幼龄期红枣根系生物量空间分布特征

Spatial distribution characteristics of root system biomass of Ziziphus jujube in juvenile phase

为了解不同地径红枣根系生物量及其空间分布规律,提高红枣的经营管理水平提供科学依据。采用剖面挖掘法和分层分段取样法,利用WinRHIZO Pro2010a根系分析系统对漫灌条件下幼龄期不同地径红枣根系生物量的空间分布进行了分析。结果表明:水平范围内,不同地径(3、6、9 cm)的红枣分布范围分别为0～200、0～275、0～300 cm,不同地径(3、6、9 cm)的红枣根系生物量70%以上都分布在距树干0～50 cm处;在垂直方向上,3 cm地径的红枣根系生物量随土层深度增加呈先增加后减小的趋势,最大值出现在20～30 cm处;6 cm地径的红枣根系生物量随土层深度增加呈先增加后减小再增加后减小的趋势,出现两个峰值,最大值出现在30～40、70～80 cm处;9 cm地径的红枣根系生物量随土层深度增加呈先减少后增加再减小的趋势,出现两个峰值,最值出现在0～10、100～110 cm处;不同地径(3、6、9 cm)红枣根系生物量随着水平距离的增加而减小,随着地径的增加其分布范围扩大;随着土层深度的增加不同地径红枣根系生物量分布规律也不同。

In order to understand the root system biomass of different ground diameter red jujube and its spatial distribution,improve the management level of the red jujube,provide scientific reference,based on the soil excavation and Stratified Sampling Technique and by using WinRHIZO Pro2010a,the spatial distribution of roots’ biomass of Ziziphus jujube in juvenile phase under irrigation conditions were investigated.In the horizontal direction,the ground diameters of the red jujube(3 cm,6 cm and 9 cm) horizontal distribution range respectively 0～200 cm,0～275 cm,0～300 cm,and more than 70% root biomass distribution of ground diameters(3 cm,6 cm,9 cm) red jujube were in 0～50 cm from the tree trunks.In the vertical direction,the root biomass of 3 cm ground diameter varied with the soil depth first increased and then decreased,the maximum value appeared in 20 cm ～ 30 cm soil depth;the root biomass of 6 cm ground diameter changed with the soil depth first increased then decreased again re-increased and re-decreased,there were two peaks values,the maximum values appeared in 30 cm ～ 40 cm,70 cm ～ 80 cm soil depth;the root biomass of 9 cm ground diameter of varied with the soil depth first decreased then increased and re-decreased,there were two peaks values,the maximum values appeared in 0 cm ～ 10 cm,100 cm ～ 110 cm soil depth.With the increase of the horizontal distance from the roots to the tree trunks,the red jujube roots’ biomasses of different ground diameters decreased,with the increase of the ground diameters the distribution of the roots’ biomasses were expanded.With the increase of soil depth,the red jujube root biomass distribution lows were different.