外源钙对沙地樟子松幼苗生长及生理特性的影响

Effects of Exogenous Calcium on the Growth and Physiological Characteristics of Pinus Sylvestris var. Mongolica Seedlings in Sandy Land

    摘要
  • 摘要: 为探讨沙地樟子松幼苗生长存在的最适钙浓度，本研究测定分析了不同外源钙浓度下沙地樟子松幼苗生长、光合参数、叶绿素荧光参数、水分利用效率等相关指标变化。本次试验的试验材料为三年实生沙地樟子松幼苗，设有6个钙浓度梯度，每个梯度设置6个重复处理，进行土培控制试验。结果表明：沙地樟子松幼苗叶片中植物钙含量随着钙浓度升高而增加，其叶片植物钙含量比未进行施钙处理的沙地樟子松幼苗大幅提升；施钙可以促进沙地樟子松幼苗的生长，最适钙浓度范围为50 ~ 100 mg kg−1，当浓度超过其最适值后，随着钙浓度的增加沙地樟子松幼苗生长量与生物量均出现下降趋势；施钙可以促进沙地樟子松幼苗光合色素的合成，使植株的光合参数提高，并促进可溶性糖和淀粉的积累。钙浓度在50 ~ 100 mg kg−1之间时，影响效果最为显著；施钙影响沙地樟子松幼苗叶绿素荧光特性，在钙浓度达到400 mg kg−1时，PSⅡ最大光化学效率小于0.8，产生胁迫现象；添加钙处理后沙地樟子松幼苗的水分利用效率得到显著提高，当钙浓度达400 mg kg−1时，水分利用效率达到最高值。综上可知，沙地樟子松幼苗最适钙浓度保持在50 ~ 100 mg kg−1之间，过高或过低的钙浓度都会抑制沙地樟子松幼苗的生长发育。

     

    Abstract: In order to explore the optimal calcium concentration for seedling growth of Pinus sylvestris var. Mongolica in sandy land, the three-year seedlings of Pinus sylvestris var. Mongolica were used into a soil culture trial with 6 calcium concentration gradients by 6 replications for each treatment, to investigate the changes of relevant indices such as seedling growth, photosynthetic parameters, chlorophyll fluorescence parameters, water use efficiency of Pinus sylvestris var. Mongolica seedlings in sandy land under different exogenous calcium concentrations. The results showed that the plant calcium content in the leaves of Pinus sylvestris var. Mongolica seedlings increased with the increase of calcium gradient, which was significantly more than that without calcium treatment. Calcium application promoted the growth of Pinus sylvestris var. Mongolica seedlings in sandy land with the optimal calcium concentration rangeing from 50 to 100 mg kg−1. When over the optimal value, the growth and biomass of Pinus sylvestris var. Mongolica seedlings in sandy land showed downward trends with the increase of calcium concentration. Calcium also enhanced the synthesis of photosynthetic pigment of Pinus sylvestris var. Mongolica seedlings, increased the photosynthetic parameters of the plant, and promoted the accumulation of soluble sugar and starch. The most significant effects of those indices affected by the calcium concentrations were between 50-100 mg kg−1. Moreover, calcium application affected the chlorophyll fluorescence characteristics of Pinus sylvestris var. Mongolica seedlings. When the calcium concentration reached 400 mg kg−1, the maximum photochemical efficiency of PSⅡ was less than 0.8, causing the stress phenomenon. In addition, calcium application significantly improved the water use efficiency of Pinus sylvestris var. Mongolica seedlings as well, showing the highest water use efficiency was obtained at the calcium concentration of 400 mg kg−1. These results suggested that the optimal calcium concentration of Pinus sylvestris var. Mongolica seedlings in sandy land had to maintain at 50-100 mg kg−1. Too high or too low calcium concentration would inhibit the growth and development of Pinus sylvestris var. Mongolica seedlings in sandy land.

     

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