Search results for: Asko Noormets

Items from 1 to 20 out of 49 results

article

COSORE: A community database for continuous soil respiration and other soil‐atmosphere greenhouse gas flux data

Ben Bond‐Lamberty, Danielle S. Christianson, Avni Malhotra, Stephanie C. Pennington, more

Global Change Biology > 26 > 12 > 7268 - 7283

Globally, soils store two to three times as much carbon as currently resides in the atmosphere, and it is critical to understand how soil greenhouse gas (GHG) emissions and uptake will respond to ongoing climate change. In particular, the soil‐to‐atmosphere CO₂ flux, commonly though imprecisely termed soil respiration (R_S), is one of the largest carbon fluxes in the Earth system. An increasing number...

article

Drought and thinning have limited impacts on evapotranspiration in a managed pine plantation on the southeastern United States coastal plain

Xiaodong Liu, Ge Sun, Bhaskar Mitra, Asko Noormets, more

Agricultural and Forest Meteorology > 2018 > 262 > C > 14-23

Managed and natural coastal plain forests in the humid southeastern United States exchange large amounts of water and energy with the atmosphere through the evapotranspiration (ET) process. ET plays an important role in controlling regional hydrology, climate, and ecosystem productivity. However, long-term studies on the impacts of forest management and climatic variability on forest ET are rare,...

article

Microtopography Alters Hydrology, Phenol Oxidase Activity and Nutrient Availability in Organic Soils of a Coastal Freshwater Forested Wetland

Kevan J. Minick, Alexia M. Kelley, Guofang Miao, Xuefeng Li, more

Wetlands > 2019 > 39 > 2 > 263-273

Hummock-hollow microtopography is a unique feature of wetland ecosystems, but our understanding of its effects on soil carbon and nutrient cycling is limited. We investigated effects of microtopography on hydrology, phenol oxidase activity (POX) and nutrient availability in a freshwater forested wetland of coastal North Carolina. Water table depth (WTD) was measured from September 2012 to August 2013...

article

Understanding coastal wetland hydrology with a new regional‐scale, process‐based hydrological model

Yu Zhang, Wenhong Li, Ge Sun, Guofang Miao, more

Hydrological Processes > 32 > 20 > 3158 - 3173

Coastal wetlands represent an ecotone between ocean and terrestrial ecosystems, providing important services, including flood mitigation, fresh water supply, erosion control, carbon sequestration, and wildlife habitat. The environmental setting of a wetland and the hydrological connectivity between a wetland and adjacent terrestrial and aquatic systems together determine wetland hydrology. Yet little...

article

Carbon accumulation in loblolly pine plantations is increased by fertilization across a soil moisture availability gradient

Rosvel Bracho, Jason G. Vogel, Rodney E. Will, Asko Noormets, more

Forest Ecology and Management > 2018 > 424 > C > 39-52

Silvicultural practices, particularly fertilization, may counteract or accentuate the effects of climate change on carbon cycling in planted pine ecosystems, but few studies have empirically assessed the potential effects. In the southeastern United States, we established a factorial throughfall reduction (D) × fertilization (F) experiment in 2012 in four loblolly pine (Pinus taeda L.) plantations...

article

Assessing the interplay between canopy energy balance and photosynthesis with cellulose δ¹⁸O: large-scale patterns and independent ground-truthing

Brent R. Helliker, Xin Song, Michael L. Goulden, Kenneth Clark, more

Oecologia > 2018 > 187 > 4 > 995-1007

There are few whole-canopy or ecosystem scale assessments of the interplay between canopy temperature and photosynthesis across both spatial and temporal scales. The stable oxygen isotope ratio (δ¹⁸O) of plant cellulose can be used to resolve a photosynthesis-weighted estimate of canopy temperature, but the method requires independent confirmation. We compare isotope-resolved canopy temperatures derived...

article

Variability of sun‐induced chlorophyll fluorescence according to stand age‐related processes in a managed loblolly pine forest

Roberto Colombo, Marco Celesti, Remo Bianchi, Petya K. E. Campbell, more

Global Change Biology > 24 > 7 > 2980 - 2996

Leaf fluorescence can be used to track plant development and stress, and is considered the most direct measurement of photosynthetic activity available from remote sensing techniques. Red and far‐red sun‐induced chlorophyll fluorescence (SIF) maps were generated from high spatial resolution images collected with the HyPlant airborne spectrometer over even‐aged loblolly pine plantations in North Carolina...

article

Hydrology and microtopography control carbon dynamics in wetlands: Implications in partitioning ecosystem respiration in a coastal plain forested wetland

Guofang Miao, Asko Noormets, Jean-Christophe Domec, Montserrat Fuentes, more

Agricultural and Forest Meteorology > 2017 > 247 > C > 343-355

Wetlands store a disproportionately large fraction of organic carbon relative to their areal coverage, and thus play an important role in global climate mitigation. As destabilization of these stores through land use or environmental change represents a significant climate feedback, it is important to understand the functional regulation of respiratory processes that catabolize them. In this study,...

