Assessment of runoff nutrients loss in Phyllostachys praecox cv. prevernalis forest land under simulated rainfall conditions

Abstract

The loss regularity of nitrogen (N), phosphorus (P), and chemical oxygen demand (COD_Mn) of runoff under different rainfall intensity and different management practices in Phyllostachys praecox cv. prevernalis forest land was studied. The total nitrogen (TN) and COD_Mn concentration in runoff were significantly correlated with the rainfall intensity under the three management modes named as control, fertilization, and cover. Moreover, N mainly lost in the form of nitrate (NO₃⁻-N). Generally, the relationship between total and dissolved phosphorus (TP and DP) loss in the three management modes was estimated in following orders: coverage > fertilization > control. The loss of P was mainly in the granular state, and the loss of DP only accounted negligible amount of the TP loss. The loss of COD_Mn was closely related to the magnitude of rainfall intensity. Results revealed that COD_Mn concentration in runoff under fertilization and cover management was significantly correlated with the rain fall intensity.