侧柏、油松幼苗水分胁迫试验

在太行山石灰岩中山区,以侧柏、油松2年生苗为研究对象,选择地膜、石块等材料覆盖,进行水分胁迫试验,每天3次用TDR测定土壤含水量,记录苗木严重萎蔫时的时间。结果表明:地膜覆盖盆植侧柏苗各层土壤温度均高于对照,而在生态垫覆盖下均低于对照;两种覆盖处理均能明显增加侧柏苗的土壤体积含水量,且延长侧柏苗存活天数10 d以上;覆盖处理盆植油松苗各层土壤温度与对照间均无显著差异;地膜和生态垫覆盖下油松苗的土壤体积含水量显著高于对照,石块覆盖下的土壤体积含水量与对照间无显著差异;地膜、生态垫、石块覆盖的油松幼树存活天数明显长于对照,以地膜覆盖延长的时间最多;侧柏苗和油松苗的致死土壤体积含水量分别为6.7%和7.8%。

Water Stress Experiments of Platycladus orientalis and Pinus tablaeformis Young Trees

By taking two-year-old Platycladus orientalis and Pinus tabulaeformis mulched by plastic film, stone, etc. as the research objects, the water stress experiments were conducted in calcareous rock area in middle Taihang Mountain. The soil water content was measured three times a day by using time domain reflectometry (TDR), and the wilting time was recorded. The results are as follows: the mulching treatments could decrease soil water consumption, increase soil water-holding time of effective water, prolong the survival time of sapling under water stressed condition; the least soil water content for sapling survive were 6.70% and 7.80% for Platycladus orientalis and Pinus tabulaeformis, respectively, and forest planting could not be carried out when soil water content was lower.