The changes in land use and land cover have a strong effect on the total soil organic carbon, its fractions and its overall soil health. This study carried out in Olesharo Catchment, Kenya, was to quantify the differences in total organic carbon (TOC), particulate organic carbon (POC), mineral organic carbon (MOC) and carbon management index (CMI) among four land use types: grasslands, shrublands, agricultural lands and barelands. It was also purported to evaluate the use of CMI as an indicator for soil degradation or improvement in response to land use and land cover changes. The results of the study show that the mean values of TOC, POC and MOC are significantly different between land use types. Thus, shrublands have significantly higher TOC (22.26 g kg−1) than grasslands (10.29 g kg−1) and bare lands (7.56 g kg−1). They also have significantly higher POC (7.79 g kg−1) and MOC (10.04 g kg−1) than all the other land use types. The agricultural lands have higher CMI than grasslands (53% vs 41% relative to shrublands) suggesting that grasslands face serious degradation through overgrazing. This study shows that different land use types have an influence on soil organic carbon pools, and consequently on the CMI, the CMI could be used as an indicator for soil degradation or improvement in response to land use and land cover changes.

中文翻译：

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肯尼亚纳罗克县奥莱萨罗流域不同土地利用类型下土壤有机碳组分和碳管理指数的评估。

土地利用和土地覆盖的变化对土壤有机碳总量，其比例和土壤整体健康有很大影响。在肯尼亚Olesharo集水区进行的这项研究旨在量化四种土地利用类型之间的总有机碳（TOC），颗粒有机碳（POC），矿物有机碳（MOC）和碳管理指数（CMI）之间的差异： ，灌木丛，农田和荒地。还据称评估了CMI作为土壤退化或改善的指标，以响应土地使用和土地覆盖的变化。研究结果表明，土地利用类型之间的TOC，POC和MOC平均值存在显着差异。因此，灌木丛的TOC（22.26 g kg-1）明显高于草地（10.29 g kg-1）和裸地（7.56 g kg-1）。与所有其他土地利用类型相比，它们的POC（7.79 g kg-1）和MOC（10.04 g kg-1）也明显更高。农业用地的CMI高于草原（53％相对于灌木地为41％），表明草原由于过度放牧而面临严重退化。这项研究表明，不同的土地利用类型会对土壤有机碳库产生影响，因此对CMI产生影响，CMI可以作为土壤退化或改善的指标，以响应土地利用和土地覆盖的变化。