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. 2025 Jun;36(6):1699-1707.
doi: 10.13287/j.1001-9332.202506.001.

Characteristics of carbon, nitrogen and phosphorus stoichiometry in litter-root-soil of Pinus sylvestris var. mongolica plantations with different stand ages

Rong-Xiao Wang  1 , Song-An Zhang  1 , Guang-Lei Gao  1   2   3   4   5 , Guo-Dong Ding  1   3   4   5 , Ying Zhang  1   3   4   5 , Bin-Bin Zhu  6
Affiliations

Characteristics of carbon, nitrogen and phosphorus stoichiometry in litter-root-soil of Pinus sylvestris var. mongolica plantations with different stand ages

Rong-Xiao Wang et al. Ying Yong Sheng Tai Xue Bao. 2025 Jun.

Abstract
in English, Chinese

To investigate the carbon (C), nitrogen (N), and phosphorus (P) stoichiometry of the litter-root-soil system and the driving factors for their variations in the Pinus sylvestris var. mongolica plantations, we analyzed the contents and stoichiometric ratios of organic carbon, total nitrogen and total phosphorus in litter, roots and soil across 27-year-old (middle-aged), 38-year-old (nearly-mature) and 47-year-old (mature) plantations in Hulunbuir sandy land, with natural forests as a control. The results showed that with increases of stand age, N and P contents showed a trend of decreasing and then increasing in the decomposing layer of the litter, and the C:N and C:P in semi-decomposing layer were significantly higher in near-mature than in middle-aged and mature plantations. The N content in the semi-decomposing layer of litter in natural forests was 17.3% lower than that in plantations. The N:P in the decomposing layer of natural forests was 16.2% lower than that in plantations. With the increases of stand age, root C content showed an increasing trend, and the N content exhibited a decreasing and then increasing trend. Root C:N of middle-aged was significantly lower than that in near-mature plantations. The root C:P of middle-aged and near-mature was significantly lower than that in mature plantations. Root P content was 41.0% higher than that in natural forests. The soil C and P content as well as the C:N and C:P were significantly lower in plantations than in natural forests. The rhizosphere and bulk soils of natural forests with N:P of 3.7 and 3.1 were significantly lower than that of plantations. Cellulase was the main driver of stoichiometric characteristics of litter, while acid phosphatase was the main driver for both root and soil.

为揭示樟子松人工林枯落物-根系-土壤碳(C)氮(N)磷(P)化学计量特征及其影响因素,以呼伦贝尔沙地27(中龄林)、38(近熟林)和47年生(成熟林)樟子松人工林为研究对象,樟子松天然林为对照,分析枯落物、根系和土壤有机碳、全氮、全磷含量及化学计量比。结果表明: 随林龄增加,樟子松人工林枯落物分解层N、P含量呈先减小后增加趋势,近熟林半分解层C∶N、C∶P显著高于中龄林和成熟林;天然林枯落物半分解层N含量显著低于人工林17.3%,分解层N∶P显著低于人工林16.2%。随林龄增加,人工林根系C含量呈增加趋势,N含量呈先减小后增加趋势;中龄林根系C∶N显著低于近熟林,中龄林和近熟林根系C∶P显著低于成熟林;人工林根系P含量显著高于天然林41.0%。人工林土壤C、P含量以及C∶N、C∶P均显著低于天然林;天然林根际土壤和非根际土壤N∶P分别为3.7和3.1,均显著低于人工林。枯落物化学计量特征变化的主要驱动因子是纤维素酶,根系和土壤则均为酸性磷酸酶。.

Keywords: Pinus sylvestris var. mongolica; natural forest; plantation; stand age; stoichiometric characteristic.

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