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为了研究兴安落叶松播种苗在出苗期、生长初期和速生期所需要的最佳土壤水分能量水平及影响生长的上、下限值,使用张力计控制3～4个土壤水分能量(土壤水吸力)水平等级(处理)。结果说明在出苗期对场圃发芽率、发芽势、平均发芽速度和 L/H 比的最佳土壤水分能量水平是土壤水吸力为10～20kPa;当土壤水吸力为50～73.3kPa 时,就严重影响出苗;当土壤水吸力低于10kPa 时,对苗木根系产生不利影响。在生长初期最佳土壤水分能量水平是土壤水吸力为30～40kPa;当土壤水吸力为10～20kPa 或50～73.3kPa 时,就明显影响苗木生长。在速生期对苗、地径、根系,生物量生长最佳的土壤水分能量水平是土壤水吸力为10～20kPa;当土壤水吸力为50～73.3kPa时,则影响苗木生长
In order to study the optimum soil water energy level and the upper and lower limits of growth of Larix principis-rupprechtii sowing seedlings at seedling, early growth and fast-growing period, three to four soil moisture energies (soil water suction ) Level (Processing). The results showed that the best soil water energy level at field seedling germination rate, germination potential, average germination rate and L / H ratio was 10 ~ 20kPa at seedling emergence stage and 50 ~ 73.3kPa when soil water suction was at seedling stage Seriously affecting the emergence; when the soil water suction less than 10kPa, nursery stock root adversely affected. In the early stage of growth, the best soil moisture energy level is the soil water suction is 30 ~ 40kPa; when the soil water suction is 10 ~ 20kPa or 50 ~ 73.3kPa, it obviously affects the seedling growth. Soil water energy at the fastest growing stage of seedling, diameter, root system and biomass growth was 10 ~ 20kPa. When soil water suction was 50 ~ 73.3kPa, the seedling growth was affected