نتایج جستجو برای: ecosystem
تعداد نتایج: 83322 فیلتر نتایج به سال:
this study aims to quantify the impacts of land use changes on ecosystem service value during large scale land development, and to provide key information for both economic development and policy makers for eco-environmental protection. the study area locates in manas river watershed which is a typical land development region in northwest china. landsat mss/tm/etm+ images in 1976, 1989, 1999 a...
this study aims to quantify the impacts of land use changes on ecosystem service value during large scale land development, and to provide key information for both economic development and policy makers for eco-environmental protection. the study area locates in manas river watershed which is a typical land development region in northwest china. landsat mss/tm/etm+ images in 1976, 1989, 1999 an...
E service is the collective name for the benefits that people obtain from ecosystems. As a scientific concept, it can be dated back to the 1960s; whereas, the proliferation of ecosystem service research has been since the late 1990s driving by the increasing environmental concerns of human societies. Ecosystem service has been defined from an anthropocentric perspective that links ecosystems an...
The Millennium Ecosystem Assessment (MA) scenarios address changes in ecosystem services and their implications for human well-being. Ecological changes pose special challenges for longterm thinking, because of the possibility of regime shifts that occur rapidly yet alter the availability of ecosystem services for generations. Moreover, ecological feedbacks can intensify human modification of e...
A Flexible Authentication and Authorisation Mechanism for Securing Transactions in Digital Ecosystem
This paper firstly introduces the newly emerged collaborative technology termed as Digital Ecosystem. The concept of Digital Ecosystem and the existing research in this area are discussed in detail. Next, the paper outlines several issues that need to be solved for a successful implementation of Digital Ecosystem environment. As the main focus of this paper is in the security area, we have iden...
Since the Millennium Ecosystem Assessment, ecosystem service science has made much progress in framing core concepts and approaches, but there is still debate around the notion of cultural services, and a growing consensus that ecosystem use and ecosystem service use should be clearly differentiated. Part of the debate resides in the fact that the most significant sources of conflict around nat...
Population sizes and growth rates are two major factors used by ecologists in assessing human impacts on ecosystems and landscapes. However, the numbers of households have been increasing much faster than population sizes. As households are basic socioeconomic units (e.g., in consumption of ecosystem services) and key components of coupled human and natural systems, household proliferation has ...
The concept of ecosystem services--the benefits that nature provides to human's society--has gained increasing attention over the past decade. Increasing global abiotic and biotic change, including species invasions, is threatening the secure delivery of these ecosystem services. Efficient evaluation methods of ecosystem services are urgently needed to improve our ability to determine managemen...
Effective ecosystem risk assessment relies on a conceptual understanding of ecosystem dynamics and the synthesis of multiple lines of evidence. Risk assessment protocols and ecosystem models integrate limited observational data with threat scenarios, making them valuable tools for monitoring ecosystem status and diagnosing key mechanisms of decline to be addressed by management. We applied the ...
Purpose: The purpose of this paper was to validate a model for using the entrepreneurial ecosystem in e-banking. Method: This study was a cross-sectional survey in terms of method and time of data collection. The statistical population included managers and experts of the country's electronic banking system. The sample size was 384 people and sampling was done by simple random method. Structur...
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