TANNINS IN MANGROVE TREE ROOTS AND THEIR ROLE IN THE ROOT ENVIRONMENT
TANNINS IN MANGROVE TREE ROOTS AND THEIR ROLE IN THE ROOT ENVIRONMENT
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DOI：
10.1080/00380768.1989.10434741
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发表时间：
1989-03-01
影响因子：
2
通讯作者：
WADA, H
中科院分区：
文献类型：
--
作者：
KIMURA, M;WADA, H
红树林生长在还原性条件下，有时是酸性条件，这两种条件都对根系生长有害。本文研究了单宁在红树根系中的作用，以减轻其对土壤环境的不利影响。红树林树根含有大量的单宁，它与土壤溶液中的铁离子结合，形成单宁-铁复合物，导致树根变黑。用亚硫酸氢钠对黑色络合物进行还原脱色。硫化氢也能使黑色络合物脱色。脱色的根可以可逆地变黑加入铁。基于这些现象，认为红树林树根中的单宁与土壤溶液中的铁结合，减轻了铁的过量损害。由此形成的单宁-铁络合物通过氧化来抵消硫化氢对根的毒性。这两种有害物质通常存在于红树林的根环境中。
Mangrove trees grow under reductive and sometimes acidic conditions, both of which are injurious to the root growth. In this report, the role of tannins in mangrove tree roots was studied in order to alleviate their detrimental effect on the soil environment. The mangrove tree roots contain a large amount of tannins and it combines with ferric ion in the soil solution resulting in the blackening of the roots due to the formation of a tannin-ferric iron complex. The black complex is decolorized by the reduction treatment with sodium hydrosulfite. Hydrogen sulfide is also able to decolorize the black complex. The decolorized roots can become reversibly black with the addition of ferric iron. Based on these phenomena, it is considered that the tannins in mangrove tree roots combine with iron in the soil solution, to alleviate the iron excess damage. The tannin-ferric iron complex thus formed counteracts the hydrogen sulfide toxicity to roots by oxidation. Both of these harmful substances are usually present in the root environment of mangrove trees.