蚯蚓诱导-黑麦草吸收土壤Cd的相关性研究

利用石墨炉(GF-990)原子吸收法,对蚯蚓诱导条件下黑麦草对土壤Cd吸收规律进行了研究.结果表明:(1)在3～6 mg·kg-1的Cd浓度范围内,黑麦草地下部分Cd含量与蚯蚓数量呈极显著正相关(γ=0.8832*～0.9862**),黑麦草地上部分Cd含量与蚯蚓数量的正相关性不显著(γ=0.3455～0.325 4);而土壤Cd含最与蚯蚓数量之间呈显著的负相关性(r=-0.5887～-0.6784*).(2)在相等数最的蚯蚓条件下,随着土壤中Cd浓度增加,黑麦草地上、地下部分Cd的含量均升高.(3)在相同的土壤环境下,蚯蚓数量与蚯蚓体内Cd含量呈极显著负相关(r=-0.982 0**～-0.9916**).

Research on the relevance of earthworms inducing soil Cd2+ absorbed by perennial ryegrass

Through the method of simulating the heavy metal pollution in farmland, the graphite oven (GF-990) atomic absorption was used for analyzing the regulations of the earthworms inducing the soil Cd2+ absorbed by the perennial ryegrass. The result indicated: (1) under the circumstance of the soil Cd2+ density of 3-6 mg x kg(-1), the positive relevance appeared extremely remarkably that the contents of Cd2+ in underground portions of the perennial ryegrass relate to the earthworm quantity (r = 0.883 2-0.986 2), but in the portion above ground the positive relevance did not appear extremely remarkably (r = 0.345 5-0.325 4); And the negative relevance appeared remarkably that the contents of Cd2+ in the soil relate to the earthworm quantity (r = -0.588 7(-) -0.678 4). (2) Under the conditions of isometric number of earthworms, the more the density of Cd2+ in the soil, the more the increase of Cd2+ in both portions under and above ground of perennial ryegrass. (3) Under the same soil environment, the negative relevance appeared that the number of earthworms relates to the contents of Cd2+ in the earthworms (r = -0.982 0(-) -0.991 6).