降雨量是森林植物生产量的关键决定因子，而在干旱地区，初级生产量随降雨量的增加大致是一个线性增长。
Precipitation is a key determinant of plant productivity in forest, whilst in arid regions there is an approximately liner increase in primary productivity with increasing precipitation.
而在一些干旱地区这个物理规律却使得水分蒸发更快、干旱情况更加严重，我们可以从澳洲的莫瑞达令河流域农业旱情严重发现这一情况。
In arid places the same physics amplify evaporation and drought, visible in the dust-dry farms of the Murray-Darling River Basin in Australia.
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