贡嘎山冷杉林带草海子小流域土壤及湖泊沉积物中磷的形态及迁移特征
Soil and lake sediment phosphorus fractions and migrating in a small Abies forested watershed, Gongga Mountain, Southwest China
查看参考文献14篇
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文摘
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磷（P）是控制水体生态系统生产力的重要元素，了解陆地与水体间P的迁移特征，是了解控制水体生态系统中P有效供给的重要途径。本研究选择青藏高原东缘贡嘎山海拔2800 m左右峨眉冷杉林带中一小湖泊——草海子及其流域，通过对流域内土壤、湖泊沉积物中P的形态组成分析，探讨流域内P的形态组成及其迁移特征。结果表明，草海子流域内土壤成土母质中的磷以Ca-P为主，表层土壤中的磷以Al、Fe结合态为主，占总磷的49%~80%，而湖泊沉积物中Al、Fe结合态P下降到46%左右。在成土作用及植物吸收的过程中P由土壤剖面下部向上迁移，迁移的主要形态为树脂提取态（或称可交换态，R-P），而R-P还是由陆地向水体迁移的主要形态P。土壤的Al、Fe结合态P难以释放转化，因此少有随地表径流迁移向湖泊。 |
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其他语种文摘
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Phosphorus (P) is often the critical limiting nutrient controlling the productivity of aquatic ecosystem. Understanding the linkages between terrestrial and aquatic P dynamics is essential to defining the mechanisms governing P availability. We used P fractionation techniques to investigate the P fractions and its migrating in a Abies forested watershed，at elevation about 2800 m asl, Gongga Mountain, Southwest China. The dominant P fraction is aluminum (Al) and ferrum (Fe) combined fraction, which accounts for 49% to 80% of total P in the surface soil, while in lake sediment Al and Fe combined fractions account for 46%. During the pedogenesis and plant assimilation, P is migrated from the bottom of soil profile upward. R-P (Exchangeable P) is the dominant fraction for migrating from bottom upward, as well as from terrestrial soil to water. Al and Fe combined P is difficult to be decomposed so that it is seldom been transported by the runoff from the terrestrial soil to lake. |
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来源
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地球环境学报
,2013,4(1):1208-1214 【扩展库】
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关键词
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磷
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形态
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迁移
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土壤
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贡嘎山
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地址
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中国科学院水利部成都山地灾害与环境研究所, 中科院山地表生过程与生态调控重点实验室, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1674-9901 |
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学科
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环境污染及其防治 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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文献收藏号
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CSCD:4960071
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