Is Phytoextraction Efficient for Remediating Phosphorus-Enriched Soils in Mountainous Region? A Case Study of Lake Dianchi Watershed of Southwestern China
- 作者：Kai YanLong ZhangYajie ZhangChangqun Duan
- 会议时间：2013-10-01
- 关键词：Phytoremediation ; P uptake potential ; P-hyperaccumulators ; Dominate species
- 作者单位：Institute of Environmental Sciences and Ecological Restoration & Key Laboratory for Conservation and Utilization of Bio-Resource of Yunnan.Yunnan University,Kunming 650091,China
- 母体文献：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛论文集
- 会议名称：第十一届全国博士生学术年会专题——节能环保与污染防治技术分会场论坛
- 会议地点：成都
- 主办单位：中国环境科学学会
- 语种：chi
摘要
Phosphorus leakage from phosphorus-enriched soils (PES) is a major cause of water degradation worldwide,and phytoextraction is known to be an effective method of remediation.However,it is unclear whether phytoextraction is equally efficient in mountainous regions.We investigated the potential of P accumulation of major plant species in the Lake Dianchi Watershed of Southwestern China.Most of the plants living in PES of this region have high P contents; some have been identified as P-hyperaccumulators,such as Polygonum pubescens,which has the highest leaf P content of 16.88 mg/g.Although the dominate species have relatively low P contents than the P-hyperaccumulators,they still have a higher P uptake potential due to their greater biomass,for example,the P uptake potentials of Alnus nepalensis,Coriaria nepalensis,and Erianthus rufipilus are 46.98,16.91,and 22.78 kg/ha,respectively.While these plants can decrease the total P of thizospheric soil and topsoil,the effects on the total P-pool was not significant.Our results suggest that just phytoextraction may be less efficient in remediating PES in mountainous regions,and it requires further studies about P cycling and native plants to design more effective measures for P immobilization.