[Distribution characteristics and seasonal dynamics of Cu and Zn in shrub-marsh plants in mountainous areas of northeast China].

The study on the distribution, accumulation, and seasonal dynamics of Cu and Zn in shrub-marsh plants Salix rosmarinifolia, Salix pentandra, Carex caespitosa and Carex schmidtii in mountainous areas of Northeast China showed that the Cu concentration in test plants varied from 6 to 12 mg x kg(-1), and its distribution was in the sequence of root > stem > leaf in S. rosmarinifolia and S. pentandra, and of stem > leaf > root in C. caespitosa and C. schmidtii, suggesting that Cu was mainly accumulated in the root of shrubs and the stem or leaf of Carex. Shrubs and Carex had less difference in their Cu concentration. The Zn concentration in test plants was 30-250 mg x kg(-1), and its distribution was in the sequence of leaf > stem > root in S. rosmarinifolia and S. pentandra, and of root > stem > leaf in C. caespitosa and C. schmidtii, indicating that Zn was mainly accumulated in the leaf of shrubs and the root of Carex. Shrubs had a higher Zn concentration than Carex. The accumulation coefficient of Zn in the organs of S. rosmarinifolia and S. pentandra was higher than 1.45, suggesting a good Zn-accumulation ability of these plants. The Cu and Zn concentrations in the aboveground parts of the four plants were higher during the initial growth period and then fluctuated to decrease with season, while those in roots were all higher both in the initial and in the late growth periods.