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Agriculture in Semi Arid Environments
Manufacturer: Springer
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Binding: Hardcover
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ASIN: 0387094148 |
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Biogeochemistry of Trace Elements in Arid Environments (Environmental Pollution) (Environmental Pollution)
Fengxiang X. Han
Manufacturer: Springer
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ASIN: 1402060238 |
Product Description
Global warming has worsened the water resource crisis in many arid zones worldwide, from Africa to Asia, affecting millions of people and putting them at risk of hunger. Effective management of arid zone resources, including understanding the risks of toxic trace and heavy elements to humans, coupled with the need to produce more food to feed the world s growing population, has thus become increasingly important. This very timely book, the only one of its kind on the market, fills the gap of our knowledge of trace elements in these regions.
Topics include:
- content and distribution
- solution chemistry
- solid-phase chemistry
- selective sequential dissolution techniques
- transfer fluxes
- bioavailability
- pollution and remediation
In order to illustrate the themes, a comprehensive and focused case study is presented, and the book closes with the global perspectives on anthropogenic interferences in the natural trace elements distribution.
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Arid and Semi-arid Environments: Geomorphological and Pedological Aspects (Catena Supplement 14)
Manufacturer: Catena-Verlag
ProductGroup: Book
Binding: Hardcover
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ASIN: 3923381174 |
Book Description
The volume contains selected papers dealing with geomorphic and pedologic aspects of semi-arid and arid zones. They cover a wide range of physiographic conditions, extending over four continents.
Book Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
Floristic diversity, abundance and disappearance of woody species were investigated at four sites of southwestern Niger, two in the semi-arid, two in the arid zone. The woody vegetation was assessed on transects from villages to bush, the measured parameters being number of individuals, height, diameter and number of stems. Questionnaires were used in the field to record information provided by the population for the disappeared species. Sites in the semi-arid zone were species richer than those in the arid zone. In terms of land-use there was a significant difference among and within sites and the number of trees increased with the distance from the village to the bush. A total of 23 species had completely disappeared from the study sites, i.e. five from the semi-arid and 18 from the arid zone. Thirteen different causes of tree species loss were recorded, six of them being of anthropic and seven of natural origin. Four disappeared species were consumed as leaves, buds, flowers and fruits while others were used as firewood and timber. All disappeared species were part of the traditional pharmacopeia. The plantation of useful species is suggested to improve re-introduction.
Book Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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Data on net ecosystem exchange (NEE) dynamics and carbon balance of a dry, extensively managed sandy grassland, as measured in Hungary in the years 2003 and 2004 are reported. The grassland was a weak source of carbon in 2003 (80gCm^-^2), owing to the exceptionally hot and dry conditions while it was a strong sink in 2004 (-188gCm^-^2), when the amount of precipitation was considerably exceeding the 10 years average. Gross primary production (GPP) values in 2003 and 2004 were 584 and 1112gCm^-^2, respectively, while ecosystem respiration (R"e"c"o) values were 663 and 924gCm^-^2 for these 2 years. GPP declined more than R"e"c"o due to drought and heat wave effects in 2003 than in 2004. The ratio between net sink and net source days were 0.55 and 1.11 for 2003 and 2004, respectively. The average of daily NEE sums during source periods did not differ between the 2 years (0.796 and 0.777gCm^-^2day^-^1), while for the sink periods the average of daily NEE sums were strongly different (-0.836 and -1.677gCm^-^2day^-^1, for 2003 and 2004). The main difference between the years was found in late winter source activity associated with low temperatures (2003), the degree of summer drought and the absence (2003) or presence (2004) of autumn regrowth. As sink activity potentially may occur in the period April-June, the amount of winter-early spring precipitation proved to be decisive to the carbon balance of the grassland and was much less in 2003 than in 2004. Significant source activity was found during droughts in each year contributing up to 50% to the total source activity. While in the favourable periods the assimilation and respiration components were correlated, significant ecosystem respiration not coupled to current photosynthesis was responsible for large part of the source activity of the grassland. Good correlations were found between satellite derived normalized difference vegetation index (NDVI) and broadband NDVI (NDVI"b) values in both years. The relation between GPP and the NDVI"b index was significantly different between the main growth periods (April-June) of the 2 years, while it was statistically not significant during the autumn regrowth period (2004).
