Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects o...Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects of patch composition and level of category and landscape.The result showed that there were manymin-sized patches in Tianjin City while large patches occupied a large proportion of the total area of green space.Green spaces were unbalanced in distribution and unreasonable in structure.It suggested adjusting the structure of urban green space,reducing the degree of landscape fragmentation,strengthening the construction of large and mid-sized green patches,so as to improve ecological function of green space.展开更多
With the rapid urbanization in Beijing, the vegetated surfaces have been increasingly replaced by impervious built surfaces. A clear recognition on the changes in green spaces pattern is vital for urban administrators...With the rapid urbanization in Beijing, the vegetated surfaces have been increasingly replaced by impervious built surfaces. A clear recognition on the changes in green spaces pattern is vital for urban administrators and planners to optimize the urban development areas and define the ecological protection red lines. Based on the SPOT images and field investigation data of urban green spaces within the sixth ring road of Beijing in 2000, 2005 and 2010, the study investigated the dynamic changes of urban green spaces in this area, by means of GIS techniques and landscape ecology methods. The results indicated that green spaces in Beijing have decreased by 207 km2 from 2000 to 2010 at the expense of agricultural lands and waters. Although there has been some increases in urban forests and grasslands, it cannot compensate the rapid decrease of urban green spaces. The land cover types conversion occurred mainly in the areas between the fifth and sixth ring roads while the zones encircled by the fourth ring road had a little change. In addition, landscape metrics such as number of patches(NP) and shape index(SHAPE) increased, but the mean nearest-neighbor distance(MNN), aggregation index(AI) and patch cohesion index(COHESION) decreased during the period of 2000-2010. Also green landscapes became considerably isolated and fragmented. The study disclosed the obvious changes of green space size, composition and layout in urban districts of Beijing City from 2000 to 2010, and highlighted that construction of urban green space should consider not only the geometric or aesthetic effect, but also the increase of vertical green volume and optimization of spatial layout to fully develop the ecological service functions of green spaces.展开更多
Taking the green space systems in Yifeng Township for an example, this paper analyzed the characteristics and planning principles of green space system in small towns under the background of rapid urbanization. It als...Taking the green space systems in Yifeng Township for an example, this paper analyzed the characteristics and planning principles of green space system in small towns under the background of rapid urbanization. It also proposed the construction of stable ecological green space pattern of towns, the development of forest-type green space and the planning ideas of green space system in small towns that can embody regional context and implement multifunctional composite.展开更多
研究城市绿地景观格局对地表径流的影响,旨在为优化城市绿地景观格局、减轻洪涝灾害提供研究基础和一定的理论依据。以昆明市建成区为范围,基于遥感影像及现场调查计算绿地格局指数,利用SWMM(Storm Water Management Model)模型模拟雨...研究城市绿地景观格局对地表径流的影响,旨在为优化城市绿地景观格局、减轻洪涝灾害提供研究基础和一定的理论依据。以昆明市建成区为范围,基于遥感影像及现场调查计算绿地格局指数,利用SWMM(Storm Water Management Model)模型模拟雨水径流。结果表明:①子汇水区径流总量和径流峰值随着降雨重现期的增加而增加,更大的子汇水区面积可以有效延长洪峰出现的时间;②绿地斑块密度一致时,具有低LSI、DIVISION值的子汇水区其径流量和径流峰值较低,洪峰出现时间早,反之径流量和径流峰值高,峰值出现的时间晚;③绿地斑块面积一致时,较小PD、LSI、DIVISION值可抑制径流的形成,同时更大的子汇水区面积可以有效延长洪峰出现的时间;④绿地斑块形状一致时,低IJI、DIVISION值形成的径流总量和径流峰值较低,且大面积连续的绿地可有效延长洪峰出现的时间。因此,城市绿地景观格局对地表径流具有显著影响,可以通过增加绿地密度、和绿地之间的聚集度来降低地表径流。展开更多
基金Supported by Natural Science Foundation of China (41001022)Funds for Talents' Introduction of Tianjin Normal University (5RL077,5RL076)~~
文摘Based on IKONOS satellite image in August of 2008,and by using GIS technique and spatial pattern analysis software FRAGSTATS,the paper analyzed landscape pattern of urban green space in Tianjin City from the aspects of patch composition and level of category and landscape.The result showed that there were manymin-sized patches in Tianjin City while large patches occupied a large proportion of the total area of green space.Green spaces were unbalanced in distribution and unreasonable in structure.It suggested adjusting the structure of urban green space,reducing the degree of landscape fragmentation,strengthening the construction of large and mid-sized green patches,so as to improve ecological function of green space.
基金Sponsored by Study on Space-time Rules of Beijing Urban Green Space Ecosystem Regulating Rainwater Runoff and Control Countermeasures(31200531)
文摘With the rapid urbanization in Beijing, the vegetated surfaces have been increasingly replaced by impervious built surfaces. A clear recognition on the changes in green spaces pattern is vital for urban administrators and planners to optimize the urban development areas and define the ecological protection red lines. Based on the SPOT images and field investigation data of urban green spaces within the sixth ring road of Beijing in 2000, 2005 and 2010, the study investigated the dynamic changes of urban green spaces in this area, by means of GIS techniques and landscape ecology methods. The results indicated that green spaces in Beijing have decreased by 207 km2 from 2000 to 2010 at the expense of agricultural lands and waters. Although there has been some increases in urban forests and grasslands, it cannot compensate the rapid decrease of urban green spaces. The land cover types conversion occurred mainly in the areas between the fifth and sixth ring roads while the zones encircled by the fourth ring road had a little change. In addition, landscape metrics such as number of patches(NP) and shape index(SHAPE) increased, but the mean nearest-neighbor distance(MNN), aggregation index(AI) and patch cohesion index(COHESION) decreased during the period of 2000-2010. Also green landscapes became considerably isolated and fragmented. The study disclosed the obvious changes of green space size, composition and layout in urban districts of Beijing City from 2000 to 2010, and highlighted that construction of urban green space should consider not only the geometric or aesthetic effect, but also the increase of vertical green volume and optimization of spatial layout to fully develop the ecological service functions of green spaces.
文摘Taking the green space systems in Yifeng Township for an example, this paper analyzed the characteristics and planning principles of green space system in small towns under the background of rapid urbanization. It also proposed the construction of stable ecological green space pattern of towns, the development of forest-type green space and the planning ideas of green space system in small towns that can embody regional context and implement multifunctional composite.
文摘研究城市绿地景观格局对地表径流的影响,旨在为优化城市绿地景观格局、减轻洪涝灾害提供研究基础和一定的理论依据。以昆明市建成区为范围,基于遥感影像及现场调查计算绿地格局指数,利用SWMM(Storm Water Management Model)模型模拟雨水径流。结果表明:①子汇水区径流总量和径流峰值随着降雨重现期的增加而增加,更大的子汇水区面积可以有效延长洪峰出现的时间;②绿地斑块密度一致时,具有低LSI、DIVISION值的子汇水区其径流量和径流峰值较低,洪峰出现时间早,反之径流量和径流峰值高,峰值出现的时间晚;③绿地斑块面积一致时,较小PD、LSI、DIVISION值可抑制径流的形成,同时更大的子汇水区面积可以有效延长洪峰出现的时间;④绿地斑块形状一致时,低IJI、DIVISION值形成的径流总量和径流峰值较低,且大面积连续的绿地可有效延长洪峰出现的时间。因此,城市绿地景观格局对地表径流具有显著影响,可以通过增加绿地密度、和绿地之间的聚集度来降低地表径流。
