Chin J Plan Ecolo ›› 2015, Vol. 39 ›› Issue (12): 1176-1187.doi: 10.17521/cjpe.2015.0114

• Orginal Article • Previous Articles     Next Articles

Sap flow characteristics and its responses to precipitation in Robinia pseudoacacia and Platycladus orientalis plantations

WU Xu1, CHEN Yun-Ming2,3,*(), TANG Ya-Kun2,3   

  1. 1Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
    2State Key Laboratory of Soil Erosion and Dry-land Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
    and 3Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
  • Online:2015-12-31 Published:2015-12-01
  • Contact: Yun-Ming CHEN E-mail:ymchen@ms.iswc.ac.cn
  • About author:

    # Co-first authors

Abstract:

Aim In the loess hilly region, drought stress frequently occurs during the late spring and early summer as a result of insufficient water supply and asynchronous changes between temperature and precipitation. Our objective was to quantify the characteristics of water-consumption through transpirations and their responses to precipitation in the dominant plantations in this region. Methods Thermal dissipation probe (TDP) was used to measure the sap flow density (Fd) of Robinia pseudoacacia and Platycladus orientalis from April through October in 2009 in Ansai National Ecological Experimental Station. Environmental variables, including meteorological factors and soil water content, were simultaneously measured. Important findings The diurnal variation of Fd exhibited a single-peak curve during the growing season of R. pseudoacacia and P. orientalis. The maximum Fd was three times greater in R. pseudoacacia (0.12068 m3·m-2·h-1) than that in P. orientalis (0.03737 m3·m-2·h-1). Except in the rapid-growth season (July to August), the Fd of these two species during the post-precipitation period were significantly higher than that during the pre-precipitation period. The Fd of P. orientalis and R. pseudoacacia was well fitted with transpiration (VT), an integrated index calculated from both vapor pressure deficit (VPD) and solar radiation (Rs), using an exponential saturation function. Generally, Fd increased in response to rising VT, while these values tended to be stable when VT reached about 50 kPa (W·m-2)1/2. Furthermore, R. pseudoacacia showed more sensitive to precipitation (p < 0.001) than P. orientalis, according to different hydraulic conductance model coefficients (fitting parameter b) between pre- and post-precipitation periods. Therefore, R. pseudoacacia could be considered as a precipitation-sensitive species, while P. orientalisasa precipitation-insensitive species. Through analyzing the different responses of plantation species to precipitation in the loess hilly region, this study provides a scientific basis for the local plantation management from the aspect of tree water use during ecological restoration.

Key words: Robinia pseudoacacia, Platycladus orientalis, sap flow, environmental parameters, water use

Table 1

Stand structural characteristics of two plantations"

树种
Species
样木序号
Sample tree No.
林龄
Stand age (a)
树高
Tree height (m)
胸径/地径
DBH/DGH (cm)
边材厚度
Sapwood width (cm)
刺槐 Robinia pseudoacacia 1
2
3
4
41
41
41
41
13.5
13.0
13.0
14.0
20.5
17.3
18.0
24.0
1.2
1.0
1.1
1.3
侧柏 Platycladus orientalis 1
2
3
4
27
27
27
27
5.2
5.3
4.0
4.6
8.7
9.6
9.5
10.2
2.9
3.2
3.1
3.3

Fig. 1

Changes in precipitation and soil volumetric moisture content in the studied plots during the growing season. The marked time of three rectangular boxes on X-axis are the study periods with the center of three precipitation events during the growing season on May 27 to 28 (30 mm), July 26 to 27 (7 mm) and September18 to 20 (9.2 mm). The soil volumetric moisture content data are averages in the depths of 0-200 cm."

Fig. 2

Soil volumetric moisture content in the Robinia pseudoacacia (A-C) and Platycladus orientalis (D-F) plantation in pre- and post-precipitation conditions, respectively (mean ± SE)."

Fig. 3

Daily sum of solar radiation (Rs) and daytime mean vapor pressure deficit (VPD) in the two plantations measured on pre- and post-precipitation conditions during the selected periods, respectively. The study periods which with the center of three precipitation events in different growth periods were separated with dotted lines."

Fig. 4

Changes in sap flow density in Robinia pseudoacacia (A) and Platycladus orientalis (B) measured on pre- and post-precipitation conditions, respectively, during the different growth period. The different growth periods in growing season were separated with dotted lines."

Fig. 5

Frequency of sap flow density (Fd) peak time of Robinia pseudoacacia (A) and Platycladus orientalis (B) measured on pre- and post-precipitation conditions, respectively, during the different growth periods."

Fig. 6

Sap flow density (Fd) of Robinia pseudoacacia (A) and Platycladus orientalis (B) measured on pre- and post-precipita- tion conditions, respectively, during the different growth periods. Capital letters indicated the significant difference between the pre- and post-precipitation at 0.05 levels, and small letters indicated the significant difference among months in pre- or post-precipitation at 0.05 levels."

Fig. 7

The relationship between sap flow density (Fd) and transpiration (VT) of Robinia pseudoacacia (A-C) and Platycladus orientalis (D-F) measured on pre (●) and post-precipitation (○) condition, respectively, during the different growth periods."

Table 2

Sap flow density (Fd) in relation to transpiration (VT) of pre- and post-precipitation days in different growth periods during the growing season"

树种
Species
月份
Month
降水前
Pre-precipitation
降水后
Post-precipitation
拟合参数检验
Difference between coefficients
刺槐 Robinia pseudoacacia 4-6月
Apr.-June
a = 0.07597
b = 0.01751
R2 = 0.93595
p < 0.001
a = 0.08689
b = 0.02463
R2 = 0.90636
p < 0.001
p < 0.001
p < 0.001
7-8月
July-Aug.
a = 0.10655
b = 0.06804
R2 = 0.85815
p < 0.001
a = 0.10735
b = 0.07429
R2 = 0.92151
p < 0.001
p = 0.064
p = 0.064
9-10月
Sept.-Oct.
a = 0.0665
b = 0.08483
R2 = 0.8779
p < 0.001
a = 0.10192
b = 0.06069
R2 = 0.67764
p < 0.001
p < 0.001
p < 0.001
侧柏 Platycladus orientalis
4-6月
Apr.-June
a = 0.01478
b = 0.01808
R2 = 0.27474
p < 0.001
a = 0.01916
b = 0.02917
R2 =0.39464
p < 0.001
p < 0.01
p < 0.01
7-8月
July-Aug.
a = 0.02437
b = 0.05265
R2 = 0.64406
p < 0.001
a = 0.02851
b =0.05112
R2 = 0.83689
p < 0.001
p < 0.05
p < 0.05
9-10月
Sept.-Oct.
a = 0.02438
b = 0.01681
R2 = 0.81975
p < 0.001
a = 0.03512
b = 0.02075
R2 = 0.57574
p < 0.001
p < 0.001
p < 0.001
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