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万物根固于土,命系于水。土是根,水是命。故尔,水土保持是地球上整个大陆生态系统中最核心的命题。在贵州省,坡耕地的水土保持又是全省生态系统中核心命题的重点课题之一。据估计:贵州省水土流失面积现约4万km~2,其中,至少有2万km~2是坡耕地,每年从坡耕地表流失且由各河口外泄的泥沙量可达4850万吨,占全省总外泄量(约6000万吨)的75％左右,相当于每年从坡耕地中流失457.5km~2耕地表土(约合100kg/m~2);每年由坡耕地地表迁移而失效的土壤不下1.5亿吨,相当于每年迁移性损失氮磷钾三素化肥131万吨,远远超过了贵州省现有坡耕地氮磷钾三素化肥施肥水平。仅仅从坡耕地表迁移性损失的氮磷钾三素化肥,每年便值数亿元人民币;这大致和1983年贵州省玉米的总产值相近(1983年玉米总产约42亿斤。)按美国水土保持局办法,将流失所造成的工程、水文、环保、兽禽、鱼虾、微生物乃至城镇工业等连锁损失也一一加以估算则贵州省每年从坡耕地上因水土流失导致综合性的宏观经济损失,不下于10亿元
Everything rooted in the soil, life tied to the water. Soil is root, water is life. So, water and soil conservation is the core proposition of the entire continental ecosystem on Earth. In Guizhou Province, the soil and water conservation of slope farmland is one of the key topics in the province’s ecosystem. It is estimated that the area of soil and water loss in Guizhou Province is about 40,000 km2, of which, at least 20,000 km2 is sloping land. Each year, the amount of sediment discharged from sloping farmland surfaces and discharged from estuaries reaches 48.5 million tons , Accounting for about 75% of the total discharge of the province (about 60 million tons), which is equivalent to the loss of 457.5km ~ 2 topsoil (about 100kg / m ~ 2) from sloping fields every year; No less than 150 million tons of soil failure, the equivalent of annual loss of migration of NPK three yuan of 1.31 million tons of fertilizer, far exceeding the existing slope farmland in Guizhou Province NPK fertilizer application level. Only three years of NPK fertilizers, which migrate from sloping farmland to the surface, amount to hundreds of millions of RMB each year; this is roughly the same as the total output value of maize in Guizhou in 1983 (the total output of maize was about 42 billion kg in 1983) Soil and Water Conservation Bureau measures will be caused by the loss of engineering, hydrology, environmental protection, animal poultry, fish and shrimp, microbes and even urban industries, such as chain losses are estimated one by one Guizhou Province from sloping land due to soil erosion led to a comprehensive macro Economic loss, no less than 1 billion yuan