应用模型模拟施肥对杉木人工林生态系统的影响

Effect of Model-based Simulation Fertilization on Ecosystem of Chinese Fir Plantation

以中亚热带(湖南和江西)杉木林分为研究对象,应用FORECAST模型,探讨了连续4个轮伐期的好中差3种立地杉木林分生长和生态系统过程对N、P、N+P混合施肥的响应。结果表明:与N肥相比,使用P肥对杉木林分生长(如树高、胸经)和生态系统过程(土壤腐殖质、林分凋落物、土壤N和P储量等)具有更好的促进作用;与较好立地相比,在较差立地林分施肥具有更好的效果;在4个轮伐期中,前一个轮伐期施肥后一个轮伐期林分仍具有明显影响,显示了施肥效果的累积性。这些结果对杉木人工林经营、低效林改造具有指导作用。

By using the FORECAST model simulation,the responses of tree growth and ecosystem processes to N,P,N+P mixed fertilization regimes were studied in three type of sites(good,medium and poor sites)during four rotations of Cunninghamia lanceolata stands in the middle subtropics(Hunan and Jiangxi Province)of China.The results showed that compared with N fertilizer,P fertilizer had better promoting effect on the growth of tree growth(such as tree height,and diameter at the breast height)and ecosystem process(such as soil humus accumulation,forest litter dynamic,soil N and P content,etc.).Compared with the good sites,fertilization had better effect on tree growth and ecological processes in stands at the poor site.In the four rotation periods,fertilization in the previous rotation period still displayed the effects in stands of the next rotation,showing obvious accumulation of fertilization effect.These results not only have a guiding role in the management of C.lanceolata plantations,but also have implications for other tree species plantations.