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《Ecology and Environmental Sciences》 2010-12
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Effects of simulated acid rain on seedling growth and allelopathic potential of invasive alien species Bidens pilosa L.

WANG Ruilong,WENG Jie,SONG Yuanyuan,HU Lin,SU Yijuan,ZHANG Hui,ZENG Rensen Key Laboratory of Ecological Agriculture;Ministry of Agriculture//Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions//Institute of Tropical and Subtropical Ecology,South China Agricultural University,Guangzhou 510642,China  
Bidens pilosa L.,an invasion exotic weed,has caused substantial damage to ecosystem in southern China,which is also an acid precipitation area.Effects of simulated acid rain(SAR) with different pH on the seed germination,seedling growth and allelopathic potential of B.pilosa were evaluated in laboratory.The results showed that the germination rate of B.pilosa was increased in SAR treatment at pH 5.6 and 4.0.SAR at pH 4.0 significantly stimulated the seedling growth of B.pilosa,while SAR at pH 2.5 inhibited the seedling growth.SAR at pH 4.0 and 2.5 enhanced the allelopathic potential of aqueous leaf leachates of B.pilosa on the tested plants.These results indicate that B.pilosa can adapt the acid precipitation in southern China,and acid rain might accelerate further invasion of B.pilosa through growth stimulation and enhanced allelopathic potential.
【Fund】: 国家自然科学基金青年科学基金项目(3100026030870390);; 广东省科技计划项目(2008A030101008;2008B021500001);; 华南农业大学校长基金项目(4100-k09128)
【CateGory Index】: S451
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