EFFECT OF ROOT/LEAF TEMPERATURE DIFFERENTIALS ON ROOT/SHOOT RATIOS IN SOME PASTURE GRASSES AND CLOVER
EFFECT OF ROOT/LEAF TEMPERATURE DIFFERENTIALS ON ROOT/SHOOT RATIOS IN SOME PASTURE GRASSES AND CLOVER
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DOI：
10.1093/oxfordjournals.aob.a084308
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发表时间：
1969-01-01
期刊：
影响因子：
4.2
通讯作者：
DAVIDSON, RL
中科院分区：
文献类型：
--
作者：
DAVIDSON, RL
12个牧草品种在相同的空气环境中生长，但有5个恒定的土壤温度范围从5到35 °C，以确定根温对每单位重量的叶子的根的重量（R/S比）的影响。该比值在种内变化2 ~ 8倍，用最大叶产量来表示各树种的最适土壤温度，发现R/S比值在最适土壤温度时最低，在最适土壤温度以上和以下时逐渐升高，只有少数例外。对R/S比值的实验操作表明，光合产物的分配受光合作用和根系吸收的相对速率的控制，成反比关系：根质量×吸收速率（吸收）α叶质量×光合速率（光合），在其他环境因子相同的情况下，根系相对重量与土壤温度偏离最适温度的位移量成正比，呈曲线关系。
Twelve pasture species were grown in the same aerial environment, but with five constant soil temperatures ranging from 5 to 35 °C, to determine the influence of root temperature on the weight of roots per unit weight of foliage (R/S ratio). This ratio varied by a factor of 2 to 8 within species.Using maximum yield of foliage to indicate the optimum soil temperature for each species, it was found that the R/S ratio was lowest at the optimum soil temperature, and was progressively higher at soil temperatures above and below the optimum with only slight exceptions. This experimental manipulation of R/S ratios suggests that the partitioning of photosynthate is controlled by the relative rates of photosynthesis and root absorption, by inverse proportion:Root mass x rate(abeorption)α Leaf mass x rate(photosynthesis).When other environmental factors were uniform, the relative weight of roots tended to be proportional to the displacement of soil temperature from the optimum for each of the 12 species, the relationship being curvilinear.