辽南地区越橘根系分布特征

调查了7a生越橘在辽南地区棕壤条件下根系分布特征。结果表明:(1)5个越橘品种根幅为50～70cm,水平分布主要在0～50cm范围内;(2)根系生物量以高丛越橘、半高丛越橘较大,矮丛越橘较小;不同径级根系生物量占总生物量的比例以1～3mm的根系最大,其次为≤1mm的根系,≥3mm的根系所占比例较小;(3)康维尔、北村和斯卫克的根长密度较大,北陆和美登较小;不同径级根系根长密度占总根长密度的比例≤1mm根系最大,其次为1～3mm的根系,≥3mm的根系所占比例较小;(4)5个越橘品种根系生物量和根长密度垂直分布深度在30～40cm以内,主要分布在0～20cm土层中,其中康维尔和北村集中分布在0～10cm土层中,美登集中分布在10～20cm土层中,北陆和斯卫克在0～20cm土层内分布相对较为均匀。

Characteristics of Root System of Blueberry in South of Liaoning Province

Root distribution characteristics of five blueberry cultivers in brown soil area were examined.The results showed that(1)root range of 5 blueberry cultivars was 50 to 70 cm,centralized in 0~50 cm,(2)the root biomasses of high-bush blueberry and half high-bush blueberry were high,the root biomass of low-bush blueberry was low,the root biomass of the roots with diameters of 1~3 mm was the highest,diameter <1 mm ranked the second,diameter>3 mm was the lowest;(3)the root length densities of the cultivars of Coville,Northcountry and Brunswick were high,and low for the cultivars of Northland and Blomidon was lesse;the density of the roots with diameter <1 mm was the highest,diameter between 1~3 mm ranked second,and diameter>3 mm was the lowest;(4)the root biomass and root density of 5 blueberry cultivars distributed in 30~40 cm soil layer,mostly in 0~20 cm soil layer,among them,the roots of Coville and Northcountry centralized in 0~10 cm soil layer,in 10~20 cm soil layer for Blomidon,and in 0~20 cm soil layer for Northland and Brunswick with uniform distribution.