Showing papers in "Journal of Arid Environments in 2001"

TL;DR: In this paper, a rainfall time-series (1967-1997) in a typical Mediterranean semi-arid area in SE Spain of great ecological interest was studied, including rainfall volume, number of rain-days and one-day maximum rainfalls.

TL;DR: In this paper, the role of stream flow regimes in structuring riparian plant communities, and assesses various ways in which riparian plants can be restored by naturalizing ecological processes.

TL;DR: In this paper, the authors test the relationship between remotely sensed indicators of vegetation, rainfall data and field measurements of biomass and floristic composition and find that degradation can be measured by: (1) a decrease in the resilience of vegetation to droughts; (2) a decreasing in rain-use efficiency; and (3) a modification of floric composition.

TL;DR: Wang et al. as discussed by the authors assessed the effects of land use and landscape position on soil nutrients consisting of soil organic matter (SOM), total N (TN), total P (TP), available N (AN) and available P (AP) from three transects in a small catchment on the loess plateau, China.

TL;DR: In this article, root systems of 11 shrub or shrub-like species, 11 grass species, 19 perennial forb species and four annual forb species were excavated on the Jornada Experimental Range in the northern Chihuahuan Desert in southern New Mexico, U.S.A.

TL;DR: In this article, the influence of these biological soil crusts on the uptake of bio-essential elements is reported for the first time for six seed plants of the deserts of Utah.

TL;DR: In this article, the authors used field remote sensing and modelling observations from a degraded Mojave Desert shrubland to develop a model of the progressive degradation of areas adjacent to sites of direct anthropogenic disturbance.

TL;DR: In this article, the degree of spatial variability of soil moisture and the ability of environmental attributes to predict that variability were studied at the Da Nangou catchment (3.5 km(2)) in the semi-arid loess area of China.

TL;DR: In this article, the authors used Landsat Thematic Mapper (TM) satellite data to produce maps depicting ranges of major vegetation types at the Jornada Experimental Range, New Mexico, USA.

TL;DR: The arid steppes north of the Sahara occupy an area of some 630,000 km, between the isohyets of 100 and 400 mm of mean annual rainfall, from the Red Sea to the Atlantic Ocean, and are home to some 2630 species of vascular plants.

TL;DR: In this paper, the effect of leachate from the major landfill in northern Jordan, El-Akader on the ground-water was investigated, including pH, total hardness, electrical conductivity, and total dissolved solids for the physical parameters.

TL;DR: The hypothesis that in desert environments different plant life-forms utilise different germination strategies to persist is supported, as there was a SWP threshold below which germination time and t 50 increased and germinability decreased.

TL;DR: In this article, the threshold values for Icelandic sand were determined with automatic sensors and dust traps, which are influenced by the surface roughness and the texture of the sand, and coarse, light density tephra > 1 mm is easily moved by the wind.

TL;DR: In this article, an integral part of Guhiya basin (with an area of 1614 km2) was studied for priority watershed delineation with the objective of selecting watersheds to under take soil and water conservation measures using remote sensing and Geographical Information System (GIS) techniques.

TL;DR: In this article, climate data at both survey and detailed scale were analyzed to investigate these constraints more quantitatively, and the results show that rainfall can vary considerably even within a few kilometres distance and on different time scales which means that crop yields are very unpredictable.

TL;DR: In this paper, the effects of salt stress and water stress on four native riparian species and one invasive species collected from the lower Colorado River, Mexico were compared in two greenhouse experiments.

TL;DR: In this article, a method of measuring above-ground plant biomass and production that can be applied consistently among vegetation types and that generates seasonal, spatially-explicit results is presented.

TL;DR: In this article, a mass conservation method was used to estimate the zero-plane displacement height of standing vegetation, and the drag coefficients and roughness length were derived by a curve-fit method.

TL;DR: The Colorado River delta in Mexico has been partially revegetated following 20 years of water flows from the United States as discussed by the authors, which has returned native trees and other vegetation to the riparian corridor.

TL;DR: In this article, the relationship between three commonly-used vegetation indices (VIs), percent vegetation cover (% cover) and leaf area index (LAI) over a complex riparian landscape in the Colorado River delta, Mexico was investigated.

TL;DR: In arid areas of north-west China, fluorides occur predominantly as NaF and KF and are fairly ubiquitous in both natural surface waters such as rivers, lakes and reservoirs, and in ground-water as mentioned in this paper.

TL;DR: Cattle mortality in terms of age-sex classes; calves, immature animals, breeding females and mature males were compared to understand drought impacts, while relative growth rates of herds and percentage of recovery to pre-drought cattle population levels were determined to understand recovery.

TL;DR: It is suggested that human selection has favoured seedling vigour and a greater germination capacity in cultivated variants of the columnar cactus Stenocereus stellatus.

TL;DR: The effects of temperature, NaCl, and polyethylene glycol (PEG)-6000 on the seed germination of five non-halophytic Chinese desert shrub species were investigated and the rehabilitation of desertified lands in China by seed dispersal is discussed.

TL;DR: It is suggested that while seed predation reduces the number of seeds in the seed bank, inadequate rainfall limits A. erioloba seedling establishment, even during years with average annual rainfall.

TL;DR: An analysis based on phylogenetic information shows that the Northern and Uspallata-Calingasta areas of endemism reflect different values with respect to their biodiversity, whereas the remaining areas are delimited by climatic barriers.

TL;DR: Analysis of the effects of temperature, pretreatment and water potential has enabled definition of the germinative properties of seven Sahelian leguminous species and showed that they are able to germinate at relatively low water potentials.

TL;DR: In a suite of experiments, seeds of three native woody species, Baccharis salicifolia, Populus fremontii, Salix gooddingii, and an exotic, Tamarix ramosissima, were sown in greenhouse pots as discussed by the authors.

TL;DR: In this paper, the authors used past flows and existing tree populations to estimate that a February-April flow of 3×10 9 m 3 at 80-120 m 3 s −1 is sufficient to germinate and establish new cohorts of native trees.