Volltext verfügbar nach Anmeldung bzw. im Campus-Netz.
Changes in vegetation and surface water balance at basin-scale in Central China with rising atmospheric CO.sub.2
In: Climatic Change, Jg. 155 (2019-08-01), Heft 3, S. 437-454
Online
academicJournal
Zugriff:
Byline: Richao Huang (1,2), Xi Chen (3), Qi Hu (4) Abstract: Elevated atmospheric CO.sub.2 concentration alters vegetation growth and composition, increases plant water use efficiency (WUE), and changes surface water balance. These changes and their differences between wet and dry climate are studied at a mid-latitude experiment site in the Loess Plateau of China. The study site, the Jinghe River basin (JRB), covers an area of 43,216 km.sup.2 and has a semiarid climate in the north and a semi-humid climate in the south. Two simulations from 1965 to 2012 are made using a site-calibrated Lund--Potsdam--Jena dynamic global vegetation model: one with the observed rise of the atmospheric CO.sub.2 from 319.7--391.2 ppmv, and the other with a fixed CO.sub.2 at the level of 1964 (318.9 ppmv). Analyses of the model results show that the elevated atmospheric CO.sub.2 promotes growth of woody vegetation (trees) and causes a 6.0% increase in basin-wide net primary production (NPP). The NPP increase uses little extra water however because of higher WUE. Further examination of the surface water budget reveals opposite CO.sub.2 effects between semiarid and semi-humid climates in the JRB. In the semiarid climate, plants sustain growth in higher CO.sub.2 because of the higher level of intracellular CO.sub.2 and therefore WUE, thus consuming more water and causing a greater decrease of surface runoff than in the fixed-lower CO.sub.2 case. In the semi-humid climate, NPP also increases but by a smaller amount than in the semiarid climate. Plant transpiration (E .sub.T) and total evapotranspiration (E) decrease in the elevated CO.sub.2 environment, yielding the increase of runoff. This asymmetry of the effects of elevated atmospheric CO.sub.2 exacerbates drying in the semiarid climate and enhances wetness in the semi-humid climate. Furthermore, plant WUE (=NPP/E .sub.T) is found to be nearly invariant to climate but primarily a function of the atmospheric CO.sub.2 concentration, a result suggesting a strong constraint of atmospheric CO.sub.2 on biophysical properties of the Earth system. Author Affiliation: (1) 0000 0004 1760 3465, grid.257065.3, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China (2) 0000 0004 1760 3465, grid.257065.3, College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China (3) 0000 0004 1761 2484, grid.33763.32, Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China (4) 0000 0004 1937 0060, grid.24434.35, School of Natural Resources and Department of Earth and Atmospheric Sciences, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA Article History: Registration Date: 03/06/2019 Received Date: 13/07/2018 Accepted Date: 03/06/2019 Online Date: 21/06/2019
Titel: |
Changes in vegetation and surface water balance at basin-scale in Central China with rising atmospheric CO.sub.2
|
---|---|
Autor/in / Beteiligte Person: | Huang, Richao ; Chen, Xi ; Hu, Qi |
Link: | |
Zeitschrift: | Climatic Change, Jg. 155 (2019-08-01), Heft 3, S. 437-454 |
Veröffentlichung: | 2019 |
Medientyp: | academicJournal |
ISSN: | 0165-0009 (print) |
DOI: | 10.1007/s10584-019-02475-w |
Schlagwort: |
|
Sonstiges: |
|