Jiangxi Provincial Key Laboratory of Silviculture, College of Forestry, Jiangxi Agricultural University, Nanchang, China.
PLoS One. 2020 Sep 4;15(9):e0238227. doi: 10.1371/journal.pone.0238227. eCollection 2020.
Intensive management of C. oleifera has produced many pure C. oleifera plantations. The transmission of C. oleifera plantation will potentially affect soil C, N, and P pools as well as their stoichiometric characteristics both in top soil layer and vertical soil profile due to the intensive management. To understand changes in vertical pools and stoichiometric characteristics of soil C, N, and P as affected by intensive management of C. oleifera plantations, both mixed and pure C. oleifera plantations were studied. We conducted studies in five locations in Jiangxi, China with both pure and mixed C. oleifera plantations, to compare changes in vertical pools and stoichiometry of C, N, and P. Both C and N pools were significantly different between mixed and pure plantation types of C. oleifera. However, the ratio of C:N, C:P, and N:P was consistently higher in mixed plantations with C:P and N:P altered but C:N ratio did not change with soil depth. The intensive management significantly impact both C and N pools and the stoichiometry of C, N, and P. Intensive management of C. oleifera plantations decreased both C and N pools, especially at the depth of 30-50 cm soil layer. C. oleifera plantation alteration from mixed to pure should be considered in future forest management practice considering the substantial effects on soil element cycling and distribution along vertical soil profile.
集约管理的油茶树已产生了许多纯油茶树人工林。由于集约管理，油茶树人工林的传播可能会影响表土层和垂直土壤剖面中土壤 C、N 和 P 库及其化学计量特征。为了了解集约管理对油茶树人工林土壤 C、N 和 P 垂直分布和化学计量特征的影响，对混交和纯油茶树人工林进行了研究。我们在中国江西的五个地点进行了研究，包括纯油茶树和混交油茶树人工林，以比较垂直分布和 C、N、P 的化学计量特征的变化。C 和 N 库在混交和纯油茶树人工林之间有显著差异。然而，C:P 和 N:P 的比例在混交林中始终较高，C:P 和 N:P 发生了变化，但 C:N 比例随土壤深度没有变化。集约管理对 C、N 库以及 C、N、P 的化学计量特征有显著影响。油茶树人工林的集约管理降低了 C 和 N 库，尤其是在 30-50cm 土层深度。在未来的森林管理实践中，应考虑将油茶树人工林从混交转变为纯交，因为这会对土壤元素沿垂直土壤剖面的循环和分布产生重大影响。
