《wetland》杂志刊登“曼尼托巴省萨斯喀彻温河三角洲中的运用卫星影像得到大型植物对水位变动的响应”

作者：Mark S.Baschuk,Michael D.Ervin,William R.Clark,Llwellyn M.Armstrong,Dale A.Wrubleski and Gordon L.Goldsborough

刊物：《wetland》 2012年10月12日

关键词：遥感；挺水植物绘图；水位变动；基于目标；萨斯喀彻温河三角洲

摘要：本文采用快鸟卫星影像，基于目标的分类方法，绘制了加拿大曼尼托巴省萨斯喀彻温河三角洲湿地2007-2010年间挺水植物的响应变化。常用逻辑模型被用来进行三个低水位湿地和三个高水位湿地的植被种属分类。模型精度平均为74%，在部分低水位湿地中精度稍低（72%），在高水位湿地中精度稍高（77%）。在部分低水位湿地中，挺水植物（特别是香蒲属和苔草）在第一年低水位之后开始急剧衰老，但是在接下来几年中衰老区域渐渐减少。植物在缺水区域并没有完全死亡，并在低水位后的第三年开始恢复。由于三棱属的克隆性增殖，部分低水位湿地的开放水区域逐渐减少。高水位湿地的植被区域在整个研究期间保持不变。尽管部分水位的暂时性降低影响了挺水植物的生长，但是没有影响其种子的生长发育，没有导致植被在空间上实质性的、长时间的变化。高分辨率的卫星影像、基于目标的分类方法和逻辑模型的结合，对于研究这些偏远的北方湿地系统由管理带来的植被变化具有重要意义。

Using Satellite Imagery to Assess Macrophyte Response to Water-level Manipulations in the Saskatchewan River Delta, Manitoba

Journal：《wetland》

Key words: Remote sensing;Emergent macrophyte mapping; Water-level manipulations;Object-based;Saskatchewan River Delta

Abstract: QuickBird satellite imagery and object-based classification were used to map emergent macrophyte response in wetlands that were partially drawn down during a three-year period (2007–2010) in the Saskatchewan River Delta, Manitoba, Canada. Generalized logistic models were used to classify vegetation genera in three drawdown and three high-water (control) wetlands. User accuracy of models averaged 74%, and was lower in partial drawdown wetlands (72%) than in high-water wetlands (77%). In partial drawdown wetlands, emergent macrophytes (especially Typha spp. and Carex spp.) senesced significantly after the first year of lowered water levels but senescent areas decreased over following years. Plants were not completely dead in dewatered areas and emergent stands recovered by the third year after drawdown. Open water area in the partial drawdown wetlands gradually decreased due to clonal expansion of Sparganium spp. Vegetation areas in high-water wetlands remained unchanged throughout the study period. Although partial water-level drawdowns temporarily influenced the growth of emergent macrophytes they did not expose the seed bank and did not result in substantial, prolonged changes in spatial arrangement of vegetation areas. The combination of high-resolution satellite imagery, object-based classification and logistic modeling was useful for documenting vegetation response to management in these remote, boreal wetland systems.

原文链接：http://www.springerlink.com/content/727j882815476435/fulltext.html