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不同海拔梯度与种植模式下华榛的生长响应

Growth Response of Corylus chinensis to Different Elevation Gradients and Planting Patterns

  • 摘要: 为探究海拔、种植模式对华榛(Corylus chinensis Franch.)引种适应性的影响及土壤的调控机制,在浙江建德(130 m)、桐庐(560 m)、临安(890 m)三个海拔梯度上分别设置纯林、混交林种植试验,连续8年检测华榛植株生长与结实指标,并结合土壤进行主成分分析与多因素方差分析。结果表明:华榛在各海拔均能正常生长结实,种植次年苗木存活率达95%以上,8年生林分平均树高>4.82 m、平均胸径>6.10 cm。海拔与种植模式对树高和胸径的交互效应极显著(P<0.001),表现为低海拔区纯林优于混交林,中、高海拔区混交林更具生长优势。土壤主成分分析提取出肥力因子PC1(贡献率66.4%)和酸碱盐基因子PC2(贡献率30.4%),树高和胸径均与PC1呈极显著正相关。综上,华榛对种植模式的生长响应因海拔和土壤条件而异。在本试验条件下,中、高海拔土壤肥沃时混交林更具优势,低海拔贫瘠立地适宜采用纯林种植模式,种植模式的选择宜充分考虑立地土壤本底状况。

     

    Abstract: To investigate the effect of elevations and planting patterns on the introduction adaptability of Corylus chinensis and the regulatory role of soil, pure and mixed forests were established at three elevation gradients in Jiande (130 m), Tonglu (560 m), and Lin’an District(890 m), Hangzhou, Zhejiang Province. Growth and fruiting indices of C. chinensis plants were measured for eight consecutive years, and in combination with soil properties, principal component analysis (PCA) and multi-factor variance analysis(ANOVA)were performed. The results showed that C. chinensis grew and fruited normally at all elevations, with the seedling survival rate exceeding 95% in the second year after planting. The mean tree height of 8-year-old stands exceeded 4.82 m and the mean diameter at breast height (DBH) exceeded 6.10 cm. The interaction effects of elevation and planting pattern on tree height and DBH were highly significant (P<0.001), indicating that pure forests outperformed mixed forests at low-elevation areas, whereas mixed forests had greater growth advantages at middle and high elevations. PCA of soil extracted a fertility factor (PC1, its contribution rate was 66.4%) and pH-salt factor PC2 (PC2, its contribution rate was 30.4%). In conclusion, the growth response of C. chinensis to planting pattern varies with elevation and soil conditions. Under the conditions of this experiment, mixed forests are more advantageous at middle and high elevations with fertile soil, whereas pure forests are suitable for poor soils at low elevation, the background soil conditions at the site should be fully taken into account in selecting planting patterns.

     

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