The impact of land-cover change on soil properties in northern Ghana
The impact of land-cover change on soil properties in northern Ghana
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DOI：
10.1002/ldr.590
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发表时间：
2004-01-01
影响因子：
4.7
通讯作者：
Vlek, PLG
中科院分区：
文献类型：
--
作者：
Braimoh, AK;Vlek, PLG
研究了加纳北部某地区土地覆被变化对土壤质量参数的影响。土地覆盖变化是根据1984年、1992年和1999年研究区域的地图得出的。1992年以来，自然植被下土壤的理化性质与人工栽培土壤无显著差异，而永久栽培土壤（1984 ~ 1999年）理化性质显著低于人工栽培土壤。1992-1999年以来新开垦的土壤有机C、N、Ca、Mg和ECEC含量显著高于长期耕作土壤，表明连作是导致土壤质量恶化的原因。估算了满足所选土壤质量参数临界水平所需的最低有机碳含量。新开垦土壤的有机碳含量需要增加约7公顷(1)来补充土壤养分资本。这就需要一种有机物质管理与无机肥料施用同步的策略。还需要进一步研究开发耕作系统，以保存有机质，并提高研究区域的有机质质量。版权所有：John Wiley Sons， Ltd. 2004
Effects of changes in land-cover on soil quality parameters in an area in northern Ghana were studied. Land-cover changes were derived from maps of the study area for 1984, 1992 and 1999. There were no significant differences between properties of soils under natural vegetation and soils put under cultivation from 1992, but permanently cultivated soils (1984 4999) showed significantly lower physical and chemical soil properties. Soils recently opened up since 1992 for cultivation in the last seven years (i.e. 1992-1999) were found to manifest significantly higher contents of organic C, N, Ca, Mg and ECEC than those under permanent cultivation, suggesting that continuous cropping is responsible for deterioration in soil quality. Minimum organic C contents necessary to meet critical levels of selected soil quality parameters were estimated. The organic C content of recently cultivated soils would need to be increased by about 7 t ha(-1) to replenish soil nutrient capital. This calls for a strategy to synchronize organic matter management with inorganic fertilizer application. Further research is also needed to develop farming systems that conserve organic matter and also improve the quality of organic matter in the study area. Copyright (C) 2004 John Wiley Sons, Ltd.