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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。
Understanding the water use characteristics of Magnoliaceae plants plays an important role in improving the success rate of ex-situ conservation. The sap flow of two magnoliaceous plants, Alcimandra cathcartii and Michelia macclurei, was determined by TDP probe (heat dissipation probe), and the relationship between sap flow and environmental factors was analyzed. The results showed that the diurnal variation of transpiration of whole tree was unimodal, but there was still fluid flow at night. In January, the peak of liquid flux (F’d) per unit area of Cymbidium pumilum [(25.00 ± 7.35 ) g · m-2 · s-1] was significantly higher than that of drunk ([6.35 ± 1.46] g · m-2 · s-1] (6: 00-18: 00) was also significantly higher than that of drunkard. The responses of the two tree species to environmental factors varied with seasons, and in the dry season (October and January) The responses were more obvious than those in the rainy season (April and July). The daily transpiration water consumption per unit area could effectively distinguish the water consumption differences among individuals or species. Physiological water consumption of P. longibracteata was smoother than that of drunkard, Should pay attention to Macrophylla macrophylla demand for greater physiological characteristics of water.