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Geodiversity in the Yellow River source zone

Journal of Geographical Sciences 2013年第5期23卷 775-792页

作者： Brendon BLUE Gary BRIERLEY YU Guo-an School of Environment University of Auckland Private Bag 92019 Auckland New Zealand Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

It is a key premise of ＇ecosystem approaches＇ to natural resources management that we must have an appropriate understanding of biodiversity values, and controls upon them, if we wish to manage them effectively. These biodiversity values, and associated ecosystem functionality, vary with space and time and are tied directly to landscape-scale relationships and evolutionary traits. In riverine systems, nested hierarchical principles provide a useful platform to assess relationships between landscape components across a range of scales. These understandings are most instructively synthesized through catchment-scale analyses. This paper outlines a rationale for systematic catchment-wide appraisals of river geodiversity. An initial application of these principles is presented for the Yellow River source zone in Qinghai Province, western China. Geo-ecological relationships are outlined for five broad sections of the trunk stream, highlighting implications for the management of these individual landscape compartments and for the system as a whole.

关键词： geodiversity river classification anabranching Qinghai-Tibet Plateau Sanjiangynan Yellow River source zone

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Classification of River Reaches on the Little Disturbed East Alligator River, Northern Australia

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International Journal of Geosciences 2013年第6期4卷 53-65页

作者： Michael John Saynor Wayne D. Erskine 1Environmental Research Institute of the Supervising Scientist Darwin Australia 2School of Environmental and Life Sciences The University of Newcastle Ourimbah Campus Ourimbah Australia 3Research Institute for the Environment and Livelihoods Charles Darwin University Darwin Australia Environmental Research Institute of the Supervising Scientist Darwin Australia

The East Alligator River drains a 7000 km2 catchment in northern Australia comprised largely of Aboriginal land and has a very low average population density of about 0.15 persons per km2. River reaches were classified according to geomorphic features on both the East Alligator River and its major tributary, Magela Creek, next to which is located the Ranger uranium mine. Sixteen reaches were described for the 241.4 km of the East Alligator River and ten reaches were described for the 118.8 km of Magela Creek. The dominant river types on the East Alligator River were various types of anabranching rivers, sandstone gorges and cuspate tidal meanders. On Magela Creek the dominant river types were wetlands and channel billabongs, island anabranching and sandstone gorges. It is unusual for anabranching rivers and gorges to be so dominant. Current river classification schemes could not accommodate all the various river types and need to be modified so that tidal channels are covered in more detail and so that the classification of anabranching rivers recognises that sand-bed varieties occur in partly confined valley settings.

关键词： River Reaches River Types Sandstone Gorge anabranching Rivers Cuspate Tidal Meanders Wetlands and Channel Billabongs

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