当前位置： SCI文献检索 > NATURE期刊下所有文献 > Ecosystem resilience despite large-scale altered hydroclimatic conditions.

Ecosystem resilience despite large-scale altered hydroclimatic conditions.

Abstract：

:Climate change is predicted to increase both drought frequency and duration, and when coupled with substantial warming, will establish a new hydroclimatological model for many regions. Large-scale, warm droughts have recently occurred in North America, Africa, Europe, Amazonia and Australia, resulting in major effects on terrestrial ecosystems, carbon balance and food security. Here we compare the functional response of above-ground net primary production to contrasting hydroclimatic periods in the late twentieth century (1975-1998), and drier, warmer conditions in the early twenty-first century (2000-2009) in the Northern and Southern Hemispheres. We find a common ecosystem water-use efficiency (WUE(e): above-ground net primary production/evapotranspiration) across biomes ranging from grassland to forest that indicates an intrinsic system sensitivity to water availability across rainfall regimes, regardless of hydroclimatic conditions. We found higher WUE(e) in drier years that increased significantly with drought to a maximum WUE(e) across all biomes; and a minimum native state in wetter years that was common across hydroclimatic periods. This indicates biome-scale resilience to the interannual variability associated with the early twenty-first century drought--that is, the capacity to tolerate low, annual precipitation and to respond to subsequent periods of favourable water balance. These findings provide a conceptual model of ecosystem properties at the decadal scale applicable to the widespread altered hydroclimatic conditions that are predicted for later this century. Understanding the hydroclimatic threshold that will break down ecosystem resilience and alter maximum WUE(e) may allow us to predict land-surface consequences as large regions become more arid, starting with water-limited, low-productivity grasslands.

journal_name

Nature

journal_title

Nature

authors

Ponce Campos GE,Moran MS,Huete A,Zhang Y,Bresloff C,Huxman TE,Eamus D,Bosch DD,Buda AR,Gunter SA,Scalley TH,Kitchen SG,McClaran MP,McNab WH,Montoya DS,Morgan JA,Peters DP,Sadler EJ,Seyfried MS,Starks PJ

doi

10.1038/nature11836

subject

Has Abstract

pub_date

2013-02-21 00:00:00

pages

349-52

issue

7437

eissn

0028-0836

issn

1476-4687

pii

nature11836

journal_volume

494

pub_type

历史文章,杂志文章

在线工具

Ecosystem resilience despite large-scale altered hydroclimatic conditions.