李尧 雷泽勇 于东伟 张岩松 白津宁

摘要 以科尔沁沙地不同生长期（幼林、中龄林、成熟林、过熟林）的樟子松人工林为对象，研究0～100 cm层土壤碳氮磷化学计量随林龄的变化规律。结果表明：樟子松人工林土壤C/N含量表现为过熟林>中林龄>幼林龄>成熟林，C/P含量表现为过熟林>幼林龄>中林龄>成熟林，N/P随着林龄增加先降低后升高，C/P、C/N、N/P含量最低值均出现在生长速度最快的成熟林，最高值均出现在过熟林。表明沙地樟子松人工林在成熟林以前，土壤磷含量满足樟子松人工林的生长需求。在过熟林阶段碳含量出现累积，土壤磷增长量低于碳增长量，致使过熟林时期樟子松人工林增长速率下降，磷成为过熟林时期樟子松生长限制因子。

关键词 樟子松;林龄;土壤;化学计量

中图分类号 S791.253文献标识码 A

文章编号 0517-6611（2021）02-0091-04

doi：10.3969/j.issn.0517-6611.2021.02.026

开放科学（资源服务）标识码（OSID）：

Effect of Pinus sylvestris var.mongolica Plantation Growth on Stoichiometry of Soil Carbon，Nitrogen and Phosphorus

LI Yao，LEI Zeyong，YU Dongwei et al （Liaoning Technology University，Fuxin，Liaoning 123000）

Abstract Based on the Pinussylvestris plantation in different growth stages （young forest，middleaged forest，mature forest and overmature forest） in Horqin Sandy Land，the change rules of soil carbon，nitrogen and phosphorus stoichiometry with forest age in the 0-100cm layer were investigated in this paper.The results demonstrated that the value of C/N in the P.sylvestris plantation soil was overmature forest>middleaged forest>young forest>mature forest，the value of C/P was overmature forest>young forest>middleaged forest>mature forest，and N/P firstly decreased and then increased with the forest age.The lowest C/P，C/N and N/P ratios appeared in the mature forest stage，and the highest ratios in the overmature forest stage，suggesting that before the mature forest stage，soil phosphorus contents can meet the growth needs of the P.sylvestris plantation.In the overmature forest stage，carbon content accumulated and the growth of phosphorus was lower than that of carbon，which led to the decline in the growth rate of P.sylvestris plantation.Therefore，phosphorus became the growthlimiting factors of P.sylvestris at the overmature forest stage.

Key words Mongolica;Forest age;Soil;Stoichiometry

土壤有機质和碳氮磷比是衡量生态系统中土壤碳素、氮素、磷素总结合的变异性比值，是衡量土壤有机质的组成和影响土壤生态系统质量的重要指标。该变异性指标很好地综合了土壤在生态系统中各种功能的变异性，容易用于科学测量，而且有助于科学研究确定土壤生态过程对于全球气候变化的响应，因而氮磷成为科学研究确定和预测土壤有机质和碳素系统中氮磷的平衡稳定性特征的一个重要参数[1]。1968年Reiner集合了前人的大量科学研究和结果，提出了生态统计化学理论和计量生态学理论在我国生态学研究中的重要应用——生态化学属于计量学，并且首次结合生态统计化学理论和计量生态学的理论模型提出了计量生态学理论研究的重要理论和模型。曾德慧等[2]率先将这一……