第二代杉木林养分动态研究

Studies of Nutrient Dynamics of the Second Generation of China fir Plantation

根据连续定位观测所取得的数据 ,对 4个小集水区第二代 10年生杉木人工林生态系统中的养分循环进行了研究 .结果表明 ,集水区由降水输入的 N、P、K、Ca、Mg等营养元素总计为 5 9.2 85 kg/ hm2 a,径流输出为 38.938kg/ hm2 a,净积累量为 2 0 .34 7kg/ hm2 a.与该林分 7年生时相比 ,净积累量提高了 7.2 % ,说明集水区第二代杉木林生态恢复处于进展的变化过程 .

Based on successive located observation in the four watersheds, the nutrient cycling of the second generation of 10 year old China fir plantation was studied. The results show that the total amount of N, P, K, Ca and Mg from the precipitation was 59.285 kg/(hm 2 a) and that in runoff was 38.938 kg/(hm 2 a); so the net accumulation of them was 20.347 kg/(hm 2 a). Compared to the ecosystems of 7 year old plantation, the net accumulation raised 7.2% which indicates that the second generation of China fir plantation was just in the ecological recovery process.