Surface runoff and phosphorus (P) loss from bamboo (Phyllostachys pubescens) forest ecosystem in southeast China
The effect of different fertilization treatments on runoff and nutrient losses under field conditions was investigated through setting runoff plots in bamboo (Phyllostachys pubescens) forests in a catchment of Taihu Lake. The results showed that, the runoff loss reached 356, 361 and 342 m3/hm2, while the soil particle loss reached 393, 392 and 442 kg/hm2, respectively, in the period from June 2009 to May 2010, under the treatments of control (CK), site-specific nutrient management (SSNM) and farmers’ fertilizer practice (FFP). The runoff and soil particle losses were highly correlated with the precipitation during the period. The largest phosphorus losses happened in August, when it had the largest rainfall of that year. The total phosphorus (TP) concentration of the 95% of the observed runoff samples exceeded 0.10 mg/l. The average bioavailable phosphorus (BAP) concentration of the runoff was 0.23 mg/l and the various phosphorus forms lost was strongly inter-correlated. Compared with FFP, the SSNM treatment reduced total P (TP) by 5%, total dissolved phosphorus (DP) loss by 15% and total bioavailable phosphorus (BAP) loss by 8%.
Key words: Phyllostachys pubescens, ecosystem, surface runoff, phosphorus (P) loss.