Because of the existence of gradient field of the urban center and the corridor effect. underthe drive of going merely after economic benefit, the city intrinsically has the trend of massive growth, and this will se...Because of the existence of gradient field of the urban center and the corridor effect. underthe drive of going merely after economic benefit, the city intrinsically has the trend of massive growth, and this will seriously destroy the urban reasonable landscape structure and the ecological equilibrium.By applying the theory of corridor effect. this paper studies the interactive process between artificialcorridors and natural corridors. At the same time, by studying the Beijing's spatial extension pattern in central urban area during different periods. this paper analyses the corridors extension volume.extension velocity and variant tendency of urban landscape on & directions. Moreover. this paperbrings forward the idea of incorporating the systen of natural corridors into the Beijing'smetropolitan planning, namely to form a star-shaped scattering-group pattern in which artificialcorridors and natural corridors are alternately distributed in order to effectively prevent built-up areafrom massive growth .展开更多
China＇s southwestern special terrain pattern as parallel arrangement between lon- gitudinal towering mountains and deep valleys has significant effects on the differentiation of local natural environment and eco-geog...China＇s southwestern special terrain pattern as parallel arrangement between lon- gitudinal towering mountains and deep valleys has significant effects on the differentiation of local natural environment and eco-geographical pattern in this region. The 1：50,000 Digital Elevation Model （DEM） data of Longitudinal Range-Gorge Region （LRGR）, meteorological observation data from the station establishment to 2010, hydrological observation data, Normalized Difference Vegetation Index （NDVI） and Net Primary Productivity （NPP） products of MOD13 and MOD17 as well as 1：1,000,000 vegetation type data were used. Moisture in- dices including surface atmospheric vapor content, precipitation, aridity/humidity index, sur- face runoff, and temperature indices including average temperature, annual accumulated temperature, total solar radiation were selected. Based on ANUSPLIN spline function, GIS spatial analysis, wavelet analysis and landscape pattern analysis, regional differentiation characteristics and main-control factors of hydrothermal pattern, ecosystem structure and function in this region were analyzed to reveal the effects of terrain pattern o~ regional dif- ferentiation of eco-geographical elements. The results show that： influenced by terrain pattern moisture, temperature and heat in LRGR have shown significant distribution cllaracteristics as intermittent weft differences and continuous warp extension. Longitudinal mountains and valleys not only have a north-south corridor function and diffusion effect on the transfer of major surface materials and energy, but also have east-west barrier function and blocking effect. Special topographic pattern has important influences on vegetation landscape diversity and spatiat pattern of ecosystem structure and function, which is the main-control factor on vegetation landscape diversity and spatial distribution of ecosystem. Wavelet variance analysis reflects the spatial anisotropy of environmental factors, NDVI and NPP, while wavelet consistency analysis reveals the control factors on spatial distribution of NDVI and NPP as well as the quantitative relationship with control degree. Special terrain pattern in LRGR is the major influencing factor on eco-geographical regional differentiation in this region. Under the combined effect of zonality and non-zonality laws with ＂corridor-barrier＂ functior as the main characteristic, special spatial characteristics of eco-geographical regional system in LRGR is formed.展开更多
Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were re...Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were revealed. Moreover,the ecological effect of wind power development on the reduction of local sandstorm and sand flow was estimated. The results show that if the maximum rotor power coefficient of a wind-driven generator is 0. 5,the forward movement speed of sand body( or desert)( 8 827 km × 1 m × 1 m) will reduce by 1 m every year through the development and conversion of wind energy resources in Hexi Corridor. If the proportion of exploitable wind energy resources is 50%,the forward movement speed of sand body( or desert)( 4 414 km × 1 m × 1 m) will decrease by 1 m every year. It is clearly seen that wind power industry has obvious effects on the control of sandstorm and sand flow. Wind energy resources in Hexi Corridor have great development potential,and wind power industry can bring both ecological and economic benefit to people.展开更多
文摘Because of the existence of gradient field of the urban center and the corridor effect. underthe drive of going merely after economic benefit, the city intrinsically has the trend of massive growth, and this will seriously destroy the urban reasonable landscape structure and the ecological equilibrium.By applying the theory of corridor effect. this paper studies the interactive process between artificialcorridors and natural corridors. At the same time, by studying the Beijing's spatial extension pattern in central urban area during different periods. this paper analyses the corridors extension volume.extension velocity and variant tendency of urban landscape on & directions. Moreover. this paperbrings forward the idea of incorporating the systen of natural corridors into the Beijing'smetropolitan planning, namely to form a star-shaped scattering-group pattern in which artificialcorridors and natural corridors are alternately distributed in order to effectively prevent built-up areafrom massive growth .
