不同母质红壤下干旱胁迫对草本植物生长的影响

Effects of Drought Stress on Growth of Herbaceous Plants in Red Soil with Different Parent Materials

以南方红壤区常见的草本植物刺芒野古草、鹧鸪草、假俭草、宽叶雀稗、狗牙根、白三叶为供试植物,设计空白对照、复水、干旱胁迫、保水剂4种人工模拟自然干旱胁迫处理,研究了红砂岩红壤和第四纪红壤条件下干旱胁迫对6种草本植物生长的影响。结果表明:不同供试植物在4个处理条件下,苗高生长量、地上生物量、地下生物量和地下/地上生物量比率均表现为第四纪红壤>红砂岩红壤;在干旱胁迫环境下,假俭草、刺芒野古草、鹧鸪草、宽叶雀稗、狗牙根均表现出较强的适应性,以刺芒野古草最佳。研究结果可为植被恢复先锋植物的选择提供科学依据。

Six types of herbaceous plants including Arundinella setosa,Eriachne pallescens,Eremochloa ophiuroides,Paspalum wettsteinii,Cynodon dactylon and Trifolium repens in red soil region of southern China were used as test materials.Four experimental treatments of control,rehydration,drought stress and water retention agent were conducted in this study.Artificial simulation of natural drought stress experiments was set to study the effects of drought stress on the growth of six herbaceous plants in red soil with different parent materials(quaternary red soil and sandstone red soil).The results showed that the seedling height growth,above-ground and below-ground biomass and below-ground/above-ground biomass ratios of different herbaceous plants in quaternary red soil were higher than those in sandstone red soil under all treatments.Arundinella setosa,Eriachne pallescens,Paspalum wettsteinii and Cynodon dactylon had strong adaptability to drought stress,of which the adaptability of Arundinella setosa could get optimum result.The research results can provide scientific basis for the selection of pioneer plants for vegetation restoration.