土壤紧实度对生姜植株衰老的影响

通过测定不同容重土壤中生长的生姜植株的主要生理特性，研究了土壤紧实度与生姜植株衰老的关系.结果表明：随土壤紧实度增大，生姜根系活力降低，叶片硝酸还原酶活性及叶绿素含量下降，光合作用减弱，叶片的电解质渗漏率及MDA含量升高.在生长前期，叶片SOD、POD及CAT活性随土壤紧实度的增加而降低，后期则相反.生姜旺盛生长期，土壤容重为1.20和1.49 g·cm^-3的植株根系活力分别为37.3和28.5 μg·g^-1FM·h^-1，后者较前者降低30.9%，叶片叶绿素含量及光合速率分别降低19.0%和17.9%，而叶片电解质渗漏率及MDA含量则分别提高57.2%和26.3%，表明紧实土壤加速了生姜植株的衰老.

Effects of soil compactness on ginger plant senescence.

Based on the determinations of main physiological parameters of ginger plant grown in different compactness soils, this paper studied the effects of soil compactness on the senescence of ginger plant. The results showed that with the increase of soil compactness, the root activity and the leaf NRase activity, chlorophyll content and photosynthetic rate of ginger plant declined, while the leaf electrolytic leakage and MDA content increased. The activities of leaf SOD, POD and CAT decreased with increasing soil compactness at early growth stage but were in adverse at late growth stage. At vigorous growth stage, the root activity and the leaf chlorophyll content and photosynthetic rate in the soil with a compactness of 1.49 g cm(-3) were 30.9%, 19.0% and 17.9% lower, and the leaf electrolytic leakage and MDA content were 57.2% and 26.3% higher, respectively, compared with those in the soil with a compactness of 1.20 g cm(-3), which indicated that compacted soil could accelerate the senescence of ginger plant.