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通过在四岭水库流域代表性毛竹林地设置定位径流小区,研究不同施肥条件下毛竹林地磷素流失状况.该定位试验设有对照(CK,不施肥),农民常规高产栽培(FFP)与适地养分科学管理(SSNM)3个处理.结果表明,在2009年6月～2010年2月这9个月的监测期内,各次自然降雨条件下毛竹林地表径流中总磷(TP)平均浓度为0.59 mg/L,生物有效磷(BAP)平均浓度为0.22 mg/L,其中95%的TP浓度>0.10 mg/L.与FFP处理相比,整个监测期内SSNM处理可溶性磷(DP)流失总量减少了16.7%,生物有效磷(BAP)流失总量减少11.0%.磷素流失量与降雨量、径流量均呈极显著的正相关关系,毛竹林地磷素的流失集中发生在降雨量大的6～8月,各处理中PP流失量与泥沙流失量呈显著的正相关关系,其R2值在0.73～0.88之间.
The runoff of Phosphorus in Phyllostachys pubescens forest under different fertilization conditions was studied by locating runoff plot on the representative bamboo forest in the Siling Reservoir.The experiment included CK and no fertilization and conventional high yielding cultivation (FFP) (SSNM) .Results showed that during the 9-month monitoring period from June 2009 to February 2010, the average concentration of total phosphorus (TP) in surface runoff of Phyllostachys pubescens forest under various natural rainfall conditions Was 0.59 mg / L and the average concentration of bioavailable phosphorus (BAP) was 0.22 mg / L, of which 95% of the TP concentration was> 0.10 mg / L. Compared with the FFP treatment, SSNM treatment of soluble phosphorus The total amount decreased by 16.7% and the total loss of bio-available phosphorus (BAP) decreased by 11.0% .The amount of phosphorus loss showed a significant positive correlation with rainfall and runoff, and the phosphorus loss in moso bamboo forest concentrated on rainfall From June to August, there was a significant positive correlation between PP loss and sediment loss in each treatment, with R2 value between 0.73 and 0.88.