【摘要】 [目的]探究珍稀濒危植物银杉天然林与人工林土壤碳(C)、氮(N)、磷(P)、钾(K)生态化学计量和微生物量碳氮(MBC、MBN)特征，为银杉的科学保护提供参考。[方法]在广西桂林花坪国家级自然保护区红滩银杉人工林、谢塘湾银杉天然林和野猪塘银杉天然林，采集土壤样本(0～20 cm),测定含水量(SWC)、pH、有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)、有效氮(AN)、有效磷(AP)、有效钾(AK)和微生物量碳氮(MBC、MBN),计算土壤生态化学计量比，并将土壤养分与生态化学计量比进行方差及相关性分析。[结果]银杉人工林的SOC、TN和AN含量显著低于天然林(P<0.05),而pH和TK含量则显著高于后者(P<0.05),TP、AP、MBC、MBN在各林分间无显著差异(P>0.05);银杉人工林的C∶N、C∶P、C∶K、N∶P和N∶K均显著低于天然林(P<0.05),P∶K无明显差异(P>0.05),而MBC∶SOC、MBN∶TN则显著高于天然林(P<0.05);Pearson相关分析表明，银杉天然林的MBC和MBN与C、N、P、K及其生态化学计量比无显著相关性(P>0.05),C∶N、C∶P、C∶K、N∶P、N∶K和P∶K呈两两正相关，MBC∶SOC与C、N、P、K及其生态化学计量比呈显著负相关(P<0.05)。银杉人工林的土壤养分及其生态化学计量比主要受AN和AP的影响，而银杉天然林主要受pH、AN和AK的影响。[结论]花坪银杉人工林和天然林的土壤养分及其生态化学计量比存在差异的原因可能是受AN和AP的影响。更多还原

【Abstract】 [Objective] To investigate the ecological stoichiometry of carbon(C), nitrogen(N), phosphorus(P) and potassium(K) and the characteristics of microbial biomass carbon and nitrogen(MBC, MBN) in natural and plantation forests of the rare and endangered Cathaya argyrophylla, and to provide a reference for the scientific conservation of Cathaya argyrophylla. [Method] Soil samples(0-20 cm) were collected from Hongtan Cathaya argyrophylla plantation, Xietangwan Cathaya argyrophylla natural forest, and Yezhutang Cathaya argyrophylla natural forest in Guilin Huaping National Nature Reserve in Guangxi, China, to determine the water content(SWC), pH, organic carbon(SOC), total nitrogen(TN), total phosphorus(TP), total potassium(TK), immediate nitrogen(AN), immediate phosphorus(AP), immediate potassium(AK), and microbial biomass carbon and nitrogen(MBC, MBN), soil ecological stoichiometric ratios were calculated, and soil nutrients and ecological stoichiometric ratios were analyzed by variance and correlation. [Result] The SOC, TN and AN of Cathaya argyrophylla plantation were significantly lower than those of natural forests(P<0.05), while pH and TK were significantly higher than those of the latter(P<0.05), and there were no significant differences in TP, AP, MBC, and MBN among forest stands(P>0.05). The C∶N, C∶P, C∶K, N∶P, and N∶K of Cathaya argyrophylla plantation were significantly lower than those of natural forests(P<0.05), P:K was not significantly different(P>0.05), while MBC∶SOC and MBN∶TN were significantly higher than those of natural forests(P<0.05);Pearson correlation analysis showed that MBC and MBN of Cathaya argyrophylla natural forests were not significantly correlated with C, N, P, K and their ecological stoichiometric ratios(P>0.05), and that C∶ N, C∶ P, C∶ K, N∶ P, N∶ K and P∶ K were two-by-two positively correlated, and MBC∶SOC was significantly negatively correlated with C, N, P, K and their ecological stoichiometric ratios(P<0.05). Soil nutrients and their ecological stoichiometric ratios of Cathaya argyrophylla plantation were mainly affected by AN and AP, whereas those of Cathaya argyrophylla natural forests were mainly affected by pH, AN and AK. [Conclusion] Differences in soil nutrients and their ecological stoichiometric ratios between Huaping Cathaya argyrophylla plantation and natural forests may be due to the influence of AN and AP.更多还原