Abstract：[Background] This work is to investigate the effects of concentrations and stoichiometric of soil organic C(carbon), total N (nitrogen) and total P (phosphorus) in Pinus tabuliformis plantation at different age stages, and to provide theoretical guidance for the regulation of the growth environment of forests and a reference for the management of soil fertility in forests. [Methods] In June 2018, a survey was conducted in Wendao Forest Farm, Fushun county, Liaoning province, and Pinus tabulaeformis plantations of different forest ages (42, 65, and 85 years) were selected as the research objects. Three plots with a total area of 20 m×20 m (9 plots in total) were set up respectively, and took three soil sample collection points (27 sampling points in total) according to the upper, middle and lower routes. The sampling points were more than 5 m from the boundary. Sampling was conducted according to soil depth of 0-20, >20-40, >40-60 cm at the sampling point. Soil organic C was determined by potassium dichromate oxidation-heating method, soil total N was determined by potassium dichromate sulfuric acid digestion method, the determination of soil total P was determined using a Mo-Sb molten NaOH anti colorimetry. [Results] 1) The contents of soil organic C, total N and total P in 0-60 cm soil layer of P. tabuliformis plantation were 15.73-47.67, 0.40-1.58 and 1.11-2.27 g/kg, which were statistically affected by different stand age and soil depth (P<0.01). Soil organic C and total N increased at initial and then decreased with stand age, and decreased with increasing of soil depth. 2) The C:N, C:P and N:P in 0-60 cm soil layer of P. tabuliformis plantation were 36.19-42.43, 10.40-39.44 and 0.26-1.33. The stand age and the soil depth presented an extremely significant influence on soil C:P and N:P (P<0.01), but no significant influence on soil C:N (P>0.05). 3) There was significant correlation between soil C:N and soil total N, and there was no correlation with soil organic C. Soil C:P was significantly correlated with soil organic C and total P. N:P was significantly correlated with soil total N and total P. [Conclusions] The soil organic C and total N contents in P. tabuliformis plantation in this study increased with the stand age, but they decreased when the stand age reached a certain stage. The mineralization ability of soil N is weak and the soil N is poor, this is very important for the regulation of forest growth environment, and provides a reference for the future management of forest soil fertility.
杨霞, 陈丽华, 郑学良. 不同林龄油松人工林土壤碳、氮和磷生态化学计量特征[J]. 中国水土保持科学, 2021, 19(2): 108-116.
YANG Xia, CHEN Lihua, ZHENG Xueliang. Ecological stoichiometry characterization of soil carbon, nitrogen, and phosphorus of Pinus tabuliformis plantations at different stand ages. SSWC, 2021, 19(2): 108-116.
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2021, Vol. 19 
