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Influence Mechanisms of Rainfall and Terrain Characteristics on Total Nitrogen Losses from Regosol

机译：降雨和地形特征对雷哥sol尔总氮损失的影响机理

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摘要

The upper reach of the Yangtze River is an ecologically sensitive region where water loss, soil erosion, and nonpoint source (NPS) pollution are serious issues. In this drainage area, regosol is the most widely distributed soil type. Cultivation on regosol is extensive and total nitrogen (TN) has become a common NPS pollutant. Artificial rainfall experiments were conducted to reveal the influence mechanisms of rainfall and terrain on TN losses from regosol. The results showed that there were positive correlations between precipitations and TN loads but negative ones between precipitations and TN concentrations. Furthermore, negative correlations were more obvious on fields with slopes of 5° and 25° than on other slopes. With increasing rainfall intensity, TN loads rose simultaneously. However, TN concentration in runoff-yielding time presented a decline over time. As far as terrain was concerned, TN loads grew generally but not limitlessly when slopes increased. Similarly, TN concentrations also rose with rising slopes; upward trends were more obvious for steeper slopes. Furthermore, the initial runoff-yielding time became longer for steeper slopes and the differences under various rainfall intensity conditions diminished gradually.
机译：长江上游是一个生态敏感地区，水流失，水土流失和面源污染是严重的问题。在这个流域，雷哥sol尔是分布最广的土壤类型。雷哥go的耕作广泛，总氮（TN）已成为一种常见的NPS污染物。进行人工降雨实验以揭示降雨和地形对雷哥多的总氮损失的影响机理。结果表明，降水量与总氮负荷之间呈正相关，而降水量与总氮浓度之间呈负相关。此外，在5°和25°坡度的田地上，负相关性比其他坡度更明显。随着降雨强度的增加，总氮负荷同时上升。但是，径流量中总氮浓度随时间呈下降趋势。就地形而言，TN负载总体上会增加，但随着坡度的增加并非无限增加。同样，总氮浓度也随着斜率的上升而上升。陡峭的斜坡，上升趋势更为明显。此外，陡峭斜坡的初始产水时间变长，并且在各种降雨强度条件下的差异逐渐减小。

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