JOURNAL OF NATURAL RESOURCES ›› 2016, Vol. 31 ›› Issue (3): 477-487.doi: 10.11849/zrzyxb.20150190

• Resource Evaluation • Previous Articles     Next Articles

Water Use Patterns of Two Typical Plants Based on Hydrogen and Oxygen Stable Isotopes at Dumping Site in the Opencast Coal Mining Area of Heidaigou

YANG Guo-min1, WANG Li1, 2   

  1. 1. College of Resources and Environment, Northwest A&F University, Yangling 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & Ministry of Water Resources, Yangling 712100, China
  • Received:2015-02-27 Online:2016-03-15 Published:2016-03-15
  • Supported by:
    "West-Action" Plan of the CAS, No.KZCX2-XB3-13; Program for New Century Excellent Talents in University, No.NCET-13-0484

Abstract: The stable isotope tracer technique was used to analyze the water sources and their seasonal changes of two plants (Populus simonii and Hippophae rhamnoides) with different life forms, and IsoSource Model was used to determine the probable contribution of certain soil-layer water source to total water uptake of plants. The result showed that δD and δ18Ο in rainfall water are in significantly negative correlation with the amount of precipitation, and there are obvious seasonal variation of δD (δ18Ο) values. In the dry season (March-June), hydrogen isotopic composition is enriched and the value of δD (δ18Ο) is higher; in the wet reason ( July-September) when rainfall events are frequent, the δD (δ18Ο) value in rainfall water deplete. In the dry season, Populus simonii uses soil water largely from the 10-150 cm layer, 25.6% of which is from the 100-150 cm layer. Hippophae rhamnoides uses soil water from all the soil layer (0-150 cm), 26.5% of which is from the surface layer (0-10 cm). Populus simonii does not used soil water from the 0-10 cm layer that avoids the inter-specific competition with Hippophae rhamnoide. In the wet season, two species both absorb water from shallow layers (0-60 cm). Populus simonii uses more than 70.9% of water from the 0-60 cm layer, and Hippophae rhamnoides uses more than 73.5% of water from the 30-60 cm layer. These findings indicated that two species utilize rationally the limited soil water in dry season by the different strategies, and use preferentially the shallow soil water when the soil water supply is adequate in wet season, which makes it much easier for them to be adaptive to the fragile ecological system in opencast coal mining area. The research will be useful for vegetation reconstruction in the opencast coal mining area.

CLC Number: 

  • S152.7