Hình 7.21. Nồng độ nitrat trong các mẫu suối tại Đông Bear Brook ( í
đợc cải thiện với 16,8 kg N/ha.năm bắt đầu ngμy thứ 730 th t ở Tây Bear Brook (đờng nét liền) bắt đầu tăng đều đặn từ khi đ ợng nitơ nitrat xấp xỉ 15% lợng 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 đợc nhữ thử ng m có phạm v
Dờng
i rộng lớn nhằm để kiểm tra lại các mô h ợng nhỏ trong tổng lợng
cung cấp. Nó chỉ ra những điều cần thiết cho ứu lμ: cần phải hiểu biết
nhiều v
ảnh hởng 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 hởng
tiêu c n
7.8 Kết luận
Trầm tích khí quyển có thể ảnh hởng 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 dới nớc. Nhập lợng tới hạn đợc phát triển để bả
trồng vμ rừng khỏi những ảnh hởng 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 lu
Steven Norton, Steven Kahl, Charles Driscol tc μ James Szydlik. Một phần quỹ để nghiên cứu đến từ Phòng thí nghiệm nghiên cứu môi trờng 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 đợc đa 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 lợng qu μ đã đợc 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 đợc theo dõi kỹ lỡng. (adsbygoogle = window.adsbygoogle || []).push({});
u vực bao gồm sự vận
o vệ ao hồ, đất đích ang đợ 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 nớc ba tra lại các mô hình vμ đ hái.
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về đ u khiển vực ngời mμ cung cấp thông tin vμ dữ liệu phù hợp ba l, John Aber, Myron Mi
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