Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China; Key Laboratory of Tree Breeding and Cultivation National Forestry and Grassland Administration, Beijing 100091, China.
Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China.
Sci Total Environ. 2020 Jun 25;723:137868. doi: 10.1016/j.scitotenv.2020.137868. Epub 2020 Mar 26.
Carbon (C), nitrogen (N), and phosphorus (P) are commonly used to evaluate soil quality. However, still little is known about the effects of human activities on soil C, N, and P. In this study, we compared the stoichiometric characters of soil C, N, and P in a mature Chinese fir (C. lanceolata) plantation under four forest management approaches: uncut as a control (NC), clear-cutting (CC), controlled burning after clear-cutting (CCB) and conversion into a tea garden (TG). We measured the total C (TC), total N (TN), and total P (TP) contents and evaluated the ratios of C:N, C:P, N:P, and C:N:P in each treatment. The results showed that: (1) the contents of TC and TN in all management approaches decreased with increasing soil depth, while the TP content in NC, CC, and CCB decreased at first, then increased. More importantly, there was no significant difference in TP content under the four management approaches. (2) The ratios of C:N, C:P, N:P, and C:N:P decreased with increasing soil depth. Interestingly, the ratio of C:N was lower than that of C:P in every management approach. (3) Despite the different management approaches (NC, CC, CCB, and TG), the ratios of soil C:N:P were relatively stable, which were 24:4:1, 26:4:1, 21:3:1, and 21:3:1, respectively. CCB showed the greatest negative effect on soil TC, TN, and TP contents, suggesting it might be beneficial to avoid this approach for Chinese fir management.
碳（C）、氮（N）和磷（P）通常用于评估土壤质量。然而，人们对人类活动对土壤 C、N 和 P 的影响仍然知之甚少。在这项研究中，我们比较了四种森林管理措施下成熟杉木（C. lanceolata）人工林土壤 C、N 和 P 的化学计量特征：不砍伐作为对照（NC）、皆伐（CC）、皆伐后控制燃烧（CCB）和转换为茶园（TG）。我们测量了总 C（TC）、总 N（TN）和总 P（TP）含量，并评估了各处理中 C:N、C:P、N:P 和 C:N:P 的比值。结果表明：（1）所有管理措施下 TC 和 TN 含量随土壤深度的增加而降低，而 NC、CC 和 CCB 中的 TP 含量先降低后升高。更重要的是，四种管理措施下 TP 含量无显著差异。（2）C:N、C:P、N:P 和 C:N:P 的比值随土壤深度的增加而降低。有趣的是，在每种管理措施下，C:N 的比值都低于 C:P 的比值。（3）尽管管理措施不同（NC、CC、CCB 和 TG），但土壤 C:N:P 的比值相对稳定，分别为 24:4:1、26:4:1、21:3:1 和 21:3:1。CCB 对土壤 TC、TN 和 TP 含量的负面影响最大，表明在杉木管理中应避免这种方法。
