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dc.contributorKuziev, Ramazanen_US
dc.contributorSommer, Rolfen_US
dc.contributorMartius, Christopheren_US
dc.contributorForkutsa, Oksanaen_US
dc.contributorMassucati, Luizen_US
dc.creatorAkramkhanov, Akmalen_US
dc.identifier.citationAkmal Akramkhanov, Ramazan Kuziev, Rolf Sommer, Christopher Martius, Oksana Forkutsa, Luiz Massucati. (28/1/2012). Soils and Soil Ecology in Khorezm, in "Cotton, Water, Salts and Soums ". Berlin, Germany: Springer Netherlands.en_US
dc.description.abstractThe current status of the agricultural soils in Khorezm is closely linked to their development influenced by past river flows and more recent human-managed irrigation and drainage practices. The initial relief of the Amudarya river delta was formed by ancient channels that carried large amounts of sediments. When irrigation was introduced, sediments started to be deposited on croplands, a process which formed the now spatially distinct features in the topsoils. Today’s landscape of the ancient river delta is thus significantly influenced by human interference. The areas presently used for irrigated agriculture are traversed by a network of irrigation canals, collectors and drains. Long-term irrigation formed a layer of uniform topsoil, referred to as an agro-irrigation horizon, covering a multi-layered alluvium. This chapter provides an impression of the current state of land resources in the irrigated areas of the Khorezm region. We analyzed soil properties based on present and past data; the latter from a period before agriculture expanded and intensified. Soil texture is dominated by silt loam layers together with sandy loams and loams that constitute almost 80% of all soil layers. Organic matter in irrigated soils is low, constituting on average 7.5 g kg−1 (0.75%) in the topsoil layers and decreasing in the deeper layers. Afforestation can increase SOC stocks. Soil microbiological activities reflected in the soil respiration rate were closely linked to soil organic carbon content and revealed considerable carbon accumulation under zero-tillage systems. Soil macrofauna density was highest under vegetation dominated by one tree species, Euphrates poplar (Populus euphratica Oliv.; Salicaceae), but its biodiversity was highest in cultivated sites (and dominated by small predatory arthropods). These results may serve as benchmarks in future monitoring of land use effects on soil quality. Most subsoils in Khorezm are slightly- to medium-saline, whereas the majority of topsoils above 60 cm are strongly saline. Between 1960 and 1990, moderately saline soils increased from 21% to 31%, and highly saline soils, from 6% to 21%.en_US
dc.publisherSpringer Netherlandsen_US
dc.subjectmicro- and macro-faunaen_US
dc.titleSoils and Soil Ecology in Khorezmen_US
dc.typeBook Chapteren_US
cg.creator.idAkramkhanov, Akmal: 0000-0002-4316-5580en_US
cg.creator.idSommer, Rolf: 0000-0001-7599-9056en_US
cg.subject.agrovocsoil respirationen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerInternational Center for Tropical Agriculture - CIATen_US
cg.contributor.centerState Scientific-Research Institute of Soil Science & Agrochemistryen_US
cg.contributor.centerUniversity of Bonn, Center for Development Research - Uni-Bonn - ZEFen_US
cg.contributor.centerUniversity of Bonn - Uni-Bonnen_US
cg.contributor.crpCGIAR Research Program on Dryland Systems - DSen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionCentral Asiaen_US
dc.identifier.statusLimited accessen_US

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