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当前位置: 首页 > 文章 > 液流径向变化对尾巨桉单株日蒸腾量估算的影响 应用生态学报 2017 (8) 2445-2451
Position: Home > Articles > Effect of sap flow radial variation on daily transpiration estimation of Eucalyptus urophylla×Eucalyptus grandis Chinese Journal of Applied Ecology 2017 (8) 2445-2451

液流径向变化对尾巨桉单株日蒸腾量估算的影响

作  者：
周翠鸣;顾大形;赵平;黄科朝;何文;姚月锋;朱丽薇;黄玉清
单  位：
广西壮族自治区中国科学院广西植物研究所广西喀斯特植物保育与恢复生态学重点实验室;中国科学院华南植物园广东省应用植物学重点实验室
关键词：
尾巨桉;液流速率;径向变化;日蒸腾量
摘  要：
采用Granier热扩散方法(TDP)测定了尾巨桉2个径向深度(0~2和2~4 cm)的液流速率,探讨液流径向变化对树木蒸腾估算产生的影响、不同个体大小的估算误差以及估算误差与光合有效辐射(PAR)和水汽压亏缺(VPD)的关系.结果表明:尾巨桉的日蒸腾量在单点径向深度0~2 cm条件下估算值最大,两点综合估算值次之,单点径向深度2~4 cm最小,单点径向0~2 cm和径向2~4 cm所得的日蒸腾量分别较两点综合估算值高估了32.9%和低估了58.7%;用单点径向0~2 cm估算蒸腾量时所产生的误差随胸径的递减而减少,胸径为17.7、12.9和9.8 cm的树木产生的估算误差分别为51.7%、33.0%、18.0%,而单点径向2~4 cm所产生的估算误差则没有明显的径级差异;PAR和VPD都与单点径向0~2 cm估算误差有较好的正相关性,相比较VPD而言,PAR与单点径向0~2 cm估算误差的相关性更好.相比传统的仅用单一深度液流速率估算单株蒸腾耗水量的方法,两点估算方法一定程度上提高了日蒸腾量计算的精度,为尾巨桉人工林森林耗水量估算提供了可靠依据.
译  名：
Effect of sap flow radial variation on daily transpiration estimation of Eucalyptus urophylla×Eucalyptus grandis
作  者：
ZHOU Cui-ming;GU Da-xing;ZHAO Ping;HUANG Ke-chao;HE Wen;YAO Yue-feng;ZHU Li-wei;HUANG Yu-qing;Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences;Guangdong Provincial Key Laboratory of Applied Botany,South China Botanical Garden,Chinese Academy of Sciences;
关键词：
Eucalyptus urophylla × Eucalyptus grandis;;sap flow velocity;;radial variation;;daily transpiration
摘  要：
The sap flow velocity of Eucalyptus urophylla × Eucalyptus grandis was measured at 0-2cm and 2-4 cm sapwood depths using the Granier-type thermal dissipation probe( TDP) method to determine the effect of sap flow radial variation on whole-tree daily transpiration estimation,the estimation errors of different diameters at breast height( DBH),and the relationships between the estimation errors and photosynthetically active radiation( PAR) and vapor pressure deficit( VPD).Results showed that the daily transpiration of E.urophylla × E.grandis estimating with one point sap flow velocity at 0-2 cm was the highest,followed by the two points estimated value obtained from0-2 cm and 2-4 cm,and that with one point sap flow velocity at 2-4 cm being the minimum.Compared to the two points estimated value,the sap flow velocity of 0-2 cm and 2-4 cm were overestimated by 32.9% and underestimated by 58.7%,respectively.The estimation error with one-point sap flow velocity of 0-2 cm decreased along with the decreasing DBH.The estimation errors were51.7%,33.0% and 18.0% at DBH 17.7,12.9 and 9.8 cm,respectively.The estimation error with the 2-4 cm sap flow velocity did not show significant difference among trees with different DBHs.There was a good positive correlation between estimation error and PAR and VPD when one-point sap flow velocity was used at 0-2 cm.Compared to the traditional method using only one point sap flow velocity,it was better to use multiple points estimate of sap flow velocity for a more accurate estimation of daily transpiration of E.urophylla × E.grandis.Our results provided a reliable estimate of water use in Eucalyptus plantation.

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