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不同造林模式对桉树生长和土壤理化性质的影响
黄兰清,邓力,陈卫国,余玉珠,郭萍,吴越海,刘德承
广西壮族自治区国有钦廉林场
摘要:
为探究桉树 Eucalyptus robusta 最佳的造林模式, 以巨尾桉 E. grandis×E. urophylla 纯林 (T1)、 巨尾桉×刨花润楠 Machilus pauhoi 混交林 (T2)、 巨尾桉×红锥 Castanopsis hystrix 混交林 (T3) 3 种造林 模式为研究对象, 造林 4 a 后对巨尾桉的生长及林地土壤 20、 40 cm 深度的理化性质进行测定和分析。 结 果表明, T2 的树高、 单株材积和蓄积量最大, 分别较 T1 显著增加了 22. 19%、 58. 33%和 66. 47% (P< 0. 05), T3 的胸径最大, 较 T1 显著增加了 19. 08% (P<0. 05)。 随着土层深度的增加, 土壤总孔隙度和 毛管孔隙度逐渐减小。 除 T3 外, 其他处理的土壤全氮含量随着土层深度的增加呈上升趋势; 而土壤碱解 氮、 全磷、 全钾、 有效磷、 速效钾、 有机质、 有效铜、 有效铁、 有效锌及有效硼含量随着土层深度增加 呈下降趋势。 土壤理化性质指标与巨尾桉生长指标均呈正相关。 综上, 两种混交模式均可提高巨尾桉的 生长量并改善土壤质量, 但从生长指标来看, T2 的造林模式更有利于巨尾桉的生长。
关键词:  巨尾桉  混交林  生长指标  物理性质  化学性质
DOI：
分类号:
基金项目:广西自筹经费林业科技项目 (桂林科研 [2022ZC] 第 97 号)。
Effects of Different Silvicultural Patterns on the Growth of Eucalyptus robusta and Soil Physicochemical Properties
Huanglanqing1, Dengli2, Chenweiguo2, Yuyuzhu2, Guoping2, WU Yuehai2, Liudeicheng1
1..State-owned Qinlian Forestry Farm, Guangxi Zhuang Autonomous Region;2.State-owned Qinlian Forestry Farm, Guangxi Zhuang Autonomous Region
Abstract:
To explore the best afforestation model of Eucalyptus robusta, three afforestation models were investigated, which were a pure stand of E. grandis × E. urophylla ( T1 ), a mixed stand of E. grandis × E. urophylla and Machilus pauhoi (T2), and a mixed stand of E. grandis×E. urophylla and Castanopsis hystrix (T3). After four years of afforestation, the growth performance of E. grandis×E. urophylla and soil physical and chemical properties at 20 and 40 cm depths were measured and analyzed. The results showed that T2 exhibited the greatest tree height, individual volume and stand volume with significant increases of 22. 19%, 58. 33% and 66. 47% respectively compared to T1 (P<0. 05). T3 showed the largest DBH, being 19. 08% greater than T1 (P<0. 05). Soil total porosity and capillary porosity decreased with increasing soil depth. Except in T3, the total nitrogen content increased with soil depth, while the contents of available nitrogen, total phosphorus, total potassium, available phosphorus, available potassium, organic matter, available copper, available iron, available zinc and available boron all decreased with depth. All soil physical and chemical parameters showed positive correlations with the E. grandis growth metrics. In conclusion, both mixed plantations enhanced the growth of E. grandis×E. urophylla and improved soil quality, but T2 proved superior for the E. grandis growth.
Key words:  Eucalyptus grandis×E.urophylla  mixed forests  growth  soil physical properties  soil chemical properties