四合木(Tetraena mongolica)是西鄂尔多斯高原特有的珍稀濒危植物。通过室内模拟试验,分析了土壤含水量(5%、10%、15%、20%、25%、30%)、沙埋厚度(0、0.5、1、2、3 cm)及其交互作用对四合木种子萌发和出苗的影响,为四合木的繁育及保护提供科学依据。结果表明:四合木种子萌发的最适宜土壤含水量为20%,发芽率最大为81.33%。四合木种子出苗适宜0.5 cm以下的浅层沙埋,最适宜覆沙厚度为0.5 cm,出苗率最大为73.33%。当覆沙厚度超过2 cm时,四合木种子不出苗。土壤含水量和沙埋厚度对四合木种子的出苗率均有显著的影响(P<0.05)。当土壤含水量为20%,沙埋厚度为0.5cm时,四合木种子的出苗率最大、出苗速率最快。
Tetraena mongolica is a rare and endangered plants which is only found in Western Ordos Plateau of Inner Mongolia. The study used the method of indoor simulation experiments to discuss the influence of soil water content (5%, 10%, 15%, 20%, 25%, 30%), sand burial depth (0, 0.5, 1, 2, 3 cm) and their interaction on the seed germination and seedling emergence of T. mongolica. It will provide a scientific basis on breeding and protection for T. mongolica.The results showed that:The best optional soil water content for T. mongolica seeds germination was 20% at which the germination rate is up to 81.33%. T. mongolica seed is suitable for shallow sand burial depth under 0.5 cm, and the best optional seed covered sand burial depth was 0.5 cm at which the seed emergence rate surpassed 73.33%.When the seed covered sand burial depth was more than 2 cm, the seeding emergence did not occur. Soil water content and sand buried depth both had significant influence on the emergence rate of the T. mongolica (P<0.05).When the soil water content was 20%,and the seed covered sand depth was 0.5 cm,the seed emergence rate of T. mongolica was the maximum.
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