Camm E L, Harper G J
Department of Forest Sciences, University of British Columbia, Vancouver, B.C., Canada V6T 1Z4.
Tree Physiol. 1991 Oct;9(3):425-31. doi: 10.1093/treephys/9.3.425.
We examined effects of soil temperature on the number of roots produced by white spruce (Picea glauca (Moench.) Voss) seedlings during the first month of growth following 0-30 weeks of storage in darkness at -2 degrees C. After storage, seedlings were planted in pots and placed in a controlled-environment chamber with a constant air temperature of 11 degrees C and a 16-h photoperiod. Water baths were used to keep soil temperature at 3, 7 or 11 degrees C. The number of long roots (> 10 mm) produced was strongly dependent on soil temperature. At soil temperatures of 3 or 7 degrees C, the number of long roots produced was only 11 to 30% that at 11 degrees C. Seedlings that had been stored for 14 weeks and then planted in soil at 11 degrees C produced the greatest number of long roots. For seedlings planted in soil at 11 degrees C, the number of long roots increased with time of storage up to 14-18 weeks and then declined progressively with length of storage. No increase in number of long roots with length of storage up to 18 weeks was evident in seedlings planted in soil at 3 or 7 degrees C. The maximum number of short roots (5-10 mm) was observed in seedlings that had been stored for 17 weeks and then planted in soil at 7 or 11 degrees C.
我们研究了在-2℃黑暗条件下储存0至30周后，土壤温度对白云杉（Picea glauca (Moench.) Voss）幼苗生长第一个月根系数量的影响。储存后，将幼苗种植在花盆中，并放置在空气温度恒定为11℃、光周期为16小时的可控环境室内。使用水浴将土壤温度保持在3℃、7℃或11℃。长出的长根（>10毫米）数量强烈依赖于土壤温度。在3℃或7℃的土壤温度下，长出的长根数量仅为11℃时的11%至30%。储存14周后种植在11℃土壤中的幼苗长出的长根数量最多。对于种植在11℃土壤中的幼苗，长根数量随着储存时间增加至14 - 18周，然后随着储存时间的延长逐渐减少。在3℃或7℃土壤中种植的幼苗，储存长达18周时，长根数量没有明显随储存时间增加。在储存17周后种植在7℃或11℃土壤中的幼苗中，短根（5 - 10毫米）数量最多。
