Stable isotope analysis of water sources for Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China
- 56 Downloads
The complex interactions in desert ecosystems between functional types and environmental conditions could be reflected by plant water use patterns. However, the mechanisms underlying the water use patterns as well as the water sources of Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China, remain unclear. This study investigated the water sources and water use patterns of T. laxa using the stable oxygen isotope method. The δ18O values of xylem water, soil water in different layers (0–200 cm), rainwater, snow water, lake water, atmospheric water vapor, condensate water, and groundwater were measured. The sources of water used by T. laxa were determined using the IsoSource model. The results indicate that T. laxa mainly relies on soil water. At the beginning of the growing season (in May), the species is primarily dependent on water from the middle soil layer (60–120 cm) and deep soil layer (120–200 cm). However, it mainly absorbs water from the shallow soil layer (0–60 cm) as the rainy season commences. In September, water use of T. laxa reverts to the deep soil layer (120–200 cm). The water use patterns of T. laxa are closely linked with heavy precipitation events and soil water content. These findings reveal the drought resistance mechanisms of T. laxa and are of significance for screening species for ecological restoration.
Keywordsstable oxygen isotope water source water use pattern soil water stem water mega-dune Tamarix laxa
Unable to display preview. Download preview PDF.
This study was supported by the National Natural Science Foundation of China (41530745, 41371114, 41361004). The authors are grateful to the State Key Laboratory Breeding Base of Desertification and Aeolian Sand Disaster Combating, Gansu Desert Control Research Institute for providing support for sample testing.
- Cao L Y, Lu Q, Lin G H. 2002. Review and perspective on hydrogen stable isotopes technique in tracing plant water sources researches. Acta Ecoloica Sinica, 22(1): 111–117. (in Chinese)Google Scholar
- Dawson T E. 1993. Water sources of plants as determined from xylem-water isotopic composition: perspectives on plant competition, distribution, and water relations. In: Ehleringer J R, Hall A E, Farquhar G D. Stable Isotopes and Plant Carbon-Water Relations. San Diego: Academic Press, 465–496.CrossRefGoogle Scholar
- Li H, Zhou H F. 2006. Application characteristics and mechanism of stable isotope techniques in the study of eco-hydrological progresses in arid regions. Arid Land Geography, 29(6): 810–816. (in Chinese)Google Scholar
- Liu J, Song X, Yuan G, et al. 2014. Stable isotopic compositions of precipitation in China. Tellus B: Chemical and Physical Meteorology, 66(1): 39–44.Google Scholar
- Liu X P, Zhang T H, Zhao H L, et al. 2006. Influence of dry sand bed thickness on soil moisture evaporation in mobile dune. Arid Land Geography, 29(4): 523–526. (in Chinese)Google Scholar
- Ma N, Wang N A, Zhu J F, et al. 2011. Climate change around the Badain Jaran Desert in recent 50 years. Journal of Desert Research, 31(6): 1541–1547. (in Chinese)Google Scholar
- Ma X N, Zhang M J, Li Y J, et al. 2012. Research advances on stable isotopes in soil water. Soils, 44(4): 554–561.Google Scholar
- Peng S Z, Zhao C Y, Peng H H, et al. 2010. Spatial distribution of Tamarix ramosissima aboveground biomass and water consumption in the lower reaches of Heihe River, Northwest China. Chinese Journal of Applied Ecology, 21(8): 1940–1946. (in Chinese)Google Scholar
- Qin D H, Stocker T. 2014. Highlights of the IPCC working group–fifth assessment report. Progressus Inquisitiones de Mutatione Climatis, 10(1): 1–6. (in Chinese)Google Scholar
- Xiao H L, Li S, Chen Y B, et al. 2014. Atmospheric water vapor absorption-an important source of water for desert plants. Geography Education, (7): 4–7. (in Chinese)Google Scholar
- Xu X Y. 2008. Eco-hydrological responses on dominated sand-fixing vegetations in the transitional zone from oasis to desert in the lower reaches of Shiyang River. PhD Dissertation. Beijing: Beijing Forestry University. (in Chinese)Google Scholar
- Yin K L. 1995. Tamarix spp.—The key species in the desert ecosystem. Arid Zone Research, 12(3): 43–47. (in Chinese)Google Scholar
- Yin L, Zhao L J, Ruan Y F, et al. 2012. Study of the replenishment sources of typical ecosystems water and dominant plant water in the lower reaches of the Heihe, China. Journal of Glaciology and Geocryology, 34(6): 1478–1486. (in Chinese)Google Scholar
- Yu T F, Feng Q, Si J H, et al. 2017. The contribution of hydraulic lift to evapotranspiration by Tamarix ramosissima Ledeb. in the lower Heihe River. Acta Ecologica Sinica, 37(18): 1–9. (in Chinese)Google Scholar
- Zhao J B, Ma Y D, Xing S H, et al. 2010. Study on moisture content in sand layers of Tengger Desert in Zhongwei, Ningxia. Journal of Mountain Science, 28(6): 653–659. (in Chinese)Google Scholar
- Zhao Y F, Kong F K, Xu Z H, et al. 2017. Floristic analysis on vegetation of Tamarix austromongolica community in Qinghai Province. Journal of Plant Resources & Environment, 26(2): 90–96. (in Chinese)Google Scholar
- Zhou C X, Sun Z Y, Yu S W, et al. 2011. Using D and 18O stable isotopes to determine the water sources of sand dune plants in Linze, middle reaches of Heihe River. Geological Science and Technology Information, 30(5): 103–109. (in Chinese)Google Scholar
- Zhu J F, Wang N A, Chen H B, et al. 2010. Study on the boundary and the area of Badain Jaran Desert based on remote sensing imagery. Progress in Geography, 29(9): 1087–1094. (in Chinese)Google Scholar