Has water limited our imagination for aridland biogeochemistry?
Has water limited our imagination for aridland biogeochemistry?
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DOI：
10.1016/j.tree.2011.02.003
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发表时间：
2011-05-01
影响因子：
16.8
通讯作者：
Austin, Amy T.
中科院分区：
文献类型：
--
作者：
Austin, Amy T.
沙漠的经典生态范例，即所有过程都由水的可用性控制，限制了我们探索干旱地区生态系统中碳和养分循环的其他控制的想象力。这一审查最近的研究确定了替代机制，挑战的想法，在干旱地区的所有土壤过程是profectile水有限的，并强调了地上垃圾的光降解的意义和压倒一切的重要性，空间异质性作为调制器的生物响应水的可用性。干旱地区目前占陆地面积的30%以上，而且正在扩大。因此，至关重要的是，将这些以前未被重视的机制纳入我们对干旱土地生态地球化学的理解，以减轻荒漠化和全球变化的影响。
The classic ecological paradigm for deserts, that all processes are controlled by water availability, has limited our imagination for exploring other controls on the cycling of carbon and nutrients in aridland ecosystems. This review of recent studies identifies alternative mechanisms that challenge the idea that all soil processes in aridlands are proximately water-limited, and highlights the significance of photodegradation of aboveground litter and the overriding importance of spatial heterogeneity as a modulator of biotic responses to water availability. Aridlands currently occupy >30% of the terrestrial land surface and are expanding. It is therefore critical to incorporate these previously unappreciated mechanisms in our understanding of aridland biogeochemistry to mitigate the effects of desertification and global change.