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比较研究了不同栽培密度对薄荷生长策略及光合特性的影响。结果表明:(1)随着密度的升高,单株的株高、茎粗、分枝数、单叶面积、叶片厚度等下降;(2)提高栽培密度时,薄荷的光合色素含量、光合面积、净光合速率均降低,而PSII的最大光化学效率不变;(3)高密度下,单株的根、茎、叶及总生物量积累下降,而群体的生物量积累变化不明显,但地下部分的生物量分配比例均显著增加。进一步分析表明密植会通过降低薄荷单位面积的色素含量而导致光合速率下降;栽培密度提高时薄荷通过增加根生物量比来优先竞争矿质营养。
The effects of different planting densities on the growth strategies and photosynthetic characteristics of peppermint were studied. The results showed as follows: (1) The plant height, stem diameter, branch number, single leaf area and leaf thickness decreased with the increase of density; (2) The photosynthetic pigment content, photosynthesis Area and net photosynthetic rate decreased, while the maximum photochemical efficiency of PSII remained unchanged. (3) Under high density, the accumulation of root, stem, leaf and total biomass decreased while the accumulation of biomass did not change obviously The proportion of biomass in the underground part increased significantly. Further analysis showed that close planting reduced the photosynthetic rate by reducing the pigment content per unit area of peppermint. When the planting density increased, peppermint preferentially competed for mineral nutrition by increasing the ratio of root biomass.