关键词: 枝角类, 群落结构, 影响因子, 博斯腾湖

Abstract: By foliar spraying Pb to simulate atmospheric Pb and by adding Pb into soil to simulate soil Pb, this paper studied the accumulation and allocation of atmospheric and soil Pb in maize plants, the relationship between leaf and seed Pb contents, and the contribution rates of atmospheric and soil Pb to seed Pb. After foliar spraying Pb, the Pb concentration in maize organs was in the order of leaf > stalk, root > seed, mainly allocated in leaf; after adding Pb into soil, the Pb concentration in maize organs was in the order of root > stalk > leaf > seed, mainly allocated in root. With the increase of atmospheric and soil Pb concentration, the Pb concentration in the organs increased to different extents. There was a significant positive correlation between the seed Pb concentration and the Pb concentrations in soil and leaf (P<0.01). The toxicity threshold value of Pb added in soil was 118.95 mg·kg^-1. The contribution rates of atmosphere and soil Pb to seed Pb were 53.7% and 46.3%, respectively, suggesting that foliar transfer of atmospheric Pb was the dominant pathway for the Pb intake of maize seeds.

Key words: Cladocera, commutity characteristics, driving factors, Bosten Lake.