Normalized Difference Vegetation Index (NDVI) is a widely used indicator of vegetation status. In this
study, Moderate Resolution Imaging Spectroradiometer (MODIS) data was used to calculate NDVI,
and then the data from NDVI combined with ground sampling are used to conduct the soil organic
carbon (SOC) and nitrogen (N) research, which analyze the SOC and N contents in the surface soil of
Huolin River Wetland in northeast China. The results show that NDVI, SOC and N are highly related,
and NDVI can be used to study C and N spatial distribution in this wetland. It also demonstrates that
herbaceous vegetation is a better indicator of wetland nutrient enrichment.
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.
AHP is a kind of very effective systematic analytical method, widely applied to energy utilizing and resource analyzing, talent predicting, economic management project, urban industries planning, communications and transportation, water resource using and so on, using this method to solve the problem of ecology also have very strong practicability and validity. Using 15 kinds of endured plants in East Alashan-West Erdos as the research objects, this paper adopts 3S technique and outfield investigates to confirm the geographical distributions, extent density in the distribution area, plant community construction, and plant community environment of the plants. Then invite the experts to give marks according to this datum and using the AHP method to deal with the results, thereby get the priority protective order of endangered plants in East Alashan-West Erdos.
Fuel moisture content (FMC) is an important parameter in determining fire risk and fire behavior. Direct measurement of FMC in the field is very costly and time consuming. Therefore, remote sensing becomes the effective method to retrieve FMC at large scale. Short wave infrared (SWIR) band reflectance has been found negatively related to leaf water content and most of the researches are conducted at leaf level. Here SWIR and NIR (Near Infrared) bands of Moderate Resolution Imaging Spectroradiometer (MODIS) are used to retrieve FMC at canopy level in Northeast China forest. The result shows that the combination of MODIS band 7 and 2 presented the best results for FMC estimates. It is also found that forest fires prone to spread along the dryer area.
Longdong region is known as one of the most serious soil erosion areas in the Loess Plateau of China. In this paper, Modified Soil Adjustment Vegetation Index (MSAVI) calculated from the shared Terra/MODIS data. Slope is derived from GTOPO-DEM data provided by the US Geological Survey (USGS). Soil Erosion Intensity of Longdong loess plateau region is calculated with the following three factors MSAVI, slope and average annual rainfall. Compared with previous soil erosion result produced in 1991, the two results match quite well, which shows that the remote sensing data of MODIS is applicable in rapid assessment of regional soil erosion.
The paper calculated an ecological footprint of Wusu city in 1990, 1996 and 2003, and analyzed the current status of sustainable development and dynamic change. Results show that the per capita ecological footprint of Wusu is constantly increasing, but the per capita ecological carrying capacity is decreasing. The per capita ecological footprint in this region varied from surplus, deficit to deteriorating in thirteen years. In addition, diversification of ecological footprint in Wusu city, potential of ecological economy system and efficiency in resource utilizing were steadily improved. It can be concluded that ecological economy system in Wusu city is a unsustainable one.
We studied changes in the oasis-desert ecosystems of Akesu Oasis in Xingjiang, China. We used the ‘frontier theory’ of landscape ecology to analyze changes from 1990 to 2000. The results show that considerable landscape changes occurred during that time as a result of changes in both natural and social-economic factors. However, the influence of socioeconomic factors predominated.
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