摘要
运用GIS、RS和GPS技术,采用1994和2004年2个时期的TM影像建立了植被分类系统,分析了2个时期的植被景观格局特征及其变化,并利用马尔柯夫模型,对未来该区域植被景观的动态变化进行了预测。结果表明,怒江流域中段植被景观以灌草丛为基质,其他景观类型镶嵌于其中。1994—2004年,各种植被景观类型之间发生转移最多的是在灌草丛、半湿润常绿阔叶林和针阔混交林之间。变化最大的是海拔较低的灌草丛和半湿润常绿阔叶林等;海拔较高的针阔混交林、寒温性针叶林等的变化均不明显。结果预示,未来10年,人为干扰对整个流域植被演替的影响将进一步加强,灌草丛、寒温性针叶林等面积不断增加,半湿润常绿阔叶林和中山湿性常绿阔叶林面积不断减少,景观整体趋于破碎化,研究区的生态环境受到人类活动严重影响。
By using GIS, RS and GPS techniques and the TM images of 1994 and 2004, the changes of vegetation landscape patterns in central Nujiang watershed in 1994-2004 were studied, and the prediction of the changes in next ten years was made by using Markov process model. The results showed that the matrix of the landscape in study area was composed of shrub and grass, with other landscape patches embedded. In 1994-2004, the most transfers among land- scape types were between shrub-grass, semi-humid evergreen broadleaved forest, and coniferousbroadleaved mixed forest. The greatest change occurred in shrub-grass and semi-humid evergreen broadleaved forest at low elevation, while no obvious change was observed in coniferous-broadleaved mixed forest and cold temperate coniferous forest at high elevation. It was predicted that in the next ten years, the influence of human interference on the vegetation succession in the whole watershed would be further increased, the areas of shrub-grass and cold temperate coniferous forest would increase while those of semi-humid evergreen broadleaved forest and humid evergreen broadleaved forest would decrease, the landscape as a whole would be fragmented, and the regional eco-environment would be seriously affected.
出处
《生态学杂志》
CAS
CSCD
北大核心
2009年第2期371-376,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(50468004)
云南大学青年骨干教师培养计划资助项目
