Metal pollution in relation to mass outbreaks of Dendrolimus punctatus Walker on Pinus massoniana Lamb.in China |
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作者姓名: | Pekka Nuortev LI Tiansheng Esa Tulisalo HONG Peizhi |
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作者单位: | Department of Limnology and Environmental Protection;Helsinki University;Caloniuksenkatu 6 C 64;FIN-00100;Helsinki University;Finland;,Research Institute of Forest Ecology, Environment & Protection, Chinese Academy of Forestry, Beijing 100091, China;,Laboratory, Department of Limnology and Environmental Protection, Box 27, FIN-00014, Helsinki University, Finland;,Forest Pest Control Station of Guiyang City, GuizhouProvince, China |
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摘 要: | Insects with their ecological superpower have enormous capacity to transform small pollution damage in forests to full scale calamities. Acid rain resulting from extensive coal burning is the chief pollutant in China. Acid rain activates from soil deposits toxic metals, which are transferred to trees and further to insects eating them. We studied the levels of the toxic Cd, its antagonists Zn and Cu, and acid rain indicators Fe and Mn in the forest pest moth Dendrolimus punctatus Walker (Lepidoptera:Lasiocampidae) in variously polluted Pinus massoniana Lamb forests in China. The highest density of D. punctatus, as well as the highest Cd levels developed in the moderately polluted forests. Possibly Cd had there broken down the pest resistance of the pines. The paradoxical coexistence of high Cd level and elevated population density of the pest seems to result from the high accumulation of Cd in its ichneumonid parasitoid. In the most heavily polluted forests the Cd level in needles was low, possibly because the strong acid rain had washed away most of the Cd deposit in the soil. It existed there no D.punctatus population. Absence of pest insects from the most heavily polluted areas is a common phenomenon.
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关 键 词: | metal pollution Dendrolimus punctatus Walker Pinus massoniana Lamb. China |
收稿时间: | 1999-01-18 |
修稿时间: | 1999-03-08 |
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