نتایج جستجو برای: leaf moisture

تعداد نتایج: 123431  

2009
Matthew D. Powers Kurt S. Pregitzer Brian J. Palik Christopher R. Webster

Overstory conditions influence understory microclimate and resource availability, leading to gradients in evaporative demand andmoisture availability that influence seedlingwater relations. Partial canopies may either reduce seedling moisture stress by ameliorating environmental conditions, or increase moisture stress by reducing soil moisture availability. This study used stable isotope ratios...

2014
Xitian Cai Zong-Liang Yang Cédric H. David Guo-Yue Niu Matthew Rodell

[1] This study evaluates regional-scale hydrological simulations of the newly developed community Noah land surface model (LSM) with multiparameterization options (Noah-MP). The model is configured for the Mississippi River Basin and driven by the North American Land Data Assimilation System Phase 2 atmospheric forcing at 1/8° resolution. The simulations are compared with various observational ...

2017
JUSTIN S. MANKIN JASON E. SMERDON BENJAMIN I. COOK A. PARK WILLIAMS RICHARD SEAGER

Climate models project significant twenty-first-century declines in water availability over the American West from anthropogenic warming. However, the physicalmechanisms underpinning this response are poorly characterized, as are the uncertainties from vegetation’s modulation of evaporative losses. To understand the drivers and uncertainties of future hydroclimate in theAmericanWest, a 35-membe...

2015
Y. Zheng N. Unger M. P. Barkley X. Yue

Atmospheric oxidation of isoprene emission from land plants affects radiative forcing of global climate change. There is an urgent need to understand the factors that control isoprene emission variability on large spatiotemporal scales but such direct observations of isoprene emission do not exist. Two readily available global-scale long-term observation-based data sets hold information about s...

2017
Nathan E. Means Robert J. Kremer

The widespread use of glyphosate-resistant (GR) cropping systems may impact rhizosphere microbial associations and crop productivity. It was previously reported that glyphosate accumulation in the rhizosphere may stimulate colonization of soybean [Glycine max (L.) Merr.] roots by soilborne Fusarium. Field studies often reveal inconsistent root colonization by Fusarium, especially during growing...

2013
Sukumar Dandapat Manoj Kumar Amit Kumar M. P. Sinha

C. tamala leaves are mainly used for flavouring food and spice due to clove like taste and pepper like odour. The plant leaves are widely used in pharmaceutical preparation because of therapeutic efficacy against various diseases and disorders due to presence of different phytochemicals. The leaves were analysed for ash content, moisture, crude fat, crude fibre, crude carbohydrate, crude protei...

Journal: :The New phytologist 2008
Asko Noormets Steve G McNulty Jared L DeForest Ge Sun Qinglin Li Jiquan Chen

* Climate change projections predict an intensifying hydrologic cycle and an increasing frequency of droughts, yet quantitative understanding of the effects on ecosystem carbon exchange remains limited. * Here, the effect of contrasting precipitation and soil moisture dynamics were evaluated on forest carbon exchange using 2 yr of eddy covariance and microclimate data from a 50-yr-old mixed oak...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Guido D Salvucci Pierre Gentine

The ability to predict terrestrial evapotranspiration (E) is limited by the complexity of rate-limiting pathways as water moves through the soil, vegetation (roots, xylem, stomata), canopy air space, and the atmospheric boundary layer. The impossibility of specifying the numerous parameters required to model this process in full spatial detail has necessitated spatially upscaled models that dep...

2013
Jim Speirs Allan Binney Marisa Collins Everard Edwards Brian Loveys

The influence of different levels of irrigation and of variation in atmospheric vapour pressure deficit (VPD) on the synthesis, metabolism, and transport of abscisic acid (ABA) and the effects on stomatal conductance were examined in field-grown Cabernet Sauvignon grapevines. Xylem sap, leaf tissue, and root tissue were collected at regular intervals during two seasons in conjunction with measu...

2015
Veronica Barraza Francisco Grings Paolo Ferrazzoli Alfredo Huete Natalia Restrepo-Coupe Jason Beringer Eva Van Gorsel Haydee Karszenbaum

This study focused on the time series analysis of passive microwave and optical satellite data collected from six Southern Hemisphere ecosystems in Australia and Argentina. The selected ecosystems represent a wide range of land cover types, including deciduous open forest, temperate forest, tropical and semiarid savannas, and grasslands. We used two microwave indices, the frequency index (FI) a...

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