基金National Basic Research Program of China,No.2003CB415101
文摘China＇s southwestern special terrain pattern as parallel arrangement between lon- gitudinal towering mountains and deep valleys has significant effects on the differentiation of local natural environment and eco-geographical pattern in this region. The 1：50,000 Digital Elevation Model （DEM） data of Longitudinal Range-Gorge Region （LRGR）, meteorological observation data from the station establishment to 2010, hydrological observation data, Normalized Difference Vegetation Index （NDVI） and Net Primary Productivity （NPP） products of MOD13 and MOD17 as well as 1：1,000,000 vegetation type data were used. Moisture in- dices including surface atmospheric vapor content, precipitation, aridity/humidity index, sur- face runoff, and temperature indices including average temperature, annual accumulated temperature, total solar radiation were selected. Based on ANUSPLIN spline function, GIS spatial analysis, wavelet analysis and landscape pattern analysis, regional differentiation characteristics and main-control factors of hydrothermal pattern, ecosystem structure and function in this region were analyzed to reveal the effects of terrain pattern o~ regional dif- ferentiation of eco-geographical elements. The results show that： influenced by terrain pattern moisture, temperature and heat in LRGR have shown significant distribution cllaracteristics as intermittent weft differences and continuous warp extension. Longitudinal mountains and valleys not only have a north-south corridor function and diffusion effect on the transfer of major surface materials and energy, but also have east-west barrier function and blocking effect. Special topographic pattern has important influences on vegetation landscape diversity and spatiat pattern of ecosystem structure and function, which is the main-control factor on vegetation landscape diversity and spatial distribution of ecosystem. Wavelet variance analysis reflects the spatial anisotropy of environmental factors, NDVI and NPP, while wavelet consistency analysis reveals the control factors on spatial distribution of NDVI and NPP as well as the quantitative relationship with control degree. Special terrain pattern in LRGR is the major influencing factor on eco-geographical regional differentiation in this region. Under the combined effect of zonality and non-zonality laws with ＂corridor-barrier＂ functior as the main characteristic, special spatial characteristics of eco-geographical regional system in LRGR is formed.
基金Supported by National Natural Science Foundation of China(41671528,41661064)
文摘Wind energy density was calculated based on average wind speed and air density,and the distribution of wind energy density and its relation with the distribution of sandstorm in Hexi Corridor in Gansu Province were revealed. Moreover,the ecological effect of wind power development on the reduction of local sandstorm and sand flow was estimated. The results show that if the maximum rotor power coefficient of a wind-driven generator is 0. 5,the forward movement speed of sand body( or desert)( 8 827 km × 1 m × 1 m) will reduce by 1 m every year through the development and conversion of wind energy resources in Hexi Corridor. If the proportion of exploitable wind energy resources is 50%,the forward movement speed of sand body( or desert)( 4 414 km × 1 m × 1 m) will decrease by 1 m every year. It is clearly seen that wind power industry has obvious effects on the control of sandstorm and sand flow. Wind energy resources in Hexi Corridor have great development potential,and wind power industry can bring both ecological and economic benefit to people.
