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OALib Journal期刊
ISSN: 2333-9721
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高山森林溪流非木质残体cd和pb贮量特征
DOI: 10.3724/SP.J.1145.2014.09002, PP. 528-532
Keywords: 水源涵养地,森林溪流,植物残体,重金属
Abstract:
非木质残体是高山森林溪流生态系统的基本组成部分，其分解过程释放的重金属元素通过长期的迁移与沉积等途径汇集到下游水体，从而成为森林生态系统元素输出的主要形式和影响流域水环境安全的潜在因素之一.于2013年8月调查了岷江上游高山森林溪流非木质残体镉（cd）和铅（pb）的贮量及其随溪流特征的变化.结果显示：岷江上游高山森林溪流非木质残体在单位面积集水区的cd贮量为0.863mg/hm2，单位面积溪流的cd贮量为0.249mg/m2；单位面积集水区的pb贮量为9.19mg/hm2，单位面积溪流的pb贮量为2.65mg/m2；岷江上游高山森林溪流非木质残体cd和pb总贮量分布较均匀，与溪流的长度、面积和流量的相关性均不显著，但会影响各组分cd和pb贮量及其所占比例.可见，高山森林溪流非木质残体输出是cd和pb等重金属元素的重要输出过程，这可为进一步研究高山森林―河岸―溪流连续体的重金属元素分配与迁移提供重要的基础数据和新的思路.
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