关键词: 环境因子, 有机碳分解, 农业土壤, 培养实验, 气候变化

Abstract: The cadmium (Cd) in soil environment has a high toxicity, which not only harms plant growth and development, but also threatens human health. Salicylic acid (SA), a plant growth regulator, can play an important role in inducing plant Cd-resistance. This paper studied the mitigation effects of different concentration (0, 10, 100, and 1000 μmol·L^-1) SA on the Cd toxicity to two H. tuberosus varieties (NY5 and NY2) under various Cd stress (0, 50, and 100 μmol·L^-1). The results showed that exogenous SA could mitigate the Cd toxicity to NY5 and NY2. The SA increased the pigment content, improved the photosynthetic parameters, enhanced the bioconcentration factor (BCF) and translocation factor (TF), and reduced the Cd accumulation in plant organs, but the optimal concentration of SA differed with the varieties and their organs. It was suggested that applying appropriate concentration of CA could effectively enhance the Cd-resistance of the two H.tuberosus varieties.

Key words: Environmental factors, Organic carbon decomposition, Agricultural soils, Incubation experiment, Climate change