马占相思树干液流与光合有效辐射和水汽压亏缺间的时滞效应  

Time lag effect between stem sap flow and photosynthetically active radiation,vapor pressure deficit of Acacia mangium

作　　者：王华[1] 赵平[1] 蔡锡安[1] 马玲[1] 饶兴权[1] 曾小平[1] 

机构地区：[1]中国科学院华南植物园鹤山丘陵综合试验站

出　　处：《应用生态学报》2008年第2期225-230,共6页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重要方向项目(KSCX2-SW-133);国家自然科学基金项目(30428022,30270239,30770328);广东省自然科学基金资助项目(031265,07006917)

摘　　要：应用Granier热消散探针测定华南丘陵马占相思的树干液流,将液流与对应的光合有效辐射和水汽压亏缺数据列分别进行逐行错位分析和时间序列分析,探讨树干液流与蒸腾驱动因子之间的时滞效应,并对结果进行互相验证.结果表明:马占相思树木蒸腾主要驱动因子是光合有效辐射和水汽压亏缺,树干液流的变化更多地依赖光合有效辐射的变化,而且干季的依赖性比湿季更强;无论是干季还是湿季,树干液流都滞后于光合有效辐射,提前于水汽压亏缺;时滞效应季节差异显著;不同径级马占相思的时滞效应差异不显著;树高、胸径、冠幅并不能解释树干液流与光合有效辐射、水汽压亏缺之间的时滞效应;干季树干液流与水汽压亏缺之间的时滞效应与夜间水分补充量显著相关,湿季则相反.Based on the measurement of the stem sap flow of Acacia mangium with Granier＇ s thermal dissipation probe, and the cross-correlation and time serial analysis of the sap flow and corresponding photosynthetically active radiation and vapor pressure deficit, this paper studied the time lag effect between the stem sap flow of A. mangium and the driving factors of the tree canopy transpiration. The results indicated that the main driving factors of the transpiration were photosynthetically active radiation （PAR） and vapor pressure deficit （VPD）. Sap flux density （J,） was more dependent on PAR than on VPD, and the dependence was more significant in dry season than in wet season. Sap flow lagged behind PAR but advanced than VPD in both dry and wet seasons. The time lag did not show any significant variation across different size tree individuals, but showed signifi- cant variation in different seasons. Time lag effect was not correlated with tree height, diameter at the breast, and canopy size. The time lag between Js and VPD was significantly related to nighttime water recharge in dry season, but reversed in wet season.

关 键 词：马占相思 Granier热消散探针法 时滞 夜间水分补充 

分 类 号：Q945[生物学—植物学]