关键词: 城市, 城市, 防灾避险绿地系统, 构建

Abstract:

Pyrus ussrcensis is an excellent resource. We carried out an investigation to Pyrus ussrcensis resources of Yanshan Mountain and determined the internal and external fruit quality, providing reference for the development and utilization of resources. We collected different fruit plants of Yanshan Mountain Pyrus ussrcensis resources and measured the 13 quality indicators that affect the fruit quality. An appearance on the quality of the determination of pear, Suizhong was the largest, followed was Qian'an, Qinglong, Zunhua, Qianxi; Qian'an fruit peel was the thinnest, second was the Qinglong, Qianxi, Zunhua, Suizhong; Suizhong’fruit point was the least, followed was Qian'an, Zunhua, Qianxi, Qinglong; Qianxi’s fruit shape indices was the biggest, elliptical-shaped or conical, second was Suizhong, Qinglong, Qian'an, which was round or nearly round, minimum was Zunhua, which was the flat circular; Zunhua District in the pear fruit stalk up, followed was Qianxi, Qinglong, Suizhong, Qian'an. An inherent quality in the determination of Pyrus ussrcensis, Qian'an fruit flesh was most soft ,followed was Qinglong, Zunhua, Qianxi, Suizhong; Suizhong's content of soluble sugar was the highest, followed was Qianxi, Qian'an, Zunhua, Qinglong; Qianxi's total acid content of fruit was the lowest, followed was Qinglong, Suizhong, Qian'an, Zunhua; Zunhua's content of stone cells in Pyrus ussrcensis was the least, followed was Qianxi, Qinglong, Suizhong, Qian'an; Qianxi regional security pear fruit anthocyanin content was the highest followed was Qinglong, Qian'an, Suizhong, Zunhua; Suizhong's chlorophyll content of Pyrus ussrcensis was the highest, followed was Qinglong, Qianxi, Qian'an, Zunhua; Qian'an’s pear juice yield was the highest, followed was Suizhong, Zunhua, Qianxi, Qinglong; Zunhua's percentage of fruit pith was the smallest. Summing up, resources on quality of pear rate, Qian'an region was best in quality regional security, the Zunhua comprehensive regional quality was poor.