krainaksiazek combating land degradation in production landscapes 20124090
- znaleziono 2 produkty w 1 sklepie
Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers Springer Netherlands
Książki / Literatura obcojęzyczna
Ecotones, or boundary zones between land and inland waters (such as lakes, streams and rivers), are the principal routes for transport of organic matter and nutrients across landscapes via physical and biological vectors. The ecotone is the place of cumulation and transformation of in situ production as well as of allochthonous material from adjacent aquatic and terrestrial systems. The ecotype functions as an important barrier or filter for principal nutrients, such as phosphorus and nitrogen, responsible for the eutrophication and degradation of surface waters. Intensive forest cutting, agriculture, pollution and bank regulation, urbanization and hydrotechnical constructions seriously endanger the ecotone systems and damage their protective function. It is vital to develop a scientific understanding of the behaviour of phosphorus and nitrogen in these transitional boundary habitats. Such an understanding is important for the rational protection, management and restoration of ecotones connected with lakes and rivers. The importance of nutrient cycling and retention is discussed from the point of view of ecotone function, management and reconstruction in order to sustain its protective role for water bodies. Various types of land/water transitory zones are discussed: wetlands, lake littoral systems, riparian zones of rivers, streams and brooks, the contact zones between groundwater and surface waters of lakes and rivers, air--water interfaces, and patch/ecotone structures in watersheds.
Conservation Song White Horse Press
Książki / Literatura obcojęzyczna
A CONSERVATION HISTORY WITH LESSONS FOR TODAY Conservation Song explores ways in which colonial relations shaped meanings and conflicts over environmental control and management in Malawi. By focus- ing on soil conservation, which required an integrated approach to the use and management of such natural resources as land, water and forestry, it examines the origins and effects of policies and their legacies in the post-colonial era. That interrelationship has fundamental contemporary significance and is not simply a phenomenon created in the colonial period. For instance, like other countries in the region, post-colonial Malawi has been bedevilled by increasing rates of environmental degradation due, in part, to the expansion of human and ani- mal populations, cash crop production, drought and consequent deforestation. These issues are as critical today as they were six or seven decades ago. In fact, they are part of a conservation song that has a long and complex history. The song of conservation was initially composed and performed in the colonial peri- od, modified during the immediate postcolonial period and further refashioned in the post-dictatorship period to suit the evolving political climate; but the basic lyrics remain essentially the same. This book attempts to explain the evolution of the conservationist idea whilst demonstrating changes and continuities in peasant-state relations under different political systems. The dominant narrative posits conservation as a progressive movement aimed at re-organising natural resources and protecting them from destruction but the idea was contested and deeply embedded in colonial power relations and scien- tific ethos. Conservation emerged as an important tool of colonial state interven- tion and control concerning people and scarce resources. Conservation Song shows how the idea of conservation was rooted in and driven by a particular type of science about the organisation of space and landscapes. It offers a strategic entry point to understanding the historical roots of Africa's social and ecological problems over time, which are also intertwined with power and poverty relation- ships. In the postcolonial period, the conservation tempo subsided and became neglected in public discourse, only to re-emerge in the 1990s through the democratisation movement.
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