摘要
对库布齐沙漠2，3，4年生人工梭梭，4年生人工沙枣、柠条以及天然植物油蒿，进行了蒸腾速率与相关环境因子气温、大气相对湿度和0～160cm土层的土壤含水率的测定。结果表明：不同植物种其蒸腾特征各异；气温和大气湿度与蒸腾速率日进程的变化趋势总体表现出随着气温的升高（或大气相对湿度的降低），蒸腾速率亦呈升高的趋势。几种植物蒸腾速率的季节变化总体表现出随着土壤含水率的增加而增加，降低而降低。蒸腾速率与土壤含水率季节变化的相关性因植物种而异。几种植物中油蒿10～100cm层土壤含水率和2年生梭梭、3年生梭梭0～130cm层土壤含水率与蒸腾速率呈直线相关，相关系数分别为0．811，0．694和0．955（P=0．05），而沙枣、柠条和4年生梭梭的蒸腾速率与土壤含水量的相关性不显著。这表明，在天然降水条件下，植物蒸腾作用的季节变化趋势不仅受土壤水分的影响，还与植物自身生长节律和生理调控等其它因素有关。
Evapotranspiration rate of four plants 2, 3, 4-year-old Haloxylon ammodendron, Carragana korshinskii, 4-year-old Elaeagnus anugustifolia and regional Artemisia ordosica） in Kubuqi desert were measured in different seasons. In addition,air temperature,soil water,relative moisture and so on were measured at the same time. As a result, transpiration rates vary greatly with the change of seasons for different species. With the increase of temperature, the evapotranspiration rate is increased, however, the seasonal changes of evapotranspiration rate are dependent on the changes of soil moisture. The relationship between evapotranspiration rate and seasonal soil water content are different in plants. Transpiration rate was correlated in linearity with soil water content of different layers. The correlation of linearity were observed to Artemisia ordosica and 2, and 3-year Haloxylon ammodendron, the correlation coefficient are 0.811, 0. 694 and 0. 955 （P= 0.05 ） respectively. In the contrast, there are no significant correlation between soil moisture and evapotranspiration rate of Elaeagnus anugustifolia, Carragana korshinskii and 4-year-old Haloxylon ammodendron. These results suggest that under the natural condition, the seasonal changes of evapotranspiration rate is not only dependant on the effluence of edaphic moisture but also the other factors such as growth rhythm of plant itself and physiological regulation etc.
出处
《水土保持研究》
CSCD
北大核心
2007年第1期184-186,189,共4页
Research of Soil and Water Conservation
基金
内蒙古农业大学博士基金(K73629)
关键词
沙漠植物
蒸腾作用
环境响应机制
desert plant
evapotranspiration
environment responding mechanism
