基于器官凋落叶-土壤生态化学计量特征的樟子松和赤松人工林养分利用策略

doi:10.13292/j.1000-4890.202302.009

生态学杂志 ›› 2023, Vol. 42 ›› Issue (2): 274-281.doi: 10.13292/j.1000-4890.202302.009

基于器官凋落叶-土壤生态化学计量特征的樟子松和赤松人工林养分利用策略

王凯^1,2*,齐悦彤¹,那恩航¹,陶江¹,刘建华³,康宏樟²

（¹辽宁工程技术大学环境科学与工程学院，辽宁阜新 123000； ²上海交通大学设计学院，上海 200240； ³辽宁省沙地治理与利用研究所，辽宁阜新 123000）

出版日期:2023-02-10 发布日期:2023-07-10

Nutrient use strategies of Pinus sylvestris var. mongolica and Pinus densiflora plantations based on ecological stoichiometry in organ-litter-soil systems.

WANG Kai^1,2*, QI Yue-tong¹, NA En-hang¹, TAO Jiang¹, LIU Jian-hua³, KANG Hong-zhang²#br#

#br#

(¹College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; ²School of Design, Shanghai Jiaotong University, Shanghai 200240, China; ³Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China).

Online:2023-02-10 Published:2023-07-10

摘要/Abstract

摘要： 以科尔沁沙地樟子松与赤松人工林为对象，分析不同器官、凋落叶和土壤的C、N、P化学计量，比较研究两个树种的养分保存与利用机制。结果表明：樟子松叶C含量及C∶N、C∶P和N∶P、枝N含量以及根N和P含量显著高于赤松，而叶P含量、枝C∶N、根C含量及C∶N和C∶P显著低于赤松。樟子松N和P含量随枝叶年龄增加而下降，而赤松P含量表现为当年和二年生枝叶显著高于一年生枝叶。樟子松凋落叶C、N、P含量均显著高于赤松，C∶P和N∶P显著低于赤松。赤松叶片P重吸收效率显著高于樟子松，并且两个树种的P重吸收效率显著高于N重吸收效率。樟子松林土壤P含量显著低于赤松林，而C∶N和C∶P显著高于赤松林。樟子松养分主要供给新生组织器官，而老年枝叶的养分保存能力下降，凋落叶更易于分解，不利于土壤养分保存，土壤P含量较低。赤松养分保存能力更强，通过维持较高养分重吸收效率，提高体内养分利用效率，降低对土壤P的消耗。

关键词: 养分限制, 器官差异, 养分重吸收, 树种选择, 科尔沁沙地

Abstract: We analyzed C, N, and P stoichiometry of different plant organs, needle litter and soils in Pinus sylvestris var. mongolica and Pinus densiflora plantations, aiming to explore their nutrient conservation and use mechanisms. The results showed that C concentrations, C∶N, C∶P and N∶P in needles, N concentrations in branches, and N and P concentrations in roots of P. sylvestris var. mongolicawere significantly higher than those of P. densiflora, while P concentrations in needles, branch C∶N, and C concentrations, C∶N and C∶P in roots of P. sylvestris var. mongolica were significantly lower than those of P. densiflora. Concentrations of N and P decreased with increasing age of needle and branch for P. sylvestris var. mongolica, whereas P concentrations were significantly greater in current-year and two-year-old than one-year-old needles and branches for P. densiflora. Concentrations of C, N and P in needle litter of P. sylvestris var. mongolica were significantly higher than those of P. densiflora, while needle litter C∶P and N∶P of P. sylvestris var. mongolica were significantly lower than those of P. densiflora. P resorption efficiency of P. densiflora was significantly greater than that of P. sylvestris var. mongolica. P resorption efficiency was significantly higher than N resorption efficiency for both species. Soil P concentrations were significantly greater in P. sylvestris var. mongolica plantation than in P. tabuliformis plantation, whereas soil C∶N and C∶P were significantly lower in P. sylvestris var. mongolica plantation than in P. densiflora plantation. These results indicated that P. sylvestris var. mongolica tended to allocate more nutrients to newborn tissues, with declining nutrient conservation ability of old branches and needles. The needle litter was easy to decompose, which was not conducive to soil nutrient conservation, and soil P concentrations were low in P. sylvestris var. mongolica plantation. P. densiflora maintained higher nutrient resorption efficiency, and improved the nutrient use efficiency, which exhibited a stronger ability to conserve nutrients and reduced soil P consumption.

Key words: nutrient limitation, organ diversity, nutrient resorption, tree species selection, Horqin sandy land.

王凯, 齐悦彤, 那恩航, 陶江, 刘建华, 康宏樟. 基于器官凋落叶-土壤生态化学计量特征的樟子松和赤松人工林养分利用策略[J]. 生态学杂志, 2023, 42(2): 274-281.

WANG Kai, QI Yue-tong, NA En-hang, TAO Jiang, LIU Jian-hua, KANG Hong-zhang. Nutrient use strategies of Pinus sylvestris var. mongolica and Pinus densiflora plantations based on ecological stoichiometry in organ-litter-soil systems.[J]. Chinese Journal of Ecology, 2023, 42(2): 274-281.

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基于器官凋落叶-土壤生态化学计量特征的樟子松和赤松人工林养分利用策略

Nutrient use strategies of Pinus sylvestris var. mongolica and Pinus densiflora plantations based on ecological stoichiometry in organ-litter-soil systems.

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