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周瑞莲,贾有余,侯月利,石琳琳.不同厚度沙埋下植物光合特性变化与补偿性生长的关系.生态学报,2016,36(24):8111~8119 本文二维码信息
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不同厚度沙埋下植物光合特性变化与补偿性生长的关系
Relationship between changes in photosynthetic characteristics and plant compensatory growth under different sand burial depths
投稿时间:2015-05-01  修订日期:2016-10-15
DOI: 10.5846/stxb201505010898
关键词沙埋  单叶蔓荆  净光合速率  蒸腾速率  补偿性生长
Key Wordssand burial  Vitextrifoliavar.Simplicifolia  net photosynthetic rate  transpiration rate  compensatory growth
基金项目国家自然科学基金资助项目(31270752);烟台市科技局资助项目(2013ZH351)
作者单位E-mail
周瑞莲 鲁东大学生命科学学院, 烟台 264025 zhourl726@163.com 
贾有余 内蒙古农牧科学院资源环境与检测技术研究所, 呼和浩特 010030  
侯月利 鲁东大学生命科学学院, 烟台 264025  
石琳琳 鲁东大学生命科学学院, 烟台 264025  
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摘要:
在自然条件下通过对海岸沙地不同株型单叶蔓荆(Vitextrifolia var. simplicifolia Cham)在不同厚度沙埋处理下土壤温度、湿度,沙上叶片鲜重(FW)和干重(DW)、叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)的测定以揭示沙埋后植物的快速生长与光合作用的关系以及植物补偿性生长在其耐沙埋中的作用。结果表明,不同厚度沙埋下,土壤表层含水量最低和温度最高(40℃),随着沙埋厚度增加,土壤含水量显著增加,而土壤温度(28℃)降低。轻度和中度沙埋5 d和10 d,幼株和成株沙上叶片鲜重(FW)和干重(DW)增加,单叶蔓荆成株沙上顶部叶片FW分别较对照增加27%和29%;DW较对照增加23% 和27%,并与对照差异显著(P < 0.05)。幼株和成株单叶蔓荆对照和不同厚度沙埋下沙上叶片PnTrGs日变化曲线均呈现"双峰型",且植株上部叶片PnTrGs高于下部叶片。但在轻度和中度沙埋处理下,幼株和成株单叶蔓荆叶片PnTrGs增加并高于对照,成株在光合第一个高峰期顶部叶片Pn分别较对照高13% 和24%,Tr分别较对照增加33% 和72%,Gs较对照分别增加了55% 和27%。研究表明,沙埋下植株快速生长和叶片物质积累加速与光合作用增高呈正相关。沙埋胁迫激活植株补偿生长是引起植物Pn增加,干物质积累的主要原因。而沙埋使叶片损失导致植物能量代谢失衡是激活补偿生长的内因,沙埋使植物下部处于低温潮湿环境是补偿生长的外因。沙埋胁迫下植物补偿生长在其维持能量和物质代谢平衡和适应沙埋中起重要作用,是单叶蔓荆适应沙埋的重要生理调控策略。
Abstract:
Vitextrifoliavar. simplicifolia grown on the coast of Yantai was examined to understand the compensatory mechanisms associated with changes in photosynthetic characteristics and rapid plant growth. Specifically, the water content and temperature at different soil depths, as well as the fresh weight(FW), dry weight (DW), net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) in above-sand leaves of V.trifolia under sand burial were measured. Under sand burial, the surface soil had a higher temperature (40℃) and lower soil water content. However,as the soil depth increased, the water content of the soil increased and temperature decreased (28℃). After 5 and 10days of light and moderate sand burial, the leaves above the sand on large plants and young plants had higher FW and DW than those of control plants. For instance, the FW values of the top leaves of large plants were significantly higher (by 27% and 29%) and the DW values (23% and 27%) were also significantly higher than those of control plants. The diurnal course of Pn, Gs, and Tr presented a bimodal pattern in the leaves of V.trifolia with light and moderate sand burial and without sand burial, and were higher in the upper leaves than in the lower leaves of the plant. Under light and moderate sand burial, the Pn, Tr, and Gs of the leaves of young and large plants of V.trifolia increased and were higher than those of control plants. For instance, the leaves of larger plants under light and moderate sand burial at the first peak of photosynthesis had higher Pn(by 13% and 24%),Tr(by 33% and 72%), and Gs(by 55% and 27%) than those of control plants. This indicated that rapid plant growth and increased material accumulation in the top leaves under sand burial were positively correlated with increased Pn and plant compensatory growth. The plant compensatory growth activated by sand burial stress resulted in increased Pn and dry matter accumulation. The imbalance in energy and material metabolism through lost leaves caused by sand burial acted as an internal cue that activated plant compensatory growth. The lower parts of plants were exposed to lower temperatures and moister conditions, which were external causes of plant compensatory growth. This suggested that compensatory growth in V.trifolia plays an important role in maintaining the balance between energy and material metabolism and adaptation to sand burial.
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