陈山红心杉(Cunninghania lanceolata)是江西特有树种,获国家地理标志保护。目前关于其植物—土壤关系的研究较少。以不同林龄(5、10、20和40a)陈山红心杉为对象,研究了其根际和非根际土壤有机碳、氮含量和根际效应。结果表明:根际pH略小于非根际,有机碳和氮素总体上大于非根际。随林龄的增加,根际和非根际土壤有机碳和氮含量先降后增;有机碳、全氮和有机氮的根际效应先增后降;铵态氮、硝态氮和无机氮的根际效应先降后趋于平缓;pH和碱解氮的根际效应变化平缓。氮含量对根际和非根际土壤pH和有机碳的影响为全氮>无机氮>碱解氮;碱解氮和全氮的根际效应分别对pH和有机碳根际效应影响最大。随着林龄的增加,硝态氮的比重高于铵态氮,应注意反硝化作用可能造成的氮素流失,同时林地土壤养分下降,在10 a前后应注意林地有机质和氮素的补充,以防地力衰退。 Cunninghania lanceolata is endemic to Jiangxi and is protected by the national geographical indication. At present, there are few researches on the relationship between plant and soil. The soil organic carbon and nitrogen contents and rhizosphere effects of rhizosphere and non-rhizosphere soil were studied in different ages (5, 10, 20 and 40 years). The results showed that: the rhizosphere pH was slightly less than the non-rhizosphere, organic carbon and nitrogen overall was greater than non-rhizosphere. With the increase of forest age, the contents of soil organic carbon and nitrogen decreased first and then increased; the rhizosphere effects of organic carbon, total nitrogen and organic nitrogen increased first and then decreased; the contents of ammonium nitrogen, nitrate nitrogen and inorganic nitrogen The rhizosphere effect tended to be gentle first and then decreased. The rhizosphere effect of pH and alkali-hydrolyzed nitrogen changed gently. The effects of nitrogen on rhizosphere and non-rhizosphere soil pH and organic carbon were total nitrogen> inorganic nitrogen> available nitrogen; rhizospheric effects of both basic nitrogen and total nitrogen had the greatest effect on pH and organic carbon rhizosphere. With the increasing of ages, the proportion of nitrate nitrogen is higher than that of ammonium nitrogen. The nitrogen loss possibly caused by denitrification should be noticed. At the same time, the soil nutrient of forest land should be decreased. To prevent land degradation.