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| 土壤结构与光照水平对秋茄某些生长和生理参数的影响 | |
| 引用本文： | 叶勇,谭凤仪,卢昌义.土壤结构与光照水平对秋茄某些生长和生理参数的影响[J].植物生态学报,2001,25(1):42-49. |
| 作者姓名： | 叶勇 谭凤仪 卢昌义 |
| 作者单位： | 1. 宁波大学 2. 香港城市大学生物及化学系, 3. 厦门大学教育部 |
| 摘 要： | 在香港的３个红树森样地即黄竹湾（沙土）、西径（沙壤土）和米埔（粘壤土）进行了土壤结构对秋茄（Kandelia candel(L.)Durce)生长和生理影响的研究，并在米埔比较了林内和林外秋茄幼苗的生长和生理参数以观察光照水平的效应。在沙土和沙壤土生长的１．５年秋茄幼苗比粘壤土具有较粗的基径的较高的总生物量，说明秋茄幼苗在沙土和沙壤土中比在粘壤土中生长更好。沙土１．５ 茄幼苗的叶片厚度分别为沙壤土和粘壤土的１．７５和２．０５倍，表明沙土中的秋茄幼苗具有旱生结构以维持体内水分。然而，沙土和沙壤土４．５年秋茄幼树的叶片厚度无显著差异，沙土和沙壤土中１．５年秋茄幼苗分配于根系的生物量比例约为５０％，高于粘壤土的值（约４０％）。沙土和沙壤土中１．５年的秋茄比粘壤土具有较低的叶绿素含量、根系活力、硝酸盐还原酶活性、过氧化物酶（ＰＯＸ）活性、超氧化物歧化酶（ＳＯＤ）活性及较高的丙二醛（ＭＤＡ）含量。米埔１．５年秋茄幼苗在红树林外比林内有更好的长势，具有更大的叶面积、特殊叶面积、叶片数量及生物量。林内幼苗具有较高叶绿素含量，较低叶绿素a/b比值，较高硝酸盐还原酶活性和较强的根系活力，林外幼苗的叶片ＰＯＸ和ＳＯＤ活性比林内的值稍高，ＭＤＡ含量比林内显著要高。 |
| 关 键 词： | 秋茄 红树林 土壤结构 光照水平 |
| 修稿时间： | 1999年12月27 |
EFFECTS OF SOIL TEXTURE AND LIGHT ON GROWTH AND PHYSIOLOGY PARAMETERS IN KANDELIA CANDEL |
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| YE Yong,TAN Feng-Yi,LU Chang-yi.EFFECTS OF SOIL TEXTURE AND LIGHT ON GROWTH AND PHYSIOLOGY PARAMETERS IN KANDELIA CANDEL[J].Acta Phytoecologica Sinica,2001,25(1):42-49. | |
| Authors: | YE Yong TAN Feng-Yi LU Chang-yi |
| Affiliation: | YE Yong 1 TAN Feng-Yi 2 and LU Chang-Yi 3 |
| Abstract: | Growth and physiological changes in Kandelia candel (L.) Druce with varying soil texture were investigated at three sites in Hong Kong: at Wong Chuk Wan(sandy soil), Sai Keng(loamy-sandy soil) and Mai Po(silty-loamy soil). The effects of light level were studied at Mai Po by comparison of plants located under a mangrove canopy with those in a light gap. 1.5 year old K. candel plants had a larger basal stem diameter and higher total biomass in sandy and loamy-sandy soil than in silty-loam soil, partially indicating that K. candel seedlings can grow better in sandy soil than loamy soil. Leaf thickness of 1.5 year old K. candel seedlings growing in sandy soil was 1.75 and 2.05 times that of seedlings from loamy-sandy soil and silty-loamy soil, respectively, indicating that K. candel seedlings developed a xerophilous character to maintain water. However, this response is dependent on plant age as no significant difference was observed in leaf thickness of 4.5 year old plants growing in sandy and loamy-sandy soil. In 1.5 year old K. candel seedlings more biomass was allocated to roots in sandy and loamy-sandy soils (about 50%) than silty-loamy soil (about 40%). 1.5 year old K. candel plants had a lower chlorophyll content and lower root, reductase, peroxidase and superoxide dismutase activities, but higher malonaldehyde content than in silty-loamy soil. K. candel seedlings at Mai Po grew better in light gaps than under a mangrove canopy. Light gap plants had relatively larger leaf area, specific leaf area, leaf number and biomass. Also, there was higher Chl content and lower Chl a/b ratio in leaves of 1.5 years old K. candel plants growing under the mangrove canopy than those growing in light gaps, as well as higher leaf nitrate reductase activity and higher root activity. POX activity and SOD activity in leaves of K. candel seedlings growing under light gap conditions were slightly, but not significantly, higher than in leaves of seedlings growing under the mangrove canopy, resulting in higher MDA content. |
| Keywords: | Kandelia candel Mangrove Soil texture Light level |
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