29 Result(s)
within
Wolfgang Zech
Life Sciences
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Article
Open AccessFactors determining the distribution of Erica patches on the Sanetti Plateau, Bale Mountains, Ethiopia
In the Bale Mountains, the ericaceous belt ranges between 3200 and 3800 m asl. Studies indicate an expansion on the Sanetti Plateau at the end of the Late Glacial and during the early Holocene. Currently, only...
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Reference Work Entry In depth
Geology and Soils
The subject geology and soils is fundamental for tropical forest management. This chapter is divided into three logical parts: The first describes soil-forming factors and processes. The second provides the ex...
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Article
Soil microbial C and N turnover under Cupressus lusitanica and natural forests in southern Ethiopia assessed by decomposition of 13C- and 15 N-labelled litter under field conditions
Natural forests in Ethiopia are frequently replaced by Cupressus lusitanica plantations, but little is known about consequences of this land use change for soil C and N dynamics. The objectives of the study were:...
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Living Reference Work Entry In depth
Geology and Soils
The subject geology and soils is fundamental for tropical forest management. This chapter is divided into three logical parts: The first describes soil-forming factors and processes. The second provides the ex...
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Article
Impact of forest organic farming change on soil microbial C turnover using 13C of phospholipid fatty acids
Situated in the fast-develo** country of Brazil, the Atlantic rainforest Mata Atlântica faces risks generated by population growth-derived problems. Conversion of forest to agriculture has led to a mosaic la...
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Article
Long term effects of manure, charcoal and mineral fertilization on crop production and fertility on a highly weathered Central Amazonian upland soil
Application of organic fertilizers and charcoal increase nutrient stocks in the rooting zone of crops, reduce nutrient leaching and thus improve crop production on acid and highly weathered tropical soils. In ...
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Article
Soil microbial activities in tree-based crop** systems and natural forests of the Central Amazon, Brazil
Little information is available about the factors controlling soil C and N transformations in natural tropical forests and tree-based crop** systems. The aim of this work was to study the effects of single t...
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Article
Nutrient availability and leaching in an archaeological Anthrosol and a Ferralsol of the Central Amazon basin: fertilizer, manure and charcoal amendments
Soil fertility and leaching losses of nutrients were compared between a Fimic Anthrosol and a Xanthic Ferralsol from Central Amazônia. The Anthrosol was a relict soil from pre-Columbian settlements with high o...
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Chapter
Organic Chemistry Studies on Amazonian Dark Earths
The organic chemistry of soil organic matter (SOM) in ADEs can be looked at at different scales, depending on the type of interest. At an ecological level, operationally defined SOM fractions with different tu...
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Chapter
Soil Organic Matter Stability in Amazonian Dark Earths
If human activities are indeed primarily responsible for the development of the high C contents in ADE, one might expect that cessation of these activities would result in reductions in organic matter content,...
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Article
Ameliorating physical and chemical properties of highly weathered soils in the tropics with charcoal – a review
Rapid turnover of organic matter leads to a low efficiency of organic fertilizers applied to increase and sequester C in soils of the humid tropics. Charcoal was reported to be responsible for high soil organ...
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Article
The effect of single tree species on soil microbial activities related to C and N cycling in the Siberian artificial afforestation experiment
The effects of grassland conversion to forest vegetation and of individual tree species on microbial activity in Siberia are largely unstudied. Here, we examined the effects of the six most commonly dominant t...
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Article
Tree species mediated soil chemical changes in a Siberian artificial afforestation experiment
Natural and human-induced changes in the composition of boreal forests will likely alter soil properties, but predicting these effects requires a better understanding of how individual forest species alter soi...
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Article
Effects of deforestation on contents and distribution of amino sugars within particle-size fractions of mountain soils
Identifying amino sugar pools in soil may advance our knowledge about microbially derived substances. Our objective was to study the effects of deforestation followed by pasture establishment on amino sugar c...
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Article
Nitrogen cycling assessment in a hedgerow intercrop** system using 15N enrichment
Nitrogen (N) cycling was determined in monocultures of Sorghumbicolor (L.) Moench and alley cropped sorghum with Acaciasaligna (Labill.) H. Wendl. in semiarid Northern Kenya. N inputthrough biological N2 fixation...
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Article
Carbon and nitrogen mineralization in cultivated and natural savanna soils of Northern Tanzania
In the present study, soil C and N mineralization and nutrient availability were compared: (1) in savanna woodland soils under natural acacia vegetation; (2) at termite sites; (3) in degraded woodland where a...
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Article
The 'Terra Preta' phenomenon: a model for sustainable agriculture in the humid tropics
Many soils of the lowland humid tropics are thought to be too infertile to support sustainable agriculture. However, there is strong evidence that permanent or semi-permanent agriculture can itself create sus...
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Article
Effect of five tree crops and a cover crop in multi-strata agroforestry at two fertilization levels on soil fertility and soil solution chemistry in central Amazonia
The spatio-temporal patterns of soil fertility and soil solution chemistry in a multi-strata agroforestry system with perennial crops were analysed as indicators for the effects of crop species and management ...
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Article
Nutrient interactions of alley cropped Sorghum bicolor and Acacia saligna in a runoff irrigation system in Northern Kenya
In a runoff irrigation system in Northern Kenya, we studied the nutrient interactions of sole cropped and alley cropped Sorghum bicolor (L.) Moench and Acacia saligna (Labill.) H.L. Wendl. The trees were prune...
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Article
Fine root turnover of irrigated hedgerow intercrop** in Northern Kenya
Fine root turnover (<2 mm) was determined from repeated measurements of root distribution up to 120 cm soil depth by core sampling in four month intervals. Sole cropped Sorghum bicolor and Acacia saligna were ...
