Results 251 to 260 of about 13,592 (303)

On carbon sequestration in desert ecosystems

Global Change Biology, 2009
AbstractRecent reports of net ecosysytem production >100 gCm−2 yr−1 in deserts are incompatible with existing measurements of net primary production and carbon pools in deserts. The comparisions suggest that gas exchange measurements should be used with caution and better validation if they are expected to indicate the magnitude of carbon sink in ...
Schlesinger, William H., Belnap, Jayne, Marion, Giles   +2 more
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Bioresearches of Fragile Ecosystem/Desert

Proceedings of the National Academy of Sciences, India Section B: Biological Sciences, 2012
The proponents of anthropocene (the era of human-induced climatic changes) suggest that unless humanity changes its behavior according to earth system rules there will be no more holocene-type relative stability. Even the sustainability of the Earth’s life support systems is threatened.
Sumitra Kumari Choudhary, Deepika Lodha, Meena Vyas, Narpat S. Shekhawat, Vinod Kataria, Smita Shekhawat, Ashok Kumar Patel, Nitika Singh Rathore, Mahendra Phulwaria, Harish, Manoj K. Rai, Nisha Rathore, Amit K. Gupta, Rachana Modi, J. B. Vibha   +14 more
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Mercury Deposition in a Polar Desert Ecosystem

Environmental Science & Technology, 2008
Trace metals have received considerable attention in the recent decades due to their potential toxic nature. Glacial snow and ice have been used extensively to elucidate historical changes in the atmospheric composition of trace metals and other compounds.
W. Berry Lyons, Rebecca A. Witherow
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Decomposition of roots in a Chihuahuan Desert ecosystem

Oecologia, 1988
Mass losses of tethered buried roots of two woody shrubs and two herbaceous annuals buried in plots irrigated at 25 mm·month-1, 6 mm·week-1 and no irrigation were measured. At the end of 1 year, 10-15% of the mass of the herbaceous annual roots remained and 60% of the mass of woody shrub roots remained.
K. Stinnett, John P. Anderson, Walter G. Whitford   +2 more
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Characteristics of Arid and Desert Ecosystems

2017
An ecosystem is simply defined as organisms and their environment. The term “ecosystem” implies an integral link between organisms and their non-living environment with interactions that mean they cannot live outside the specific environment.
Majid Ghorbani, Mohammad Jafari, Fatemeh Panahi, Ehsan Zandi Esfahan, Ali Tavili   +4 more
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Underestimation of soil respiration in a desert ecosystem

CATENA, 2018
Abstract Soil respiration (Rs), conventionally considered as net soil CO2 flux, is an important link in the terrestrial carbon cycle. However, existing estimates of Rs in drylands may be erroneous, because of the abiotic soil CO2 flux. This may seriously hamper our understanding of the carbon cycle of desert ecosystems.
Keyu Fa, Yuqing Zhang, Guangchun Lei, Bin Wu, Shugao Qin, Jiabin Liu, Wei Feng, Zongrui Lai   +7 more
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Teaching the Concept of Desert Ecosystem

European Journal of Science Education, 1979
Summaries English In order to test the possibilities of the desert as an educational resource for ecosystem study a development programme was started at the Institute for Desert Research in Israel in 1972. The objectives of the investigation were: (1) To study the structure and function of a loessial plain and rocky hill‐top ecosystem in the Negev ...
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Impact of agrodesert on a desert ecosystem

Journal of Arid Environments, 1988
The desert ecosystem has characteristically low biological activity and a low diversity of flora and fauna. In this harsh evironment living organisms maintain a fragile homeostatic existence and in consequence, desert ecosystems are endowed with an inherently delicate ecological balance.
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Nitrogen fixation in a desert stream ecosystem

Biogeochemistry, 1997
Few measurements of nitrogen fixation exist for streams. Desertstreams are warm, well lighted, and often supportabundant cyanobacterial populations; thus N2 fixationmay be significant in these N-poor ecosystems. N2fixation was measured in situ by acetylene reductionfor two patch types (Anabaena mat and anepilithic assemblage). Patch-specific rates were
Kevin C. Petrone, Nancy B. Grimm
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The Application of CNOP in the Management of the Desert Ecosystem

Advanced Materials Research, 2012
The formation of vegetation patterns in the semi-arid climatic zones is established in the Shnerb’s dynamic model. In this paper, the sensitivity and nonlinear instability of the grassland ecosystem to finite-amplitude initial perturbations and parameter perturbations were studied. A useful approach of conditional nonlinear optimal perturbations (CNOPs)
Bo Wang, Xiao Hong Cai, Shang Wu
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