草业学报Issue(4)：214-220,7.DOI:10.11686/cyxb20150425
土壤容重对野生香根草幼苗根系形态及其生物量的影响
Effect of soil bulk density on root morphology and biomass of vetiver grass seedlings
摘要
Abstract
Vetiver grass (Vetiveria zizanioides )has an extensive root system and is consequently used world-wide for water and soil conservation.However,soil compaction resulting in high soil bulk density negatively influences root growth.In order to understand the adaptation of vetiver grass to soil compaction,the effects of soil of different bulk density,1.20 g/cm3 (D1 .20 ),1.35 g/cm3 (D1 .35 )and 1.58 g/cm3 (D1 .58 ),on the root mor-phology and biomass of vetiver seedlings were investigated using soil columns.The results showed that shoot and root dry weight,root:shoot ratio,root surface area,root length density and root volume density decreased with increasing bulk density,but that average root diameter increased.High bulk density influenced the spatial distribution of roots;more roots grew in the upper (0-6 cm)and lower (18-24 cm)soil horizons under the D1 .20 and D1 .35 treatments,suggesting that vetiver typically produces a deep root system but that root growth is inhibited by high soil bulk density,confining roots to the upper soil horizon (0-6 cm).The average root diam-eter in the D1 .20 and D1 .35 treatments decreased but increased in D1 .58 with increasing soil depth.It is concluded that vetiver grass could tolerate moderately compacted soil.关键词
土壤容重/野生香根草/根系形态/根系生物量Key words
soil bulk density/wild vetiver (Vetiveria zizanioides )/root morphology/root biomass引用本文复制引用
刘晚苟,李良贤,谢海容,何泳怡,刘金祥..土壤容重对野生香根草幼苗根系形态及其生物量的影响[J].草业学报,2015,(4):214-220,7.基金项目
国家星火计划项目（2012GA780012）和湛江市热带特色资源植物技术开发重点实验室项目（2014A06008）资助。 （）
