Soil nutrients in response to intensive management of Phyllostachys praecox

Key words: 
• pedology /
• Phyllostachys praecox /
• intensive practice /
• soil nutrients

Abstract: The purpose is to investigate the status and evolution of soil nutrients when traditional practice shifted to intensive one in Phyllostachys praecox plantation .Soil samples under 4 , 6 , 8 and 10-years intensive management respectively were collected .A fertilizer trial including different types and rates of fertilizer was conducted from August 2003 to June 2004, six treatments were respectively controled , including three mixture treatments of different amount of manure and mineral fertilizer and two pure treatments of single mineral fertilizer but different in rates , soils were sampled every two months .The results showd that the contents of soil total organic carbon (TOC), total phosphorous (TP), available phosphorous (AP) and ratio of TOC to TN (C N)were increasing with prolong of intensive practice (from 4 to 10 years).TOC were elevated under all the treatments after one-year trial with an average of 10.42 %, especially in three mixture treatments .In comparison of three mixture treatments , soil TN , TP , AP and hydrolysable nitrogen (HN)apparently augmented with the increasing of fertilizer amount .As for the two pure treatments of single mineral fertilizer , significant differences in TP and AP between lower and higher amount of mineral fertilizer were observed , but not in TN and HN .The seasonal dynamic of soil nutrients appeared in wave curve , soil nutrients were at relative lower level from August to December , increased from December to February of next year , and then declined again until the end of experiment in June .Soil TP and AP were elevated by an average of 10.19% and 15.31 %respectively for all the treatments after one-year's trial , however , soil TN and HN increased only in the three mixture treatment (to 3.03 % and 2.84 % respectively), declined (to 15.94 % and 73.47 % respectively)in the two pure treatments .[ Ch , 3 tab .9 ref .]