搜索结果: 46-60 共查到“理学 drought”相关记录69条 . 查询时间(0.031 秒)
Drought reduced monoterpene emissions from the evergreen Mediterranean oak Quercus ilex: results from a throughfall displacement experiment
monoterpene emissions evergreen Mediterranean oak Quercus ilex displacement experiment
2010/1/20
The effects of water limitations on the emission of biogenic volatile organic compounds are not well understood. Experimental approaches studying drought effects in natural conditions are still missin...
Effects of summer drought on peat soil solution chemistry in an acid gully mire
dissolved organic carbon flush wetland soil solution chemistry
2009/6/8
In a field experiment to investigate potential impacts of climatic change, a small area of flush wetland in Wales was subjected to three successive years of simulated summer drought/rewetting (autumn...
Soil moisture gradients and controls on a southern Appalachian hillslope from drought through recharge
Soil moisture watersheds
2009/5/27
Soil moisture gradients along hillslopes in humid watersheds, although indicated by vegetation gradients and by studies using models, have been difficult to confirm empirically. While soil properties...
Hydrological response to different time scales of climatological drought：an evaluation of the Standardized Precipitation Index in a mountainous Mediterranean basin
Standardized Precipitation Index drought conditions
2009/5/18
At present, the Standardized Precipitation Index (SPI) is the most widely used drought index to provide good estimations about the intensity, magnitude and spatial extent of droughts. The main advanta...
A global evaluation of streamflow drought characteristics
streamflow drought characteristics
2009/5/13
How drought is characterised depends on the purpose and region of the study and the available data. In case of regional applications or global comparison a standardisation of the methodology to chara...
A precipitation-based regionalization for Western Iran and regional drought variability
Western Iran Precipitation Concentration Index drought variability
2009/5/6
The spatial distribution of the seasonal and annual precipitation was analyzed in western Iran using data from 140 stations covering the period 1965–2000. Applying the Precipitation Concentration Inde...
Recovery from episodic acidification delayed by drought and high sea salt deposition
sea salt deposition episodic acidification
2009/4/29
For the prediction of episodic acidification large uncertainties are connected to climatic variability and its effect on drought conditions and sea-salt episodes. In this study data on 342 hydrologic...
The olive tree：a paradigm for drought tolerance in Mediterranean climates
olive tree drought tolerance Mediterranean climates
2009/4/28
Olive trees (Olea europaea L.) are commonly grown in the Mediterranean basin where prolonged droughts may occur during the vegetative period. This species has developed a series of physiological mecha...
Hydrometeorological and vegetation indices for the drought monitoring system in Tuscany Region,Italy
Hydrometeorological and vegetation indices drought monitoring system Tuscany Region
2010/1/28
We present here the first experiments for an integrated system that is under development for drought monitoring and water resources assessment in Tuscany Region in central Italy. The system is based o...
Effect of drought and fires on the quality of water in Lithuanian rivers
heavy metals river water quality Lithuania
2009/3/12
In August and September 2002, concentrations of heavy metals (copper, lead, and zinc) were 21-74% more than in previous years in Lithuanian rivers. Such a sudden increase in heavy metal pollution redu...
Fluxes and 13C isotopic composition of dissolved carbon and pathways of methanogenesis in a fen soil exposed to experimental drought
Fluxes 13C isotopic composition dissolved carbon pathways methanogenesis
2010/1/18
Peatlands contain a carbon stock of global concern and significantly contribute to the global methane burden. The impact of drought and rewetting on carbon cycling in peatland ecosystems is thus curre...
This paper evaluates climate change effects on drought severity in the region of Thessaly, Greece. The Standardized Precipitation Index (SPI) has been used for estimation of drought severity. A geogra...
Adapting water allocation management to drought scenarios
water allocation management drought scenarios
2009/12/30
Climate change dynamics have significant consequences on water resources on a watershed scale. With water becoming scarcer and susceptible to variation, the planning and reallocation decisions in wate...
Net ecosystem carbon exchange in three contrasting Mediterranean ecosystems – the effect of drought
Net ecosystem carbon exchange Mediterranean ecosystems effect of drought
2010/1/14
Droughts reduce gross primary production (GPP) and ecosystem respiration (Reco), contributing to most of the inter-annual variability in terrestrial carbon sequestration. In seasonally dry climates (M...
Based on the historical records of the drought and flood disasters during 1480-1940AD, this paper reconstructs the sequences of wetness index (WI) and drought and flood disasters. We find ...