Scale relationships and linkages between woody vegetation communities along a large tropical floodplain river, north Australia

被引:9
|
作者
Petty, Aaron M. [1 ,2 ]
Douglas, Michael M.
机构
[1] Charles Darwin Univ, Sch Environm & Life Sci, Trop Savannas Cooperat Res Ctr, Darwin, NT 0909, Australia
[2] Univ Calif Davis, Dept Environm Sci & Policy, Davis, CA 95616 USA
基金
美国国家科学基金会;
关键词
Flood-pulse concept; hierarchical processes; Kakadu National Park; landscape pattern; Melaleuca; riparian tire regimes; river continuum concept; tropical savanna; vegetation distribution; wet-dry tropics; RIPARIAN VEGETATION; NATIONAL-PARK; GEOMORPHOLOGY; FIRE; ECOLOGY; FORESTS; REGENERATION; ECOSYSTEMS; TRANSVERSE; CALIFORNIA;
D O I
10.1017/S0266467409990319
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Riparian vegetation varies according to hydrogeomorphic processes operating across different scales over two didmensions: transversely (across-stream) and longitudinally (parallel to stream). We tested the hypothesis that vegetation patterns reveal the scale and direction of underlying processes. We correlated patterns of dominant woody vegetation with environmental variables at 28 sites located wit hill four geomorphologically distinct regions along the length of the South Alligator River catchment of Kakadu National Park, northern Australia. Across the catchment there existed a strong transverse boundary between upland savanna vegetation and two zones of riparian vegetation: Melaleuca-spp.-dominated closed-forest vegetation along stream channels and mixed open-woodland vegetation adjacent to closed forest. We surmise that there is hierarchic constraint oil smaller-scale catchment processes due to fire incursion into the riparian zone and access to water during the dry season. Within the closed-forest zone. vegetation did not vary transversely. but did longitudinally. Riparian woodlands also varied longitudinally, but ill the upper reaches varied independently of stream variables. By contrast. in the lower reaches woodland was strongly correlated with stream variables. The observed pattern of weak transverse linkages in headwaters but strong linkages Ill lower reaches is analogous to models developed for in-stream patterns and processes, particularly the river continuum and flood-pulse concepts.
引用
收藏
页码:79 / 92
页数:14
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