A5001927955- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Forest ecology and management
- Plant responses to elevated CO2
- Climate variability and models
- Remote Sensing in Agriculture
- Fire effects on ecosystems
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Fluid Dynamics and Turbulent Flows
- Aeolian processes and effects
- Remote Sensing and LiDAR Applications
- Wind and Air Flow Studies
- Greenhouse Technology and Climate Control
- Plant Ecology and Soil Science
- Land Use and Ecosystem Services
- Atmospheric chemistry and aerosols
- Tree Root and Stability Studies
- Soil Carbon and Nitrogen Dynamics
- Ecology and Vegetation Dynamics Studies
- Soil and Unsaturated Flow
- Soil erosion and sediment transport
- Plant and animal studies
- Forest Management and Policy
- Urban Heat Island Mitigation
Weizmann Institute of Science
2016-2025
University of Dundee
2001-2011
Technion – Israel Institute of Technology
1998
Abstract This paper discusses the advantages and disadvantages of different methods that separate net ecosystem exchange (NEE) into its major components, gross carbon uptake (GEP) respiration ( R eco ). In particular, we analyse effect extrapolation night‐time values daytime; this is usually done with a temperature response function derived from long‐term data sets. For analysis, used 16 one‐year‐long sets dioxide measurements European US‐American eddy covariance networks. These sites span...
Forests both take up CO2 and enhance absorption of solar radiation, with contrasting effects on global temperature. Based a 9-year study in the forests' dry timberline, we show that substantial carbon sequestration (cooling effect) is maintained large transition zone (precipitation from 200 to 600 millimeters) by shifts peak photosynthetic activities summer early spring, this counteracted longwave radiation (L) suppression (warming effect), doubling forestation shortwave (S) albedo effect....
Abstract The leaf economics spectrum 1,2 and the global of plant forms functions 3 revealed fundamental axes variation in traits, which represent different ecological strategies that are shaped by evolutionary development species 2 . Ecosystem depend on environmental conditions traits comprise communities 4 However, ecosystem largely unknown, limits our understanding how ecosystems respond as a whole to anthropogenic drivers, climate variability 4,5 Here we derive set 6 from dataset surface...
Forestation of the vast global drylands has been considered a promising climate change mitigation strategy. However, its actual climatic benefits are uncertain because forests' reduced albedo can produce large warming effects. Using high-resolution spatial analysis drylands, we found 448 million hectares suitable for afforestation. This area's carbon sequestration potential until 2100 is 32.3 billion tons (Gt C), but 22.6 Gt C that required to balance The net equivalent would offset ~1%...
Abstract Rising atmospheric CO 2 concentrations may lead to increased water availability because the use efficiency of photosynthesis (WUE) increases with in most plant species. This should allow extension afforestation activities into drier regions. Using eddy flux, physiological and inventory measurements we provide first quantitative information on such potential from a 35‐year old system Aleppo pine ( Pinus halepensis Mill.) at edge Negev desert. 2800 ha arid‐land forest contains 6.5 ±...
Abstract. We applied a site evaluation approach combining Lagrangian Stochastic footprint modeling with quality assessment for eddy-covariance data to 25 forested sites of the CarboEurope-IP network. The analysis addresses spatial representativeness flux measurements, instrumental effects on quality, patterns in and performance coordinate rotation method. Our findings demonstrate that application filter could strengthen database, since only one third is situated truly homogeneous terrain....
ABSTRACT Aim The controls of gross radiation use efficiency (RUE), the ratio between primary productivity (GPP) and intercepted by terrestrial vegetation, its spatial temporal variation are not yet fully understood. Our objectives were to analyse synthesize variability GPP RUE climatic for a wide range vegetation types. Location A global sites from tundra rain forest. Methods We analysed dataset on photosynthetic uptake variables 35 eddy covariance (EC) flux spanning 100 2200 mm mean annual...
Abstract The distribution of precipitation inputs into different hydrological components water‐limited forest ecosystems determines water availability to trees and consequently productivity. We constructed a complete budget semi‐arid pine (285 mm annual precipitation) by directly measuring its main components: ( P ), soil content, evapotranspiration ET , eddy covariance), tree transpiration (sap flux), evaporation (soil chambers), intercepted (calculated). Our results indicated that on...
• This study explored possible advantages conferred by the phase shift between leaf phenology and photosynthesis seasonality in a semi-arid Pinus halepensis forest system, not seen temperate sites. Leaf-scale measurements of gas exchange, nitrogen were used on daily, seasonal annual time-scales. Peak was late winter, when high soil moisture, mild temperatures low vapour pressure deficit (DL) allowed rates associated with water- nitrogen-use efficiencies. Self-sustained new needle growth...
Remote sensing of sun-induced chlorophyll fluorescence (SIF) has been suggested as a promising approach for probing changes in global terrestrial gross primary productivity (GPP). To date, however, most studies were conducted situations when/where both SIF and GPP driven by large the absorbed photosynthetically active radiation (APAR) phenology. Here we quantified during short-term intense heat wave at Mediterranean pine forest, which APAR negligible. decreased linearly course wave, while...
Afforestation is an important approach to mitigate global warming. Its complex interactions with the climate system, however, makes it controversial. expected be effective in tropics where biogeochemical and biogeophysical effects act concert; its potential large semi-arid regions remains insufficiently explored. Here, we use a Global Climate Model provide process-based demonstration that implementing measured characteristics of successful afforestation system (2000 ha, ~300 mm mean annual...
Summary Short‐term, intense heat waves (hamsins) are common in the eastern Mediterranean region and provide an opportunity to study resilience of forests such events that predicted increase frequency intensity. The response a 50‐yr‐old Aleppo pine ( Pinus halepensis ) forest hamsin lasting 1–7 d was studied using 10 yr eddy covariance sap flow measurements. highest c . four per month, coinciding with peak productivity period (March–April). During these events, net ecosystem carbon exchange...
Abstract Predictions of warming and drying in the Mediterranean other regions require quantifying such effects on ecosystem carbon dynamics respiration. Long‐term can only be obtained from forests which seasonal drought is a regular feature. We carried out measurements semiarid Pinus halepensis (Aleppo pine) forest aboveground respiration rates foliage, R f , stem, t over 3 years. Component combined with ongoing biometric, net CO 2 flux [net productivity (NEP)] soil were scaled to level...
ABSTRACT Knowledge of the relationship between soil water dynamics and tree use is critical to understanding forest response environmental change in water‐limited ecosystems. However, availability for transpiration ( T t ) cannot be easily deduced from conventional measurements content (SWC), notably because influenced by potential (Ψ s that, turn, depends on characteristics. Using sap flow deriving depth‐dependent retention curves, we quantified ‘transpirable content’ (tSWC) its seasonal...
Land use and land cover changes greatly influence surface energy balance consequently climate, are likely to be associated with the persistent predictions of warming drying throughout Mediterranean other regions. We specifically address question how high radiation load suppressed latent heat flux, intrinsic dry regions, interact climate in these environments. for this purpose a detailed 6-year (2003–2008) study redistribution an open-canopy pine forest. The results show that compared...
Abstract Drought‐related tree mortality had become a widespread phenomenon in forests around the globe. This process leading to these events and its complexity is not fully understood. Trees dry timberline are exposed ongoing drought, available water for transpiration soil can determine their survival chances. Recent drought years led 5%–10% semi‐arid pine forest of Yatir (Israel). The distribution dead trees was, however, highly heterogeneous with parts showing >80% (D plots) others...