Effects of Simulated Extreme Stony Desertification on the Spatial Distribution of Dalbergia Odorifera Root System

doi:10.14088/j.cnki.issn0439-8114.2018.05.016

Abstract

Abstract: The thesis discussed the spatial distribution of Dalbergia odorifera seedling root system in simulated stony desertified soil （fully stony） by using refined whole root excavation method. The result showed that,in the fully stony substrate,the root-cap ratio of D. odorifera seedling increase. The distribution of root biomass in two different substrates were different in any direction except north（P<0.05）. In both substrates, when depth increased, root biomass of D. odorifera seedling increased first and then decreased. And the maximum biomass in two substrates appeared both from the depth of 10 cm to 15 cm. In stony soil,there were significant differences between root biomass from the depth of 10 cm to 15 cm and root biomass from the depth of 0 cm to 5 cm and from 15 cm to 20 cm（P<0.05）. However, in loam,root biomass had no significant difference in different depth. For D. odorifera with diameter less than 3 mm,there were significant difference between root biomass in stony soil and that in loam. For D. odorifera with diameter less than 0.5 mm, root biomass in stony soil was high than that in loam. Therefore, D. odorifera could change the distribution of root biomass and increase the proportion of thin-root to better adapted stony soil.

Key words: Dalbergia odorifera, root biomass, diameter, spatial distribution

CLC Number:

NI Zhou-you, YANG Zhen-de, YANG Chang-ru, XIAO Mei, YU Shu-zhong. Effects of Simulated Extreme Stony Desertification on the Spatial Distribution of Dalbergia Odorifera Root System[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(5): 67-70.

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