【摘要】 通过两年的定位实验 ,研究了三峡库区 5种代表性土地利用方式对养分流失的重要性。实验表明 ,不同土地利用方式的养分年输出总量有较大的变异 ,其变化趋势为坡地农田 >梯田农田 >梯田果园 >坡地果园。不同土地利用方式下 ,降雨量和降雨强度与系统径流量和含沙量的相关性都达到 5%显著性水平。不同土地利用方式 ,其径流养分输出占系统养分总输出的比例明显不同。土地利用方式对系统 N、P、K的径流输出影响显著。三峡库区脆弱生态系统区的坡地利用 ,坡地果园是较理想的土地利用方式。更多还原

【Abstract】 Nutrient losses of five kinds of land use systems in the Three Gorge Reservior Area was studied.Measurement data revealed that the annual nutrient loss of different land use systems varied.The trend is that:sloping agriculture field>terraced fields>terraced orchard>sloping orchard.In different land use systems,the relation among rainfall amount,rainfall intensity and runoff,sediment delivery is different.But they all reached 5% significance level.In different land use systems,the percent of nutrient output in runoff is different.To deal with the fragile ecosystem zone in TGRA,the type of land use should be selected in terms of fertilizer dressing and field management level,the most suitable land use system is sloping orchard in the study area.更多还原