Responses to air temperature and soil moisture of growth of four dominant species on sand dunes of central Inner Mongolia |
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Authors: | Yuanrun Zheng Glyn M Rimmington Zhixiao Xie Lei Zhang Ping An Guangsheng Zhou Xiangjun Li Yunjiang Yu Lijun Chen Hideyuki Shimizu |
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Institution: | (1) State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, 100093 Beijing, China;(2) Office of Global Learning, Wichita State University, Wichita, KS 67260-0142, USA;(3) Geosciences Department, Florida Atlantic University, Boca Raton, FL 33431, USA;(4) Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China;(5) Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan;(6) National Institute for Environmental Studies, Tsukuba 305-8506, Japan |
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Abstract: | Little attention has been paid to how four dominant shrub species distributed in semi-arid areas respond to the combined effects
of temperature and water supply. Seedlings of four species were grown in a glasshouse for eight weeks at air temperatures
of 12.5/22.5, 15/25, 17.5/27.5, and 20/30°C (night/day) and with water supplies of 37.5, 75, 112.5, and 150 mm per month.
When temperatures were 17.5/27.5 and 20/30°C relative growth rate (RGR) decreased for Artemisia
ordosica, A.
sphaerocephala, and Hedysarum laeve but not for Caragana korshinskii. RGR increased with increasing water availability for all four species and most treatments. In response to changing water
availability, the RGR tended to correlate mainly with the physiological trait (net assimilation rate, NAR) and with dry matter
allocation traits (below-ground to above-ground dry matter and leaf mass ratio). A higher ratio of below to above-ground dry
matter for all four species under most treatments (0.3–1.7) and water-use efficiency (1.4–9.2 g kg−1) may explain how all four species survive drought. Higher temperatures may be harmful to A. ordosica and A. sphaerocephala, under current precipitation levels (average 75 mm per month from mid-June to mid-August). These findings support the proposal
that A. ordosica mixed with C. korshinskii will prove optimal for re-vegetation of degraded areas of the Ordos plateau.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Biomass allocation Growth Semi-arid regions Temperature Water supply |
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