Urban greenbelt plays a positive role in improving the ecology and harmonious interacting between human being and
nature, especially in tourism city. Dynamic monitoring of urban greenbelt is very important to effective manage the city
and construct the city. This study provides the scientific basis to analysis the change of city. This paper uses the ETM
and SPOT image in 2003, 2007 and TM image in 1993 of the whole city of Hangzhou to calculate the urban greenbelt
change. The result shows that, in the past ten years, because of the ceaseless development of Hangzhou and its intensive
exploitation, the city has reduce a lot of greenbelt, and the spatial distribution do not meet the need of development of
tourism city. So the greenbelt can not produce their ecological function effectively in ecological tourism city.
Monitoring the Greenbelt Dynamic based on remote sensing is useful way to solve the problem in managing the city.
Based on the land use data interpreted from TM and ASTER images of Hangzhou Xixi Wetland in 1991, 2001 and 2005,
in this paper, we first study the spatiotemporal diversity of urban growth and the evolution of urban landscape pattern in
Hangzhou Xixi wetland during the rapid urbanization by calculating the indexes of landscape pattern such as Fractal
Dimension, Peri-Area Ratio, Fragmentation, Shannon-diversity. The results showed that (1) the spatial landscapes from
class level and landscape level have evident differences, (2) from class level, the changes of the main landscape in
Southeast area were very complicate, and wetland and forest in Core area have the bigger Fractal Dimension and small
Fragmentation, (3)from Landscape level, the Fragmentation and Shannon-diversity were bigger and the Dominance and
Contagion have decreased, (4)the landscape in different times has different changes from wetland dynamic
change,(5)during the process from the urban edge wetland to urban wetland, the landscape pattern change of Xixi urban
wetland have evident differences because of the human influence.
Wetland park ecosystems of Yangtze River Delta are located in highly populated areas and subject to high levels of
contamination. Monitoring of wetlands to assess degrees of pollution damage requires periodic retrieval of information
over large areas, which can be effectively accomplished by remote sensing technologies. The biophysical principles of
remote sensing of vegetation under stress need to be understood in order to correctly interpret the information obtained at
the scale of canopies.
To determine the potential to remotely characterize and monitor pollution, plants of Bulrush, a major component of
wetland park communities in Yangtze River Delta, were treated with two metals to study their sensitivity to pollutants
and how this impacted their reflectance characteristics. Several growth and physiological parameters, as well as their
reflectance were measured. Significant differences between treatments were found in at least some of the measured
parameters in pollutants. Reflectance was sensitive to early stress levels only for cadmium. Pollutants that differ in their
way of action also had different plant reflectance signatures. The high degree of correlation between spectral reflectance
and plant stress by heavy metal contamination showed the potential of using remote sensing to assess the type and degree
of pollution damage.
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