生态学杂志2018，Vol.37Issue(9)：2862-2868,7.DOI:10.13292/j.1000-4890.201809.032
宁夏河东沙区侧柏冠层气孔导度对环境因子的响应及其模拟
Responses and modeling of canopy stomatal conductance of Platycladus orientalis to environmental factors in Hedong sandy land,Ningxia
摘要
Abstract
To understand the responses of forest canopy stomatal conductance to environmental factors and the underlying mechanism of canopy stomatal conductance controlling forest transpiration, the Granier thermal dissipation probe technology was used to monitor the sap flow of Platycladus orientalis,a typical tree species of protective forest in Hedong sandy land of Ningxia,from July to September. The microclimate variables were synchronously monitored. Based on sap flow, the continuous canopy stomatal conductance ( gc ) was calculated by Penman-Monteith equation. An improved Jarvis-Stewart stomatal model was used for simulating the changes of gc . The results showed that the environmental variables such as saturated vapor pressure deficit ( VPD),air temperature ( Ta ),relative humidity ( RH) and solar radiation ( Rs ) were significantly correlated with gc of P. orientalis ( P＜0.01) . The magnitude of the influence of those factors on gc were Ta ＞Rs＞VPD＞RH. In sunny days,the relationships between gc and VPD and between gc and Ta were characterized by a hysteresis loop,with the response path being different from the rising stage to descending stage. Moreover,those relationships showed different response patterns at different time. The Jarvis-Stewart model performed better in simulating the responses of canopy stomatal conductance to environmental factors Rs,VPD,and Ta . Results from cross validation showed that optimal parameter calibration of this model explained 84.4％ of the total variation.关键词
树干液流/冠层气孔导度/磁滞回环/Jarvis-Stewart模型/侧柏Key words
sap flow/canopy stomatal conductance/hysteresis loop/Jarvis-Stewart model/Platycladus orientalis引用本文复制引用
韩磊,何俊,齐拓野,田佳,孙兆军,展秀丽..宁夏河东沙区侧柏冠层气孔导度对环境因子的响应及其模拟[J].生态学杂志,2018,37(9):2862-2868,7.基金项目
国家自然科学基金项目( 31460220、31760236、31560232) 资助. （ 31460220、31760236、31560232）
