摘要
在植物生长旺季(七八月份),采用快速称质量法对青海共和盆地主要生态恢复树种垂榆(Ulmus pumila var.pendula)、小叶杨(Populus simonii)、柠条(Caragana korshinskii)、沙棘(Hippophae rhamnoides)、乌柳(Salix cheilophila)、沙柳(Salix psammophila)的蒸腾速率进行测定,探讨其蒸腾耗水规律。结果表明:垂榆、小叶杨、沙棘、沙柳蒸腾速率日进程均为单峰型曲线,柠条和乌柳为双峰型曲线,不同树种日均蒸腾速率由大到小的顺序为柠条、沙柳、乌柳、沙棘、小叶杨、垂榆;各树种不同方位叶片蒸腾速率峰值出现时间存在差异,不同方位叶片日均蒸腾速率由大到小的顺序为南面叶片、西面叶片、东面叶片、北面叶片;小叶杨日蒸腾耗水量可达93.556 kg,垂榆与20年生乌柳日蒸腾耗水量约为小叶杨的40%,灌木树种沙柳、柠条、沙棘耗水量较低。
The experiment was conducted to measure the transpiration rate of six ecological restoration tree species, Ulmus pumi- la vat. pendula, Populus simonii, Caragana [~orshinskii, Hippophae rhamnoides, Salix cheilophila and Salix psammophila with the quick weighing method in Gonghe Basin in July and August when the plants grow vigorously. We revealed the law of their transpiration water consumption. The diurnal changes of transpiration rate of U. pumila var. pendula, P. simonii, H. rhamnoides and S. psammophila show single-peak curves, while C. korshinskii and S. cheilophila present a double- peak curve. The mean transpiration rates of C. korshinskii, S. psammophila, S. cheilophila, 1-1. rhamnoides, U. pumila var. pendula and P. simonii are 7.82, 6.42, 4.68, 4.26, 3.62 and 2.70 μg cm-2 s-1 , respectively. The peak time of transpiration rate of different directional leaves occur at different times, and the order of transpiration rate of different di- rectional leaves is southern leaf 〉western leaf 〉eastern leaf 〉northern leaf. The daily transpiration water consumption of P. simonii is as high as 93 556.75 g, the same index of U. pumila var. pendula and S. cheilophila is about 40% of P. simo- nil. The daily transpiration water consumption of S. psammophila, C. korshinskii and H. rhamnoides is at a low level.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2013年第9期30-33,62,共5页
Journal of Northeast Forestry University
基金
国家"十二五"科技支撑课题(2012BAD16B0105)
中国林业科学研究院重点项目(ZD200907)
关键词
高寒沙区
生态恢复
蒸腾速率
蒸腾耗水量
Qinghai-Tibet Plateau
Ecological restoration
Transpiration rate
Transpiration water consumption
