CARBON-ISOTOPE FRACTIONATION
; NET ECOSYSTEM EXCHANGE
; MESOPHYLL CONDUCTANCE
; STOMATAL CONDUCTANCE
; FOREST TREES
; DROUGHT
; CO2
; RESPONSES
; CLIMATE
; GROWTH
WOS学科分类:
Plant Sciences
WOS研究方向:
Plant Sciences
英文摘要:
Species-specific responses of plant intrinsic water-use efficiency (iWUE) to multiple environmental drivers associated with climate change, including soil moisture (theta), vapor pressure deficit (D), and atmospheric CO2 concentration (c(a)), are poorly understood. We assessed how the iWUE and growth of several species of deciduous trees that span a gradient of isohydric to anisohydric water-use strategies respond to key environmental drivers (theta, D and c(a)). iWUE was calculated for individual tree species using leaf-level gas exchange and tree-ring delta C-13 in wood measurements, and for the whole forest using the eddy covariance method. The iWUE of the isohydric species was generally more sensitive to environmental change than the anisohydric species was, and increased significantly with rising D during the periods of water stress. At longer timescales, the influence of c(a) was pronounced for isohydric tulip poplar but not for others. Trees' physiological responses to changing environmental drivers can be interpreted differently depending on the observational scale. Care should be also taken in interpreting observed or modeled trends in iWUE that do not explicitly account for the influence of D.
1.Indiana Univ Bloomington, Sch Publ & Environm Affairs, 1315 East Tenth St, Bloomington, IN 47405 USA 2.Indiana Univ Bloomington, Dept Geog, 701 East Kirkwood Ave, Bloomington, IN 47405 USA 3.US Forest Serv, USDA, Northern Res Stn, 1831 Highway 169 East, Grand Rapids, MN 55744 USA 4.Indiana Univ Bloomington, Dept Geol Sci, 1001 East Tenth St, Bloomington, IN 47405 USA 5.Indiana Univ Bloomington, Dept Biol, 1001 East Third St, Bloomington, IN 47405 USA
Recommended Citation:
Yi, Koong,Maxwell, Justin T.,Wenzel, Matthew K.,et al. Linking variation in intrinsic water-use efficiency to isohydricity: a comparison at multiple spatiotemporal scales[J]. NEW PHYTOLOGIST,2019-01-01,221(1):195-208