摘要
应用系统分析和动态模拟的方法 ,对结果初期锥栗人工林的养分动态变化进行了分析和模拟 ,构建了林分树体地上部分、地下部分、土壤和凋落物 4个分室 ,测定了各分室的N、P、K、Ca、Mg各养分元素的现存库量 .土壤分室中N、P、K、Ca的现存量最高 ,分别达 311.4 7、11.4 36、2 18.9kg·hm-2 和 87 5 6kg·hm-2 ,Mg含量水平以凋落物分室最高 ,达 7.2 6 9kg·hm-2 .根据分室模型 ,计算了 5种元素各分室的流通量和流通率 ,并在不同营养元素补偿水平下 ,对系统各分室在未来 5年内的养分变化进行了模拟 ,结果表明 ,各元素每年最适宜的补充量为N 2 0kg·hm-2 、P 8kg·hm-2 、K 5kg·hm-2 、Ca 10kg·hm-2 、Mg 5kg·hm-2 .在这种补偿条件下 ,系统各分室间养分流动通畅 ,树体生长代谢正常 .
The dynamic variation of nutrient elements in Castanea henryi plantation was analysed and simulated by means of a system analysis,and the models of four compartments including aboveground,root,soil and litter were constructed. Evaluation on the nutrient pools of N,P,K,Ca and Mg in the four compartments at the beginning of fructification showed that soil compartment had highest content of N,P,K and Ca which was up to 311\^47,11\^64,218\^90 and 87\^56 kg·hm\+\{-2\},respectively.The highest Mg occurred in litter compartment, up to 7\^563 kg·hm\+\{-2\}.Based on the compartment model,the fluxes and rates of the five nutrient elements between the compartments were calculated,and their changing trends in compartments in 5 years were forecasted.The results showed that the most suitable amount of annually compensating the five elements was 20(N),8(P),5(K),10(Ca) and 5(Mg) kg·hm\+\{-2\},respectively.This nutrient compensation promoted the nutrient flows,and normalised the growth and metabolism of the tree.The research could provide with important basic data for nutrient management of this type of plantation at this stage.
出处
《应用生态学报》
CAS
CSCD
2002年第5期533-538,共6页
Chinese Journal of Applied Ecology
基金
福建省教委自然科学基金重点资助项目 (K970 42 )
