| 摘要: |
| 杉木 Cunninghamia lanceolata 纯林的长期经营容易出现土壤退化、地力减弱、生物多样性下降等一系列生态问题。营造杉木阔叶混交林是平衡森林经营经济效益与生态效益的有益尝试。研究采用单因素方差分析、非参数 Spearman 相关分析等统计方法，分析了粤西杉木阔叶混交林地土壤的理化特性，探讨林地土壤碳、氮、磷等养分保持的杉木阔叶混交林模式。结果表明：土壤有机碳含量、碳氮比、碳磷比在不同杉木混交林模式间有极显著差异，氮磷比没有差异。各土壤生态化学计量在不同杉木混交林间的变化趋势并不一致。土壤有机碳含量、碳氮比在不同杉木林地土壤中的占比间有显著差异，其余无显著差异。纯杉木林的土壤有机碳含量、碳氮比、碳磷比均最低，氮磷比最高。土壤生态化学计量与土壤化学因子相关性较强，与土壤物理因子相关性较弱。其中，与土壤化学因子中全氮含量、碱解氮含量的相关性较强，与土壤物理因子中的毛管持水量有一定的相关关系。土壤有机碳含量、碳氮比、碳磷比、氮磷比在不同树木高度级下均无显著差异；氮磷比，土壤有机碳含量、碳磷比、碳氮比在不同径级间均有显著差异，并且随着林木径级升高，土壤有机碳含量、碳氮比、碳磷比呈现出显著升高趋势，氮磷比呈现出降低趋势。杉木混交林对比杉木纯林能明显提高土壤有机碳含量，积累土壤养分，改良土壤性状。其中，混交比例为 1∶1 的杉木和火力楠 Michelia macclurei 混交林表现更优。 |
| 关键词: 杉木混交林 阔叶树 土壤生态化学计量 土壤有机碳含量 碳氮比 森林土壤 |
| DOI： |
| 分类号: |
| 基金项目:广东省森林生态综合示范园（省德庆林场森林质量提升示范园）项目 |
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| Soil Ecological Stoichiometry in Cunninghamia lanceolata Mixed Forests and Influencing Factors of Stand Structure |
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Gong Yiguang1, XU Mingfeng2, XIE Zhengsheng3, HUANG Yiqiang4, LIANG Yuxing1, WANG Kai1, LI Chunyong1
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1.Deqing Forest Farm of Guangdong Province;2.Guangdong Academy of Forestry;3.South China Agricultural Museum & Archive , South China Agricultural University;4.Zhaoqing Institute of Agricultural Sciences
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| Abstract: |
| The pure Cunninghamia lanceolata forest with long-term high-frequency rotation is prone to a series of ecological problems such as soil degradation, soil fertility depletion and biodiversity decline. Therefore, it is a bene?cial attempt to build a C. lanceolata and broad-leaved trees mixed forest to balance economic and ecological benefits. In this study, we used statistical methods such as one-way analysis of variance and non-parametric Spearman correlation analysis to analyze the soil physical and chemical properties in C. lanceolata mixed forests in western Guangdong, and explored the mixed pattern of C. lanceolata that was beneficial to maintaining soil carbon, nitrogen, phosphorus and other nutrient factors. The results showed that there were
signi?cant differences in soil organic carbon content(SOC content), C/N and C/P among different C. lanceolata mixed patterns, but no differences in N/P. The trends of soil ecological stoichiometry were not consistent among different C. lanceolata mixed forests. SOC content, C/N had signi?cant differences among different proportions of C. lanceolata, while the others had no significant differences. SOC content, C/N and C/P were the lowest in pure C.lanceolata forest, while N/P was the highest. Soil ecological stoichiometry had strong correlation with soil chemical factors, especially with total nitrogen content and available nitrogen content. However, the correlation between soil ecological stoichiometry and soil physical factors was weak, and it was mainly related to capillary moisture capacity. SOC content, C/N, C/P and N/P had no signi?cant differences at different height classes. In addition to N/P, SOC content, C/P and C/N had signi?cant differences among different DBH classes, and with the increase of DBH class, SOC content, C/N and C/P showed a signi?cant increasing trend, while N/P showed a decreasing trend. Conclusion: Compared with pure C. lanceolata forest, C.lanceolata mixed forest could signi?cantly increase SOC content, accumulate soil nutrients and improve soil properties. Among them, C. lanceolata and Michelia macclurei mixed forest with the ratio of 1:1 had better performance. |
| Key words: Cunninghamia lanceolata mixed forest broad-leaved tree soil ecological stoichiometry soil organic carbon content C/N forest soil |
