<正>以福建惠安１５年生木麻黄林为试材的定位观测结果表明：每年降水输入的营养物质为４９．２８５ｋｇ·ｈｍ－２，径流输出养分量１５．５０７ｋｇ·ｈｍ－２，养分净积累量３３．７７８ｋｇ·ｈｍ－２表明生态系统处于进展的变化过程中。养分地球化学循环的净变化值比生物循环减小７５．６％，这说明生物循环比地球化学循环强度大且速度快。

Based on located observation and chemical analyses in the Casuarina equisetifolia plantation of 15 years, the geochemical cycling in the ecosystem was studied. The results showed that the total amount of nutrient elements in precipitation was 49．285 kg·hm-2·a-1and that in runoff was 15．507　kg·hm-2·a-1， so the net accumulation of them was 33．778 kg·hm-2·a-1 This revealed that the ecosystem was at its progressive phase. Compared with the biological cycling, the net accumulation of the geochemical cyching was less than 75．6%， so the biological cycling was operating faster and more intensively than the geochemical cyching. 