Zhou Kefa

Ecological response to the climate change on the northern slope of the Tianshan Mountains in Xinjiang

The Tianshan Mountains is a high and huge mountain body lying across the central part of Xinjiang, China, and is also the main area where the runoff forms in Xinjiang. In this paper, a set of RS-based study methods is put forward for deriving the information about the natural change of the ecology in arid areas, and the relationship between the climate change trend and the corresponding ecological response on the northern slope of the Tianshan Mountains since recent 40 years is analyzed from the scales of the land cover ecosystems and landscapes based on the observed data of climate, hydrology, modern glaciers and lakes on the northern slopes of the Tianshan Mountains since recent 40 years and the satellite RS data since recent 10 years by using the RS and GIS technologies. The results are as follows: (1) The overall trend of climate change on the northern slope of the Tianshan Mountains since recent 40 years is that both air temperature and precipitation are increased, especially the increase amplitudes of air temperature, precipitation and annual runoff volume are high since the decade of the 1990s; (2) the integrated indexes of the vegetation in all the geographical divisions on the northern slope of the Tianshan Mountains are obviously increased since recent 10 years, especially in the artificial oases and the foothill belts, such a change trend is advantageous for improving the vegetation ecology; and (3) the vegetation ecology in the arid areas is extremely sensitive to the climate change, the vegetation coverage and the biomass on the northern slope of the Tianshan Mountains are continuously increased because of the climate change since recent 10 years, their increase amplitudes in the plains and during the late stage are obviously higher than that in the mountainous regions and during the early stage.

Corridor effect of the spatial changes of landscape patterns in arid areas: A case study of the river corridor areas in the middle and lower reaches of Tarim River

The river corridor areas in the middle and lower reaches of the Tarim River are dominated by the traditional green corridors along the river section from the Qara Reservoir in Yuli County to the Taitema Lake in Ruoqiang County, which plays an important role in the social and economic development in the Tarim River Watershed with a extremely significant ecological functions. The buffer zones perpendicular to the watercourse were defined along both riversides at a 5-km interval beginning from the watercourse (10 km wider) using the method of the buffer zone analysis. The landscape pattern indexes of each buffer zone were calculated, and the indexes of the main landscape patterns were analyzed so as to reveal the radiative effect and the characteristics of the river corridors on landscape and patch levels. The results show that the radiative width is generally 30 km in the study area, and can be up to 50–70 km in sub-region FG1 because the study area is located in two drainage basins, with an ecological interstitial zone between them. The landscapes of woodlands and wetlands are generally distributed within the 10 km buffer zone (it means that the buffer zone is 5 km away from the watercourse; the same hereafter) along both riversides. Moreover, the closer the buffer zone is to the watercourse, the higher the patch density and the largest patch index are. In the ecological and environmental regeneration for the study area, the extent of ecological effect of the river corridors must be fully considered, and the projects must be scientifically and rationally planned and designed.

Study on RS- and GIS-based ecological capital assessment in arid areas

Ecological capital assessment is currently one of the important research contents in the interdisciplinary field of ecology, resources economics, environmental economics and ecological economics. To scientifically assess ecological capital redounds to decision-makers to consider the ecological cost in economic development, and is also necessary for sustainable economic development in arid areas. Based on the theory of landscape ecology, in this paper the per unit area ecological capital values in arid areas are researched by using the Landsat TM data, CBERS satellite data, meteorological data, MODIS satellite data and other ecological data, and the RS-and GIS-based models of assessing ecological capital values in arid areas are developed. Moreover, based on the field-measured data, a case study on ecological capital assessment in the Manas River basin, Xinjiang in 2003 is carried out. The basin is divided into 4 ecological capital areas so as to quantitatively calculate the ecological capital values of the ecosystems, analyze the spatial distribution of ecological capital, and chart the maps of spatial distribution of ecological capital. The results show that the total ecological capital value of the ecosystems in the Manas River basin in 2003 was 1.494 54×1011 yuan RMB. In spatial distribution, the ecological capital decreases from the alpine zones to the plains and from the oases to the deserts, which accords with the distribution of vegetation zonality in this arid area. The assessed results can objectively reflect the ecological capital and its spatial distribution in the arid basin, and can also provide reference for roundly carrying out the assessment of ecological capital in arid areas.

Parallel Research of Sequential Pattern Data Mining Algorithm

Sequential pattern has important applications in many areas and a large number of data and patterns need efficient and scalable parallel algorithm. In light of the widespread problem in current sequential pattern data mining algorithm and on the basis of researching the data mining algorithm of serial sequential pattern, a data mining algorithm of parallel sequential pattern is presented in this paper. Through theoretical analysis and experimental verification, the parallel data mining algorithm can well improve the efficiency of data mining in massive data circumstances.

