【摘要】 在中国科学院红壤生态试验站对红壤坡地不同林地进行6 a(1991~1996)定位观测,对N、P、K养分动态循环进行了系统分析,建立了养分循环的分室模型。结果表明:不同林地N、P、K贮量绝大部分存在土壤分室中占97%以上,6年生阔叶林、针叶林N、P、K年总净积累量为正,分别为36.51 kg hm-2、29.70kg hm-2,系统养分盈余,另外N、P、K各分量积累量均为正,表现为各营养元素系统内盈余;对照(自然荒坡)N、P、K年净积累总量为-9.59 kg hm-2,为养分流失状态,N、P、K各分量也为流失状态。同时对有林坡地和荒坡地进行了0~10 a的系统N、P、K在各分室的运转状态模拟,模拟结果表明:N、P、K在阔叶林和针叶林系统均表现盈余,植株地上部分累积量较大,土壤分室N轻微流失,而P、K盈余,自然荒坡土壤养分有轻微流失。更多还原

【Abstract】 In the Ecological Experimental Station of Red Soil of Chinese Academy of Sciences,a six-year（1991～1996） stationary experiment had been carried out on a red soil slope land with different forests to study systematically dynamic circulation of N,P and K and establish a compartment model of nutrient circulation.The results indicate that a major part of N,P and K was stored in the soil compartment in different forest lands,amounting to above 97%.The annual total net accumulation of N,P and K was positive for six-year old broadleaf forest and conifer forest,being 36.51 kg hm^-2 and 29.70 kg hm^-2,respectively.The entire system was gaining in nutrient reserve,and N,P and K were all accumulating, showing surplus in the system.As a contrast,the annual total net accumulation of N,P,K in control（nature wild slope） was-9.59 kg hm^-2,suggesting an outflow of nutrients,N,P and K from the system.Meanwhile,simulation of N,P,K circulation in different compartments of the forest slope land and wild slope land within 0～10 years was described.The results indicate that N,P and K were in surplus in the broadleaf forest and conifer forest systems,and their accumulation in the ground parts of the plants was significant,but,in the soil compartment N was losing,and P and K were gaining.The results also show that nutrients in the soil compartment on the nature wild slope suffered slight loss.更多还原