Abstract
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.
Highlights
Taihu Lake of Southeast China has witnessed both the rapid economic bloom of its neighboring areas and a dramatic algal bloom of its water body in the past two decades
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)
Summary
Taihu Lake of Southeast China has witnessed both the rapid economic bloom of its neighboring areas and a dramatic algal bloom of its water body in the past two decades. The Chinese government has shown its resolution to combat pollution of the lake by closing a large number of heavy polluting enterprises around the lake and by banning the selling and use of P-bearing detergents in its catchment. It seems the causes and effects of eutrophication of the lake are rather complex. Accelerated entrophication, the biological enrichment of surface waters stemming from anthropogenic inputs of nutrients, is the most common surface water impairment in the lakes of China (Zhu, 1995; Zhang et al, 2007). As P is generally considered to be the key element that controls or limits productivity of fresh water, the decrease of P loss in runoff has become a major target to minimize surface water degradation (Charpenter et al, 1998; Boesch et al, 2001; Wang et al, 2001)
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