Local and landscape effects on spatial patterns of mangrove forest during wetter and drier periods: Moreton Bay,Southeast Queensland,Australia |
| |
| Authors: | L Eslami-Andargoli PER Dale N Sipe J Chaseling |
| |
| Institution: | 1. Griffith School of Environment, Griffith University, Nathan Campus, Nathan Queensland 4111, Australia;2. Environmental Futures Centre, Australia;3. Urban Research Program, Australia |
| |
| Abstract: | Land use/cover and mangrove spatial changes were assessed for ten sites and their sub-catchments in Southeast Queensland, Australia. Two time periods were involved: 1972–1990, a period of relatively high rainfall, and 1990–2004, which was significantly drier. Aerial photographs and Landsat satellite imagery were used to map the inter-tidal wetlands and classify the land use/cover in the sub-catchments. A Maximum Likelihood Classification was used to map three types of land cover: agriculture, built-up and plantation forest. Mangroves (mainly Avicennia marina) were the focus as they have been recorded over recent decades encroaching into salt marsh. The Mangrove-Salt marsh Interface (MSI) Index was developed to quantify the relative opportunity for mangroves to expand into salt marshes, based on the shared boundary between them. The index showed a consistent relationship with mangrove expansion and change. To address problems of high dimensionality and multi-collinearity of predictor variables, a Partial Least Squares Regression (PLSR) model was used. A key finding of this research was that the contribution of environmental variables to spatial changes in the mangroves was altered following a reduction in rainfall. For example, agriculture had more influence on mangrove expansion and change during the wet period than during the dry period. |
| |
| Keywords: | Mangroves rainfall Mangrove-salt marsh interface index land use regression analysis (partial least squares) Australia Moreton Bay |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
