tailieunhanh - Remote Sensing and GIS Accuracy Assessment - Chapter 8

Quốc gia đầu tiên của Australia Kiểm kê khí nhà kính (NGGI) cho rằng thanh toán bù trừ nông nghiệp có thể đại diện cho nhiều như 1 / 4 phát thải khí nhà kính (DOEST 1994). Đất nông nghiệp Che Thay đổi dự án (ALCC) được thực hiện bởi Cục nông thôn Khoa học (BRS) và tám cơ quan nhà nước của chính phủ Úc tài liệu tỷ lệ phá rừng và tái trồng rừng (1990/1991-1995) cho mục đích dự toán cải thiện khí nhà kính lượng khí thải (Barson et al, 2000). Trong nghiên cứu này, thảm thực vật thân gỗ đã được. | CHAPTER 8 An Independent Reliability Assessment for the Australian Agricultural Land-Cover Change Project 1990 91-1995 Michele Barson Vivienne Bordas Kim Lowell and Kim Malafant CONTENTS Discussion and Acknowledgments .113 References .113 INTRODUCTION Australia s first National Greenhouse Gas Inventory NGGI suggested that agricultural clearing could represent as much as a quarter of Australia s total greenhouse gas emissions DOEST 1994 . The Agricultural Land Cover Change ALCC project was undertaken by the Bureau of Rural Sciences BRS and eight Australian state government agencies to document rates of deforestation and reforestation 1990 1991-1995 for the purpose of improving estimates of greenhouse gas emissions Barson et al. 2000 . For this study woody vegetation was defined as all vegetation native or exotic with a height 2 m and a crown cover density of 20 McDonald et al. 1990 . This was the definition of forest agreed to by state and commonwealth agencies for Australia s National Forest Inventory NFI and the definition used for Australia s NGGI NGGI 1999 . The definition includes vegetation usually referred to as forest 50-100 crown cover as well as woodlands 20-50 crown cover and plantations silvaculture operations but not open woodlands where crown cover is 20 . Woodlands occupy X 106 ha followed by forests X 106 ha and plantations X 106 ha NFI 1998 . The project documented both increases and decreases in woody vegetation over the period 1990 1991-1995 for the intensive land-use LU zone Figure . Decreases or clearing were defined as the removal of woody vegetation resulting in a crown cover of 20 . Increases in woody vegetation usually due to tree planting result in a crown cover that exceeds 20 . The 105 2004 by Taylor Francis Group LLC 106 REMOTE SENSING AND GIS ACCURACY ASSESSMENT Figure Study area for the agricultural land-cover change for