Effects of soil temperature on biomass and carbohydrate allocation in Scots pine (Pinus sylvestris) seedlings at the beginning of the growing season
Effects of soil temperature on biomass and carbohydrate allocation in Scots pine (Pinus sylvestris) seedlings at the beginning of the growing season
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DOI：
10.1093/treephys/21.7.465
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发表时间：
2001-05-01
期刊：
影响因子：
4
通讯作者：
Lehto, T
中科院分区：
文献类型：
--
作者：
Domisch, T;Finér, L;Lehto, T
研究了土壤温度对樟子松（Pinus sylvestris L.）在生长季节开始时的幼苗。一年生苏格兰松幼苗在5、9、13和17 ℃的土壤温度和17 ℃的空气温度下生长9周。监测萌芽日期、芽和根的伸长。本赛季和前赛季根，茎和针叶的生物量测定在3周的时间间隔。淀粉，蔗糖，葡萄糖，果糖，山梨糖醇和肌醇的浓度进行了测定，在所有的植物：除新的根部分。芽的爆发和根伸长的发病时间不受土壤温度的影响。在第9周，高度生长减少，根延伸生长在5 ℃的土壤温度下比在更高的土壤温度下少得多。幼苗总生物量在5 ℃土壤温度处理中最低，在13 ℃处理中最高，但在13 ℃和17 ℃下生长的幼苗之间的总生物量没有统计学显著差异。随着土壤温度的升高，地下生物量显著增加，导致生物量向地下部分的分配略高。在处理中，根长在土壤温度为17 ℃时最大。老根含糖率不受土壤温度的影响，而新叶含糖率随土壤温度的升高而增加。幼苗各部位淀粉含量以17 ℃生长的幼苗最低。土壤温度对幼苗淀粉含量没有影响。
We studied effects of soil temperature on shoot and root extension growth and biomass and carbohydrate allocation in Scots pine (Pinus sylvestris L.) seedlings at the beginning of the growing season. One-year-old Scots pine seedlings were grown for 9 weeks at soil temperatures of 5, 9, 13 and 17 degreesC and an air temperature of 17 degreesC. Date of bud burst, and the elongation of shoots and roots were monitored. Biomass of current and previous season roots, stem and needles was determined at 3-week intervals. Starch, sucrose, glucose, fructose, sorbitol and inositol concentrations were determined in all plant: parts except new roots. The timing of both bud burst and the onset of root elongation were unaffected by soil temperature. At Week 9, height growth was reduced and root extension growth was much less at a soil temperature of 5 degreesC than at higher soil temperatures. Total seedling biomass was lowest in the 5 degreesC soil temperature treatment and highest in the 13 degreesC treatment, but there was no statistically significant difference in total biomass between seedlings grown at 13 and 17 degreesC. In response to increasing soil temperature, belowground biomass increased markedly, resulting in a slightly higher allocation of biomass to belowground parts. Among treatments, root length was greatest at a soil temperature of 17 degreesC. The sugar content of old roots was unaffected by soil temperature, but the sugar content of new needles increased with increasing soil temperature. The starch content of all seedling parts was lowest in seedlings grown at 17 degreesC. Otherwise, soil temperature had no effect on seedling starch content.