Chin J Plan Ecolo ›› 2015, Vol. 39 ›› Issue (12): 1176-1187.DOI: 10.17521/cjpe.2015.0114
• Orginal Article • Previous Articles Next Articles
WU Xu1, CHEN Yun-Ming2,3,*(), TANG Ya-Kun2,3
Online:
2015-12-01
Published:
2015-12-31
Contact:
Yun-Ming CHEN
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# Co-first authors
WU Xu,CHEN Yun-Ming,TANG Ya-Kun. Sap flow characteristics and its responses to precipitation in Robinia pseudoacacia and Platycladus orientalis plantations[J]. Chin J Plan Ecolo, 2015, 39(12): 1176-1187.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2015.0114
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 |
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.
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 |
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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