关键词: 遗传关系, 遗传关系

Abstract:

In order to reveal the characteristics and existing problems of Ningyuan River basin landscape, based on the data from forest resources survey in Hainan Province in 2010, under the support of ARCGIS 9.2 and FRAGSTATS 3.3, the author analyzed the forest landscape pattern of Ningyuan River basin from composition and plaque distribution, plaque feature, heterogeneity and spatial distribution. The results showed that forestry landscape was the main type in Ningyuan River basin for the reason that the area of forestry landscape accounted for 85.05% of the total area and the number of patches accounted for 83.39%. The results also showed that the scheduling of the area of each patch type was as follows: broadleaved mixed forest (42949.05 hm2)＞rubber (14678.66 hm2)＞non-forested land (14378.50 hm2)＞betel nut (4236.73 hm2)＞mango (3857.55 hm2)＞pine (1872.70 hm2)＞eucalyptus (1713.98 hm2)＞acacia (1655.16 hm2)＞other economic forest (402.63 hm2)＞broad leaved (377.95 hm2)＞bamboo forest (27.68 hm2). Broadleaved mixed forest, rubber, betel nut and mango took absolute advantage in forestry landscape and it was not distributed for each patch type. The patches of the whole landscape were adjacent to each other, spatial distribution was in equilibrium and the fragmentation degree was low. In comparison, landscape of bamboo forest was the most severely influenced by human.