MRI links stem water content to stem diameter variations in transpiring trees

被引:83
作者
De Schepper, Veerle [1 ]
van Dusschoten, Dagmar [2 ]
Copini, Paul [3 ]
Jahnke, Siegfried [2 ]
Steppe, Kathy [1 ]
机构
[1] Univ Ghent, Fac Biosci Engn, Dept Appl Ecol & Environm Biol, Plant Ecol Lab, B-9000 Ghent, Belgium
[2] Forschungszentrum Julich, IBG Plant Sci 2, D-52425 Julich, Germany
[3] Wageningen Univ, Ctr Ecosyst Studies, Forest Ecol & Forest Management Grp, NL-6700 AA Wageningen, Netherlands
关键词
Dendrometer; girdling; LVDT; MRI; micrograph; oak; Quercus robur L; stem diameter changes; stem growth; water content; xylem; SAP FLOW DYNAMICS; SUGAR-TRANSPORT; DIURNAL CHANGES; RADIUS CHANGES; BEECH TREE; XYLEM FLOW; PHLOEM; LONG; ANATOMY; STORAGE;
D O I
10.1093/jxb/err445
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In trees, stem diameter variations are related to changes in stem water content, because internally stored water is depleted and replenished over a day. To confirm this relationship, non-invasive magnetic resonance imaging (MRI) was combined with point dendrometer measurements in three actively transpiring oak (Quercus robur L.) trees. Two of these oak trees were girdled to study the stem increment above the girdling zone. MRI images and micrographs of stem cross-sections revealed a close link between the water distribution and the anatomical features of the stem. Stem tissues with the highest amount of water were physiologically the most active ones, being the youngest differentiating xylem cells, the cambium and the youngest differentiating and conductive phloem cells. Daily changes in stem diameter corresponded well with the simultaneously MRI-measured amount of water, confirming their strong interdependence. MRI images also revealed that the amount of water in the elastic bark tissues, excluding cambium and the youngest phloem, contributed most to the daily stem diameter changes. After bark removal, an additional increase in stem diameter was measured above the girdle. This increase was attributed not only to the cambial production of new cells, but also to swelling of existing bark cells. In conclusion, the comparison of MRI and dendrometer measurements confirmed previous interpretations and applications of dendrometers and illustrates the additional and complementary information MRI can reveal regarding water relations in plants.
引用
收藏
页码:2645 / 2653
页数:9
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