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Phân bố thực vật rừng ngập mặn theo gradient ngập nước, photpho và độ mặn trên bán đảo Bragança ở miền Bắc Brazil
Tóm tắt
Bán đảo Bragança, nằm ở miền bắc Brazil, có đặc điểm là có các thủy triều lớn (4 m) và các điều kiện edaphic cụ thể, điều hướng sự phát triển của rừng ngập mặn địa phương. Nghiên cứu này, được tiến hành trong mùa khô, đã đánh giá các mẫu không gian của các loài Rhizophora mangle và Avicennia germinans theo gradient ngập nước. Dọc theo một đoạn transect dài 700 m, các phép đo về kết cấu rừng, độ ẩm của đất, độ mặn của nước trong khe hở, photpho có thể chiết xuất (extr.-P) trong trầm tích và photpho trong lá (leaf-P) đã được thực hiện. Loài A. germinans (100 %) xuất hiện trong khu vực triều cao (HI). A. germinans (59 %) và R. mangle (41 %) đồng xuất hiện trong khu vực triều giữa (MI), trong khi R. mangle (58 %) chiếm ưu thế trong khu vực triều thấp (LI), tiếp theo là A. germinans (37 %) và Laguncularia racemosa (5 %). Phân tích hiệp biến (ANCOVA) chỉ ra rằng độ mặn và độ ẩm đất có sự khác biệt đáng kể giữa các rừng ngập mặn, nhưng không tương quan với tần suất ngập nước (IF). Các giá trị trung bình của extr.-P cũng khác biệt đáng kể trong các rừng ngập mặn và tương quan với IF và leaf-P. Tần suất ngập nước, sự sẵn có của P trong các trầm tích, photpho trong lá và độ mặn giữa các khe đều là những yếu tố quan trọng góp phần vào sự phân bố của các loài cây ngập mặn A. germinans và R. mangle trên bán đảo Bragança.
Từ khóa
#rừng ngập mặn #Bragança #photpho #độ mặn #gradient ngập nướcTài liệu tham khảo
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