中国结缕草属植物(Zoysia spp.)地下部分分布和形态类型的多样性

通过对分布于我国的结缕草属(ZoysiaWilld.)54份种质地下部分特点的研究,发现其地下茎分布都在15cm土层内,其中大部分在5cm深度的土层范围内(97.23%),很少达到15cm(0.29%);不定根一般可分布到40cm左右,但表层15cm内分布了不定根总量的81.62%,其下的25cm土层中分布的不定根只占不定根总量的18.38%。地下茎在10～15cm、不定根在30～40cm土层中各性状的变异都比较显著。相关分析表明,随着纬度的升高,地下茎在较深的土层(5～15cm)中分布密度有增加的趋势,而伴随着纬度升高不定根分布密度趋小。根据地下茎和不定根分布的特点,可将我国结缕草属植物地下部分划分为3大类型,即浅茎密根型、中茎密根型和深茎浅根型。

Morphology and distribution diversity of rhizome and adventitious root of Zoysia spp. in China

Based on traits of rhizome and adventitious root of 54 accessions of \%Zoysia \%Willd. in China, this paper revealed that the rhizomes distributed within 15 cm depth soil, 97.23% of which distributed in 5 cm depth soil and only 0.29% located below 15 cm depth. Adventitious root distributed within 40 cm depth, but 81.62% of which distributed in 15 cm depth, and only 18.38% distributed in left soil layers, variability of 10-15 cm depth rhizome and 30-40 cm depth adventitious root were obvious. Correlation analysis showed that density of rhizome tended to rise in 5-15 cm depth and density of adventitious root tended to lower with the latitude increasing. Based on cluster analysis of rhizome and adventitious root characteristics, these accessions could be divided into 3 groups: shallow rhizome dense root; moderate depth rhizome dense root; deep rhizome shallow root.