摘要
榆树(Ulmus pumila)疏林是浑善达克沙地特有的且最稳定的固沙植被。为了研究榆树疏林蒸腾速率的主要影响因子,以浑善达克沙地榆树为研究对象,测定其蒸腾速率及影响因子的日变化,通过相关性分析、偏相关性分析、通径分析等,考察了影响因子对榆树蒸腾速率的影响。结果显示:光合有效辐射和空气温度日变化呈单峰型曲线;二氧化碳浓度日变化范围较小;空气相对湿度和风速日变化趋势基本一致,均为早晨较高,之后逐渐下降;榆树蒸腾速率日变化在7、9月份为单峰型曲线,8月份为双峰型曲线。结论表明:榆树蒸腾速率的主要影响因子为大气温度和光合有效辐射,且蒸腾速率与影响因子间的回归方程为Y1=-13.652+0.004 X1+0.397 X2+0.018 X3-4.140 X4+0.142 X5。
Ulmus Pumila woodland is a specific and the most stable fixing vegetation in Otinday Sandy Area .This paper analyzes the diurnal change of transpiration rate and its affecting factors of the Ulmus Pumila woodland in Otinday Sandy Area .Correlation analy‐sis ,partial correlation analysis and path analysis are applied to show the effect of affecting factors on their transpiration rate .The re‐sults show that the range of carbon dioxide concentration is smaller ;the diurnal change of photosynthetic active radiation and air tem‐perature vary in a single-peak curve ;the variation of air relative humidity and wind speed are similar ,i .e .higher in morning and then declining gradually ;the diurnal change of transpiration rate of the Ulmus Pumila varies in a single-peak curve in July and September , but a double-peak curve in August .So it can be concluded that the transpiration rate of Ulmus Pumila is mainly affected by air tem ‐perature and photosynthetic active radiation ,and the regressive equation among transpiration rate and affecting factors is Y 1 =- 13 .652 ＋ 0 .004 X1 ＋ 0 .397 X2 ＋ 0 .018 X3 - 4 .140 X4 ＋ 0 .142 X5 .
出处
《节水灌溉》
北大核心
2014年第11期6-9,共4页
Water Saving Irrigation
基金
国家自然科学基金(51149006)
内蒙古自治区自然科学基金(2013MS0607)
关键词
浑善达克沙地
榆树
蒸腾速率
影响因子
通径系数
Otinday Sandy Area
Ulmus Pumila
transpiration rate
affecting factors
path coefficients
