油松与榆树人工林植物-凋落叶-土壤碳、氮、磷化学计量特征

doi:10.13292/j.1000-4890.202203.020

生态学杂志 ›› 2022, Vol. 41 ›› Issue (3): 427-434.doi: 10.13292/j.1000-4890.202203.020

油松与榆树人工林植物-凋落叶-土壤碳、氮、磷化学计量特征

王凯^1*,齐悦彤¹,刘建华²,焦向丽³,刘焕彬⁴

（¹辽宁工程技术大学环境科学与工程学院，辽宁阜新 123000；²辽宁省沙地治理与利用研究所，辽宁阜新 123000；³湖北省工程咨询股份有限公司，武汉 430071；⁴建平县林业和草原局，辽宁建平 122400）

出版日期:2022-03-10 发布日期:2022-03-07

Carbon, nitrogen and phosphorus stoichiometric characteristics of plants, leaf litter and soils in Pinus tabuliformis and Ulmus pumila plantations

WANG Kai^1*, QI Yue-tong¹, LIU Jian-hua², JIAO Xiang-li³, LIU Huan-bin⁴

(¹College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; ²Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China; ³Hubei Province Engineering Consulting Co., Ltd, Wuhan 430071, China; ⁴Jianping Forestry and Grassland Bureau, Jianping 122400, Liaoning, China).

Online:2022-03-10 Published:2022-03-07

摘要/Abstract

摘要： 以科尔沁沙地油松与榆树人工林为对象，比较植物器官（叶、枝和细根）、凋落叶和土壤（0～10、10～20、20～40 cm土层）的C、N、P含量及其计量比，分析2树种叶片N、P重吸收效率，探讨油松与榆树人工林养分循环特征。结果表明：油松各器官C、N、P含量为493～577、6.34～17.22、0.66～1.91 g·kg^-1，叶和枝C和P含量高于细根，N含量为叶>枝>细根；随着叶片和枝条年龄增加，N和P含量逐渐降低，C∶N和C∶P逐渐升高。榆树各器官C、N、P含量为404～472、3.22～17.45、1.73～3.48 g·kg^-1，叶和枝C含量高于细根，N和P含量为叶>枝>细根。油松叶、枝和细根C含量、C∶P和N∶P、细根N含量及叶和枝C∶N高于榆树，而叶、枝和细根P含量、叶N含量及细根C∶N低于榆树。油松凋落叶C含量、C∶N、C∶P和N∶P高于榆树，而N和P含量低于
榆树。油松P重吸收效率大于榆树。油松林土壤C、N、P含量（2.47～5.52、0.21～0.53、0.015～0.063 g·kg^-1）低于榆树林（4.82～12.22、0.41～1.10、0.075～0.081 g·kg^-1）。因此，油松分配到枝叶的养分较多，P重吸收效率更高，从而减少对土壤P的依赖；而榆树养分分配到叶片更多，通过凋落叶将N、P归还土壤，促进植物-凋落叶-土壤间的养分循环。

关键词: 养分循环, 器官, 养分重吸收, 种间差异, 科尔沁沙地

Abstract: In this study, we analyzed the concentrations of C, N and P in plant organs (leaf, branch and fine root), leaf litter and soils (0-10, 10-20, and 20-40 cm soil layer) in Pinus tabuliformis and Ulmus pumila plantations. Foliar N and P resorption efficiencies were calculated, and the nutrient cycling characteristics of the twoplantations were discussed. The results showed that concentrations of C, N and P in different organs of P.tabuliformis were 493-577, 6.34-17.22 and 0.66-1.91 g·kg^-1. The C and P concentrations of leaves and branches were higher than those of fine roots, while N concentrations followed the rank of leaf > branch > fine root. With the increased leaf and branch age of P. tabuliformis, N and P concentrations gradually decreased, while C∶N and C∶P gradually increased. The C, N and P concentrations in different organs of U. pumila were 404-472, 3.22-17.45 and 1.73-3.48 g·kg^-1. C concentrations were higher in leaves and branches than in fine roots, while N and P concentrations followed the rank of leaf > branch > fine root. C concentrations, C∶P and N∶P in leaves, branches and fine roots, and N concentrations in fine roots, and C∶N in leaves and branches of P.tabuliformis were higher than those of U. pumila, while P concentrations in leaves, branches and fine roots, N concentrations in leaves and C∶N in fine roots of P.tabuliformis were lower than those of U. pumila. Leaf litter C concentration, C∶N, C∶P, and N∶P were higher but N and P concentrations were lower in P. tabuliformis than in U. pumila. P resorptionefficiency was higher in P. tabuliformisthan in U. pumila. Soil C, N and P concentrations were lower in P. tabuliformis plantation (2.47-5.52, 0.21-0.53 and 0.015-0.063 g·kg^-1) than in U. pumila plantation (4.82-12.22, 0.41-1.10 and 0.075-0.081 g·kg^-1). These results indicated that relatively more nutrients were allocated to leaves and branches and higher P resorption efficiency in P. tabuliformis plantation, resulting in less dependence on soil P. U. pumila allocated more nutrients to leaves and that returned to the soil through leaf litter, which were beneficial for nutrient cycling in plant-litter soil systems.

Key words: nutrient cycle, organ, nutrient resorption, interspecific difference, Horqin Sandy Land.

王凯, 齐悦彤, 刘建华, 焦向丽, 刘焕彬. 油松与榆树人工林植物-凋落叶-土壤碳、氮、磷化学计量特征[J]. 生态学杂志, 2022, 41(3): 427-434.

WANG Kai, QI Yue-tong, LIU Jian-hua, JIAO Xiang-li, LIU Huan-bin. Carbon, nitrogen and phosphorus stoichiometric characteristics of plants, leaf litter and soils in Pinus tabuliformis and Ulmus pumila plantations[J]. Chinese Journal of Ecology, 2022, 41(3): 427-434.

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油松与榆树人工林植物-凋落叶-土壤碳、氮、磷化学计量特征

Carbon, nitrogen and phosphorus stoichiometric characteristics of plants, leaf litter and soils in Pinus tabuliformis and Ulmus pumila plantations

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