article

Productivity, Biomass Partitioning, and Energy Yield of Low-Input Short-Rotation American Sycamore (Platanus occidentalis L.) Grown on Marginal Land: Effects of Planting Density and Simulated Drought

Jean-Christophe Domec, Elissa Ashley, Milan Fischer, Asko Noormets, more

BioEnergy Research > 2017 > 10 > 3 > 903-914

Short-rotation woody crops (SRWC) grown for bioenergy production are considered a more sustainable feedstock than food crops such as corn and soybean. However, to be sustainable SRWC should be deployed on land not suitable for agriculture (e.g., marginal lands). Here we quantified productivity and energy yield of four SRWC candidate species grown at different planting densities (1250, 2500, 5000,...

article

TRACC: an open source software for processing sap flux data from thermal dissipation probes

Eric J. Ward, Jean-Christophe Domec, John King, Ge Sun, more

Trees > 2017 > 31 > 5 > 1737-1742

Key message TRACC is an open-source software for standardizing the cleaning, conversion, and calibration of sap flux density data from thermal dissipation probes, which addresses issues of nighttime transpiration and water storage. Abstract Thermal dissipation probes (TDPs) have become a widely used method of monitoring plant water use in recent years. The use of TDPs requires calibration to a theoretical...

article

Assessment and simulation of global terrestrial latent heat flux by synthesis of CMIP5 climate models and surface eddy covariance observations

Yunjun Yao, Shunlin Liang, Xianglan Li, Shaomin Liu, more

Agricultural and Forest Meteorology > 2016 > 223 > C > 151-167

The latent heat flux (LE) between the terrestrial biosphere and atmosphere is a major driver of the global hydrological cycle. In this study, we evaluated LE simulations by 45 general circulation models (GCMs) in the Coupled Model Intercomparison Project Phase 5 (CMIP5) by a comparison with eddy covariance (EC) observations from 240 globally distributed sites from 2000 to 2009. In addition, we improved...

article

Development of a coupled carbon and water model for estimating global gross primary productivity and evapotranspiration based on eddy flux and remote sensing data

Yulong Zhang, Conghe Song, Ge Sun, Lawrence E. Band, more

Agricultural and Forest Meteorology > 2016 > 223 > C > 116-131

Terrestrial gross primary productivity (GPP) and evapotranspiration (ET) are two key ecosystem fluxes in the global carbon and water cycles. As carbon and water fluxes are inherently linked, knowing one provides information for the other. However, tightly coupled and easy to use ecosystem models are rare and there are still large uncertainties in global carbon and water flux estimates. In this study,...

article

Soil–plant–atmosphere conditions regulating convective cloud formation above southeastern US pine plantations

Gabriele Manoli, Jean‐Christophe Domec, Kimberly Novick, Andrew Christopher Oishi, more

Global Change Biology > 22 > 6 > 2238 - 2254

Loblolly pine trees (Pinus taeda L.) occupy more than 20% of the forested area in the southern United States, represent more than 50% of the standing pine volume in this region, and remove from the atmosphere about 500 g C m

^{- 2}

per year through net ecosystem exchange. Hence, their significance as a major regional carbon sink can hardly be disputed. What is disputed is whether the proliferation of young...

article

Evaluating atmospheric CO2 effects on gross primary productivity and net ecosystem exchanges of terrestrial ecosystems in the conterminous United States using the AmeriFlux data and an artificial neural network approach

Shaoqing Liu, Qianlai Zhuang, Yujie He, Asko Noormets, more

Agricultural and Forest Meteorology > 2016 > 220 > C > 38-49

Quantitative understanding of regional gross primary productivity (GPP) and net ecosystem exchanges (NEE) and their responses to environmental changes are critical to quantifying the feedbacks of ecosystems to the global climate system. Numerous studies have used the eddy flux data to upscale the eddy covariance derived carbon fluxes from stand scales to regional and global scales. However, few studies...

article

Monthly land cover‐specific evapotranspiration models derived from global eddy flux measurements and remote sensing data

Yuan Fang, Ge Sun, Peter Caldwell, Steven G. McNulty, more

Ecohydrology > 9 > 2 > 248 - 266

Evapotranspiration (ET) is arguably the most uncertain ecohydrologic variable for quantifying watershed water budgets. Although numerous ET and hydrological models exist, accurately predicting the effects of global change on water use and availability remains challenging because of model deficiency and/or a lack of input parameters. The objective of this study was to create a new set of monthly ET...

chapter

The Phenology of Gross Ecosystem Productivity and Ecosystem Respiration in Temperate Hardwood and Conifer Chronosequences

