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Convergence across biomes to a common rain-use efficiency

机译:跨生物群落汇聚,实现共同的雨水利用效率

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Water availability limits plant growth and production in almost all terrestrial ecosystems(1-5). However, biomes differ substantially in sensitivity of aboveground net primary production ( ANPP) to between-year variation in precipitation(6-8). Average rain-use efficiency ( RUE; ANPP/precipitation) also varies between biomes, supposedly because of differences in vegetation structure and/or biogeochemical constraints(8). Here we show that RUE decreases across biomes as mean annual precipitation increases. However, during the driest years at each site, there is convergence to a common maximum RUE (RUEmax) that is typical of arid ecosystems. RUEmax was also identified by experimentally altering the degree of limitation by water and other resources. Thus, in years when water is most limiting, deserts, grasslands and forests all exhibit the same rate of biomass production per unit rainfall, despite differences in physiognomy and site-level RUE. Global climate models(9,10) predict increased between-year variability in precipitation, more frequent extreme drought events, and changes in temperature. Forecasts of future ecosystem behaviour should take into account this convergent feature of terrestrial biomes.
机译:可用水限制了几乎所有陆地生态系统的植物生长和生产(1-5)。然而,生物群落对地上净初级生产力(ANPP)对年际降水变化的敏感性差异很大(6-8)。生物群落之间的平均雨水利用效率(RUE; ANPP /降水)也有所不同,这可能是由于植被结构和/或生物地球化学的限制所致(8)。在这里,我们显示随着平均年降水量的增加,整个生物群落的RUE都会降低。但是,在每个站点最干旱的年份,会收敛到一个典型的干旱生态系统的最大最大RUE(RUEmax)。 RUEmax也通过实验改变水和其他资源的限制程度来确定。因此,在水最受限制的年份中,尽管相貌和站点水平RUE有所不同,但沙漠,草原和森林每单位降雨量的生物量生产率均相同。全球气候模型(9,10)预测年降水量之间的变异性增加,极端干旱事件更加频繁以及温度变化。对未来生态系统行为的预测应考虑到陆地生物群落的趋同特征。

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