Citation:

Jiang, P., Liu, H., Piao, S., Ciais, P., Wu, X., Yin, Y., & Wang, H. (2019). Enhanced growth after extreme wetness compensates for post-drought carbon loss in dry forests. Nature Communications, 10(1), 195.

Abstract:

While many studies have reported that drought events have substantial negative legacy effects on forest growth, it remains unclear whether wetness events conversely have positive growth legacy effects. Here, we report pervasive and substantial growth enhancement after extreme wetness by examining tree radial growth at 1929 forest sites, satellite-derived vegetation greenness, and land surface model simulations. Enhanced growth after extreme wetness lasts for 1 to 5 years and compensates for 93 ± 8% of the growth deficit after extreme drought across global water-limited regions. Remarkable wetness-enhanced growths are observed in dry forests and gymnosperms, whereas the enhanced growths after extreme wetness are much smaller in wet forests and angiosperms. Limited or no enhanced growths are simulated by the land surface models after extreme wetness. These findings provide new evidence for improving climate-vegetation models to include the legacy effects of both drought and wet climate extremes.

Figure. Substantial enhanced radial growth after extreme wetness. Enhanced/reduced growth (unitless) after extreme wet/drought years was observed across 1929 tree-ring chronologies using the SPEI a, P−PET c, and soil moisture (for the 0–100 cm soil depth) e. Enhanced growth across sites that were significantly correlated with climate indices were reclassified into different mean annual precipitation bins and gymnosperm and angiosperm forest types b, d, f.

原文链接：https://www.nature.com/articles/s41467-018-08229-z