نتایج جستجو برای: semi arid areas

تعداد نتایج: 542261  

Journal: :Remote Sensing 2016
Manuela Domínguez-Beisiegel Carmen Castañeda Bernard Mougenot Juan Herrero

Inland saline wetlands are complex systems undergoing continuous changes in moisture and salinity and are especially vulnerable to human pressures. Remote sensing is helpful to identify vegetation change in semi-arid wetlands and to assess wetland degradation. Remote sensing-based monitoring requires identification of the spectral characteristics of soils and vegetation and their correspondence...

Journal: :The Onderstepoort journal of veterinary research 2004
M W Maichomo J M Kagira T Walker

Helminths cause great economic loss in livestock in Africa, and can be categorized as either direct or indirect losses. Arid and semi-arid lands (ASAL) in Kenya comprise 71% of total land area and harbour the largest population of cattle, sheep and goats. However, little information on the distribution and impact of gastro-intestinal (GIT) parasitism in these animals is available. This survey w...

Journal: :مرتع و آبخیزداری 0
فریدون سرمدیان استادیار گروه علوم و مهندسی خاک، دانشکده مهندسی و فناوری کشاورزی، دانشگاه تهران علی کشاورزی استاد گروه علوم و مهندسی خاک، دانشکده مهندسی و فناوری کشاورزی، دانشگاه تهران

data mining enables generalization of data of soil to remote areas and which is able to up/down scale of data in wide ranges of level that facilitate the decision-making process of executives. cation exchange capacity (cec) is one of the most important parameters in soil database and shows the ability of a soil to retention of minerals and pollutants. due to low organic matter and specific mine...

1997
K. N. Arora

Because of climatic constraints, agriculture in temperate areas of India is mostly limited to a single grain crop. During winters vegetable or oilseed crops may be cultivated at the lower altitudes but the higher altitudes remain barren due to snow cover. Horticulture, another important pursuit of farmers is again limited to summers. In order to supplement their income, the farmers in these are...

2011
Daniel Kuester

The economic activity in arid/semiarid areas of the western United States would seem to be much more influenced by weather than humid/semi humid areas since they are located marginally closer to major drought conditions at any moment in time. This paper reexamines the original “sunspot” theory of business cycles of William Stanley Jevons, the contributions of his son H. S. Jevons, and the furth...

2012
Rong-Ping Li Guang-Sheng Zhou

Plant phenology models, especially leafing models, play critical roles in evaluating the impact of climate change on the primary production of temperate plants. Existing models based on temperature alone could not accurately simulate plant leafing in arid and semi-arid regions. The objective of the present study was to test the suitability of the existing temperature-based leafing models in ari...

Journal: :Remote Sensing 2022

The Moderate Resolution Imaging Spectroradiometer (MODIS) Deep Blue (DB) algorithm was developed for aerosol retrieval on bright surfaces. Although the global validation accuracy of DB product is satisfactory, there are still some regions found to have very low accuracy. To this end, has updated surface database in latest version Collection 6.1 (C6.1) algorithm. Some studies shown that optical ...

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