The sap flow of six tree species and stand water use of a mangrove forest in Hainan, China
The sap flow of six tree species and stand water use of a mangrove forest in Hainan, China
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海南红树林六种树种的液流及静水利用
DOI：
10.1016/j.gecco.2020.e01233
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发表时间：
2020-12-01
影响因子：
4
通讯作者：
Cao, Kun-Fang
中科院分区：
文献类型：
--
作者：
Leng, Bing;Cao, Kun-Fang
红树林在沿海盐水环境中生长，对林木的用水和红树林的调节机制知之甚少，尤其是在东部红树林集团中。我们在中国海南岛的热带红树林中测量了两年的六种树种的木聚糖流量密度（SFD），该树种处于季风气候下。在春季和夏季，在所有六个物种中都观察到双峰每日SFD模式。在冬季和春季，所有物种的SAP流量都被抑制了。每棵树的每年用水与直径在乳房高度（DBH）（R-2 1/4 0.81-0.89，p <0.05）之间呈正相关。通过从各个树木扩展，我们发现两个红树林地块的S值在两个研究年之间的269.19至357.27 mm y（-1）不等，占年降雨量的18-22％。这些S值类似于其他红树林和热带森林的价值，具有相似的基础区域。在所有物种的1 kPa VPD处，对LN VPD（蒸气压力缺陷）对LN VPD（蒸气压力缺陷）的灵敏度（MC）密切相关。 MC和GCREF之间的斜率值将六个物种分为两组，这表明Bruguiera sexangula，Rhizophora apiculata和Sonneratia alba是等等的，excoecaria agallocha，B。S。 var。 Rhymchopetala和xylocarpus颗粒是芳香醛。这项研究的结果将有助于对面临气候变化的红树林生态系统的生态系统服务进行建模。 （c）2020年作者。由Elsevier B.V.出版
Mangrove forests grow in coastal saline environments and, little is known about the stand water use (S) and regulation mechanisms of mangrove forests, particularly in the eastern mangrove group. We measured the xylem sap flow density (SFD) of six tree species for two years in a tropical mangrove forest on Hainan Island, China, which is under a monsoon climate. Bimodal daily SFD patterns were observed in all six species in spring and summer. The sap flow of all species were suppressed in winter strongly and also in spring. The annual water use per tree was positively correlated with diameter at breast height (DBH) (R-2 1/4 0.81-0.89, P < 0.05). By scaling up from individual trees, we found that the S values of two mangrove plots ranged from 269.19 to 357.27 mm y(-1) between the two study years, accounting for 18-22% of the annual rainfall. These S values are similar to those of other mangrove and tropical forests with similar stand basal areas. The crown conductance sensitivity (mc) to ln VPD (vapor pressure deficit) was strongly correlated with reference crown conductance (GCref) at 1 kPa VPD across all species. The slope value between mc and GCref divided the six species into two groups, suggesting Bruguiera sexangula, Rhizophora apiculata and Sonneratia alba were isohydric, Excoecaria agallocha, B. s. var. rhymchopetala and Xylocarpus granatum were anisohydric. The results of this study will be useful for modeling ecosystem services of mangrove ecosystems facing climate change. (C) 2020 The Authors. Published by Elsevier B.V.