干旱区生态环境知识资源中心(Arid): 梭梭根系的水分再分配特征对其生理和形态的影响

Arid

	梭梭根系的水分再分配特征对其生理和形态的影响
其他题名	Root Internal Hydraulic Redistribution and Its Effects on the Physiological Form and Plant Growth of Haloxylon ammodendron
	朱丽 1; 黄刚 1; 唐立松 1; 李彦1 ; 张永梅 1; 盛建东 2
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2017
卷号	34 期号:3 页码:638-647
中文摘要	采用上下分根方法及根系观测技术,设置控制处理(仅接受白天自然光照),夜间光照处理(接受24 h光照),加水及夜间光照处理(接受24 h光照+加水),对梭梭根系是否存在水分再分配作用进行了验证,在此基础之上,进一步研究了水分再分配对梭梭生理和形态的影响。结果表明: ①控制处理梭梭黎明前及正午同化枝水势高于夜间光照处理,且控制处理和加水及夜间光照处理梭梭上管部分根水势也较夜间光照处理高,说明夜间弱蒸腾作用下,控制处理的梭梭发生了水分再分配作用。②水分再分配作用促进梭梭蒸腾及光合作用,控制处理与加水及夜间光照处理的梭梭蒸腾速率均大于夜间光照处理,且控制处理和加水及夜间光照处理的梭梭最大净光合速率也较夜间光照处理高。③控制处理与加水及夜间光照处理梭梭地上部分生物量显著高于夜间光照处理,不同处理的梭梭地下部分总生物量、上管地下部分生物量及上管比根长的关系为:加水及夜间光照处理>控制处理>夜间光照处理。梭梭具有水分再分配作用,在夜间弱蒸腾条件下,根系吸收下层湿润土壤中的水分并释放至上层干燥土壤中,以缓解干旱环境下植物的水分亏缺,水分再分配作用可促进植物蒸腾及光合作用,增加植物的根冠比和根系碳分配。
英文摘要	Water redistribution within root system can mitigate root drought stress in dry season. In this study,a split-root pot cultivation experiment was conducted to test the effects of root hydraulic redistribution of Haloxylon ammodendron,and the root dynamics was observed by minirhizotron method. Considering the occurrence of hydraulic redistribution in the low evaporative demand,a series of growth and water physiological and root dynamic characteristics of plant in wet and dry split rhizospheres of pot were measured under three treatments: control (C): 24- hour light + supplemental water (LW); and 24-hour light only (L). The results are as follows: ① The leaf water potential of plant in control at dawn and on midday was higher in compared to that in light treatment,and the root water potential of dry soil zone (the upper tube) in control and light and water addition treatment was also higher than that in light treatment. This result indicated that water potential of roots in dry soil zone in control partly recovered at dawn on next day due to the hydraulic redistribution at night; ② The transpiration and the maximum net photosynthetic rates under the control and light and water addition treatments were higher than those in light treatment, which suggested that the root internal hydraulic redistribution protected the deterioration of plant photosynthetic physiological activities under draught stress; ③ The aboveground biomass under light treatment was lower in compared to that in the control and light and water addition treatments,and the root dry weight of the whole plant, root dry weight in dry soil zone and specific root length (SRL) were significantly different among the treatments and in a rank of LW > C > L. In sum, the effects of water hydraulic redistribution on water potential and photosynthetic characteristics of H. ammodendron were observed,which proved that the hydraulic redistribution could protect the roots of desert shrub in topsoil under temporal soil draught and maintain a healthy physiological activity.
中文关键词	梭梭(Haloxylon ammodendron) ; 根系 ; 土壤含水量 ; 同化枝水势 ; 水分再分配 ; 蒸腾速率
英文关键词	Haloxylon ammodendron root soil moisture content assimilating branch water potential hydraulic redistribution transpiration rate
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:5990119
来源机构	中国科学院新疆生态与地理研究所 ; 新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235990
作者单位	1.中国科学院新疆生态与地理研究所, 荒漠与绿洲国家重点实验室, 乌鲁木齐, 新疆 830011, 中国; 2.新疆农业大学草业与环境科学学院, 乌鲁木齐, 新疆 830052, 中国
推荐引用方式 GB/T 7714	朱丽,黄刚,唐立松,等. 梭梭根系的水分再分配特征对其生理和形态的影响[J]. 中国科学院新疆生态与地理研究所, 新疆农业大学,2017,34(3):638-647.
APA	朱丽,黄刚,唐立松,李彦,张永梅,&盛建东.(2017).梭梭根系的水分再分配特征对其生理和形态的影响.干旱区研究,34(3),638-647.
MLA	朱丽,et al."梭梭根系的水分再分配特征对其生理和形态的影响".干旱区研究 34.3(2017):638-647.