干旱区生态环境知识资源中心(Arid): 不同水分处理下喀斯特土层厚度异质性对两种草本叶片解剖结构和光合特性的影响

Arid

	不同水分处理下喀斯特土层厚度异质性对两种草本叶片解剖结构和光合特性的影响
其他题名	Effects of karst soil thickness heterogeneity on the leaf anatomical structure and photosynthetic traits of two grasses under different water treatments
	李周; 赵雅洁; 宋海燕; 张静; 陶建平; 刘锦春
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:2 页码:721-732
中文摘要	为了探究不同水分处理下草本植物对喀斯特土层厚度变化的叶片形态建成和光合生理响应,以黑麦草(Lolium perenne L.)和苇状羊茅(Festuca arundinacea Schreb.)为研究对象,通过盆栽水分受控试验,研究了3种水分处理[正常供水(W_(ck)),减水1组(D1)和减水2组(D2) ]下3种土层厚度[浅土组(S_S) 、对照组(S_(CK))和深土组(S_D) ]对两种草本叶片解剖结构和光合特性的影响。结果表明: (1)正常供水下(W_(ck)),黑麦草和苇状羊茅在浅土组(S_S)的气孔密度和气孔限制值(Ls)均显著高于对照组(S_(CK)),净光合速率(Pn) 、胞间CO_2浓度(Ci)和蒸腾速率(Tr)降低;在深土组(S_D),两种植物的气孔密度都有所下降,黑麦草的叶脉密度、Pn和Tr均低于对照组,而苇状羊茅的叶脉密度和Pn表现出增加;(2) D1水分条件下,黑麦草在浅土组的气孔密度较对照组增加,叶脉密度、Pn和Tr均降低,而苇状羊茅的气孔密度有所降低,叶脉密度、Pn和Tr未受到显著影响;在深土组中,黑麦草的气孔密度不变,叶脉密度增加,而Pn和Tr均降低;苇状羊茅的气孔密度降低,但叶脉密度、Pn和Tr均升高;(3) D2水分条件下,两种植物在浅土组的叶脉密度较对照组均增加,气孔密度、Pn和Tr均受到抑制;在深土组,黑麦草的远轴面气孔密度较对照组下降,两种植物的其他指标未受到明显影响。可见,在不同水分条件下,植物的叶片解剖结构和光合特性对不同土层厚度的响应不一,且不同物种间也有差异。总体上随着水分减少,土层厚度降低对植物的光合抑制作用增强,而厚度增加对深根植物的光合促进作用和对浅根植物的光合抑制作用先增强后减弱。植物气孔和叶脉性状特征随水分条件的变化在一定程度上与叶面积和叶片宽度的变化有关。
英文摘要	Congenitally slow soil development rates and acquired rocky desertification ensure a serious shortage of soil resources in karst areas.Coupled with the steep terrain,soil distribution is uneven with a high degree of heterogeneity in space in karst regions.In the karst depression,basin,and valley areas,soil thickness and soil distribution are continuous;however,in the hill slope area,soil is usuallyrock soilor is missing.Uneven distribution of karst soil also leads to obvious spatial heterogeneity of moisture.Global precipitation changes might aggravate heterogeneity of soil moisture in soils of different thicknesses.Plant morphogenesis is very sensitive to soil moisture,including the leaf veins that control water transport and utilization and the stomata that adjust the balance of water and CO_2.Simultaneously,photosynthesis that utilizes water and CO_2 as raw materials is also directly affected by soil moisture.Thus,exploring the responses of the leaf anatomical structure and photosynthetic traits of plants to water availability and soil heterogeneity in karst regions is necessary to understand how precipitation changes might affect plant growth and physiology in soils of different thicknesses.Herbaceous plants,especially grasses in karst regions,are most often affected by soil heterogeneity and water availability because they mainly utilize water and nutrients from the surface soil via their fibrous root system.Two graminaceous perennial grasses,Lolium perenne L.and Festuca arundinacea Schreb.were chosen for the present study.These two species are often chosen as pioneer plants for ecological restoration and reconstruction in karst regions because of their attributes of fast growth,strong adaptive ability,and high yield,which effectively promote economic development and assist to alleviate rural poverty in harsh karst regions.In the present study,three water treatments (WCK: 40 mL /d,D1: 20 mL /d,and D2: 12 mL /d) were combined with three levels of soil thickness [shallow soil (S_S: 5 cm),control (S_(CK): 15 cm),and deep soil (S_D: 30 cm) ]in a factorial randomized design and measurements were obtained of leaf vein and stomata traits and several photosynthetic parameters.
中文关键词	喀斯特 ; 土层空间异质性 ; 叶脉 ; 气孔 ; 光合生理
英文关键词	karst spatial heterogeneity of soil vein stomata photosynthetic physiology
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:6155616
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238096
作者单位	西南大学生命科学学院, 三峡库区生态环境教育部重点实验室;;重庆市三峡库区植物生态与资源重点实验室, 重庆 400715, 中国
推荐引用方式 GB/T 7714	李周,赵雅洁,宋海燕,等. 不同水分处理下喀斯特土层厚度异质性对两种草本叶片解剖结构和光合特性的影响[J],2018,38(2):721-732.
APA	李周,赵雅洁,宋海燕,张静,陶建平,&刘锦春.(2018).不同水分处理下喀斯特土层厚度异质性对两种草本叶片解剖结构和光合特性的影响.生态学报,38(2),721-732.
MLA	李周,et al."不同水分处理下喀斯特土层厚度异质性对两种草本叶片解剖结构和光合特性的影响".生态学报 38.2(2018):721-732.