摘要
该文采用BP3400精密天平和Lico--6400便携式光合系统等仪器对北京6个主要城市绿化树种的耗水量及耗水速率在不同干旱胁迫下的日变化状况进行了比较研究.结果表明,在干旱胁迫下,大多数树种都迅速减少了蒸腾耗水,苗木耗水量日变化规律的单峰型逐渐变得不明显,峰值均出现在10:00—12:00时间段.在中等干旱胁迫下,油松、侧柏、黄杨、白蜡、丁香、国槐的白天耗水量分别比正常情况下降了14.7%、6.8%、8.8%、5.2%、5.5%和23.4%.在严重胁迫下,所有树种的耗水量所占比例都不到正常情况下的10%;阔叶树种的耗水速率明显大于针叶树种,在受到轻度干旱胁迫时下降的幅度最大,比正常水分下的减少了一半以上,在中度干旱胁迫时,各树种的耗水速率只有正常情况下的15%~40%.
Daily changes of transpiration rate of six main city-green tree species in Beijing and water consumption status in different water potential were studied by using Lico-6400 and BP3400 and press chamber etc. Results showed that the rules of peak value appeared between ten o’clock and fourteen. The daily water-consumption amounts of six species were respectively reduced by 14.7%,6.8%,8.8%,5.2%,5.5% and 23.4%. The transpiring water consumption rates of broadleaved tree species were far more bigger than conifer...
出处
《北京林业大学学报》
EI
CAS
CSCD
北大核心
2006年第S1期32-37,共6页
Journal of Beijing Forestry University
基金
"863"国家高新技术项目(2002AA2Z4281)
国家自然科学基金项目(30070637)
北京林业大学省部共建森林培育与保护教育部重点实验室"北京城市绿地水分经济生态的研究"项目(JD100220535).
关键词
耗水量
耗水速率
日变化
干旱胁迫
water consumption amount
water consumption rate
daily variation
drought stress
