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首页> 外文期刊>Land Degradation and Development >PROJECTED CHANGES IN SOIL ORGANIC CARBON STOCKS UPON ADOPTION OF RECOMMENDED SOIL AND WATER CONSERVATION PRACTICES IN THE UPPER TANA RIVER CATCHMENT, KENYA
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PROJECTED CHANGES IN SOIL ORGANIC CARBON STOCKS UPON ADOPTION OF RECOMMENDED SOIL AND WATER CONSERVATION PRACTICES IN THE UPPER TANA RIVER CATCHMENT, KENYA

机译：肯尼亚上塔纳河上游流域采用建议的水土保持措施后，土壤有机碳变化的预估变化

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Large areas in the Upper Tana river catchment, Kenya, have been over-exploited, resulting in soil erosion, nutrient depletion and loss of soil organic matter (SOM). This study focuses on sections of the catchment earmarked as being most promising for implementing Green Water Credits, an incentive mechanism to help farmers invest in land and soil management activities that affect all fresh water resources at source. Such management practices can also help restore SOM levels towards their natural level. Opportunities to increase soil organic carbon (SOC) stocks, for two broadly defined land use types (croplands and plantation crops, with moderate input levels), are calculated using a simple empirical model, using three scenarios for the proportion of suitable land that may be treated with these practices (low=40percent, medium=60percent, high=80percent). For the medium scenario, corresponding to implementation on similar to 348000ha in the basin, the eco-technologically possible SOC gains are estimated at 4 center dot 8 to 9 center dot 3x106tonnes (Mg) CO2 over the next 20years. Assuming a conservative price of US$10 per tonne CO2-equivalent on the carbon offset market, this would correspond to similar to US$48-93 million over a 20-year period of sustained green water management. This would imply a projected (potential) payment of some US$7-13ha-1 to farmers annually; this sum would be in addition to incentives that are being put in place for implementing green water management practices and also in addition to the benefits that farmers would realize from the impact on production of these practices themselves
机译：肯尼亚塔纳河上游流域的大片土地被过度开发，导致土壤侵蚀，养分消耗和土壤有机质（SOM）流失。这项研究的重点是流域中被指定为最有希望实施绿色水信贷的部分，这是一种激励机制，可以帮助农民投资影响到所有淡水资源的土地和土壤管理活动。这样的管理实践还可以帮助将SOM水平恢复到自然水平。使用简单的经验模型计算了两种广泛定义的土地利用类型（耕地和种植作物，投入水平适中）的土壤有机碳（SOC）储量的机会，其中使用了三种情景来确定可能的适宜土地比例使用这些做法进行处理（低= 40％，中= 60％，高= 80％）。对于中等规模的情景，对应于在流域上类似的348000公顷土地的实施，在未来20年中，估计在4个中心点8到9个中心点3x106吨（Mg）的CO2的生态技术可能的SOC收益。假设碳补偿市场的保守价格为每吨二氧化碳当量10美元，这相当于在20年的持续绿色水管理期间将达到48-93百万美元。这意味着预计每年（潜在）向农民支付约7-13ha-1美元;除了为实施绿色水管理实践而采取的激励措施之外，这笔款项还包括农民从这些实践本身对生产的影响中将获得的利益之外的收益。

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