森林、火灾和植被变化对墨累-达令盆地水资源的影响

IF 2.4 Q2 WATER RESOURCES Australasian Journal of Water Resources Pub Date : 2023-01-02 DOI:10.1080/13241583.2023.2179555
P. Lane, R. Benyon, R. Nolan, R. Keenan, Lu Zhang
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引用次数: 1

摘要

摘要墨累-达令河水系可能是澳大利亚最重要的水系,具有重要的社会、文化和环境价值,包括16个列入拉姆萨尔湿地名录的湿地。MDB拥有260万人口,每年生产价值约240亿美元的农业产品(约占澳大利亚总价值的三分之一)。以水的可用性和质量为代表的水文问题已经存在多年,在1997年至2010年的千年干旱期间达到顶峰。在21世纪初中期,相互竞争的利益(即灌溉、旅游、环境卫生),以及干旱期间流量和水质的下降,导致政府和水管理机构考虑系统中水资源的风险。本文回顾了造林和森林大火等与森林动态相关的风险变化,并考虑了自该分析以来出现的新问题。研究发现,在过去的研究中,山火对溪流流量的潜在影响被高估了,而且没有计划将大规模植树造林扩展到农业和牧场,以减少溪流流量。虽然这两种风险现在似乎不太可能对流量产生重大的未来影响,或对下游用户产生后续影响,但二氧化碳升高和温度升高对植被功能的相互作用以及随后在集水区范围内的水文后果需要进一步的研究和分析。未来气候变化下的降雨量减少和气温升高可能会对投入和流量产生影响。这些变化的不确定性,以及气候、干旱、更频繁的火灾和植被反应之间的反馈,对系统水文的影响,也需要进一步调查。
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Forests, fire and vegetation change impacts on Murray-Darling basin water resources
ABSTRACT The Murray-Darling River system is perhaps Australia’s most important, with significant social, cultural and environmental values including 16 Ramsar listed wetlands. The MDB is home to 2.6 million people and produces about $24 billion worth in agricultural production each year (about one-third of total value for Australia). Hydrologic issues, typified by water availability and quality, have existed for many years, peaking during the Millennium drought from 1997 to 2010. Competing interests (i.e. irrigation, tourism, environmental heath), and the declining flows and water quality during droughts, led governments and water management agencies to consider the risks to water resources in the system in the early-mid 2000s. This paper reviews changes to risks associated with forest dynamics, as identified by - afforestation and bushfire – and considers new issues that have emerged since that analysis. It was found that the potential impacts of bushfire on stream flows were over-estimated in past studies, and that a planned significant afforestation expansion into agricultural and grazing land that was projected to reduce stream flows did not occur. While these two risks now do not seem likely to have significant future impacts on flows, or consequent effects on downstream users, the interaction of elevated CO2 and increasing temperatures on vegetation functioning and subsequent hydrologic consequences at catchment scale require further research and analysis. Reduced rainfall and increased temperatures under future climate change are likely to have an impact on inputs and flows. Uncertainties in how these changes, and feedbacks between climate, drought, more frequent fire and vegetation responses, impact on system hydrology also require further investigation.
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来源期刊
CiteScore
5.10
自引率
21.90%
发文量
25
期刊介绍: The Australasian Journal of Water Resources ( AJWR) is a multi-disciplinary regional journal dedicated to scholarship, professional practice and discussion on water resources planning, management and policy. Its primary geographic focus is on Australia, New Zealand and the Pacific Islands. Papers from outside this region will also be welcomed if they contribute to an understanding of water resources issues in the region. Such contributions could be due to innovations applicable to the Australasian water community, or where clear linkages between studies in other parts of the world are linked to important issues or water planning, management, development and policy challenges in Australasia. These could include papers on global issues where Australasian impacts are clearly identified.
期刊最新文献
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