贵州草海氮磷分布特征及沉积物释放通量估算

生态学杂志

贵州草海氮磷分布特征及沉积物释放通量估算

韩志伟¹,张水¹,吴攀^1*,曹星星^1,2,涂汉^1#br#

(¹贵州大学资源与环境工程学院，贵阳 550025； ²贵州科学院，贵阳 550001)

出版日期:2017-09-10 发布日期:2017-09-10

Distribution characteristics of nitrogen and phosphorus in waters and release flux estimation in the sediment of Caohai basin, Guizhou.

HAN Zhi-wei¹, ZHANG Shui¹, WU Pan^1*, CAO Xing-xing^1,2, TU Han^1#br#

(¹College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China; ^2Guizhou Academy of Sciences, Guiyang 550001, China).

Online:2017-09-10 Published:2017-09-10

摘要/Abstract

摘要：

通过对草海丰水期和枯水期水体、表层沉积物及周边河流水体系统的样品采集与测试分析，阐明丰水期和枯水期氮磷在草海水体的空间分布特征，分析表层沉积物中氮磷的释放通量的空间分布特征，识别沉积物的“源”和“汇”特征。结果表明，两个水文期大部分入湖河流的总氮和总磷浓度高于出湖河流，湖水氮磷浓度受外源输入影响较明显；丰、枯两期挺水植物区水中氮磷浓度高于沉水植物区，且沿主要水流方向逐渐降低；丰水期水沉积物界面水中氮磷浓度高于表层水体，枯水期该特征不明显。枯水期沉积物中总氮的释放通量范围为5.244～362.506 mg·m^-2·d^-1，呈现出“源”的特征；沉积物中总磷释放通量范围为-3.081～3.009 mg·m^-2·d^-1，在挺水植物区表现为“汇”，在沉水植物区表现为“源”，内源释放也不可忽视。

关键词: 海陆梯度, 高程分异, 生态等级指数, 时空演变, 中国大陆沿海地区

Abstract:

Water and sediment samples were collected from Caohai basin. The distribution of nitrogen and phosphorus concentrations in water and the release characteristics of nitrogen and phosphorus from the sediment were analyzed. The results showed that total nitrogen and total phosphorus concentrations of most inflow river water were higher than those of outflow river water during wet and dry seasons. Affected by the exotic input, total nitrogen and total phosphorus concentrations of the waters in emerged plants zone were higher than that of submerged plants zone, which were decreasing along the water flow direction. In wet season, the concentrations of total nitrogen and total phosphorus in sediment interface water were higher than those of surface water, while such a pattern was not obvious in dry season. The release flux of total nitrogen from sediment was between 5.244 and 362.506 mg·m^-2·d^-1, which was considered as “source” of total nitrogen. The release flux of total phosphorus from sediment ranged from -3.081 to 3.009 mg·m^-2·d^-1, which was considered as “sink” in emergent plants zone and “source” in submerged plants zone, indicating that endogenous release is an unneglectable source of nitrogen and phosphorus in Caohai waters.

Key words: spatiotemporal changes, ecological grade index, China’s coastal areas, land-sea gradient, elevation differentiation

韩志伟1,张水1,吴攀1*,曹星星1,2,涂汉1. 贵州草海氮磷分布特征及沉积物释放通量估算[J]. 生态学杂志.

HAN Zhi-wei1, ZHANG Shui1, WU Pan1*, CAO Xing-xing1,2, TU Han1. Distribution characteristics of nitrogen and phosphorus in waters and release flux estimation in the sediment of Caohai basin, Guizhou.[J]. cje.

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