Một số đặc điểm hóa lí và động học của lớp trầm tích bề mặt trong các thảm thực vật ngập mặn ven sông Tiền, tỉnh Tiền Giang

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Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ: Khoa học Tự nhiên, 2018

Mô tả vật lý: tr.50

Bộ sưu tập: Metadata

ID: 293708

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Nghiên cứu này được thực hiện để khảo sát các đặc tính hóa lý và động học theo chiều thẳng đứng của trầm tích bề mặt (0–5 cm) trong các thảm thực vật ngập mặn ven sông Tiền, tỉnh Tiền Giang. Các thảm rừng ngập mặn ven sông phân bố từ vùng mặn nhiều (tuyến S1 và S2) đến vùng mặn vừa (tuyến S3 và S4) đến vùng mặn ít (tuyến S5). Ba ô mẫu tiêu chuẩn (10x10 m) trong mỗi tuyến khảo sát được thiết lập dựa trên độ cao của nền rừng (cm + mực nước biển trung bình) và loài thực vật ưu thế. Tổng số 28 mẫu trầm tích được thu thập trong tháng 12/2016 và tháng 4/2017. Sự biến đổi theo mùa của độ pH, thế oxy hóa khử (Eh), độ dẫn điện của dịch chiết bão hòa (ECse), dung trọng, chất hữu cơ trong trầm tích (SOM) và tổng lưu huỳnh (TS) được đo đạc theo các phương pháp tiêu chuẩn. Xu hướng mùa của sự xói mòn và bồi tụ theo chiều thẳng đứng được đánh bằng phương pháp que đánh dấu. Các giá trị ECse và hàm lượng TS cao hơn trong mùa khô và trong những tuyến gần cửa sông (S1, S2 và S3) nhưng các xu hướng này không được tìm thấy đối với thông số pH, Eh và SOM. Trong hầu hết các thảm thực vật ngập mặn ven sông Tiền, độ cao thấp (0–50 cm) là một trong những yếu tố quan trọng ảnh hưởng đến Eh và ECse. Vào mùa mưa, những thay đổi lớn về xói mòn và bồi tụ theo chiều thẳng đứng đã xuất hiện ở các tuyến gần cửa sông.This study was conducted to investigate the physio-chemical properties and vertical dynamic of the surface sediment (0–5 cm) in riparian mangroves along the Tien river, Tien Giang province. The distribution of riparian mangroves located from the polyhaline zone (transect S1 and S2) to the mesohaline zone (transect S3 and S4) and the oligohaline zone (transect S5). Three plots (10x10 m) per transect were set based on the elevation of the mangrove floor (cm + mean sea level) and dominant plants. A total of 28 sediment samples were collected in December 2016 and April 2017. Seasonal variation of pH, redox potential (Eh), electrical conductivity of saturated extract (ECse), bulk density, sediment organic matter (SOM) and total sulfur (TS) were measured in accordance with the standard protocols. Seasonal trends of vertical erosion and accumulation were tested by the tracer stick method. The ECse values and TS concentrations were higher in the dry season and in transects closed to the estuary (S1, S2 and S3) but these trends weren’t found for pH, Eh, and SOM. In most of the riparian mangroves along the Tiền river, low elevation (0–50 cm) was one of important factors affecting the Eh and ECse. In the rainy season, major changes in vertical erosion and acumulation have occurred in the transects near the mouth of the river.

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1. Đọc trực tuyến

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