地温调控对高温胁迫下剪股颖草坪土壤温度、草坪质量和根系生长的作用  

Effects of ground temperature regulation on the soil temperature,quality,and root growth of bentgrass turf under heat stress

作　　者：范志浩 宋桂龙[1] 陈佳宝 唐斌 窦玮豪 张亚楠 李富翠 陈雨峰[1] 韩烈保[1] 贾辰雁 FAN Zhihao;SONG Guilong;CHEN Jiabao;TANG Bin;DOU Weihao;ZHANG Ya’nan;LI Fucui;CHEN Yufeng;HAN Liebao;JIA Chenyan(Turfgrass Research Institute,Beijing Forestry University,Beijing 100083,China;Inner Mongolia M-Grass Ecology And Environment(Group)Co.,Ltd.,Hohhot 010010,Inner Mongolia,China)

机构地区：[1]北京林业大学草坪研究所,北京100083 [2]内蒙古蒙草生态环境(集团)股份有限公司,内蒙古呼和浩特010010

出　　处：《草业科学》2022年第1期57-65,共9页Pratacultural Science

基　　金：国家自然基金面上项目(31971770)。

摘　　要：为研究地温调控对草坪高温胁迫的缓解作用,在地下20 cm处设置3个地温调控处理,调控温度分别保持在27、24和21℃,以正常生长环境下的匍匐剪股颖(Agrostis stolonifera)草坪为对照(CK),探讨地温调控对草坪土壤温度、草坪质量和根系生长的影响。结果表明:在高温季节,地温调控可以显著降低土壤温度(P<0.05),缓解高温胁迫下草坪质量和生长情况下降的趋势,调控温度在24℃以下效果较明显,调控温度为21℃效果最好;在21℃调控处理下,5和20 cm土层土壤温度分别较CK处理降低了2~4.5和5~7℃,草坪色泽和归一化差异植被指数(NDVI)分别提高了17.8%和28.2%,地下生物量增加了58.2%,总根长、根表面积、根体积增加幅度最大可达84.5%、97.8%和112.7%,根系活力最高增加了46.9%。因此,地温调控处理可以有效缓解高温胁迫下剪股颖草坪生长下降的趋势,可以作为剪股颖草坪植物应对高温胁迫的有效措施,以21~24℃为适宜调控温度。To explore the mitigation effects of ground temperature regulation on turf heat stress,three different treatments were set at the soil depth of 20 cm with 27,24,and 21℃.The bentgrass turf maintained under normal growth conditions was used as the control,and the effects of temperature on turf soil temperature,quality,and root system were explored.During the high-temperature season,ground temperature regulation significantly reduced turf soil temperature(P<0.05),alleviated the decline in turf quality,and recovered root growth under heat stress.Moreover,these mitigation effects reached statistical significance when the temperature was maintained below 24℃(P<0.05),with the best cooling effect observed at 21℃.Soil temperature at 5 and 20 cm was reduced by respectively 2~4.5 and 5~7℃under the 21℃cooling treatment compared with that under the control treatment.Additionally,under the same treatment,the turf color and normalized difference vegetation index were increased by respectively 17.8%and 28.2%.Likewise,the underground biomass,total root length,root surface area,root volume,and root vitality of the turf were increased up to 58.2%,84.5%,97.8%,112.7%,and 46.9%,respectively.Therefore,ground temperature regulation effectively alleviated the decline in bentgrass turf growth under heat stress,and this strategy can effectively improve bentgrass survival during high-temperature seasons.Specifically,maintaining the ground temperature at 21~24℃is the most suitable mitigation strategy.

关 键 词：剪股颖 土壤降温 草坪生长 地下生物量 根系形态 根活力 

分 类 号：S688.4[农业科学—观赏园艺]