Lên biểu đồ vμ cung cấp tổng l‡

Một phần của tài liệu Các quá trình vật lý và hóa học của hồ chương 7 (Trang 41)

Hình 7.21. Nồng độ nitrat trong các mẫu suối tại Đông Bear Brook ( í

đ‡ợc cải thiện với 16,8 kg N/ha.năm bắt đầu ngμy thứ 730 th t ở Tây Bear Brook (đ‡ờng nét liền) bắt đầu tăng đều đặn từ khi đ‡ ợng nitơ nitrat xấp xỉ 15% l‡ợng amôni sunfat thêm vμo

Việc cải tạo ở Tây Bear Brook xác nhận tầm quan trọng của kế hoạch dμi hạn,

ng hiệ

những giả thiết. nh‡ rừng đang bị suy giảm nitơ rất dễ rμng, hơn cả những dự đoán, mặc dù nó chỉ chiếm một l‡ đ‡ợc nhữ thử ng m có phạm v

D‡ờng

i rộng lớn nhằm để kiểm tra lại các mô h ợng nhỏ trong tổng l‡ợng

cung cấp. Nó chỉ ra những điều cần thiết cho ứu lμ: cần phải hiểu biết

nhiều v

ảnh h‡ởng đến l 6.8

kg/ha/năm không quá y định trung bình cho vùng có thể xắp xếp lμ khoảng 20 - 30 kg/ha/năm. Bởi vì mức sμn của nitơ vμ axít ở Tây Bear Broo lμm cho cuộc cải tạo lμ một cuộc thử nghiệm thμnh công. thử nghiệm còn đang tiếp tục vμ vì vậy những ảnh h‡ởng

tiêu c n

7.8 Kết luận

Trầm tích khí quyển có thể ảnh h‡ởng đến các đặc tính sinh hoá của hồ. Các phản ứng sinh địa hoá trong những vùng rừng có l

chuyển của các cặp electron cùng với sự vận chuyển prôton gây ra những thay đổi trong trầm tích tạo nên sự cân bằng về axit - bazơ của hệ sinh thái trên mặt đất vμ d‡ới n‡ớc. Nhập l‡ợng tới hạn đ‡ợc phát triển để bả

trồng vμ rừng khỏi những ảnh h‡ởng của những trầm tích axít vμ trầm tích

đ c n

gây ô nhiễm từ n ồm

sự điều khiển l‡ ạt tới

một sự hiểu biết về bảo vệ vμ quản lý hệ sinh t

Lời cảm ơn. Những quan niệm trên đây đã có tác dụng do sự cộng tác thú vị với

James J. Morgan vμ Laura Sigg. Với sự cộng tác trong công tr iề l‡u

Steven Norton, Steven Kahl, Charles Driscol tc μ James Szydlik. Một phần quỹ để nghiên cứu đến từ Phòng thí nghiệm nghiên cứu môi tr‡ờng EPA của Mỹ vμ từ hợp đồng với Đại học Quốc gia New York, Syracuse. Không có sự xác nhận do các cơ quan cấp cho sẽ đ‡ợc đ‡a đến kết luận.

Tμi liệu tham khảo

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nghiên c hơn nữa ề các bể hữu c

‡ợng nitơ bão phải lμ ơ cố định, cái m hoμ trong hệ s lớn vμ l‡ợng qu μ đã đ‡ợc tích luỹ trong r inh thái. Tỉ lệ ứng dụng ừng vμ lμ 1

k lμ trong giới hạn quy định,

ực dμi hạ với rừng sẽ đ‡ợc theo dõi kỹ l‡ỡng.

‡u vực bao gồm sự vận

o vệ ao hồ, đất đích ang đ‡ợ ghiên cứu bởi

ơi khác vμo. S u vực lμ rất c chính phủ để qu ự nghiên cứu về ần thiết để kiểm ản lý sự thải ra của nhữn quy mô tập trung n‡ớc ba tra lại các mô hình vμ đ hái.

ình nghiên cứu g chất

o g

về đ u khiển vực ng‡ời mμ cung cấp thông tin vμ dữ liệu phù hợp ba l, John Aber, Myron Mi

o gồm: hell v

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