution is a source of errors. Here we demonstrate a satellite-based method of estimating NEE using Landsat TM/ETM+data and an upscaling...

article

Assessing scalar concentration footprint climatology and land surface impacts on tall-tower CO₂ concentration measurements in the boreal forest of central Saskatchewan, Canada

Baozhang Chen, Huifang Zhang, Nicholas C. Coops, Dongjie Fu, more

Theoretical and Applied Climatology > 2014 > 118 > 1-2 > 115-132

Reducing the large uncertainties in current estimates of CO₂ sources and sinks at regional scales (10²–10⁵ km²) is fundamental to improving our understanding of the terrestrial carbon cycle. Continuous high-precision CO₂ concentration measurements on a tower within the planetary boundary layer contain information on regional carbon fluxes; however, its spatial representativeness is generally unknown...

article

Characterizing spatial representativeness of flux tower eddy-covariance measurements across the Canadian Carbon Program Network using remote sensing and footprint analysis

Baozhang Chen, Nicholas C. Coops, Dongjie Fu, Hank A. Margolis, more

Remote Sensing of Environment > 2012 > 124 > Complete > 742-755

We describe a pragmatic approach for evaluating the spatial representativeness of flux tower measurements based on footprint climatology modeling analyses of land cover and remotely sensed vegetation indices. The approach was applied to the twelve flux sites of the Canadian Carbon Program (CCP) that include grassland, wetland, and temperate and boreal forests across an east–west continental gradient...

article

How climate and vegetation type influence evapotranspiration and water use efficiency in Canadian forest, peatland and grassland ecosystems

Christian Brümmer, T. Andrew Black, Rachhpal S. Jassal, Nicholas J. Grant, more

Agricultural and Forest Meteorology > 2012 > 153 > Complete > 14-30

The effects of climatic factors and vegetation type on evapotranspiration (E) and water use efficiency (WUE) were analyzed using tower-based eddy-covariance (EC) data for nine mature forest sites, two peatland sites and one grassland site across an east–west continental-scale transect in Canada during the period 2003–2006. The seasonal pattern of E was closely linked to growing-season length and rainfall...

article

Modeling to discern nitrogen fertilization impacts on carbon sequestration in a Pacific Northwest Douglas‐fir forest in the first‐postfertilization year

BAOZHANG CHEN, NICHOLAS C. COOPS, T. ANDY BLACK, RACHHPAL S. JASSAL, more

Global Change Biology > 17 > 3 > 1442 - 1460

This study investigated how nitrogen (N) fertilization with 200 kg N ha⁻¹ of urea affected ecosystem carbon (C) sequestration in the first‐postfertilization year in a Pacific Northwest Douglas‐fir (Pseudotsuga menziesii) stand on the basis of multiyear eddy‐covariance (EC) and soil‐chamber measurements before and after fertilization in combination with ecosystem modeling. The approach uses a data‐model...

article

Assessing eddy-covariance flux tower location bias across the Fluxnet-Canada Research Network based on remote sensing and footprint modelling

Baozhang Chen, Nicholas C. Coops, Dongjie Fu, Hank A. Margolis, more

Agricultural and Forest Meteorology > 2011 > 151 > 1 > 87-100

We describe an approach for evaluating the representativeness of eddy covariance flux measurements and assessing sensor location bias (SLB) based on footprint modelling and remote sensing. This approach was applied to the 12 main sites of the Fluxnet-Canada Research Network (FCRN)/Canadian Carbon Program (CCP) located along an east-west continental-scale transect, covering grassland, forest, and wetland...

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INFONA - science communication portal

Search results for: Baozhang Chen

A meta‐analysis highlights globally widespread potassium limitation in terrestrial ecosystems

Anthropogenic activities dominated tropical forest carbon balance in two contrary ways over the Greater Mekong Subregion in the 21st century

Multimodel‐based analyses of evapotranspiration and its controls in China over the last three decades

A regional data assimilation system for estimating CO surface flux from atmospheric mixing ratio observations—a case study of Xuzhou, China

Local perceptions of the conversion of cropland to forestland program in Jiangxi, Shaanxi, and Sichuan, China

Spatio-temporal variations in water use efficiency and its drivers in China over the last three decades

Monitoring carbon dioxide from space: Retrieval algorithm and flux inversion based on GOSAT data and using CarbonTracker-China

Seasonal fluctuations of photosynthetic parameters for light use efficiency models and the impacts on gross primary production estimation

Comparison of remotely-sensed and modeled soil moisture using CLM4.0 with in situ measurements in the central Tibetan Plateau area

Improving soil organic carbon parameterization of land surface model for cold regions in the Northeastern Tibetan Plateau, China

Comparing simulated atmospheric carbon dioxide concentration with GOSAT retrievals

Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia

Spatial and temporal variations in the end date of the vegetation growing season throughout the Qinghai–Tibetan Plateau from 1982 to 2011

Changes in vegetation photosynthetic activity trends across the Asia–Pacific region over the last three decades

Estimating landscape net ecosystem exchange at high spatial–temporal resolution based on Landsat data, an improved upscaling model framework, and eddy covariance flux measurements

Assessing scalar concentration footprint climatology and land surface impacts on tall-tower CO₂ concentration measurements in the boreal forest of central Saskatchewan, Canada

Characterizing spatial representativeness of flux tower eddy-covariance measurements across the Canadian Carbon Program Network using remote sensing and footprint analysis

How climate and vegetation type influence evapotranspiration and water use efficiency in Canadian forest, peatland and grassland ecosystems

Modeling to discern nitrogen fertilization impacts on carbon sequestration in a Pacific Northwest Douglas‐fir forest in the first‐postfertilization year

Assessing eddy-covariance flux tower location bias across the Fluxnet-Canada Research Network based on remote sensing and footprint modelling

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