摘要
为了研究在干旱半干旱地区植物叶片是否能利用发生频率较高而又无法被植物根系吸收利用的小量级降雨,以宁夏中部干旱半干旱地区50种植物为研究对象,测定叶片的单位面积吸水量(leaf water uptake content,LWUC)、含水量增加率(percentage increase in leaf water content,RW)、水分饱和亏(leaf water saturation deficit,WSD)、叶绿素含量(chlorophyll content,ChlC)、比叶面积(specific leaf area,SLA)和叶片干物质含量(leaf dry material content,LDMC),分析植物各叶片性状的分布规律及其相互间的关系,并比较不同功能群植物叶片吸水性状的变异特征.模拟结果表明:叶片可以吸收水分,具有利用小量级降水的能力;与其他区域的研究结果相比,研究区50种植物叶片性状值偏小,说明该区域植物能较好地适应贫瘠的环境;叶片性状存在较大的种间差异;不同叶片质地植物的LWUC、RW存在差异,肉质多汁和叶片退化显著高于草质、革质、膜质和纸质者(P<0.05),与WSD相比差异无统计学意义(P>0.05);不同植物生活型相比,地下芽植物的LWUC、RW和WSD均显著高于地上芽植物(P<0.05);不同植物生长型物种的LWUC和RW存在显著差异,半灌木植物的LWUC和RW显著高于乔木/小乔木和1年生/2年生草本(P<0.05),而与WSD相比差异无统计学意义(P>0.05);且不同叶面性状植物的LWUC和RW也有所不同,周身覆毛大于双面覆毛(P>0.05)、单面覆毛(P<0.05)和背被白粉(P<0.05),而与WSD相比差异无统计学意义(P>0.05).总之,叶片吸水对于干旱半干旱地区植物最大限度地利用有限的水资源具有重要的意义.
Summary The rainfall data were collected and the rainfall pattern Was characterized in the arid and semi-arid region of Ningxia. We found that less rainfall events （ 〈 5 mm） occurred higher frequently. Our objective was toinvestigate whether the plant leaf can uptake the rainfall that can not be absorbed by plant roots, and to understand leaf water uptake strategy, the relationship between leaf water uptake capability and plant ecological functional types in the arid and semi-arid region of Ningxia. The leaf water uptake content （LWUC）, percentage increase in leaf water content （RW）, chlorophyll content （CHIC）, leaf water saturation deficit （WSD）, specific leaf area （SLA） and leaf dry matter content （LDMC） of 50 plants were measured, and patterns of leaf traits were investigated to detect their difference among functional groups and relationships between each trait. The correlation coefficients were calculated between each pair of traits. One- way analysis of variance and Fisher＇ s multiple comparison, if applicable, were carried out on means of different ecological functional types, for comparing LWUC, RW and WSD.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2013年第5期565-574,共10页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家重点基础研究发展计划(973计划)前期专项资助项目(2012CB723206)
国家科技支撑计划资助项目(2011BAC07B03)
