Landscape change and its eco-environmental effects have becoming one of the hottest issues of research on global environmental changes. In this paper, Tarim Populus Nature Reserve, located in the middle stream of Tarim River and eco-environment is fragile with relatively strong human activities, high evaporation and low rainfall, was selected as the target area, and applied remote sensing technology and geographic information systems (GIS) to obtain the basic data for landscape patterns change of the study area in 1973-1992 and 2001. Based on 3S technology and monitored data from field investigation, the characteristics of landscape patterns change, the drivers and its effects on the eco-environment of Tarim Populus Nature Reserve in recent 30 years were analyzed. According to the landscape transition matrix, the degree of land use change in the two different periods (1973-1992, 1992-2001) was analyzed, and a scientific basis for the eco-environment protection of Tarim Populus Nature Reserve was provided.
There are many means to monitor the Land Use and Land Cover Change (LUCC) in time. Phase difference Image, is
one of these means that is often used. By using gaps images to analyze the changes, errors in result images happen
easily by accident. Another disadvantage of Phase difference Image is not adequately using the time-serial images. The
pixel at the same position in time-serial images will structure a sequence change of points, this sequence include
information of LUCC, and it is important to describe the change process of those points for understanding the change of
Land Cover. In this paper, we use Fractional Vegetation Cover (FVC) images that were derived from NOAA/AVHRR
time series data from 1982 to 2000 and time (year) is the independent variable. Every pixel is an attributive variable,
using the regress method to analyze the change of vegetaion cover in Westen China. Meanwhile, we discuss the results
and significance of the F-test and t-test for this regression. Through the above work: 1) the result of the regression
method for time series data is more stabilizing than Phase Difference Image; 2) Regression method can be used to
forecast the change of vegetation and Phase difference image can not; 3) By the regression image, we can find that the
increase of vegetation cover is close relationship with old oasis, and that human activities is obviously one of the most
important factors contributing to the change of vegetation cover in the arid lands in Westen China. In Qaidam High
Basin, there are few signs of human habitation, the vegetation cover decreased, indicating the environment has degraded
in this area.
Populus euphratica (P. euphratica), at Tarim Nature Reserve, growing in their natural habitat represents a valuable resource for elucidating mechanism of acclimation to environmental constraints. P. euphratica is a salt-tolerant tree species growing in saline semi-arid areas. It is one of the stress-tolerance and desert-grown species. Therefore, the P. euphratica has been treated as main protecting object and the Tarim Nature Reserve is one of two P. euphratica Reserves in China. The nature reserve is located in the middle reach of the Tarim River, Xinjiang. It is not only the world's largest intact and unfrequented area of Populus euphratica forests, but also plays great significant role in maintaining the ecological balance of the Tarim Basin. However, the Populus euphratica Nature Reserve's eco-environment is getting more and more degenerated due to the human activities in recent years. This paper analyzed the ecological frangible factors and their influence mechanisms on the nature reserve eco-system stability using 3S technologies. The results showed the eco-environmental condition of P. euphratica is fragile and the ability of insisting on the artificial influence is weak because of the harsh climate, topographical conditions, and human irrational water use and land resources. The shortage and exhaustion of surface water, as well as descending of groundwater depth, make Populus euphratica forests deteriorating. The protecting strategies are suggested in this paper according to the research analyses.
Qira Oasis lies in the southern region of the Tarim Basin, and on the northern slope of the Kunlun Mountains. It is one of the areas which show the obvious evolution of an ecological environment, and has been intruded upon by human activities in the last 50 years, so it has became a target area for researching, exploiting, and utilizing water resources in the oasis. Based on groundwater formation in the Qira Oasis, this paper will study the prosess of yearly and seasonal groundwater variation and analyze the relationship between groundwater variation and the eco-environment of the surface.
Conference Committee Involvement (3)
Remote Sensing and Modeling of Ecosystems for Sustainability IV
28 August 2007 | San Diego, California, United States
Remote Sensing and Modeling of Ecosystems for Sustainability III
14 August 2006 | San Diego, California, United States
Ecosystems Dynamics, Ecosystem-Society Interactions, and Remote Sensing Applications for Semi-Arid and Arid Land
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