不同相对湿度下几种屋顶绿化景天植物耐热性研究

Study on the Heat Resistance of Several Roof Greening Sedum Plants Growing in Different Relative Humidity

景天植物已在我国居住区屋顶绿化实践中广泛应用,但品种比较单一;并且应用中发现,景天植物在高湿热的南方地区越夏困难。为了筛选出更多适合南方高湿热气候的屋顶绿化景天品种,并为今后屋顶绿化植物选择提供依据。以反曲景天、花叶垂盆草、佛甲草、银纹垂盆草、蓝叶松塔景天、中华景天、红叶景天等7种景天植物为试材,测定叶片相对含水量(RWC)、电解质渗出率、过氧化氢酶(CAT)、超氧化物歧化酶(SOD)活性等指标,研究了在不同相对湿度下,高温胁迫对试验材料相应的生理生化指标的影响,以期筛选出对高湿高温胁迫耐受能力较强的景天品种。结果表明:不同相对湿度下,佛甲草、银纹垂盆草、反曲景天、花叶垂盆草等4个品种在高温胁迫条件下具有较好的生长表现。

Sedum has been widely applied in Chinese residence roof greening practice,but the categories of Sedumis single,moreover,in practice,it is hard for Sedumto live through summer in high humid south area.To select more roof greening Sedum which could live in high humid south area and provided foundation for the future selection of roof greening Sedum.In contrast of Santolina chamaecyparissus,taking the seven Sedum plants of Sedum reflexum,S.sarmentosumcv,S.lineare,S.sarmentorsum ‘Variegatum＇,S.reflexumcv,S.hispanicum var.minus and S.spurium‘Voodoo＇as test materials,using the index determination method of RWC,electrolyte leakage rate,CAT activity and SOD activity,it was researched on high temperature stress efforts on the relative physiological and biochemical indexes of the test materials,under the condition of different relative humidity,in order to find specical Sedum who had strong capbility to tolerate the high temperature stress.