摘要
为明确草本植物根系对土壤水分性质的影响,以香根草〔Vetiveria zizanioides(Lin.)Nash〕、百喜草(Paspalum natatum)、狗牙根〔Cynodon dactylon(L.)Pers.〕和紫花苜蓿(Medicago sativa L.)为研究对象,用WinRHIZO(Pro.2004C)根系分析系统对根系进行扫描,用SPSS 18.0对根系、土壤物理性质指标、土壤持水量进行相关分析。结果表明,4种草本植物的根长密度随土壤深度的增加而减小,分布规律可用指数函数来描述;香根草和紫花苜蓿的根系主要分布在0—20cm土层,百喜草和狗牙根的根系则集中在0—10cm土层;随土壤深度的增加,土壤的总孔隙度、非毛管孔隙、贮水能力和饱和持水量逐渐减小,土壤容重则逐渐增大;根系主要是通过0.5mm<L(根系直径)≤1mm和1mm<L≤2mm径级来实现对土壤水分性能的改良。
To investigate the effects of herbs＇ root systems on soil water properties, the root systems of veti- ver[Vetiveria zizanioides （ Lin. ） Nash], bahia grass （Paspalum natatum ）, bermuda grass [ Cynodon dac- tylon （L.） Pers. ] and alfalfa（Medicago sativa L. ） were scanned by WinRHIZO, and the correlations be- tween these root systems and soil physical properties and soil water holding capacity were analyzed by SPSS18.0. Results showed that the root length density of herbs decreased as soil depth increased, which can be simulated by an exponential function. Roots of vetiver and alfalfa were mainly distributed in the 0-20 cm soil layer, but roots of bahia grass and bermuda grass were concentrated in the 0-10 cm soil layer. Soil po- rosity, non-capillary porosity, water capacity and saturated water holding capacity decreased, but soil bulk density increased as soil depth increased. The improvement of soil moisture was mainly realized by roots of diameters in the ranges of 0.5 mm〈L≤l mm and 1 mm〈L≤2 mm （L stands for root diameter）.
出处
《水土保持通报》
CSCD
北大核心
2013年第1期81-86,91,共7页
Bulletin of Soil and Water Conservation
基金
中央高校基本科研业务费专项资金"三峡库区草本植物根系的固土抗蚀效应研究"(XDJK2010C046)
国家自然科学基金"植物篱配置模式对三峡库区面源污染控制机理研究"(40971166)
国家科技支撑计划项目"坡地埂-路-沟-池工程配套技术集成示范"(2011BAD31B03)
基于产学研的生态环境类研究生创新型培养模式构建(JG2010005)
西南大学生态学重点学科"211工程"3期建设项目
关键词
草本
根长密度
土壤物理性质
土壤持水量
herb
root length density
soil physical property
soil water holding capacity
