摘要
１９９３年生长季（５～１０月）小叶杨的平均蒸腾强度为０．０７６８ｇ·ｇ－１·ｈ－１。蒸腾强度日进程呈现早、晚低，中午高的单峰曲线。并与光照、气温和用对湿度间均具有二次抛物线关系。蒸腾强度季节变化与土壤含水量、光照、气温和相对湿度间的关系则均不明显。小叶杨在生长季的蒸腾耗水量为４０．７ｍｍ，其林分总蒸散量为２９６．１ｍｍ，各占同期降水量２３４．８ｍｍ的１７．３％和１２６％。在生长季降水量仅为多年同期平均量５９．７％的情况下，林地土壤水分收支亏缺量达１０７．６ｍｍ。
The transpiration rate of Populus simonii was 0.0768 g·g-1·h-1±0.0285 from May to October in 1993.The daytime course of transpiration rate from 6:00 to 19:00 showed a pattern of single peak with high value in midday and a low value in early morning and early evening, respectively.The correlation between the daily changes in the transpiration rate and the environmental factors such as light intensity,air temperature and relative humidity was regarded as a quadratic equation, but the relationship between seasonal changes in the transpiration rate and the environmental factors such as soil water content,light intensity,air temperature and relative humidity was not significant.The water consumption through tree transpiration and by the plantation evapotranspiration accounted for 17.3% and 126% of the rainfall of 234.8 mm during the growing season,respectively.There was a water deficit of 107.6 mm in the soil because the rainfall during the growing season accounted for only 59.7% of the average seasonal rainfall of 393.2 mm.
出处
《生态学报》
CAS
CSCD
北大核心
1996年第3期232-237,共6页
Acta Ecologica Sinica
基金
山西省科技发展基金
山西省回国留学人员基金
