Ngân sách cation dưới hệ sinh thái nông nghiệp trên đồi ở Meghalaya, Ấn Độ
Tóm tắt
Từ khóa
#meghalaya #ngân sách cation #hệ sinh thái nông nghiệp #độ phì nhiêu của đất #cỏ dạiTài liệu tham khảo
Allen S E, Grimshaw H M, Parkinson J A and Quarmby C 1974Chemical analysis of ecological materials (Oxford: Blackwell Scientific Publication)
Asamoa G K 1980 A survey of nitrogen levels in the major soils of Ghana; inNitrogen cycling in west Africa ecosystems (ed.) T Rosswall (Scientific Committee on Problems of Environment/United Nations Environment Programme, International Nitrogen Unit, Royal Swedish Academy of Sciences, Stockholm) pp 171–179
Buckman H O and Brady N C 1960The nature and properties of soils (New York: Macmillan)
Cowgill U M 1961 Soil fertility and the ancient Maya;Trans. Conn. Acad. Arts Sci. 42 1–56
Mishra B K and Ramakrishnan P S 1981 The economic yield and energy efficiency of hill agro-ecosystems at higher elevations of Meghalaya in north-eastern India;Acta Oecol. (Oecol. Appl.) 2 369–389
Mishra B K and Ramakrishnan P S 1983 Slash and burn agriculture at higher elevation in north-eastern India. I. Sediment, water and nutrient losses;Agric. Ecosyst. Environ. 9 69–82
Nye P H and Greenland D J 1960 The soil under shifting cultivation;Tech. Commun. No. 51 (Harpenden: Commonwealth Bureau of Soils)
Patnaik S 1988Studies of land use and village ecosystem function in the Khasi hills of Meghalaya, Ph.D. thesis, North-Eastern Hill University, Shillong.
Ramakrishnan P S 1984 The science behind rotational bush fallow agriculture systems (jhum);Proc. Indian Acad. Sci. (Plant Sci.) 93 379–400
Ramakrishnan P S 1985 Tribal man in the humid tropics of the north-east;Man India 65 1–32
Ramakrishnan P S, Toky O P, Mishra B K and Saxena K G 1981 Slash and burn agriculture in north-eastern India; inFire regimes and ecosystem properties (eds) H A Mooney, J K Bonnecksen, N L Christensen, J E Lotan and W A Reiners (USDA, Forest Service General, Technical Report No 26) pp 570–584
Ruthenburg H 1976Farming systems in the tropics (Oxford: Clarendon Press)
Sanchez P A (ed.) 1976 inSoil management in multiple cropping systems in properties and management of soils in the tropics (New York: Wiley) pp 478–532
Spencer J E 1966Shifting cultivation in south-western Asia (Berkeley, Los Angeles: University of California Press)
Stromgaard P 1984 The immediate effect of burning and ash fertilization;Plant Soil 80 307–320
Swamy P S and Ramakrishnan P S 1988 Nutrient budget under slash and burn agriculture (jhum) with different weeding regimes in north-east India;Acta Oecol. (Oecol. Appl.) 9 85–102
Toky O P and Ramakrishnan P S 1981a Cropping and yields in agricultural systems in the north-eastern hill regions of India;Agro-Ecosystems 7 11–25
Toky O P and Ramakrishnan P S 1981b Run-off and infiltration losses related to shifting agriculture (jhum) in north-eastern India;Environ. Conserv. 8 313–321