Quantitative assessment and analysis on the dynamic change of ecological capital in arid areas

Ecological capital is the summation of the direct value of biological resources and the ecological service function value of ecosystems. Under the support of RS, GPS and GIS, in this paper the RS-based quantitative measurement model of assessing ecological capital is developed based on the traditional ecology theory and the research on the value of ecological capital per unit area by using the ecological parameters including Landsat TM data, CBERS satellite data, meteorological data, MODIS satellite data, land cover data and field-measured data. A case study on the spatiotemporal distribution of ecological capital in Changji Hui Autonomous Prefecture in 1990, 1995 and 2003 is carried out, and the dynamic change of ecological capital in the prefecture is measured and compared with GDP. The maps of the spatial distribution of ecological capital in the study area are charted, and the characteristics of spatial distribution of ecological capital are analyzed. The results show that the values of ecological capital in the prefecture in 1990, 1995 and 2003 were 1.473 68×1011, 1.661 60×1011 and 1.778 95×1011 yuan RMB (hereafter referred to as yuan) respectively, and that in spatial distribution, the ecological capital decreases from the alpine zones to the plains and from the oases to the deserts, which accords with the zonal distribution of vegetation in arid areas. The measured results can more objectively reflect the ecological capital and its spatial distribution in arid areas, provide an ideal foundation for further study in the future, and can also be combined with the study on service functions of ecosystems and the regional planning as an important basis of regional planning.

Analyzing Land Cover Changes Influenced by Topographic Factors Based on Technologies of RS and GIS – A Case Study of Yuli County of Xinjiang

In order to predict the spatial distribution of land cover of different topographic factors, a quantitative research on the effects of elevation and slope factors on the process of land cover change during 1980-2007 were conducted using RS(remote sensing) and GIS(geographic information system) technology. Yuli county in Xinjiang is chose as the research area, two periods of MSS/TM remote sensing images in 1980 and 2007 and 1:50000 topographic map were taken as main data sources. The results showed that: during the past three decades: the area of cropland, forest-grass land, water, and construction land changed prominently, cropland mainly was converted into forest-grass land, water mainly converted into the forest-grass land; construction land expanded into the extent of high elevation; cropland and the construction land were distributed consistently on gradient, change trends of both land covers were identical, and expanded into the region of steeper slope; the forest-grass land with 3o; the water body kept reducing across the whole region. The changes of land use were mainly caused by topographic factors and social economy. It is feasible to predict the spatial distribution of land cover based on topographic data, remote sensing images and socioeconomic data, the results provided scientific basis for eco-environment evaluation and sustainable development in the region.

Study of recognition the remote sensing information of alteration based on MPS model

This research made use of the more accessible ETM+ remote sensing data and based on the previous methods to propose the MPS model and extract alteration information. The meaning of MPS model was mask process-principal component analysis-the support vector machine processing. This article applied and tested the methodology in the Hatu area, Xinjiang. Though the research, there was a better effect of extraction, and the outcome and the distribution of the mineral deposits was coherent well.

The Use of GPS for the Measurement of Details in Different Areas

These GPS techniques can be stated as static, kinematic, semi-kinematic and on the other hand, with respect to the special precision requirements of different applications, they can also be stated as relative, absolute and DGPS techniques. RTK GPS has seen great technological advances over the past few years and is now routinely used in a wide variety of engineering type applications. evaluate RTK performance near the forest and in an urban environment under varying site conditions, and expected problems due to signal blockage and data latency.

Ecological Capital Assessment and Analyses of Dynamic Changes in Arid Area

Form the macroscopical-ecology point of view, base on remote sensing measure of region ecological capital evaluations character, consider the possibility and reliability of acquire the data, we developed regional ecological capital assessment index in remote sensing measure. The paper calculate the total ecological capital from nine kind of ecological value. Base on the research achievements of the methodology of calculating per unit area ecological service value and the support of RS, GPS and GIS, the RS-based quantitative measurement of assessing the ecological capital developed by using the Landsat TM data, CBERS satellite data, meteorological data, MODIS satellite data and ecological data. We divided the study site to four ecological district and assess the ecological capital quantitative. A case study on the Spatial Analysis of the assessment of ecological capital in Changji Hui autonomous in 1990, 1995 and 2003 is carried out. Maps of the spatial distribution of ecological capital in the study area are charted, and the characteristics of the spatial distribution of ecological capital are analyzed.