Book Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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The Fairview Constructed Wetland, a complex of replicated wet meadow (primary filter) and shallow marsh (shallow wetland) cells, was built in southeast Idaho in 1999 and planted with seven native plant species. The development of aboveground biomass and root mass and the accumulation of litter for each cell and for each species are described here. Establishment patterns varied among species and wetlands. Juncus balticus and Carex nebrascensis contributed disproportionately to the biomass in the primary filter cells. In these wetlands, aboveground biomass increased from an overall average of 443 in 2000 to 560g/m^2 in 2003, while root mass increased from 387 to 1108g/m^2. Litter mass increased from 230 in 2001 to 829g/m^2 in 2003. In the shallow wetlands, average aboveground biomass increased from 82 in 2000 to 391g/m^2 in 2003, while root mass increased from 108 to 574g/m^2 over this same period. From 2001 to 2003, litter mass increased from 68 to 214g/m^2. All measures of biomass and litter in the shallow wetlands were less than the corresponding values in the primary filter cells over the same time period. Still, biomass measures differed among shallow wetlands and some of this variation was explained by the differences in each wetland's hydrograph.
Book Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The impact of seed dressing and standing crop treatment (SC) with chlorpyrifos [O,O-diethyl O-(3,5,6-trichloro pyridyl) phosphorothioate] and quinalphos [O,O-diethyl O-quinoxalin-2-yl phosphorothioate] on the oxidative capability of the soils of two semi-arid regions of tropical India were studied by monitoring their dehydrogenase activities (DHA) and capacities for reduction of iron (Fe^3^+) for three consecutive crop seasons. In the sandy loam, the metabolites of quinalphos inhibited both reduction of Fe^3^+ and DHA whereas chlorpyrifos was found stimulatory. The metabolites of chlorpyrifos namely 3,5,6-trichloro-2-pyridinol (TCP) and 3,5,6-trichloro-2-methoxy pyridine (TMP) stimulated DHA but were significantly inhibitory to reduction of Fe^3^+. The stimulatory effect of TCP and TMP suggested their utilization as substrates by soil microbes. In the loamy sand, chlorpyrifos and quinalphos inhibited the overall DHA within a field but stimulated DHA of the rhizospheric microbes. Standing crop treatments with quinalphos and chlorpyrifos caused prolonged inhibitory effects on reduction of Fe^3^+ while seed treatments caused fluxes of shorter durations. The inhibitory effects on reduction of Fe^3^+ were more prolonged with chlopyrifos than with quinalphos. Pesticide treatments at the recommended doses increased the yield of groundnut (Arachis hypogaea L.) pods that had no residual pesticides. Adverse effects of agronomic importance on DHA and reduction of Fe^3^+ were not observed during this study.
Book Description
This digital document is a journal article from Journal of Arid Environments, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The intensification of agriculture has resulted in the loss of many aquatic ecosystems in southern Europe. Despite this, the construction of irrigation pools and reservoirs to retain the water necessary for intensive cultivation may also provide new habitats for macroinvertebrates. The biotic and abiotic attributes of 40 such reservoirs in south-eastern Spain were studied to determine the presence of macroinvertebrates, and to discover if there is such a thing as an optimal design of an artificial pond for maximizing macroinvertebrate richness. A total of 72 macroinvertebrate taxa belonging to 38 families were recorded from the pools examined. Pools constructed with low-density polyethylene covered with sand and stones contained a significantly greater species richness, abundance and diversity of macroinvertebrates than those constructed with high-density plastic materials. The treatment with algicide, and the presence of emergent and submerged vegetation, accounted for most of the deviance when modelling species richness by means of logistic regression.
