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为了研究南方红壤地区氮磷等养分的流失规律,将净耕果园对照(处理Ⅰ)、果树+百喜草敷盖(处理Ⅱ)和果树+百喜草覆盖(处理Ⅲ)3种处理措施进行比较,分析了不同处理措施对红壤坡地果园氮磷流失特征的影响.结果表明:水土流失是导致氮磷流失的主要原因,氮磷流失以泥沙携带为主.3个处理小区中氮磷的流失浓度基本呈先增大后减小并最终趋于稳定的状态,氮磷流失浓度的大小受降雨量及降雨历时等的影响不大,受降雨强度影响较大.处理Ⅱ小区和处理Ⅲ小区内的总氮及总磷流失量要远远低于处理Ⅰ小区,处理Ⅱ和处理Ⅲ均可有效控制氮磷的流失,其中以处理Ⅲ效果更佳并且便于实施.
In order to study the loss of nutrients such as nitrogen and phosphorus in the red soil region of South China, three treatments were compared: net control of plowed orchard (treatment Ⅰ), fruit tree + Bahia grass cover (treatment Ⅱ) and fruit tree + Bahia grass (treatment Ⅲ) , The effects of different treatments on the characteristics of nitrogen and phosphorus loss in orchard of red soil sloping fields were analyzed.The results showed that soil and water loss was the main reason leading to the loss of nitrogen and phosphorus and the loss of nitrogen and phosphorus was mainly carried by sediment.The loss of nitrogen and phosphorus in the three treatment plots The concentration basically increased at first and then decreased and finally stabilized. The concentration of nitrogen and phosphorus loss was not affected by the rainfall and rainfall duration, which was greatly influenced by the rainfall intensity. Total nitrogen and total phosphorus loss is much lower than that of treatment Ⅰ, treatment Ⅱ and treatment Ⅲ can effectively control the loss of nitrogen and phosphorus, of which the treatment Ⅲ effect is better and easy to implement.