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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (3): 763-771.doi: 10.13287/j.1001-9332.201703.034

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Characteristics and affecting factors of sap flow density of Pinus tabuliformis and Hippophae rhamnoides in growing season in the hilly region of the Loess Plateau, China

WEN Jie1, CHEN Yun-ming2,3*,TANG Ya-kun2,3,WU Xu3, XIE Yu-li3,CUI Gao-yang3   

  1. 1College of Fores-try, Northwest A&F University, Yangling 712100, Shaanxi, China
    2Research Center of Institute of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling 712100, Shaanxi, China
    3Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China
  • Received:2016-07-26 Published:2017-03-18
  • Contact: *E-mail: ymchen@ms.iswc.ac.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41501576, 41371506), the China Special Fund for Meteorological Research in the Public Interest (Major Project) (GYHY2015060013), the Fundamental Research Funds for the Central Universities (Z109021606) and the National Key Research and Development Program of China (2016YFC0501703)

Abstract: The dynamic changes of sap flow density (Js) of Pinus tabuliformis and Hippophae rhamnoides in plantations from July to September in 2015 was monitored through thermal dissipation probe in the hilly region of the Loess Plateau. In addition, plant physiological characteristics were analyzed to determine the water use types of these two species. The results indicated that the daily changes of Js of P. tabuliformis and H. rhamnoides showed a single peak during both pre- and post-precipitation. The Js of P. tabuliformis in growing season (12.62 mL·m-2·s-1) was significantly higher than that of H. rhamnoides (2.60 mL·m-2·s-1). The Js of these two species were significantly positively correlated with photosynthetic active radiation, vapor pressure deficit, soil volume-tric water content (SWC). The Js of these two species were mainly influenced by meteorological factors during pre- and post-precipitation in both August and September. The contribution of SWC to Js of H. rhamnoides increased by 4.2% after precipitation in September, but the contribution of SWC to Js of P. tabuliformis decreased by 0.3% after precipitation in both August and September, respectively. Meanwhile, P. tabuliformis showed significantly higher water potential in midday leaf, but lower coefficient of variation (7.3%) than H. rhamnoides with the coefficient of variation of 11.7%. However, H. rhamnoides exhibited higher leaf stomatal conductance. Thus, P. tabuliformis and H. rhamnoides could be considered as isohydry and anisohydry species, respectively.

Key words: isohydry, Pinus tabuliformis, anisohydry, Hippophae rhamnoides., sap flow density