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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (5): 195-203.DOI: 10.7522/j.issn.1000-694X.2022.00039

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The characteristics of branch nocturnal sap flow and its environmental driving mechanism of Haloxylon ammodendron artificial shrub in the Ulan Buh Desert

Yali Liu1,2(), Jianhua Bai1,2, Wei Xiong1,2(), Yuqing Han1,2, Honglin Lian5, Hao Guo1,2, Zhiming Xin3,4, Xiangjie Liu3,4, Huaiyuan Liu3,4   

  1. 1.Institute of Ecological Conservation and Restoration /, Chinese Academy of Forestry,Beijing 100091,China
    2.Institute of Desertification Studies /, Chinese Academy of Forestry,Beijing 100091,China
    3.Experimental Center of Desert Forestry /, Chinese Academy of Forestry,Beijing 100091,China
    4.Dengkou Desert Ecosystem National Observation Research Station, Chinese Academy of Forestry,Beijing 100091,China
    5.Horqin Zuoyi Middle Banner Water Affairs Bureau,Horqin Zuoyi Middle Banner 029300,Inner Mongolia,China
  • Received:2022-01-08 Revised:2022-03-17 Online:2022-09-20 Published:2022-09-22
  • Contact: Wei Xiong

Abstract:

Nocturnal sap flow (Qn) refers to the sap flux through roots, stems and leaves during the nighttime, which has an eco-physiologically significance for understanding trunk water transport, storage and canopy transpiration of the trees. In this study, the Granier's thermal diffusion probe was used to measure the sap flow of Haloxylon ammodendron, a common sand-fixing shrub species in the Ulan Buh Desert. Combined the simultaneous monitoring of meteorological factors including atmospheric temperature (T), relative air humidity (RH), rainfall (P), and wind speed (WS), as well as soil moisture, the underlying mechanism of environmental driver of sap flow of this species was analyzed from June to October 2020. The results showed that: (1) The sap flux density (SFD) showed an cycled daily variation. Specifically, the pattern of SFD showed a "unimodal" or "bimodal" curve in the daytime, it changed from 0.03 to 0.18 g·cm-2·min-1, while the SFD changed stably and were a relatively low ranged from 0.04 to 0.08 g·cm-2·min-1 at nighttime. (2) The average of Qn were 0.57±0.38, 0.51±0.37, 0.50±0.34, 0.55±0.32, and 0.37±0.18 kg·d-1, respectively, from June to October; which accounted for 23.29%, 24.07%, 26.76%, 31.26%, and 30.27% of daily sap flow, respectively, suggesting that nocturnal sap flow is an essential components of daily water use of H. ammodendron shrub. (3) The Qn was positively correlated with TWS and VPDP<0.05), while it was negatively correlated with RH(P<0.05). (4) Qn increased with increasing relative extractable soil water (REW) during the study period (P<0.05). Our results will be benefit to accurately estimate daily water use of H. ammodendron shrub and provides a theoretical basis for the rational management of artificial forests in the Ulan Buh Desert.

Key words: Ulan Buh Desert, nocturnal sap flux, thermal dissipation probe, environmental factors, relative extractable soil water (REW

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