Comparative study on seasonal changes in element concentrations in leaves of Kandelia candel and Rhizophora stylosa at Jiulongjiang estuary
- 生命科学－已发表论文 
[中文文摘]研究了福建九龙江口秋茄 (Kandelia candel L.)和红海榄 (Rhizophora stylosa G.)成熟叶片 N、P、K、Na、Ca、Mg和Cl等元素含量的季节变化和元素间的关系。结果表明秋茄和红海榄同为红树科树种 ,生境相同且同属拒盐植物 ,但在元素积累及季节变化模式上存在较大差别。秋茄和红海榄叶片高盐分和 Ca含量及低 K/Na比 ,这是它们对盐渍生境的一种适应。秋茄无机渗透调节剂 (主要指 K+、Na+、Ca2 +、Mg2 +和 Cl- )含量夏季高于冬季 ,而红海榄与之完全相反。秋茄能够通过主动积累有机渗透调节剂来适应低温 ,而红海榄不能。对秋茄和红海榄抗寒机制进行了讨论.[英文文摘]The seasonal changes of N, P, K, Na, Ca, Mg and Cl concentrations in the mature leaves of Kandelia candel L. Druce and Rhizophora stylosa Griff at Jiulongjiang estuary were studied in the resent study , and the relationships among elements were discussed. Although K . candel and R. stylosa all belong to Rhiz ophor aceae and salt -exclusion types and occur on the same habitat , they were differ entin the patterns in terms of element accumulation and seasonal changes. T he leaves of K . candel and R. sty losa were rich in salt s and Ca, with lower K/ Na rat io , indicating K . candel and R. stylos a are adaptive to saline enviro nment s. The ino rg anic osmot ica ( K+ 、Na+ 、Ca2+ 、Mg 2+ and Cl- ) in warm season w er e hig her than that in cold seaso n in K . candel. Howev er , they wer e low er t han t hat in co ld season in R . sty losa. K . candel could accumulat eorganic osmot ica to adapt itself to low temperat ur e, but R. stylosa could not . The cold resist ant mechanisms of them were also discussed.