<正>对福建省安溪半林国有林场不同林龄福建柏人工林养分的生物循环特点进行了研究。结果表明 :不同林龄林分的生物循环表现了一定的差异性。 1 0、2 0、30a林分的养分吸收量分别为 69.85、96.65、67.0 2t/(hm2 ·a) ,归还量分别为 2 0 .1 5、35 .0 4、35 .2 0t/(hm2 ·a) ,存留量分别为 49.70、61 .2 5、31 .82t/(hm2 ·a)。养分循环速率随林龄而增大 ,依次为 2 8.85、36.63、5 2 .5 2。 3种林龄林分对各养分元素具有相近的利用效率。据此提出 ,对处于生长旺盛后期的林分 ,采取适量施肥和调整林分密度等经营措施 ,提高养分的利用效率和存留量 ,可使林分继续保持旺盛的生长趋势 ,有利于培养大径材人工林

Fokienia hodginsii is one of the most important tree that were cultivated for timber in south of China. Since 1950’s, a large area of plantation of Fokienia hodginsii was planted in Fujian province. In order to provide scientific basis on the other studies and management about it, we studied the nutrient cycling of Fokienia hodginsii plantation in 1997. The results showed: the nutrient cycling was different among the different ages of Fokienia hodginsii stands. The uptake of 10, 20, and 30 years old Fokienia hodginsii plantation was 69.85,96.65,67.02 t/(hm 2·a); the return was 20.15,35.04,35.20 t/(hm 2·a); the retention was 49.70,61.25,31.82 t/(hm 2·a) respectively. We used the ratio of yearly nutrient uptake to yearly biomass as the nutrient use efficiency, then the ratio of 10, 20, and 30 years old Fokienia hodginsii plantation was nearly same.