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当前位置: 首页 > 文章 > 两种木兰科植物的树干液流特征及其与环境因子的关系 生态学杂志 2012,31 (9) 2163-2169
Position: Home > Articles > Dynamics of xylem sap flow of two Magnoliaceae tree species in relation to environmental factors Chinese Journal of Ecology 2012,31 (9) 2163-2169

两种木兰科植物的树干液流特征及其与环境因子的关系

作  者：
蔡锡安;赵平;曾小平;朱丽薇;邹绿柳;梅婷婷;余孟好
单  位：
中国科学院退化生态系统植被恢复与管理重点实验室;中国科学院华南植物园
关键词：
液流通量;蒸腾耗水量;长蕊木兰;醉香含笑
摘  要：
了解木兰科植物的水分利用特点对提高其迁地保护的成功率具有重要作用。利用TDP探针(热消散探针)测定2种木兰科植物长蕊木兰(Alcimandra cathcartii)和醉香含笑(Michelia macclurei)的树干液流,分析树干液流与环境因子的关系。结果表明:2树种整树蒸腾的日变化均为单峰格型,但夜间仍有液流发生;在1月长蕊木兰单位断面积液流通量(F'd)日峰值[(25.00±7.35)g·m-2·s-1]明显比醉香含笑高[(6.35±1.46)g·m-2·s-1],在7月和1月长蕊木兰的F'd日平均值(6:00-18:00)也明显高于醉香含笑;2树种日蒸腾耗水量对环境因子的响应随季节变化而异,在干季(10月和1月)2树种对环境因子的响应比雨季(4月和7月)更明显;单位断面积日蒸腾耗水量可以有效区分个体间或种间的耗水差异;长蕊木兰的生理耗水量比醉香含笑大,在迁地保护时应注意长蕊木兰对水分需求较大的生理特征。
译  名：
Dynamics of xylem sap flow of two Magnoliaceae tree species in relation to environmental factors
作  者：
CAI Xi-an,ZHAO Ping,ZENG Xiao-ping,ZHU Li-wei,ZOU Lü-liu,MEI Ting-ting,YU Meng-hao(Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510160,China)
关键词：
sap flux density;water consumption for transpiration;Alcimandra cathcartii;Michelia macclurei.
摘  要：
To understand the water use characteristics of Magnoliaceae is of significance to improve its survival rate in ex-situ conservation.By using thermal dissipation probe,this paper studied the dynamics of the diurnal and seasonal sap flow densities of Alcimandra cathcartii and Michelia macclurei as well as the relationships between the dynamics and environmental factors in Guangzhou of South China.A single peak pattern was observed in the diurnal variation of the transpiration of the two species,but there was still a visible sap flow after sunset.In January 2009,the daytime maximum sap flux density per unit basal area(F'd) of A.cathcartii(25.00±7.35 g·m-2·s-1) was obviously higher than that of M.macclurei(6.35±1.46 g·m-2·s-1);in July 2008 and January 2009,the daytime mean F'd(6:00-18:00) of A.cathcartii was also obviously higher than that of M.macclurei.Partial correlation analysis indicated that the responses of the transpiration of the two species to environmental factors varied with seasons,being stronger in dry season(October and January) than in wet season(April and July).The whole-day transpiration per unit area at breast height was an effective indicator to reveal the differences in the diurnal water consumption for transpiration among the individuals and the tree species.The water consumption of A.cathcartii was greater than that of M.macclurei,and thus,more attention should be paid to A.cathcartii in its ex-situ conservation because of its high physiological demand for water.

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