广州典型风水林碳密度特征

以广州市典型风水林为对象，对其生态系统全组分碳储量及其分配格局进行调查和估算，研究碳密度特征及其影响因素。结果显示：风水林生态系统平均碳密度为（259.17±69.67）t/hm²，其中，植被碳密度为（194.04±54.07）t/hm²（占74.9%）（其中以乔木层占绝对优势，达90%以上），土壤碳密度为（65.13±19.30）t/hm²（占25.1%）；植被和土壤碳密度之间呈显著正相关（P<0.05）；不同优势种类的风水林碳密度差异较大，以米槠（Castanopsis carlesii（Hemsl.）Hayata.）为优势的林分碳密度最大（310.57±62.65 t/hm²）。结果表明影响风水林碳密度的主要因子是林分胸高断面积、林分密度、土壤容重和土壤碳含量，其中，风水林碳密度与胸高断面积、土壤容重和土壤碳含量呈显著正相关，与林分密度呈显著负相关，与植物多样性无显著相关。研究结果对南亚热带林分改造和碳汇林营造具有重要科学意义。

Carbon density in geomantic forests in Guangzhou,China

Typical geomantic forests were studied in Guangzhou, and their carbon (C) density composition and distribution patterns were investigated. Ecosystem, vegetation, and soil C density were (259.17±69.67) t/hm², (194.04±54.07) t/hm², and (65.13±19.30) t/hm², respectively. The C densities of different dominant species in the geomantic forests differed significantly, with the highest C density for Castanopsis carlesii (Hemsl.) Hayata. (310.57±62.65 t/hm²). The ecosystem C storage was dominated by the tree layer (more than 90% of the vegetation). The main factors that affected forest vegetation C density in the geomantic forest were mean tree diameter at breast height (DBH), stand basal area (BA), stand density, soil bulk density, and soil C content, but not the species diversity indices. These results confirmed the importance of stand structure on C storage and dynamic reallocation in geomantic forests. Therefore, improving the complexity of community structure in geomantic forests during forest management might enhance forest C storage.