干旱区生态环境知识资源中心(Arid): 多枝柽柳改变胡杨幼苗根系对土壤水盐的响应

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	多枝柽柳改变胡杨幼苗根系对土壤水盐的响应
其他题名	Tamarix ramosissima changes the responses of root morphology of Populus euphratica seedlings to various soil water and salinity conditions
	雷善清; 王文娟; 徐艺心; 王雨辰; 陈利俊; 杜志强; 李景文
来源期刊	北京林业大学学报
ISSN	1000-1522
出版年	2020
卷号	42 期号:7 页码:89-97
中文摘要	【目的】根系的生长是胡杨幼苗能否定植和实现有效更新的关键,本研究拟探讨根系生长对土壤环境以及生物因子的响应,为胡杨适应特性的进一步研究提供参考, 并为胡杨林的保护管理提供理论依据。【方法】以当年生胡杨幼苗根系为研究对象,通过盆栽控制实验,设置胡杨-胡杨、胡杨-柽柳两种伴生模式,3个水盐梯度交互,研究胡杨当年生幼苗根系形态特征对伴生多枝柽柳以及土壤水盐的响应。【结果】(1)当年生胡杨幼苗根系形态具有保守性,一定范围的水盐条件下,主营固着的根系(根径大于0.5 mm)和营吸收功能的根系(根径小于0.5 mm)数量分布相对稳定,不随水盐梯度的改变而变化,但种间竞争的存在改变这种形态特性。(2)多枝柽柳伴生的条件下,幼苗拥有更大的比根长和比根面积, 吸收能力提高,但是根系生长受到强烈抑制,基径、总根体积、根表面积等指标显著降低(P < 0.01)。(3)多枝柽柳伴生会改变胡杨幼苗根系形态特征对土壤水盐的塑性响应,表现为胡杨-柽柳组的胡杨幼苗对盐分变化更为敏感。相对于盐分,水分和伴生模式对根系生长的影响更为关键。【结论】当年生胡杨幼苗根系对种间竞争表现出一定的适应策略,但与多枝柽柳的竞争仍对胡杨的根系生长产生不利的影响。对野外的胡杨幼苗而言,多枝柽柳的竞争也是威胁其生存的重要因素。
英文摘要	[Objective] Root is the key organ for Populus euphratica to colonize and regenerate in the field. In this study, we investigated the responses of root growth to soil conditions and biological factors to provide support for further study on adaptive strategy of Populus euphratica seedlings and provide a theoretical basis for protection management of Populus euphratica forests in northwestern arid area of China. [Method] Here, a controlled pot experiment was conducted to study the responses of root morphological features of annual Populus euphratica seedlings to interspecific competitor under 3 levels of water and salinity and their interactive effects. [Result] (1) Under various levels of water and salinity, roots mainly for absorption (diameter under 5 mm) and for anchoring (above 5 mm) maintained stable proportions, indicating a conservative root morphology of annual Populus euphratica seedlings. But interspecific competition with Tamarix ramosissima changed this property. (2) Annual Populus euphratica seedlings had larger special root length and special root area while growing with Tamarix ramosissima seedlings, which meant higher absorbing ability in mixed planting pattern. However, total root volume, root surface area and basal diameter significantly dropped compared with those grew with intraspecific individuals, demonstrating neighboring Tamarix ramosissima seedlings could intensively restrict root growth of annual Populus euphratica seedlings. (3) Water condition and neighbor had more significant effects on root growth of Populus euphratica seedlings instead of salinity condition. Neighboring Tamarix ramosissima seedlings could change root plastic responses of Populus euphratica seedlings to water and salinity, making Populus euphratica seedlings more vulnerable to salinity stress. [Conclusion] In summary, root morphology of annual Populus euphratica seedlings shows adaptive strategy while competing with neighboring Tamarix ramosissima seedlings, but still interspecific competition leads to harmful outcomes for growth of Populus euphratica. For seedlings growing on floodplain, interspecific competition may also be a major threat to their survival.
中文关键词	胡杨 ; 多枝柽柳 ; 竞争 ; 根系特征 ; 水盐条件
英文关键词	Populus euphratica Tamarix ramosissima competition root trait water and salinity condition
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:6782967
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/353319
作者单位	雷善清, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 王文娟, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 徐艺心, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 王雨辰, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 杜志强, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 李景文, 北京林业大学生态与自然保护学院, 北京 100083, 中国. 陈利俊, 国营额济纳旗林场, 额济纳, 内蒙古 735400, 中国.
推荐引用方式 GB/T 7714	雷善清,王文娟,徐艺心,等. 多枝柽柳改变胡杨幼苗根系对土壤水盐的响应[J],2020,42(7):89-97.
APA	雷善清.,王文娟.,徐艺心.,王雨辰.,陈利俊.,...&李景文.(2020).多枝柽柳改变胡杨幼苗根系对土壤水盐的响应.北京林业大学学报,42(7),89-97.
MLA	雷善清,et al."多枝柽柳改变胡杨幼苗根系对土壤水盐的响应".北京林业大学学报 42.7(2020):89-97.