Growth of mixed birch-coniferous stands in relation to pure coniferous stands at similar sites in south-eastern Norway
Growth of mixed birch-coniferous stands in relation to pure coniferous stands at similar sites in south-eastern Norway
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DOI：
10.1080/028275802753626782
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发表时间：
2002-01-01
影响因子：
1.8
通讯作者：
Frank, J
中科院分区：
文献类型：
--
作者：
Frivold, LH;Frank, J
对20个白桦混交林的平均树龄、平均顶高和产量进行了研究。和B. pendula Roth)和云杉（L.）岩溶。挪威东南部的9个桦树和西尔维斯松混交林。每个混交林和相邻的纯针叶林（对照）在相同的立地条件下生长，没有进行商业间伐。在混交林中，桦树和针叶树的平均胸高和顶高均无显著差异，而桦树的平均高度显著高于云杉。根据总体积和乳房高度年龄计算生长指数。在云杉立地中，幼混交林（桦木< 17 m）的生长优于纯云杉，而老混交林的生长差异不显著。生长指数与再生再生桦树与营养再生桦树之比呈正相关，与混交林中最老树种的树龄和立地质量呈负相关。在松林中，混交林与纯松林的生长指数差异不显著。不能证明桦树对云杉或松树的体积产量有混合效应。
Mean age, mean and top heights and yield were studied in 20 mixed stands of birch (Betula pubescens Ehrh. and B. pendula Roth) and Picea abies (L.) Karst. and nine mixed stands of birch and Pinus sylvestris L. in south-eastern Norway. Each mixed stand and the adjacent pure coniferous stand (control) were growing under the same site conditions and had not been commercially thinned. There were no significant differences in mean age at breast height or in top heights between birch and conifers in the mixed stands, while mean height was significantly higher for birch than for spruce. A growth index was calculated based on total volume and age at breast height. For the spruce sites the growth in young mixed stands (birch < 17 m) was superior to that of pure spruce, while the difference was insignificant in older stands. The growth index correlated positively with the ratio between generatively and vegetatively regenerated birch trees, and negatively with the age of the oldest species in the mixture and with site quality. For the pine sites there was no significant difference in the growth index between mixed birch-pine and pure pine stands. A mixture effect of birch on the volume yield of spruce or pine could not be demonstrated.