Book Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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In this paper, weed flora associated with small-scale farming in the semi-arid Tehuacan-Cuicatlan Biosphere Reserve (Mexico) was investigated. The objectives were to describe weed floristic diversity, local uses, indigenous knowledge and farmers' management as well as weed distribution in four different crop production systems along a gradient of agricultural management intensity. In total, 161 weed species belonging to 40 families and 103 genera were found, including three endemic species of the region. Approximately, 91.9% of all weed species had one or more uses, fodder being the most important one, followed by medicinal, edible and ornamental uses. The experience and knowledge of local farmers and the biodiversity of useful weed resources associated with a large variety of local crop production systems, indicated how small-scale tropical agriculture in a developing country may be compatible with in situ conservation of useful non-crop resources.
Book Description
This digital document is a journal article from Journal of Arid Environments, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
We studied the habitat preferences of Eurasian scops-owls in a semi-arid Mediterranean region undergoing large-scale habitat alteration. Generalized linear models were used to examine patterns of habitat preference at three different spatial scales: core area, home range and landscape, comparing the habitat composition around occupied and unoccupied territories. At the core area scale, owls occupied dry land tree plantations, ephemeral rivers (ramblas) and riverine forests. At the home range and landscape scales, they preferred dry land tree plantations and ramblas, the model stressing the importance of the borders between them. The length of paved roads and the presence of conspecific neighbours were also significant variables in the landscape scale model. During the study period, the population declined by 52.4%. Territory desertion was probably prompted by the increasing use of dry land plantations, ramblas and riverine forests as building land. Environmental impact studies and assessments continue to disregard the potential of agro-landscape elements for regulating hydrological flows and for hosting fauna. The present study adds to a growing number of papers revealing the importance of traditional agro-landscapes in southeastern Spain, despite whose findings, no long-term, spatially explicit measures have been proposed by environmental authorities.
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Detecting the Past (Through the Microscope Series)
Mike Corbishley
Manufacturer: Gloucester
ProductGroup: Book
Binding: School & Library Binding
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ASIN: 053117249X |
Customer Reviews:
A disappointment.......2005-11-10
This book shows what things look like through a microscope. It was disappointing to me, however, in the way this information was presented. Instead of showing a photo of the item "life size", and then one of it under magnification, so that the reader could grasp the difference, onlyl the magnified versions are shown.
And I've found an error. On page 15, in the caption for coral rings, it stays "Corals from 400 million years ago prove that the Earth had longer days then."
In actual fact, coral rings prove that days were actually SHORTER in ancient times (by about 4 hours) ...and of course the rate of the Earth's revolutions continue to slow.
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Radio Resource Management for Wireless Networks (with CD-ROM)
Jens Zander ,
Seong-Lyun Kim ,
Magnus Almgren , and
Olav Queseth
Manufacturer: Artech House Publishers
ProductGroup: Book
Binding: Hardcover
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ASIN: 1580531466 |
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Resource, Mobility, and Security Management in Wireless Networks and Mobile Communications
Manufacturer: AUERBACH
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Binding: Hardcover
Wireless Networks
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ASIN: 0849380367 |
Book Description
Organized into three parts, Resource, Mobility, and Security Management in Wireless Networks and Mobile Communications examines the inherent constraint of limited bandwidth and unreliable time-varying physical link in the wireless system, discusses the demand to realize the service continuity in the single-hop or multi-hop wireless networks, and explores trusted communication in mobile computing scenarios. Focusing on the background, technique survey, protocol design, and analytical methods, the book discusses standards in 802.11x/3G/4G, HotSpot Wireless, Bluetooth sensor networks, and access control in wireless Ad Hoc networks. Other topics include call admission control (CAC), routing, multicast, medium access control (MAC), scheduling, bandwidth adaptation, handoff management, location management, network mobility, secure routing, key management, authentication, security, privacy, and performance simulation and