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浙江大学学报（农业与生命科学版）
浙江大学学报(农业与生命科学版)  2013, Vol. 39 Issue (5): 575-581    DOI: 10.3785/j.issn.1008-9209.2013.02.061
资源与环境科学     
江西退化红壤区枫香液流特征及其与气象因子的关系
涂洁1*， 裴青宝1， 王辉民2， 廖迎春1， 李燕燕1
（1.南昌工程学院生态与环境科学研究所，南昌330099；
2.中国科学院地理科学与资源研究所，生态系统网络观测与模拟重点实验室千烟洲生态站，北京100101）
Sap flow characteristics of Liquidambar formosana Hance and its relationships with meteorological factors in Jiangxi degraded red soil region
TU Jie1*, PEI Qingbao1, WANG  Huimin2, LIAO  Yingchun1, LI Yanyan1
(1.Research Institute of Ecology & Environmental Sciences, Nanchang Institute of Technology, Nanchang 330099, China; 2.Qianyanzhou Ecological Station Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research， Chinese Academy of Sciences, Beijing 100101,China)
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摘要： 采用Granier热扩散式探针和自动气象站对江西退化红壤区枫香树干液流与气象因子进行同步观测，建立描述树干液流速率与气象因子相关关系的多元线性回归模型，为枫香人工林的可持续经营和林地水资源的有效管理提供理论依据。结果表明：1）晴天液流为典型的宽峰型变化，呈明显的季节变化规律，表现为开始启动、到达峰值时间和保持较大速率时间的不同。不同月份平均液流速率（v, cm/s）大小依次为7月（0.002131）>6月（0.001937）>8月（0.001932）>9月（0.001861）>5月（0.001593）>4月（0.001423）>10月（0.001123）；2）雨天枫香液流明显低于同时期晴天液流水平，但液流变化节律因降雨时段和降雨强度不同存在差异；3）液流速率对平均净辐射的响应存在逆时针方向1 h的时滞，对空气温度和相对湿度的响应存在顺时针方向1.5 h的时滞。在考虑与不考虑时滞效应2种情况下，与枫香液流速率相关性从大到小的气象因子分别依次为：平均净辐射（0.398）>相对湿度（-0.258）>空气温度（0.231）；平均净辐射（0.595）>相对湿度（-0.401）>空气温度（0.028）。液流速率与气象因子的多元线性回归方程拟合效果良好，决定系数R2均达到0.85；所有回归方程和回归系数的相关性检验均达到极显著水平。
Abstract: Liquidambar formosana  Hance  is one of the excellent pioneer tree species, which has been widely used in the barren soils in subtropical area of China. L. formosana  plantations  have huge ecological benefits such as reduction of canopy leaching, remediation of heavy metals pollution and hydrological effects, while at the same time they also consume large amount of water to maintain growth. Therefore, quantitative research on the water consumption characteristics by transpiration of the pioneer plantations has become a hotspot in the field of tree physiological ecology in recent years. In this study, sap flow velocity (v, cm/s) and meteorological factors were simultaneously observed using Granier’s thermal dissipation probe and automatic weather station in a degraded red soil region in Jiangxi Province. Multivariate linear models were established to describe the relationships between sap flow velocity and relative meteorological factors. The models could not only reveal sap flow characteristics of L. formosana and its relationships with meteorological factors, but also estimate the whole tree transpiration according to meteorological data. The ultimate aim of this study was to provide theoretical basis for sustainable management strategies of L. formosana  plantations and associated water resource. The results were as follows: 1) In sunny days, diurnal variations of sap flow displayed wide-peaked curves. Obvious seasonal dynamics was found mainly because of different time points in the time of starting, peak and the lasting time at the relatively high level of sap flow velocity. The starting time was  earlier in June and July but latest in October. Sap flow velocity peaked earliest in July and kept sap flow rate of about 0.005 cm/s for up to 8 hours while peaked latest in October and kept sap flow rate of 0.002 cm/s for only 4 hours. The average monthly sap flow velocity followed  the order of July (0.002131) >June (0.001937)>Aug. (0.001932)>Sept.(0.001861)>May (0.001593)>Apr.(0.001423)> Oct.(0.001123). 2) In rainy days, sap flow velocity was much lower than that in sunny days based on the same time point. The diurnal changes of sap flow exhibited remarkable differences due to the time and intensity of precipitation. In the rainfall condition, no obvious initiation except for small fluctuations of sap flow was observed due to high relative humidity and low solar radiation. Diurnal variations of sap flow would not be disturbed when precipitation happened before initiation or after termination of sap flow activity. 3) About 1 hour time lag existed between sap flow and average net radiation (ANR) in clockwise direction and there were 1.5 hours time lag between sap flow and air temperature (Ta) as well as relative humidity (RH) in anti-clockwise direction. In the cases the time lag effect contained and not, the correlation strengths  between sap flow velocity and meteorological factors were ANR (0.398)>RH (-0.258)>Ta (0.231),  and ANR (0.595)>RH (-0.401)>Ta (0.028), respectively. Multivariate linear models indicated good fitting between sap flow velocity and meteorological factors,  and the determination coefficients (R2) between three meteorological factors and sap flow velocity reached 0.85. The regression models and all  parameters were significant at the level of  P＜0.01 in two cases.
出版日期: 2013-09-20
CLC:  S 718.5  
基金资助:

国家自然科学基金资助项目（31260172；31160153）；国家重点基础研究发展计划（973计划）资助项目（2002CB4125）。
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涂洁1*
裴青宝1
王辉民2
廖迎春1
李燕燕1

引用本文:

涂洁1*， 裴青宝1， 王辉民2， 廖迎春1， 李燕燕1. 江西退化红壤区枫香液流特征及其与气象因子的关系[J]. 浙江大学学报(农业与生命科学版), 2013, 39(5): 575-581.

TU Jie1*, PEI Qingbao1, WANG Huimin2, LIAO Yingchun1, LI Yanyan1. Sap flow characteristics of Liquidambar formosana Hance and its relationships with meteorological factors in Jiangxi degraded red soil region. Journal of Zhejiang University (Agriculture and Life Sciences), 2013, 39(5): 575-581.

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http://www.zjujournals.com/agr/CN/10.3785/j.issn.1008-9209.2013.02.061    或    http://www.zjujournals.com/agr/CN/Y2013/V39/I5/575

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