摘要
为了探明杭州湾湿地植物碱蓬Suaedae glauca,南方碱蓬Suaeda australis,芦苇Phragmites australis和野艾蒿Artemisia lavandulaefolia等各自生境土壤盐分高低是否和种子在盐分胁迫下的萌发能力相一致,试验比较了它们所在生境的土壤含盐量、pH值及含水率,测定了4种植物种子在不同质量浓度氯化钠(NaCl)(0～50 g·L-1)溶液处理下的萌发率,并分析了土壤含盐量、pH值和含水率和20 g·L-1氯化钠溶液处理的种子萌发率之间的相关性。结果表明,各物种生境土壤含盐量顺序是南方碱蓬>碱蓬>芦苇>野艾蒿;土壤pH值为芦苇>野艾蒿>南方碱蓬和碱蓬;土壤含水率为碱蓬>芦苇>南方碱蓬>野艾蒿。氯化钠溶液处理对4种种子萌发率都有显著影响,萌发率随盐分质量浓度增加而下降;同一盐分质量浓度下,萌发率高低顺序依次是碱蓬>南方碱蓬>芦苇>野艾蒿。复水后氯化钠溶液处理的种子萌发率都显著提高,但不同物种萌发率高低顺序和复水前相同。相关分析表明,土壤含盐量和不同种子在20 g·L-1氯化钠胁迫下的萌发率是显著相关的。这些结果表明,土壤含盐量是限制上述4种种子萌发的重要因素;4种植物的分布是和它们各自生境的盐分高低条件和种子在盐分胁迫条件下的萌发能力相关的。
Abstract： In the Hangzhou Bay Wetlands, plant species occupy different habitats. It is not clear whether the distribution pattern of plant species was related to their ability to germinate under salt stress conditions. Soils from the habitats of four populations of Suaeda glauca, Suaeda australis, Phragmites australis, and A rtemisia lavandulifolia were sampled respectively and soil salt content, pH, and water content were analyzed and com- pared. The percent germination of their seeds when exposed to 0-50 g＂ L-t NaC1 solution was measured by ger- minating 30 seeds in three Petri dishes respectively in an illumination incubator at 28 ~C. Finally, correlation between germination percent of seeds for the four species exposed to a 20 g-L-1 NaC1 solution versus soil salt content, pH, and water content was analyzed. Results for the four species showed that the soil salt content of the growth habitats was S. glauca 〉 S. australis 〉 P. australis 〉 A. lavandulifolia; soil pH was P. australis 〉 A. lavandulifolia 〉 S. glauca and S. australis; and soil water content was S. glauca 〉 P. australis 〉 S. australis 〉 A. lavandulifolic~ With the NaC1 solution （0-50 g-L-l）, the percent germination decreased signifi-cantly （P 〈 0.001 ） with increase in NaC1 concentration. For the same level of NaC1 concentration, the percent germination was S. glauca 〉 S. australis 〉 P. australis 〉 A. lavandulifolia. After replacement of NaC1 solu- tion （0-50 g·L-1） with distilled water, the seed germination percent remarkably increased （P 〈 0.01）. But the final germination capacity was in the same order as before the replacement. In addition, only the soil salt con- tent was strongly related to percent germination of the four seed-types exposed to 20 g· L-1 NaC1 solution （P 〈 0.05）. These results indicated that soil salt content was an important limiting factor for seed germination, and the distribution pattern of the four plant species was generally related to their habitat＇s soil salt content and the ability of the seeds to germinate at high NaC1 concentrations. [ch, 2 fig. 2 tab. 17 ref.]
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2012年第5期739-743,共5页
Journal of Zhejiang A&F University
基金
中央级公益性科研院所基本科研业务费专项资金资助项目(RISF6160)
关键词
植物生理学
杭州湾湿地
盐胁迫
种子萌发率
土壤含盐量
相关性
plant physiology
Hangzhou Bay Wetlands
salt stress
seed germination
soil salt content
correlation
