Urban greenland landscape structure in Urumchi City, northwestern China

The greenland landscape structure and distribution of urban greenland in Urumchi was analyzed adapted with high-differentiative QuickBird remote sensing image in 2002,used by eCognition on multi-resolution image segmentation and object-oriented image classification methods,applied with landscape patch order of landscape ecology.The results showed that urban greenland landscape patch area was 3 612 hm²;landscape patch number was 47 280 pieces.In terms of area and number of landscape patch,patch area was the largest and patch number was the most in the Xinshi Region,but the situation was absolutely opposite in the Shuimogou Region.In terms of the rate of greenland cover,the first was Shuimogou Region,the second was Tianshan Region,the third was Xinshi Region,and Shayibake Region was the last.Each region was far away from the landscape architecture standard of nationality.In greenland type,affiliated greenland patch area was the most,the second was public greenland and residential greenland,the third was shelter greenland and roadside greenland,while production greenland patch area was the lowest.In the distribution of greenland patch area,large patch beyond 10 000 m² was superiority by 49.56%.In the distribution of greenland patch number,small patch under 500 m² was superiority by 82.27%.In large patch,middile-large patch,middile patch as well as small patch,affiliated greenland was the most,residential greenland was second,production greenland was the lowest.In a word,greenland landscape distribution was not even.In recently,urban afforesting area is unceasingly increased and the urban afforesting quality is continuously improved in Urumchi,but is still far from the national landscape architecture standard.So Urumchi urban afforest assignment and ecological construction are important and difficult.In view of city land is insufficient,middle patch and small patch are linked up with eath other inside of urban,patch area is enlarged to middle-large patch of 3 000-(10 000) m².Production greenland is increased in the north of Urumchi,and shelter greenland is increased in the south of Urumchi.It is necessary and significant to analyze the urban greenland landscape structure in Urumchi.