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用标准地 标准木 分层分割法测定了华北落叶松 (Larixprincipis rupprechtiiMayr)树干主要营养元素的分布规律 ,结果为 :树干木质部水平方向N、P、K质量分数随年龄增加逐渐增大 ,Ca、Mg的逐渐减少。树干木质部垂直方向N、P、K质量分数随圆盘高度增加而增加 ,Ca、Mg变化较小。树皮N、P、K、Mg质量分数随圆盘高度的增加而增大 ,Ca有减小的趋势 ,但梢部质量分数较高 ;树干主要营养元素的质量分数大小排序为 :K >Ca >N >Mg >P。不同个体不同组分质量分数之比分别为 ,皮 /木N :4 1～ 6 3,P :2 8～ 4 8,K :2 1～ 2 7,Ca :2 3～ 4 1,Mg :2 1～ 3 1;皮 /心 ,N :4 9～ 8 6,P :5 2～ 7 5,K :2 2～ 2 7,Ca :2 6～3 8,Mg :2 0～ 3 2 ;边 /心 ,N :1 2～ 1 8,P :1 8～ 2 3,K :1 1～ 1 4 ,Ca :0 7～ 0 8,Mg :0 9～ 1 1。树干主要营养元素运输趋势为 :N、P、K由心材向边材 ,由干基向梢部 ,Ca、Mg由边材向心材 ,且K、Ca、Mg变化梯度较小 ,N、P变化梯度较大 ,质量分数较低。测定树干主要营养元素质量分数的最佳取样部位在树高的 3/10～ 5/10处。
The distribution patterns of the main nutrient elements in the trunk of Larix principis rupprechtii Mayr were determined by the standard method of standard wood stratification. The results showed that the contents of N, P and K in the horizontal direction increased gradually with age, Gradual decrease. The vertical mass fraction of N, P and K of trunk xylem increased with the increase of disk height, while Ca and Mg changed little. The contents of N, P, K and Mg in tree bark increased with the increase of disc height, and Ca decreased but the shoots had higher mass fraction. The order of mass fraction of main nutrients in trunk was K> Ca > N> Mg> P. The ratio of the mass fractions of different components in different individuals were as follows: skin / wood N: 4 1 ~ 6 3, P 2 28 ~ 4 8, K 2 1 ~ 2 7, Ca 2 3 ~ 4 1, Mg 2 1 to 3 1; skin / heart, N: 49 to 86, P: 52 to 75, K: 22 to 27, Ca: 26 to 38, Mg: 20 to 32 / Heart, N: 1 2 ~ 1 8, P: 1 8 ~ 2 3, K: 1 1 ~ 1 4, Ca: 0 7 ~ 0 8, Mg: 0 9 ~ 1 1. The main nutrient elements transport trends of trunk were: N, P, K From heartwood to sapwood, from dry basis to tip, Ca, Mg From sapwood to heartwood, K, Ca and Mg changed less gradient and N, P Gradient larger, lower quality scores. The best sampling site for determining the main nutrient elements mass fraction in the trunk was 3/10 ~ 5/10 of the tree height.