Results 321 to 330 of about 1,012,608 (381)

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
openaire   +3 more sources

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
openaire   +2 more sources

Soil bacterial community succession during desertification in a desert steppe ecosystem

Land Degradation and Development, 2020
Desertification often occurs in fragile steppe ecosystems, which may lead to severe soil degradation. Understanding how soil microbial communities respond to desertification is critical for ecological restoration of degraded desert steppes.
Miaochun Fan, Jiajia Li, Zhuangsheng Tang, Z. Shangguan   +3 more
semanticscholar   +1 more source

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 ...
openaire   +2 more sources

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.
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +2 more sources

Drivers and regulating mechanisms of grassland and desert ecosystem services

, 2014
Examining the drivers and regulating mechanisms of multiple ecosystem services has emerged as a central issue in ecology in recent years. In this paper, we start with the definition of ecosystem services, recent progresses and research priorities in the ...
B. Yong
semanticscholar   +1 more source

Desert Ecosystems: Their Resources in Space and Time

Environmental Conservation, 1982
The dynamics of desert ecosystems control levels of resources that are essential to the survival of desert biotas. Because precipitation is both low and relatively unpredictable in arid regions, the climates, topographies, and soils, of these areas present formidable constraints to resource availability in space and time.
James R. Gosz, Clifford S. Crawford
openaire   +2 more sources

Invertebrates in Desert Ecosystems: Summary Remarks [PDF]

, 1981
Part 1 of this book established a “desert perspective” to serve as a background for the material to follow. It also introduced an underlying theme, namely the contribution of invertebrates to the structure and function of desert ecosystems. Yet up to now, this inclusive concept has been treated only indirectly in the book’s three major units ...
openaire   +1 more source