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Net ecosystem exchange (NEE) of C varies greatly among Arctic ecosystems. Here, we show that approximately 75 per cent of this variation can be accounted for in a single regression model that predicts NEE as a function of leaf area index (LAI), air temperature and photosynthetically active radiat...


Shaver, G.R.Rastetter, E.B.Salmon, V.Street, L.E.Weg, M.J. van deRocha, A.Wijk, Mark T. vanWilliams, M.[Pan-Arctic modelling of net ecosystem exchange of CO2]Pan-Arctic modelling of net ecosystem exchange of CO2

This paper examines the effects of wildlife tourism-based payments for ecosystem services (PES) on poverty, wealth inequality and the livelihoods of herders in the Maasai Mara Ecosystem in south-western Kenya. It uses the case of Olare Orok Conservancy PES programme in which pastoral landowners h...


Osano, P.M.Said, Mohammed YahyaLeeuw, Jan deNdiwa, Nicholas N.Kaelo, D.Schomers, S.Birner, R.Ogutu, J.[Why keep lions instead of livestock? Assessing wildlife-tourism based payment for ecosystem services involving herders in the Maasai Mara, Kenya]Why keep lions instead of livestock? Assessing wildlife-tourism based payment for ecosystem services involving herders in the Maasai Mara, Kenya

Climate warming affects permafrost soil carbon pools in two opposing ways: enhanced vegetation growth leads to higher carbon inputs to the soil, whereas permafrost melting accelerates decomposition and hence carbon release. Here, we study the spatial and temporal dynamics of these two processes u...


Schaphoff, S.Heyder, U.Ostberg, S.Gerten, D.Heinke, J.Lucht, W.[Contribution of permafrost soils to the global carbon budget]Contribution of permafrost soils to the global carbon budget
Autor: Hassan, H.A.

Milk Production and milk constituents were studied in 95 ewes of two purebred groups, Ossimi(O) and Saidi (S), and two F1crosses with Chios(C) (CO and CS) from September 1991 to April 1993 at the Experimental Animal Farm, Faculty of Agriculture, Minia University, Egypt. Breed of ewe had an effect (p


Hassan, H.A.[Effects of crossing and environmental factors on production and some constituents of milk Ossimi and Saidi sheep and their crosses with Chios]Effects of crossing and environmental factors on production and some constituents of milk Ossimi and Saidi sheep and their crosses with Chios

It is not simple to predict how environmental changes may impact tropical forest species diversity. Published hypotheses are almost invariably too incomplete, too poorly specified and too dependent upon unrealistic assumptions to be useful. Ecologist have sought theoretical simplicity, and while ...


Sheil, Douglas[Tropical forest diversity, environmental change and species augmentation: after the intermediate disturbance hypothesis]Tropical forest diversity, environmental change and species augmentation: after the intermediate disturbance hypothesis

Decision makers require better understanding of local people’s needs in tropical forested landscapes to enable more locally relevant and sustainable conservation. The Center for International Forestry Research (CIFOR) developed a series of survey methods that assess the perceptions and priorities...


Sassen, M.Jum, C.N.[Assessing local perspectives in a forested landscape of central Cameroon]Assessing local perspectives in a forested landscape of central Cameroon
Autor: Ribot, J.C.

Accommodating multiple interests involves integrating across-highly stratified societies. Integral local development is a means of integrating across these interests through locally accountable representative authorities entrusted with public powers. It is integral to the local community because ...


Ribot, J.C.[Integral local development: 'accommodating multiple interests' through entrustment and accountable representation]Integral local development: 'accommodating multiple interests' through entrustment and accountable representation

The ascorbic acid (AA) concentration of tubers was determined in 25 Andean potato varieties (Solanum tuberosum L.) grown in three environments, and the effect of cooking and storage time in subsets of samples was evaluated. Significant variation due to genotype, environment and genotype × environ...


Burgos, G.Auqui, S.Amoros, W.Salas, E.Bonierbale, Merideth W.[Ascorbic acid concentration of native Andean potato varieties as affected by environment, cooking and storage.]Ascorbic acid concentration of native Andean potato varieties as affected by environment, cooking and storage.

This paper discusses the theme 'Agriculture and Development in Africa'. It was presented at one of the AU Fridays of the commission forums. It looks into the concept of agriculture and development versus agriculture for development; evidence on the grounds; reasons for poor performance; emerging ...


Anandajayasekeram, P.[Agriculture for development in Africa: Options and way forward]Agriculture for development in Africa: Options and way forward
Ayalneh, W.Woldu, Z.Gebremedhin, BerhanuTadesse, G.Peden, Donald G.[The benefits and environmental effect of community based small scale irrigation development in the Awash river basin, Ethiopia: A case study of four community based irrigation schemes]The benefits and environmental effect of community based small scale irrigation development in the Awash river basin, Ethiopia: A case study of four community based irrigation schemes

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