| 松嫩平原主要盐碱植物群落生物生态学机制的初步探讨 |
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| 引用本文： | 杜晓光,郑慧莹.松嫩平原主要盐碱植物群落生物生态学机制的初步探讨[J].植物生态学报,1994,18(1):41-49. |
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| 作者姓名： | 杜晓光 郑慧莹 |
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| 作者单位： | 中国科学院植物研究所 |
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| 摘 要： | 本文采用野外调查分析和室内实验相结合的方法，从不同方面初步探讨松嫩平原三个盐碱植物群落的生物生态学机制，实验和分析结果表明：(1)土壤盐碱含量是决定盐碱植物群落组成和分布的主导因素。在植物群落的生态分布上，表现出虎尾草群落、星星草群落和碱蓬群落对盐碱的耐性有逐渐增强的趋势。(2)在实验室控制条件下，群落的建群种碱蓬、星星草、虎尾草对盐碱生境的生理适应性依次减弱。(3)在盐碱含量不同的土壤上，星星草体内脯氨酸含量与土壤总含盐量，特别是土壤中Na+含量呈正相关，说明植物通过调节体内某些生理反应来适应盐碱生境。上述结果初步揭示了松嫩平原主要盐碱植物群落的生物生态学机制。
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| 关 键 词： | 松嫩平原 盐碱植物群落 机制 |
A PRELIMINARY STUDY ON THE MAIN PLANT COMMUNITIES IN THE SALINE SOILS OF SONG-NEN PLAIN |
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| Du Xiao-guang, Zheng Hui-ying, Liu Cun-de.A PRELIMINARY STUDY ON THE MAIN PLANT COMMUNITIES IN THE SALINE SOILS OF SONG-NEN PLAIN[J].Acta Phytoecologica Sinica,1994,18(1):41-49. |
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| Authors: | Du Xiao-guang Zheng Hui-ying Liu Cun-de |
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| Abstract: | Using field investigations and laboratory experiments, we examined the factors influencing the distribution and composition of three plant communities of Song-Nen Plain. Our results showed that:1. The salt content in the soil was a key factor determining the distribution and composition of plant communities. The dominances of Chloris virgata, Puccinellia tenuiflora and Suaeda glauca in different communities changed along a soil salt content gradient, with Suaeda glauda being the most dominant species in the soils of highest pH, Chloris Virgata being in the soils of lowest pH, and Puccinellia tenuiflora falling in between. The distribution range of Chloris virgata was wider than either Puccinellia tenuiflora or Suaeda glauca.2. Under controlled conditions in the laboratory, the germination rate, growth performances(fresh weight, height), respiration intensity,ATP content and cell membrane permeability of the three species decreased as the concentrations of Na2CO3 in the growth media increased. The salt-tolerant strength followed the order of Suaeda glauca>Puccinellia tenuiflora>Chloris virgata. Because Suaeda glauca and Puccinellia tenuiflora needed certain concentrations of salt to grow, they could not grow well at the conditions of low salt content in the soil, and, therefore, their distribution range was limited. On the other hand, the growth of Chloris virgata was evidently inhibited under high salt conditions, but not inhibited when the salt content was low, and thus their distribution spanned a wide range.3. The proline content in the tissues of Puccinellia tenuiflora was positively correlated with the total salt(particularly Na+)content in the soil, indicating that Puccinellia tenuiflora can adapt to high-salt environments by changing their internal physiological reactions. |
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| Keywords: | Song-Nen Plain Chloris virgata Puccinellia tcnuiflora Sua-eda glauca Salt-resistance |
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