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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (7): 23-30.doi: 10.11707/j.1001-7488.20140704

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Absorption and Accumulation Characteristics of Quercus acutissima Seedlings in Different Provenances Under the Combined Pollution of Cd2+ and Pb2+

Wang Jun, Yan Xiaoli, Li Ling   

  1. College of Horticulture and Landscape Architecture, Southowest University Chongqing 400716
  • Received:2013-09-11 Revised:2013-11-12 Online:2014-07-25 Published:2014-07-04
  • Contact: 李凌

Abstract:

This article investigated the absorption and accumulation characteristics of Q. acutissima seedlings of different provenances (Wushan and Wulong, Chongqing and Lingbao, Henan) under the combined pollution of Cd2+ and Pb2+ in the field. The result showed that, under the combined pollution of Cd2+ and Pb2+ in soil, the average contents of Cd2+ and Pb2+ in roots of Q. acutissima seedlings were 0.235-12.460 mg·kg-1, 7.428-370.268 mg·kg-1, the average contents in the stem were 0.115-7.588 mg·kg-1, 4.757-142.960 mg·kg-1, and the average contents in the leaf were 0.072-4.772 mg·kg-1, 2.873-61.923 mg·kg-1. The contents and bioconcentration coefficient of Cd2+ and Pb2+ in the seedlings of the three provenances were in an order of root > stem > leaf. Under the Cd2+ and Pb2+combined pollution, there was an obvious interaction between Cd2+ and Pb2+ for the absorption and accumulation in Q. acutissima seedlings. Pb2+ promoted the accumulation of Cd2+ in each organ of the seedlings. Cd2+ promoted the accumulation of Pb2+ in the root, and inhibited Pb2+ to accumulate in aboveground part. The accumulation and transport capacities of Cd2+ were greater than that of Pb2+ in the seedlings. The seedlings of Lingbao,Henan provenance could be applied to repair the heavily polluted soil by Cd2+, while the seedlings of Wushan,Chongqing provenance could be applied to repair the moderately polluted soil by Pb2+.

Key words: Quercus acutissima, Cd2+, Pb2+, combined pollution

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