analysis. This book is a comprehensive source of information on basic concepts, major issues, design approaches, future research directions, and the interaction between these components. With its broad coverage allowing for easy cross reference, the book also provides detailed techniques for eliminating bandwidth insufficiency, increasing location management performance, and decreasing the associated authentication traffic. Features: · Offers competitive, self-contained information on resource, mobility, and security management in wireless networks · Explains the interaction and coupling among the most important components in wireless networks · Examines background, applications, and standard protocols · Addresses challenges and solutions in key management of wireless sensor networks · Covers how to provide effective and efficient authentication and key agreements for cellular access security
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Radio Resource Management in Cellular Systems (The Kluwer International Series in Engineering and Computer Science, Volume 618) (The Springer International Series in Engineering and Computer Science)
Nishith D. Tripathi ,
Jeffrey H. Reed , and
Hugh F. VanLandingham
Manufacturer: Springer
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Binding: Hardcover
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ASIN: 079237374X |
Book Description
Radio Resource Management in Cellular Systems is the first book to address the critical issue of radio resource management in emerging (i.e., third generation and beyond) wireless systems. This book presents novel approaches for the design of high performance handoff algorithms that exploit attractive features of several existing algorithms, provide adaptation to dynamic cellular environment, and allow systematic tradeoffs among different system characteristics. Efficient handoff algorithms cost-effectively enhance the capacity and quality of service (QoS) of cellular systems. A comprehensive foundation of handoff and related issues of cellular communications is given.
Tutorial-type material on the general features of 3G and 3.5G wireless systems (including CDMA2000, UMTS, and 1xEV-DO) is provided. Key elements for the development of simulators to study handoff and overall RF performance of the integrated voice and data cellular systems (including those based on CDMA) are also described.
Finally, the powerful design tools of neural networks and fuzzy logic are applied to wireless communications, so that the generic algorithm approaches proposed in the book can be applied to many other design and development areas. The simulation models described in the book represent a single source that provides information for the performance evaluation of systems from handoff and resource management perspectives.
Radio Resource Management in Cellular Systems will prove a valuable resource for system designers and practicing engineers working on design and development of third generation (and beyond) wireless systems. It may also be used as a text for advanced-level courses in wireless communications and neural networks.
Book Description
This digital document is an article from Fleet Equipment, published by Maple Communications on April 1, 2003. The length of the article is 676 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
Citation Details
Title: What's new? GPS-enabled phones for mobile resource management, that's what's new! (On Technology).(At Road Inc. introduces GeoManager Pocket Edition, global positioning satellite-enabled mobile phone)
Author: Carol Birkland
Publication:
Fleet Equipment (Magazine/Journal)
Date: April 1, 2003
Publisher: Maple Communications
Volume: 29
Issue: 4
Page: 6(1)
Distributed by Thomson Gale
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Lifetime Employment: A Novel
Floyd Kemske
Manufacturer: Catbird Press
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Binding: Hardcover
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Books:
- An Introduction to Underwater Acoustics
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- AP Biology Flash Cards
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- Big Home, Big Challenge: Design Solutions for Larger Spaces
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- Biogeography and Ecology of Turkmenistan (Monographiae Biologicae)
- Biology, Take Note!: Understanding Life
- Biology: Today and Tomorrow with Physiology (with ThomsonNOW?-How Do I Prepare/vMentor?, InfoTrac® 1-Semester, iLrn? Printed Access Card)
- Biotechnology in Agriculture and Forestry 36: Somaclonal Variation in Crop Improvement II (Research Reports Esprit)
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![Biodiversity of ligneous species in semi-arid to arid zones of southwestern Niger according to anthropogenic and natural factors [An article from: Agriculture, Ecosystems and Environment]](http://ec1.images-amazon.com/images/I/21PEA4S0N2L.jpg)
![Irrigation pools as macroinvertebrate habitat in a semi-arid agricultural landscape (SE Spain) [An article from: Journal of Arid Environments]](http://ec1.images-amazon.com/images/I/21DJRFXNFBL.jpg)