نتایج جستجو برای: shifting cultivation

تعداد نتایج: 61727  

Journal: :International Journal of Geographical Information Science 2006
Martin Rudbeck Jepsen Stephen Leisz Kjeld Rasmussen Jens Jakobsen Lasse Møller-Jensen L. Christiansen

Shifting cultivation in the Nghe An Province of Vietnam’s Northern Mountain Region produces a characteristic land-cover pattern of small and larger fields. The pattern is the result of farmers cultivating either individually or in spatially clustered groups. Using spatially explicit agent-based modelling, and relying on empirical data from fieldwork and observations for parameterization of vari...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده جغرافیا 1392

the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...

2010
A. SANCHEZ JOSE R.

A low-input cropping system has been developed at Yurimiaguas, Peru, to serve as a transition technology between shifting and continuous cultivation for acid soiln of the humid tropics. Principal features are slash-andburn clearing, rotation of acid-tolerant upland rice and cowpea cultivars, maximum residue return, no tillage, and no lime or fertilizer apoiications. When yields decline as a res...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2007
Deborah Lawrence Paolo D'Odorico Lucy Diekmann Marcia Delonge Rishiraj Das James Eaton

The long-term ecological response to recurrent deforestation associated with shifting cultivation remains poorly investigated, especially in the dry tropics. We present a study of phosphorus (P) dynamics in the southern Yucatán, highlighting the possibility of abrupt shifts in biogeochemical cycling resulting from positive feedbacks between vegetation and its limiting resources. After three cul...

2010
Nor Rasidah Hashim

Aerial photographs have been widely used to monitor large-scale spatial changes taking place over long periods. In this study, the types and trajectories of landscape changes in Sabal Forest Reserve in the Malaysian state of Sarawak, Borneo over a period of 26 years (1972-1998) were investigated using 1:25,000 scale aerial photographs and ground surveys. The aerial photographs showed typical la...

Journal: :Diversity and Distributions 2022

Shifting cultivation is a widespread land-use in many tropical countries that also harbours significant levels of biodiversity. Increasing frequency cycles and expansion into old-growth forests have intensified the impacts shifting on biodiversity carbon sequestration. We assessed how bird diversity responds to potential for co-benefits both such landscapes inform carbon-based payments ecosyste...

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