宁夏黄土丘陵区4个退耕树种耗水量研究

林木耗水量和环境供水量相平衡是干旱区造林的基本依据,林木耗水研究对了解其生理特性和造林规划有重要意义。在宁夏南部黄土丘陵区采用热脉冲植物茎流计和快速称质量法测定了主要造林树种山桃、山杏、柠条和沙棘的耗水量。结果表明:山桃、山杏、沙棘、柠条年耗水量分别为594.19、271.13、24.88和20.82 kg,日耗水量分别为3.30、1.51、0.14和0.12 kg;不同树种蒸腾耗水过程具有相似的变化过程,即正午是日蒸腾最强的时间,7、8月是耗水量最大的月份。

Water Consumption of 4 Tree Species Moving Out of Agriculture in Loess Hilly Region in Ningxia Hui Autonomous Region

Balance between tree water consumption ＆ environment water supply is the basic rule of forestation. Tree water consumption research is very important for learning tree＇ s physiological characteristics and afforestation planning. The heat pulse sap flow gauges and quick weighing method were used to determine the water consumption of Prunus armeniaca, Prunus davidiana, Hippophae rhamnoides ＆ Caragana korshinskii. Result shows that the yearly water consumption of Prunus armeniaca, Prunus davidiana, Hippophae rhamnoides ＆ Caragana korshinskii are 594.19,271.13,24.88 ＆ 20.82 kg, respectively; daily water consumption of Prunus armeniaca, Prunus davidiana, Hippophae rhamnoides ＆ Caragana korshinskii are 3.30,1.51,0.14 ＆ 0.12 kg, respectively. The process of transpiration of different species show similar trends, which is higher at noon in one day and largest in July and August in a year.