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Vegetation soil water carrying capacity of artificial pasture in loess
Authors
王延平
邵明安
Publication date
1 January 2012
Publisher
Abstract
土壤水分植被承载力是黄土高原生态环境建设和可持续发展的核心。该文根据陕北黄土区4种不同立地条件下苜蓿地(MedicagosativaL.)连续3a的降雨、径流、土壤水分动态和生物产量的小区定位观测结果,研究分析了自然降水与土壤水分补给、土壤水分补给与地上部生物量、地上部生物量与土壤水分消耗的关系;并采用FAO法和水量平衡法分别计算出了苜蓿地土壤水分的承载力。结果表明:苜蓿地土壤水分补给量与地上部生物量呈线性关系,地上部生物量与土壤水分消耗量呈二次函数关系。用FAO法估算可得陕北黄土区土壤水分可承载的苜蓿最大产量为3992.2~4173.7kg/hm2;而根据水量平衡原理计算可得陕北黄土区苜蓿地可承载的地上部生物量为2600~3500kg/hm2,比FAO法低16.07%~33.52%。坡向、坡位相同时,坡度增大,承载力降低;坡向、坡度相同时,下坡承载力大于上坡;坡度、坡位相同时,南坡承载力小于北坡。 更多还原<br /
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018