不同树种配置模式和郁闭度对桉树改造林土壤养分的影响OA北大核心
Effects of Different Tree Species Configuration Modes and Canopy Density on Soil Nutrients in Eucalyptus robusta Plantation
由于桉树人工林种植模式基本为多代连栽的单一模式,导致了诸多生态学问题的出现.因此,确保人工桉树林能够实现长期、稳定的可持续经营,已成为人工桉树林栽培技术的热点问题.为实现这一目标,采取恰当的树种配置与适度的郁闭度是调整林分结构、增强土壤质量的有效方法.选取佛山市西岸林场6个桉树纯林样地进行改造,研究2种树种配置模式(A为5种山茶科树种,B为5种山茶科树种和2种落叶阔叶树种)和3种桉树郁闭度(Y1为0%,Y2为15%,Y3为30%)对土壤理化性质、酶活性和土壤化学计量比的影响.在不同树种配置模式中,B模式Y3样地3个土层(0～20、20～40、40～60 cm)的土壤毛管持水量、土壤毛管孔隙度和土壤孔隙比与0～20 cm土层的全氮、氮磷比(N∶P)、过氧化氢酶活性和脲酶活性显著高于A模式Y3样地(P<0.05).在不同郁闭度中,A模式Y3样地3个土层的全磷、有效磷、速效钾、过氧化氢酶活性和脲酶活性显著高于Y1样地(P<0.05),且B模式Y3样地3个土层的有机碳、全氮、碱解氮、有效磷、过氧化氢酶活性和N∶P显著高于Y1样地(P<0.05).综上所述,合适的树种配置模式和郁闭度有益于土壤养分和酶活性的提高,30%桉树郁闭度下山茶科树种与落叶阔叶树种的模式在华南地区的改造具有良好的应用前景.
Because the planting mode of Eucalyptus robusta plantation is basically a single mode of multi-generation continuous planting,many ecological problems are caused.Therefore,ensuring that artificial E.robusta forests can achieve long-term and stable sustainable management has become a hot issue in the cultivation technology of artificial E.robusta forests.In order to achieve this goal,adopting appropriate tree species configuring and moderate canopy density is an effective way to adjust the stand structure and enhance the soil quality.In this study,six E.robusta pure forest plots were selected from the West Coast Forestry Farm in Foshan City,China,to study the effects of two species configuration modes(A is 5 species of Theaceae,B is 5 species of Theaceae and 2 de-ciduous broad-leaved tree species)and three E.robusta canopy density(Y1 is 0%,Y2 is 15%,and Y3 is 30%)on the soil physical and chemical properties,enzyme activities,and soil stoichiometric ratios.Among the different tree species configuration mode,the soil capillary water holding capacity,soil capillary porosity and soil void ratio of three soil layers(0-20,20-40,40-60 cm)and the total nitrogen N∶P,catalase activity and urease activity of 0-20 cm soil layer in Y3 plot of mode B were significantly higher than those in Y3 plot of mode A(P<0.05).In different canopy density,the total phosphorus,available phosphorous,available potassium,cata-lase and urease activity of the three soil layers in the Y3 plot of the A model were significantly higher than those in the Y1 plot(P<0.05),and the soil organic carbon,total nitrogen,alkali-hydrolyzable nitrogen,available phosphorous,catalase activity and N∶P of the three soil layers in the Y3 plot of the B model were significantly higher than those in the Y1 plot(P<0.05).In conclusion,the ap-propriate tree species configuration mode and canopy density are beneficial to the improvement of soil nutrients and enzyme activities,and the pattern of Theaceae tree species and deciduous broad-leaved tree species under 30%E.robusta canopy density has a good prospect of application in the transformation of South China.
刘长德;刘梦瑶;陈锦睿;胡文涛;田雪琴;赵鸿杰;罗霜;王洪梅;潘澜
华南农业大学 林学与风景园林学院,广州 510642佛山市规划城建档案馆,广东 佛山 528000佛山市林业科学研究所,广东 佛山 528222
林学
桉树配置模式郁闭度土壤理化性质土壤酶活性土壤化学计量比
Eucalyptus robustaconfiguration modecanopy densitysoil physical and chemical propertiessoil enzyme activ-itysoil stoichiometric ratio
《森林工程》 2025 (001)
86-99 / 14
广东省林业科技创新项目(2018KJCX047).
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