河流重新连接对沿海湿地的循环的影响
Lee Potter1, Peter Mates1, John R White1
1Department of Oceanography and Coastal Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA; Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA.
The Science of the total environment
|March 26, 2025
概括
路易斯安那州路易斯安那州路易斯安那州路易斯安那州路易斯安那州
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 沿海生态 沿海生态
背景情况:
- 路易斯安那州沿海湿地面临严重的土地损失,原因是密西西比河堤隔离沉积物和营养流.
- 这种脱节阻碍了沼泽的积累和生态系统的健康.
- 沿海总体规划提出了河流分流以恢复连接.
研究的目的:
- 在河流重新连接之前,在巴拉塔里亚流域建立基线 (P) 动态.
- 为了将P动态与经历自然河流连接的区域进行比较.
- 预测河流重新连接对沿海P循环的影响.
主要方法:
- 在沼泽和开水沉积物中分析平衡P度 (EPC) 和可溶性反应 (SRP).
- 在土壤和河流沉积物中量化总 (TP) 和其分量 (有机残留物,Fe/Al矿物).
- 管理的转水区和未经管理的河流连接之间的P动态的比较.
主要成果:
- 沼泽和开放水域沉积物EPC比密西西比河SRP低.
- 在沼泽土壤中,总P值高于开水沉积物.
- 有机残留P占沼泽和开放水域土壤的主导地位,而Fe/Al结合P在河流沉积物中占主导地位.
结论:
- 河流的重新连接将使主导的土壤P形式从有机转变为Fe/Al-bound.
- 这种转移可能会通过铁的减少增加内部P负荷.
- 增加P的可用性可能会导致开放水域的藻类繁殖,并改变植被区的P吸收.
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