持续高温天气对盛果期枣树茎流的影响

Effect of Continuous High Temperature on Jujube Sap Flow at Full Bearing Age in Xinjiang

采用Dynamax公司生产的TDP植物茎流传感器和HOBO小气候站,于2015年对阿克苏地区温宿县盛果期‘灰枣’在持续高温(7月17至7月26日)天气条件下的茎流量变化进行测定,将数据与高温天气前期(7月2至7月11日)后期(7月27日至8月5日)的枣树茎流量变化进行比较,并将高温阶段的茎流变化与气象因子相结合进行分析。结果表明:高温前期、高温期、高温后期3个时期10d茎流总量为286 331g、295 828g、251 055g,高温期比高温前期10d茎流总量多9 497g,比高温后期10d茎流总量多44 773g。晴天影响茎流的主导环境因子为太阳辐射,相关系数0.887(P<0.01),高温天气和阴天影响茎流的主导环境因子为空气温度,相关系数分别为0.939、0.917(P<0.01)。可见,对于主要是由于热带高压并非太阳辐射引起高温天气,应采取针对降低空气温度的有效措施,避免植物缺水造成损伤。

TDP plant stem flow sensor and the HOBO microclimate manufactured by Dynamax Company were used to measure the change of jujube sap flow under continuous high temperature at full bearing age in Wensu county in Aksu area duirng the period of July 17 to 26in 2015.We compared the jubube sap flows at the early stage of high temperature period（July 2to 22）and at later stage of high tempreture period（July 27 to August 5）,and combined with meteorological factors,we analyzed change of sap flow at period of high temperature.The results showed that,the tendays＇ total stem flow was 286 331 g,295 828 g,251 055 respectively at early stage of high temperature period,stage of high temperature and later stage of the high temperature.The sap flow was 9 497 g more at the period of high temperature compared with the 10 days of early stage of high temperature,and it was 44 773 g more than that of later 10 days of high temperature.The dominant environmental factors affecting the stem flow in clear wheather was solar radiation,the correlation coefficient was 0.887（P0.01）.Air temperature correlation coefficient was 0.939,0.917respectively（P0.01）at high temperature and cloudy weather,which was the dominant environmental facotor to affect stem flow.For high temprature,it was caused mainly by tropical high pressure,but not caused by solar radiation,effective measures for reducing air temperature should be taken to avoid plant being damaged by shortage of water.