夏季高温条件下香根草耐旱性研究

Study on drought tolerance capacity of Vetiveria zizanioides under the condition of high temperature in summer

夏季高温条件下香根草Vetiveria zizanioides耐旱能力很强,在高温干旱条件下停水可持续24～42 d之久。试验研究表明:高温条件下随着受旱时间的推移,地上部生长受到抑制,分蘖下降,株高降低,茎叶含水量下降,叶片受伤害程度变重,同时地下部根系生长也受到抑制,根体积和根生物量几乎不再增加;不同高温条件下香根草的耐旱能力不同,温度高,香根草受伤害就越重、越明显,持续耐旱时间变短,返青复活的可能性变小。

Drought tolerance capacity of Vetiveria zizanioides is much better under high temperature in summer. It can tolerate drought from 24 to 42 days. Results indicate that with time going on under high temperature growth of aboveground parts is restrained, tillers dropping, height declining, water content of stem and leaf falling, leaf being hurt more severely, and underground growth of V. zizanioides is also restrained, volume of V. zizanioides and root biomass of V. zizanioides almost no longer rising. Drought tolerance capacity of V. zizanioides appeared different under different high temperature, and higher the temperature is, the more severe and obvious V. zizanioides gets hurt, shorter drought tolerance duration becomes, and less probability of recovery becomes.