Research On Gradient Feature And Scale Elapse Of Urban Areas

Zhengzhou as the Chinese intensive population city and the transportation key position city with quick economical development, its land utilization and the landscape pattern has had the huge change because of the rolling country vigorously development of southwest mountainous region in recent years. Therefore, the present paper chooses the Zhengzhou area the southwest quadrant to take the object of study, the use remote sensing and the geographic information system as well as the landscape pattern correlation statistics and the analysis method, from the city landscape pattern gradient characteristic and scale elapse, according to study the actual ecological environment question which in the region exists, studies project area landscape pattern the evolution and to the city ecological environment influence, synthetic evaluation southwest quality Zhengzhou the quadrant recent years ecological security condition, with the aid of the landscape ecology theory and the mentality, constructed the Zhengzhou region landscape ecological security pattern.The paper first has carried on the analysis to the Zhengzhou city land utilization change and the landscape pattern, take Zhengzhou 2009 Google satellite picture as the datum, selects southwest Zhengzhou the Zhengzhou city, the Xingyang city, the Xinmi city, the Gongyi city, the Dengfeng city altogether 9 2000m×2000m type spots for the main investigation region, and in the topographic diagram and in the land utilization present situation chart foundation, uses two level of landscape taxonomy, divides into 3 districts based on the terrain landform as well as the jamming strong and the weak difference:city, rolling country, mountainous area.Then acts according to the region landscape structure characteristic, refers to the nation land utilization classification method, divides into respectively each district 7 landscape essential factor type, respectively is:The water body, the cities use, the agriculture to use, the high density forest land, the density forest land, the low density forest land and the weed place.In order to study the southwest quadrant of Zhengzhou's landscape ecological security pattern, artificial will study the scope division will be 3 vertical gradient types (below city 200m, rolling country 200m-500m, above mountainous area 500m), according to far and near will divide into 3 horizontal criterion types from Agricultural College (each 25km is a region), will select the landscape multiplicity, the degree of dissociation, evenly divides equally indices and so on dimension, average form-exponent the quadrant carries on the data statistics and the result analysis to Zhengzhou southwest, will obtain various gradients and the criterion area landscape pattern characteristic, through to the different gradient and the criterion area landscape pattern change characteristic analysis, The result indicated that:(1) research area the landscape type mottling area difference is big, but the landscape change has not created the landscape type the rank constitution obvious change; (2) agriculture uses and the cities uses is disturbed the artificial activity and manages the most intense landscape type, although its shape the whole tends to the complication, but the overall far compared to the mountainous area landscape type, simply; (3) active enhancement which disturbs along with the humanity, the multiple indices not yet drop, the cities are rapid with the place area proportion increase, explained although artificial has the goal land development use not to cause the biological habitat multiplicity to drop, but the land utilization pattern has the huge change, how uses the land as well as the balance economic interest is reasonably an urgent question; (4) city landscape type stave speed must be quicker than the rolling country and the mountainous area speed, needs to strengthen the land utilization plan and the management. Through above analysis result proposed southwest current Zhengzhou the quadrant existence main question and the optimized countermeasure, as well as provide the scientific basis for the Zhengzhou city and countryside ecology construction and the landscape ecological security pattern construction.Finally, in the analysis of Zhengzhou city landscape ecological security pattern, based on the Zhengzhou nature foundational condition and the region landscape pattern present situation, as well as to the Zhengzhou natural ecology essential factor spatial distribution characteristic identification, has constructed the urban-rural integration's landscape ecological security pattern in Zhengzhou which composed by the ecology source, the ecology corridor, the ecology spot and the ecology wedge.