为探究梵净山冷杉和珙桐土壤中碳、氮、磷含量的丰缺现状及主要限制因子,促进梵净山冷杉与珙桐的立地研究保护与旅游开发的协调发展,通过对梵净山冷杉与珙桐产地土壤的碳、氮、磷的含量与相关性进行了研究,并与其它区域冷杉和珙桐土壤养分进行对比研究。结果表明:梵净山冷杉土壤养分含量要高于珙桐产地土壤含量,梵净山冷杉土壤有机碳平均含量大于珙桐土壤有机碳,珙桐碱解氮含量(672.14mg/kg)>冷杉土壤碱解氮含量(164.02mg/kg),梵净山冷杉全氮、全磷、有效磷平均含量分别为2.24g/kg、1.14g/kg、13.13mg/kg;珙桐全氮、全磷、有效磷平均含量分别为14.59g/kg、0.09g/kg、27.39mg/kg,2种珍稀植物土壤养分都能为珍稀植物生长提供良好的养分条件。梵净山冷杉土壤碳、氮、磷含量要高于急尖长苞冷杉、百山祖冷杉、臭冷杉、岷江冷杉,有效磷是梵净山冷杉种群生长的障碍性因子,甚至是限制性因子。梵净山珙桐土壤碳、氮、磷含量为中等,土壤有机碳含量为珙桐种群生长的限制性因子,梵净山珍稀植物林下土壤全氮与有机碳含量呈极显著正相关,土壤全磷与有机碳含量呈极显著负相关,全氮与有机碳具有显著的相同来源,全磷与全氮则具有相反的来源。 In order to explore the status quo and main limiting factors of carbon, nitrogen and phosphorus content in the soil of Fir and Davidia involucrata in Fanjing Mountain and to promote the coordinated development of site research, conservation and tourism development of Fir and Davidia involucrata in Fanjing Mountain, The contents and correlations of carbon, nitrogen, and phosphorus in firtree and Davidia involucrata-producing soils were studied and compared with those in other regions. The results showed that the content of soil nutrients in the fir forest of Fanjing Mountain was higher than that of the soil of Davidia involucrata. The average content of soil organic carbon in the fir forest of Fanjing Mountain was higher than that of the soil organic carbon and the Davidia involucrata (672.14 mg / kg) (164.02mg / kg), and the average contents of total nitrogen, total phosphorus and available phosphorus in Fanshan fir were 2.24g / kg, 1.14g / kg and 13.13mg / kg, respectively. The contents of total nitrogen, total phosphorus, The average contents of available phosphorus were 14.59g / kg, 0.09g / kg and 27.39mg / kg, respectively. The soil nutrients of two rare plants could provide good nutrient conditions for the growth of rare plants. The content of carbon, nitrogen and phosphorus in the fir forest of Fanjingshan Mountain was higher than that of the Abies faxoniana, Abies fargesii, Abies faxoniana, Abies faxoniana and the available phosphorus were the obstacle factors and even the limiting factors . The soil carbon, nitrogen and phosphorus contents were moderate in the Fanjingshan Mountain, and the soil organic carbon content was the limiting factor for the growth of the Davidia involucrata forest. The total nitrogen in the forest under the Fanjingshan rare earth plant had a significant positive correlation with the organic carbon content. Total phosphorus and organic carbon content showed extremely significant negative correlation, total nitrogen and organic carbon had significant same source, total phosphorus and total nitrogen had the opposite origin.