2 / 2016-10-31 21:42:06

The ecological wisdom of the post-wild habitat construction addressing the plant community characteristics in cooling and humidifying effectiveness in semiarid urban green spaces

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As the northwest region's urbanization advancement improving, the contradiction between the urbanization and the fragile ecological environment was extruded gradually. Facing constraint of regional fragile ecological pressure, cities in northwestern need to create new ecological process using ecological wisdom during urbanization development. In this region, the wet and dry climate changes as the flood and drought with temporal distribution. Plant community design is the direct factors influencing the urban cooling and humidifying effectiveness, plants may improve the around microclimate by transpiration, such as different layering can produce different temperature levels and humidity level, thus plant community played a key role in urban living settlement and ecological environment.
In the contemporary landscape, the post-wild habitat is identified as the combination of community ecosystem and site design, means plant-to-plant, plant to place, plant to people. The Northwestern habitat green land is the green and ecological environment, which is rooted in a particular geographical area, ecological and cultural resources, and a place for biological growth. General principles of ecological landscape wisdom should focus on the improving the natural succession community through the artificial construction. The habitat construction should explore the relationship between plant community characteristics and human settlement. With people’s increasing ecological awareness, it is necessary construct the post-wild habitat landscape with strong resistance, stable structure, low maintenance cost and high landscape value in urban green space. As a result, it is extraordinary important for the assessment of the effectiveness of plant community characteristics in cooling and humidifying microclimates in semiarid urban green spaces, experimental analyzing the community numbers, structure, temperature, humidity of the habitat green land in Northeast region.
This study investigates post-wild habitat effect with small-scale plant communities in a semiarid urban green space. The results indicate that it is possible to relate the humidifying and cooling effects to the area, density and size of the plant community. The two Habitat construction experimental bases carried out theoretical research, experimental observation and practice. Our research measured community numbers, community structure of the habitat green land, and also included microclimate characteristics, including the wind speed, solar radiation, relative humidity and air temperature, at two Habitat Garden in Xi’an, China. The assessment of the urban greening was established on considering the canopy area, canopy density, tree height and the plant structures under the optimum soil water conditions and quasi-stationary thermal response. The canopy density and canopy area strongly affected the humidifying and cooling effects. The cooling effect of the site could change largely in tree-grass community, and the humidifying effect could change obviously in the multi-layer community. The humidifying and cooling effectiveness of the different plant community types may be ranked from high to low: multilayer community, tree-grass community, bamboo groves and ground cover. Multivariate linear regression indicated that canopy area; canopy density, tree height and solar radiation had an effect on the relative humidity increase and temperature reduction.