نتایج جستجو برای: semiarid zones

تعداد نتایج: 50355  

2002
S. NIYOGI YONGKANG XUE SETHU RAMAN

A statistical–dynamical study was performed on the role of hydrometeorological interactions in the midlatitudes and the semiarid Tropics. For this, observations from two field experiments, the First International Satellite Land Surface Climatology Project Field Experiment (FIFE) and the Hydrological Atmospheric Pilot Experiment (HAPEX)–Sahel, representative of the midlatitudes and the semiarid ...

Journal: :Journal of environmental quality 2008
Joseph L Domagalski Scott Ator Richard Coupe Kathleen McCarthy David Lampe Mark Sandstrom Nancy Baker

Agricultural chemical transport to surface water and the linkage to other hydrological compartments, principally ground water, was investigated at five watersheds in semiarid to humid climatic settings. Chemical transport was affected by storm water runoff, soil drainage, irrigation, and how streams were linked to shallow ground water systems. Irrigation practices and timing of chemical use gre...

2000
M. M. Ahmed

In spite of substantial introduction of new sorghum and millet cultivars in semiarid SubSaharan Africa, there has been minimum aggregate impact on yields (FAO and ICRISAT, 1996: The World Sorghum Economies: Facts, Trends and Outlook. FAO, Rome, Italy and ICRISAT, Andhra Pradesh, India) in contrast with other crops, such as cotton and maize. Only where inorganic fertilizers and improved water re...

Journal: :Applied sciences 2021

Land use change can impact the land surface radiation budget and energy balance by changing biophysical processes. Based on satellite remote sensing data from 2000 to 2015, we quantitatively estimated radiative forcing induced cropland expansion during early 21st century in northern China. The results showed that heat flux atmosphere due was quite variable different climate zones. increased hum...

Journal: :ISPRS Int. J. Geo-Information 2017
David M. Makori Ayuka T. Fombong Elfatih M. Abdel-Rahman Kiatoko Nkoba Juliette Ongus Janet Irungu Gladys Mosomtai Sospeter Makau Onisimo Mutanga John Odindi Suresh K. Raina Tobias Landmann

Bee keeping is indispensable to global food production. It is an alternate income source, especially in rural underdeveloped African settlements, and an important forest conservation incentive. However, dwindling honeybee colonies around the world are attributed to pests and diseases whose spatial distribution and influences are not well established. In this study, we used remotely sensed data ...

2014
Sara Palacio Melchor Maestro Gabriel Montserrat-Martí

Nitrogen (N) is, after water, the most limiting resource in semiarid ecosystems. However, knowledge on the N cycling ability of semiarid woody plants is still very rudimentary. This study analyzed the seasonal change in the N concentrations and pools of the leaves and woody organs of two species of semiarid sub-shrubs with contrasting leaf habit. The ability of both species to uptake, remobiliz...

2014
Hongrui Ren Guangsheng Zhou

Accurate estimation of green aboveground biomass in arid and semiarid grassland is essential for a variety of studies, such as sustainable grassland management, fire risk assessment, climate change, and environmental degradation. A great need exists for the establishment of robust method for estimating green aboveground biomass in arid and semiarid grassland due to the influences of soil backgr...

Journal: :Remote Sensing 2015
Fei Feng Jiquan Chen Xianglan Li Yunjun Yao Shunlin Liang Meng Liu Nannan Zhang Yang Guo Jian Yu Minmin Sun

Accurate estimation of latent heat flux (LE) is critical in characterizing semiarid ecosystems. Many LE algorithms have been developed during the past few decades. However, the algorithms have not been directly compared, particularly over global semiarid ecosystems. In this paper, we evaluated the performance of five LE models over semiarid ecosystems such as grassland, shrub, and savanna using...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید