Chin J Plan Ecolo ›› 2018, Vol. 42 ›› Issue (2): 195-201.doi: 10.17521/cjpe.2017.0082

• Research Articles • Previous Articles     Next Articles

Estimating whole-tree water use of Picea crassifolia based on heat ratio method

YANG Jun-Jun1,*(),FENG Jian-Min1,HE Zhi-Bin2   

  1. 1College of Resource & Environment and Historical Culture, Xianyang Normal University, Xianyang, Shaanxi 712000, China;

    2Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • Online:2018-04-16 Published:2018-02-20
  • Contact: Jun-Jun YANG E-mail:junjun_yang@126.com
  • Supported by:
    Supported by the National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2014BAL01B03);the National Natural Science Foundation of China(41522102);the Shaanxi Province Key Science and Technology Innovation Team Project(2016KCT-23)

Abstract:

Aims Accurate estimation of forest transpiration in the upper reach of the watershed is vital to the management of water resources in arid region. The objective of this study was to provide a systematic method for calculating the forest evapotranspiration at different scales.

Methods In this study we measured the whole-tree transpiration using the heat ratio method technology and estimated the stand- and catchment-transpiration employing the upscaling methods.

Important findings The main results and conclusions were as follows: First, the diameter at breast height (DBH) exhibited significant correlations with sapwood area, and the correlation was characterized by the exponential function (R2=0.94,p<0.001).Second, in the weighted calculation of sap-flux measurements based on two-point thermocouples and sapwood area of Picea crassifolia,the correction coefficient between the true value and the observation value was 1.09. Third, when calculating sap-fluxes based on the average-sap-flux and total sapwood area of stand-transpiration, ignoring sap-flux velocity heterogeneities of trees led to transpiration rates being overestimated or underestimated by nearly one third; Fourth, the stand-transpiration estimation method based on the relationship between DBH and sap-flux can give a more reasonable prediction ofPicea crassifolia transpiration. The results indicated that the probe-based sap-flux measuring technology would perform well for the transpiration scaling-up calculation at the catchment with only one single tree species, and the calculation methodology can be applied to other watersheds.

Key words: transpiration, upscaling, heat ratio method, Picea crassifolia

Table 1

Biometric and physiological parameters of sap flow measurements for Picea crassifolia"

样树编号
Sample tree number
树高
Tree height
胸径
Diameter at breast height
冠幅宽度
Crown width
冠幅投影面积
Crown projection area
树皮厚度
Bark depth
心材半径
Heartwood radius
边材厚度
Sapwood width
边材面积
Sapwood area
(m)(cm)(m)(m2)(cm)(mm)(mm)(mm2)
116.122.24.2414.070.66737.520β327.0
214.216.04.2914.160.64232.111β694.6
313.015.53.3810.350.64031.711β090.7
411.311.42.688.130.62228.66β599.9
55.56.22.016.340.3820.52β286.3
65.35.01.605.500.3814.51β343.8
74.25.12.266.910.3815.01β413.7
83.84.12.116.550.3810.0785.4

Fig. 1

Frequency percentage of diameter at breast height at investigation stand and the diameter of sample trees."

Fig. 2

Relationship between diameter at breast height (x) and sapwood width (y) for Picea crassifolia."

Fig. 3

Sap flow variation patterns of sapwood width for Qinghai spruce. Total transpiration was the transpiration of sample trees between July 23th and October 25th in 2015."

Table 2

The daily mean whole-tree water use in each month in the observational period (mean ± SD)(kg·d-1)"

月份 Month样树编号 Sample tree number
1345678
7月 July68.67 ± 6.4929.97 ± 4.1917.89 ± 2.245.37 ± 0.337.54 ± 0.873.81 ± 0.432.78 ± 0.11
8月 August44.55 ± 9.0914.77 ± 4.419.74 ± 2.572.93 ± 0.894.36 ± 1.271.40 ± 0.531.81 ± 0.42
9月 September34.83 ± 9.509.98 ± 3.296.88 ± 3.011.72 ± 0.722.56 ± 1.290.53 ± 0.090.97 ± 0.28
10月 October25.81 ± 6.686.99 ± 1.433.16 ± 1.200.95 ± 0.311.64 ± 0.680.41 ± 0.030.79 ± 0.18

Fig. 4

Stand sap-flow pattern and tree sap-flow patterns on seven measured trees during the observational period (between July 23th and October 25th in 2015)."

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