Asko Noormets, Jiquan Chen, Lianhong Gu, Ankur Desai

Phenology of Ecosystem Processes > Phenological Phenomena > 59-85

The relative duration of active and dormant seasons has a strong influence on ecosystem net carbon balance and its carbon uptake potential. While recognized as an important source of temporal and spatial variability, the seasonality of ecosystem carbon balance has not been studied explicitly, and still lacks standard terminology. In the current chapter, we apply a curve fitting procedure to define...

book

Phenology of Ecosystem Processes

Asko Noormets, Springer New York

Changes in the seasonal timing of ecosystem carbon, water and energy exchange are key sources of variation in biosphere-atmosphere feedbacks. Referencing this variability to traditional phenological events, such as bud break or flowering, introduces additional uncertainty with little mechanistic relationship to the process of interest. Instead, the seasonal cycles of each process must be understood...

article

Regional validation and improved parameterization of the 3-PG model for Pinus taeda stands

Carlos A. Gonzalez-Benecke, Robert O. Teskey, Timothy A. Martin, Eric J. Jokela, more

Forest Ecology and Management > 2016 > 361 > C > 237-256

The forest simulation model, 3-PG, has the capability to estimate the effects of climate, site and management practices on many stand attributes using easily available data. The model, once calibrated, has been widely applied as a useful tool for estimating growth of forest species in many countries. Currently, there is an increasing interest in estimating biomass and assessing the potential impact...

article

Differential responses of carbon and water vapor fluxes to climate among evergreen needleleaf forests in the USA

Pradeep Wagle, Xiangming Xiao, Thomas E. Kolb, Beverly E. Law, more

Ecological Processes > 2016 > 5 > 1 > 1-17

Introduction Understanding the differences in carbon and water vapor fluxes of spatially distributed evergreen needleleaf forests (ENFs) is crucial for accurately estimating regional or global carbon and water budgets and when predicting the responses of ENFs to current and future climate. Methods We compared the fluxes of ten AmeriFlux ENF sites to investigate cross-site variability in net ecosystem...

article

Testing DRAINMOD-FOREST for predicting evapotranspiration in a mid-rotation pine plantation

Shiying Tian, Mohamed A. Youssef, Ge Sun, George M. Chescheir, more

Forest Ecology and Management > 2015 > 355 > C > 37-47

Evapotranspiration (ET) is a key component of the hydrologic cycle in terrestrial ecosystems and accurate description of ET processes is essential for developing reliable ecohydrological models. This study investigated the accuracy of ET prediction by the DRAINMOD-FOREST after its calibration/validation for predicting commonly measured hydrological variables. The model was tested by conducting an...

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INFONA - science communication portal

Search results for: Asko Noormets

COSORE: A community database for continuous soil respiration and other soil‐atmosphere greenhouse gas flux data

Drought and thinning have limited impacts on evapotranspiration in a managed pine plantation on the southeastern United States coastal plain

Microtopography Alters Hydrology, Phenol Oxidase Activity and Nutrient Availability in Organic Soils of a Coastal Freshwater Forested Wetland

Understanding coastal wetland hydrology with a new regional‐scale, process‐based hydrological model

Carbon accumulation in loblolly pine plantations is increased by fertilization across a soil moisture availability gradient

Assessing the interplay between canopy energy balance and photosynthesis with cellulose δ¹⁸O: large-scale patterns and independent ground-truthing

Variability of sun‐induced chlorophyll fluorescence according to stand age‐related processes in a managed loblolly pine forest

Hydrology and microtopography control carbon dynamics in wetlands: Implications in partitioning ecosystem respiration in a coastal plain forested wetland

Productivity, Biomass Partitioning, and Energy Yield of Low-Input Short-Rotation American Sycamore (Platanus occidentalis L.) Grown on Marginal Land: Effects of Planting Density and Simulated Drought

TRACC: an open source software for processing sap flux data from thermal dissipation probes

Assessment and simulation of global terrestrial latent heat flux by synthesis of CMIP5 climate models and surface eddy covariance observations

Development of a coupled carbon and water model for estimating global gross primary productivity and evapotranspiration based on eddy flux and remote sensing data

Soil–plant–atmosphere conditions regulating convective cloud formation above southeastern US pine plantations

Evaluating atmospheric CO2 effects on gross primary productivity and net ecosystem exchanges of terrestrial ecosystems in the conterminous United States using the AmeriFlux data and an artificial neural network approach

Monthly land cover‐specific evapotranspiration models derived from global eddy flux measurements and remote sensing data

The Phenology of Gross Ecosystem Productivity and Ecosystem Respiration in Temperate Hardwood and Conifer Chronosequences

Phenology of Ecosystem Processes

Regional validation and improved parameterization of the 3-PG model for Pinus taeda stands

Differential responses of carbon and water vapor fluxes to climate among evergreen needleleaf forests in the USA

Testing DRAINMOD-FOREST for predicting evapotranspiration in a mid-rotation pine plantation

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