喀斯特区3种灌木根系构型及其生态适应策略

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Root architecture and ecological adaptation strategy of three shrubs in karst area
HUANG Tongli,TANG Lixia,CHEN Long,ZHANG Qiaoyan
( College of Forestry,Guizhou Uห้องสมุดไป่ตู้iversity,550025,Guiyang,China)
摘要: 为探究喀斯特地区灌木植物的根系构型及适应策略,采用逐步挖掘法分析黔中喀斯特区 3 种灌木的根系拓 扑指数、根系连接长度、根系分支率,并探讨根系水平分布特征及根系弯曲特点。结果表明: 1) 对 3 种灌木喀斯特 有限生存空间采取相似的适应策略,拓扑指数 TI 均接近于 1,即均趋近于鱼尾形分支结构。2) 3 种灌木总根系连 接长度均较长,具体表现为双荚决明( 597. 17 cm) > 多花木蓝( 589. 23 cm) > 火棘( 567. 53 cm) ,但树种之间差异不 显著( P > 0. 05) ; 此外,除三、四级根系连接长度之间无显著差异( P > 0. 05) 外,其余各级根系连接长度之间均有极 显著差异( P < 0. 01) 。3) 总根系分支率表现为火棘( 2. 314) > 多花木蓝( 1. 747) > 双荚决明( 1. 541) ,即火棘的根 系分支能力最强。4) 3 种灌木根系在水平方向上分布不均,且存在不确定性。此外,灌木根系为寻求生长空间还表 现出独特的缠绕弯曲形态。 关键词: 喀斯特地区; 灌木; 根系构型; 适应策略 中图分类号: Q142. 9 文献标志码: A 文章编号: 2096-2673( 2019) 01-0089-06 DOI: 10. 16843 / j. sswc. 2019. 01. 012
收稿日期: 2018-05-07 修回日期: 2018-07-11 项目名称: 贵州省科技计划项目“喀斯特区边坡绿化树种的筛选与示范”( 黔科合支撑[2016]2612 号) ; 贵州省专业学位研究
第 17 卷 第 1 期 2019 年 2 月
中国水土保持科学 Science of Soil and Water Conservation
Vol. 17 No. 1 Feb. 2019
喀斯特区 3 种灌木根系构型及其生态适应策略
黄同丽,唐丽霞,陈 龙,张乔艳
( 贵州大学林学院,550025,贵阳)
Abstract: [Background]Ecological environment in the karst area is very fragile and the soil erosion is serious. Plant roots play an important role in controlling shallow landslides,consolidating soils,and preventing soil erosion. Root architecture is one of the important factors affecting the function of soil fixation. Therefore,studying the unique root architecture of shrubs in this area is of great significance for evaluating the soil and water conservation effects of plant roots. [Methods]In this study,the whole plant root system was excavated by stepwise mining,and the diameter,height,crown width,root diameter, root length and root angle were measured. The topological index,root connection length and root branching rate of three shrub roots in Karst area of central Guizhou were analyzed,and the horizontal distribution characteristics and root bending characteristics of roots were discussed. [Results] 1 ) The three shrubs adopt similar adaptive strategies to the limited living space of karst,and the topological index TI is close to 1,that is,they all tend to the herringbone structure. 2) The total root connection length of the three shrubs was longer,which was characterized by Cassia bicapsularis ( 597. 17 cm) > Indigofera amblyantha( 589. 23 cm) > Pyracantha fortuneana( 567. 53 cm) ,but the difference between the species was not significant ( P > 0. 05 ) . In addition there was no significant difference between the root connection lengths of the tertiary and fourth roots ( P > 0. 05 ) ,and there was a extremely significant
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