Effects and evaluation of soil trace elements after grassland converted into cropland in Guizhou karst area
In this study, the contents of available trace soil elements in different depths were measured and the element densities were calculated for the grasslands and their counterpart croplands, and consequently the regional indices of trace soil element was built for evaluating the study area. The result...
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Veröffentlicht in: | Nong ye gong cheng xue bao 2013-04, Vol.29 (7), p.230-237 |
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Sprache: | chi |
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Zusammenfassung: | In this study, the contents of available trace soil elements in different depths were measured and the element densities were calculated for the grasslands and their counterpart croplands, and consequently the regional indices of trace soil element was built for evaluating the study area. The results showed that trace soil elements decreased with soil depth. The soil contents of available Cu, Fe, B, and Mo decreased, ranging from 4.97% to 79.17%, resulting from the conversion of grassland to cropland. The soil content of available Zn in every soil depth in cropland was higher than in grassland, increasing in range from 11.76% to 46.06%; also, the declining rate of available Mn content in cropland areas was faster than in grassland areas after the grassland conversion. |
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ISSN: | 1002-6819 |
DOI: | 10.3969/j.issn.1002-6819.2013.07.029 |