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选取尖果沙枣1年生幼苗,盆栽于相对含水量不同的土壤中培养30 d,研究尖果沙枣幼苗生物量及部分生理指标的变化。结果表明,土壤相对含水量在50%~55%时,与对照比,幼苗各指标无显著差异,这说明50%~55%的土壤相对含水量是适合尖果沙枣幼苗的生长;土壤相对含水量在35%~40%时,幼苗根冠比和叶绿素a含量明显增高,分别为0.596,35.920 mg/cm2,比对照幼苗分别增高了1.81倍和1.33倍,而其干物质积累率、膜透性、丙二醛含量、脯氨酸含量、叶片水势和叶片相对含水量与对照幼苗相比无显著差异,此时的土壤相对含水量可能是尖果沙枣幼苗能生长的阈值;土壤相对含水量在15%~20%时,幼苗干物质积累率和根冠比仍保持较高水平,而其叶片总重量和整株总生物量大幅度下降,chla/chlb比值也有明显降低,脯氨酸含量剧烈增高,叶片水势降低,叶片相对含水量大幅度下降,在这种低土壤相对含水量条件下,尖果沙枣幼苗虽然受到较严重的伤害,但仍然能够存活。
One-year-old seedlings of Shaji jujube were selected and potted in the soil with different relative water content for 30 days to study the changes of biomass and some physiological indexes of Shatiko jujube seedling. The results showed that there was no significant difference between the relative water content of the soil and the control when the relative water content of the soil was between 50% and 55%, which indicated that the relative water content of 50% -55% of the soil was suitable for the growth of A. przewalskii seedlings. The root-shoot ratio and chlorophyll-a content of seedlings were significantly increased at the water content of 35% -40%, respectively, 0.596 and 35.920 mg / cm2, which were 1.81 and 1.33 times higher than that of the control seedlings respectively. Permeability, malondialdehyde content, proline content, leaf water potential and leaf relative water content were not significantly different from those of control seedlings. The relative soil water content at this time may be the threshold for seedling growth. The dry matter accumulation rate and root / shoot ratio of seedlings remained at a high level when the water content was 15% ~ 20%, while the total leaf weight and total biomass of the seedlings decreased significantly, the ratio of chla / chlb also decreased significantly, The acid content increased sharply, the leaf water potential decreased, and the relative water content of leaves decreased greatly. Under the condition of relative soil moisture content of low soil, the seedlings of Acorus calamus were severely damaged but survived.