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Assessment of soil degradation and chemical compositions in Rwandan tea-growing areas

Geoscience Frontiers 2011年第4期2卷 599-607页

作者： Jean de la Paix Mupenzi Lanhai Li Jiwen Ge Achal Varenyam Gabriel Habiyaremye nzayisenga theoneste Kamanzi Emmanuel xinjiang Institute of Ecology and Geography Chinese Academy of Sciences State Key Laboratory of Oasis Ecology and Desert Environment 818 Beijing South Road Urumqi Xinjiang 830011 China School of Environmental Studies China University of Geosciences 388 Lumo Road Hongshan Administrative District Wuhan Hubei 430074 China Hubei Key Laboratory of Wetland Evolution ＆ Eco-Restoration 388 Lumo Road Hongshan Administrative District Wuhan Hubei 430074 China

This study has focused on the processes of soil degradation and chemical element concentration in tea-growing regions of Rwanda,*** degradation accelerated by erosion is caused not only by topography but also by human *** soil degradation involves both the physical loss and reduction in the amount of topsoil associated with nutrient *** samples were collected from eleven tropical zones in Rwanda and from variable depth within each collecting *** these,Samples from three locations in each zone were analyzed in the laboratory,with the result that the pH of all soil samples is shown to be less than 5（pH〈5） with a general average of *** elements such as iron（Fe）, copper（Cu）,manganese（Mn）,and zinc（Zn） are present in high concentration *** contrast calcium （Ca） and sodium（Na） are present at low-level concentrations and carbon（C） was found in minimal *** addition,elements derived from fertilizers,such as nitrogen（N）,phosphorous（P）,and potassium（K） which is also from minerals such as feldspar,are also present in low-level concentrations. The results indicate that the soil in certain Rwandan tea plantations is acidic and that this level of pH may help explain,in addition to natural factors,the deficiency of some elements such as Ca,Mg,P and *** use of chemical fertilizers,land use system and the location of fields relative to household plots are also considered to help explain why tea plantation soils are typically degraded.

关键词： Chemical elements Fertilizer use pH Soil degradation Tea plantations

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