| 摘要: |
| 【目的】 探讨大别山东南缘3种马尾松林型0～60 cm土层土壤养分含量及其土壤化学计量特征的变化规律，为该区马尾松林的可持续发展和生产提供科学依据。【方法】 在马尾松林龄为22年的马尾松纯林及马尾松×麻栎混交林、马尾松×枫香混交林内各设置样地3块，采用5点取样法分层（20 cm为1层）取样，并测定土壤有机C、全N、全P、全K含量，比较不同林型各土层土壤养分含量及生态化学计量特征。【结果】 马尾松各林型0～60 cm土层土壤有机C、全N、全P和全K含量均表现为马尾松×枫香混交林>马尾松×麻栎混交林>马尾松纯林。2种混交林各土层土壤有机C和全N含量显著高于其纯林，其中混交林表层（0～20 cm）土壤有机C含量较纯林增加了1.9倍，全N含量较纯林增加了2.6倍；土壤全P、全K 含量变异性较小，变异系数分别为0.07和0.10，在不同林型及不同土层差异均未达到显著水平。3种林型土壤C/N、C/P、C/K、N/P随土层的加深均有所降低，其中马尾松纯林表层土壤C/N显著高于混交林，马尾松×枫香混交林表层土壤C/P、C/K和N/P较马尾松纯林分别提高了44.22%，45.83%和57.59%；C/N、P/K较稳定，变异幅度小，变异系数分别为0.20和0.07，属弱变异；C/P、C/K、N/P、N/K变异系数均在0.2～0.5，变异幅度较大，属中等变异。由相关性分析可知，土壤有机C 与全N、全P含量呈极显著正相关，而与土壤K含量相关性较小；土壤全N与全P含量显著正相关，相关系数为0.744；土壤全K与土壤全N、全P含量相关性均不显著。【结论】 大别山区马尾松针阔混交林较马尾松纯林有效提高了林地土壤有机C、全N含量及C/P、C/K、N/P和N/K值，且表层土壤养分含量提高更显著，而森林类型的改变对土壤中P、K元素含量的影响较小。 |
| 关键词: 马尾松 纯林 针阔混交林 土壤养分 化学计量特征 |
| DOI： |
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| 基金项目:安徽省自然科学基金项目（1408085QC57）；安徽省高校省级优秀青年人才基金资助项目（2012SQRL058）；安徽农业大学青年科学基金重点项目（2012zd015）；安徽农业大学生态学一级学科博士点建设基金项目（XKTS2013004） |
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| Stoichiometric characteristics of soil C,N,P and K in different Pinus massoniana forests |
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QIN Juan,KONG Hai-yan,LIU Hua
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| Abstract: |
| 【Objective】 The changes of soil stoichiometric characteristics in three Pinus massoniana forests were explored in the southeastern margin of Dabie Mountains to provide scientific basis for the sustainable development and production of P.massoniana in this area.【Method】 Three sample plots were set in 22 years old pure P.massoniana forest (PF),P.massoniana and Quercusacu tissima mixed forest (PQM),and P.massoniana and Liquidambar formosana mixed forest (PLM).The 5 point sampling method was used for stratification and sampling (20 cm for each layer).The soil nutrient contents of soil organic carbon (C),total nitrogen (N),total phosphorus (P) and total potassium (K) in depth of 0-60 cm were measured and ecological stoichiometry characteristics in different forests and soil depths were compared.【Result】 Soil organic C,total N,total P and total K contents of P.massoniana forest in soil depth of 0-60 cm were in the order of PLM>PQM>PF.The soil organic C and total N of PLM and PQM were significantly higher than that of PF at different soil depths.In the surface layer soil (0-20 cm) of mixed forests,soil organic C and total nitrogen were 1.9 and 2.6 times more than in pure forest,respectively.The total P and total K contents had smaller variability and the variable coefficients were 0.07 and 0.10,respectively without significant difference among different forest types and soil depths.Soil C/N,C/P,C/K,and N/P ratios in the three different forests decreased with the increase of soil depth.The surface layer soil C/N of PF was significantly higher than the mixed forests.The PLM surface layer soil C/P,C/K and N/P ratios were increased by 44.22%,45.83% and 57.59% compared to PF.C/N and P/K ratios were stable with weak variable coefficients of 0.20 and 0.07.The variable coefficients of C/P,C/K,N/P,and N/K were 0.2-0.5,belonging to medium variation.Soil organic C had significantly positive correlation with total N and total P contents but not with total K.There was significant positive correlation between total N and total P with correlation coefficient of 0.744.Correlations among soil total K with total N and total P were insignificant.【Conclusion】 Soil organic C,total N,C/P,C/K,N/P and N/K in P.massoniana mixed forests were significantly higher than in the pure forest in Dabie Mountains,especially for surface layer.The change of forest type had minor effect on soil P and K. |
| Key words: Pinus massoniana pure forest coniferous and broadleaved mixed forests soil nutrient stoichiometric characteristics |
