植物生态学报 ›› 2010, Vol. 34 ›› Issue (4): 469-476.DOI: 10.3773/j.issn.1005-264x.2010.04.013
• 简报 • 上一篇
收稿日期:
2009-04-20
接受日期:
2009-10-30
出版日期:
2010-04-20
发布日期:
2010-04-01
通讯作者:
陈云明
作者简介:
** E-mail: ymchen@ms.iswc.ac.cn
WU Fang1,*(), CHEN Yun-Ming1,2,**(
), YU Zhan-Hui3
Received:
2009-04-20
Accepted:
2009-10-30
Online:
2010-04-20
Published:
2010-04-01
Contact:
CHEN Yun-Ming
摘要:
通过研究树干液流速率与气象因子的关系, 可以定量地分析树木生长与群落蒸腾耗水的相互关系, 揭示黄土高原半干旱区刺槐水分利用动态及其适应环境因子的内在机理, 为当地生态环境建设提供理论依据。应用热扩散式树干茎流计(TDP)于2008年7月1日至7月26日, 在黄土高原半干旱区安塞县对刺槐(Robinia pseudoacacia)人工林生长盛期树干液流速率进行了连续测定, 并对周围气象、土壤水分等指标进行了同步测定。刺槐生长盛期树干液流速率晴天日变化呈宽峰形曲线, 在测量时期液流速率日平均值为0.001 33 cm·s-1; 刺槐树干单位边材面积的液流速率与光合有效辐射、大气温度、水汽压差呈极显著正相关关系, 与相对湿度呈负相关关系。其相关程度绝对值顺序为光合有效辐射>大气温度>水汽压差>相对湿度>风速; 刺槐边材面积与胸径之间存在着显著的线性相关关系, 相关系数为0.878, 单位边材面积的液流速率随树干胸径的增大而减小。
吴芳, 陈云明, 于占辉. 黄土高原半干旱区刺槐生长盛期树干液流动态. 植物生态学报, 2010, 34(4): 469-476. DOI: 10.3773/j.issn.1005-264x.2010.04.013
WU Fang, CHEN Yun-Ming, YU Zhan-Hui. Growing season sap-flow dynamics of Robinia pseudoacacia plantation in the semi-arid region of Loess Plateau, China. Chinese Journal of Plant Ecology, 2010, 34(4): 469-476. DOI: 10.3773/j.issn.1005-264x.2010.04.013
样木序号 Sample tree No. | 林龄 Tree age (a) | 树高 The height (m) | 胸径(去皮) DBH (without bark) (cm) | 边材厚度 Sapwood width (cm) | 边材面积 Sapwood area (cm2) |
---|---|---|---|---|---|
1 | 40 | 13.5 | 20.5 | 1.2 | 72.76 |
2 | 40 | 13.0 | 17.3 | 1.0 | 51.21 |
3 | 40 | 13.0 | 18.0 | 1.1 | 58.40 |
4 | 40 | 14.0 | 24.0 | 1.3 | 93.27 |
表1 被测样木基本参数
Table 1 Basic parameters of samples
样木序号 Sample tree No. | 林龄 Tree age (a) | 树高 The height (m) | 胸径(去皮) DBH (without bark) (cm) | 边材厚度 Sapwood width (cm) | 边材面积 Sapwood area (cm2) |
---|---|---|---|---|---|
1 | 40 | 13.5 | 20.5 | 1.2 | 72.76 |
2 | 40 | 13.0 | 17.3 | 1.0 | 51.21 |
3 | 40 | 13.0 | 18.0 | 1.1 | 58.40 |
4 | 40 | 14.0 | 24.0 | 1.3 | 93.27 |
图3 刺槐生长盛期单位边材面积的液流速率和气象因子的变化。
Fig. 3 Changes of sap flows per unit sapwood area and climatic factors of Robinia pseudoacacia. PAR, photosynthetic aetive radiation; VPD, water vapor pressure deficit.
样木序号 Sample tree No. | 光合有效辐射 PAR (MJ·m-2) | 大气温度 Air temperature (°C) | 水汽压差 VPD (Pa) | 相对湿度 Relative humidity (%) | 风速 Wind speed (m·s-1) |
---|---|---|---|---|---|
1 | 0.86** | 0.67** | 0.57** | -0.54** | 0.43* |
2 | 0.87** | 0.74** | 0.64** | -0.61** | 0.46* |
3 | 0.80** | 0.69** | 0.57** | -0.55** | 0.37* |
4 | 0.86** | 0.72** | 0.60** | -0.57** | 0.42* |
表2 刺槐生长盛期单位边材面积的树干液流速率与气象因子的Pearson相关系数
Table 2 Pearson correlation coefficient of tree sap flow per unit sapwood area to climatic drivers
样木序号 Sample tree No. | 光合有效辐射 PAR (MJ·m-2) | 大气温度 Air temperature (°C) | 水汽压差 VPD (Pa) | 相对湿度 Relative humidity (%) | 风速 Wind speed (m·s-1) |
---|---|---|---|---|---|
1 | 0.86** | 0.67** | 0.57** | -0.54** | 0.43* |
2 | 0.87** | 0.74** | 0.64** | -0.61** | 0.46* |
3 | 0.80** | 0.69** | 0.57** | -0.55** | 0.37* |
4 | 0.86** | 0.72** | 0.60** | -0.57** | 0.42* |
样木序号 Sample tree No. | 回归方程 Regression equation | R2 | 自由度 df | p |
---|---|---|---|---|
1 | Vs1 = 1.96 × 10-6PAR - 1.06 × 10-6VPD - 2.35 × 10-5H | 0.80 | 623 | 0.000 |
2 | Vs2 = 1.24 × 10-6PAR - 5.81 × 10-7VPD - 1.24 × 10-5H+7.52 × 10-5vw - 0.001 | 0.84 | 623 | 0.000 |
3 | Vs3 = 2.21 × 10-6PAR - 2.11 × 10-7VPD - 4.51 × 10-5H - 0.001 | 0.75 | 623 | 0.000 |
4 | Vs4 = 1.66 × 10-6PAR - 1.38 × 10-7VPD - 3.33 × 10-5H | 0.84 | 623 | 0.000 |
表3 刺槐生长盛期单位边材面积的树干液流速率与气象因子的多元回归模型
Table 3 Multivariable regression models of sap flow velocity per unit sapwood area and factors
样木序号 Sample tree No. | 回归方程 Regression equation | R2 | 自由度 df | p |
---|---|---|---|---|
1 | Vs1 = 1.96 × 10-6PAR - 1.06 × 10-6VPD - 2.35 × 10-5H | 0.80 | 623 | 0.000 |
2 | Vs2 = 1.24 × 10-6PAR - 5.81 × 10-7VPD - 1.24 × 10-5H+7.52 × 10-5vw - 0.001 | 0.84 | 623 | 0.000 |
3 | Vs3 = 2.21 × 10-6PAR - 2.11 × 10-7VPD - 4.51 × 10-5H - 0.001 | 0.75 | 623 | 0.000 |
4 | Vs4 = 1.66 × 10-6PAR - 1.38 × 10-7VPD - 3.33 × 10-5H | 0.84 | 623 | 0.000 |
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