不同密度下沙地樟子松碳、氮、磷化学计量及养分重吸收特征

doi:10.13292/j.1000-4890.202102.016

生态学杂志 ›› 2021, Vol. 40 ›› Issue (2): 313-322.doi: 10.13292/j.1000-4890.202102.016

不同密度下沙地樟子松碳、氮、磷化学计量及养分重吸收特征

王凯^1*,那恩航¹,张日升²,高爽¹,刘建华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辽宁省沙地治理与利用研究所，辽宁阜新 123000）

出版日期:2021-02-10 发布日期:2021-07-09

Carbon, nitrogen and phosphorus stoichiometry and nutrient resorption of Pinus sylvestris var. mongolica under different densities.

WANG Kai^1*, NA En-hang¹, ZHANG Ri-sheng², GAO Shuang¹, LIU Jian-hua²#br#

(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).

Online:2021-02-10 Published:2021-07-09

摘要/Abstract

摘要： 以樟子松纯林为对象，研究了6种密度（490、750、1110、1550、1930、2560株·hm^-2）下不同器官（当年生叶、一年生叶、当年生枝、一年生枝和细根）的C、N、P化学计量特征及叶片N、P重吸收效率。结果表明：随着林分密度增加，当年生和一年生叶C含量及当年生和一年生枝P含量呈降低趋势（1550株·hm^-2除外），当年生枝、一年生枝和细根C含量、各器官N含量及当年生叶、一年生叶和细根P含量呈先升高后降低趋势，在1550株·hm^-2密度下最高；当年生叶、一年生叶和细根C∶N、当年生叶和枝C∶P以及当年生叶、当年生和一年生枝N∶P呈先降低后升高趋势，一年生叶和枝C∶P呈升高趋势；凋落叶C含量先增加后降低，N含量呈升高趋势，P含量先降低后升高；叶片N重吸收效率下降，P重吸收效率先升高后降低，N重吸收效率:P重吸收效率呈下降趋势。因此，随樟子松林分密度增加，N限制减弱，P限制增强。当林分密度为1550株·hm^-2时，养分更多分配到叶片和细根，促进高生长，为樟子松人工林适宜经营密度。

关键词: 樟子松人工林, 器官差异, 密度调控, 养分分布格局, 科尔沁沙地

Abstract: We examined the carbon (C), nitrogen (N) and phosphorus (P) stoichiometry in different organs (current-year needle, one-year-old needle, current-year branch, one-year-old branch, and fine root) along with the N and P resorption efficiencies in needles of Pinus sylvestris var. mongolica in pure forest with six densities (490, 750, 1110, 1550, 1930 and 2560 trees·hm^-2). The results showed that C concentrations in the current-year and one-year-old needles and P concentrations in the current-year and one-year-old branches exhibited downward trends with increasing stand density, except for the 1550 trees·hm^-2 stand. With the increases of stand density, C concentrations in current-year branch, one-year-old branch and fine root, the N concentrations in all organs, and P concentrations in current-year needle, one-year-old needle and fine root tended to increase and then decrease, with the highest values in the 1550 trees·hm^-2 stand. The C∶N in current-year needle, one-year-old needle and fine root, C∶P in current-year needle and branch, and N∶P in current-year needle, current-year and one-year-old branches displayed decreasing and then increasing trends with increasing stand density, whereas C∶P in one-year-old needle and branch showed an upward trend. With increasing stand density, C concentrations in leaf litter increased and then decreased, N concentrations exhibited an increasing trend, and P concentrations decreased and then increased. With increasing stand density, N resorption efficiency and the ratio of N resorption efficiency to P resorption efficiency decreased, and P resorption efficiency increased and then decreased. These findings indicated that N limitation weakened but P limitation enhanced with increasing stand density. The optimal management density for P. sylvestris var. mongolica stand should be 1550 trees·hm^-2, in which more nutrients are allocated to needles and fine roots and thus contribute to high growth rate.

Key words: Pinus sylvestris var.mongolica plantation, organ difference, density control, nutrient distribution pattern, Horqin sandy land.

王凯, 那恩航, 张日升, 高爽, 刘建华. 不同密度下沙地樟子松碳、氮、磷化学计量及养分重吸收特征[J]. 生态学杂志, 2021, 40(2): 313-322.

WANG Kai, NA En-hang, ZHANG Ri-sheng, GAO Shuang, LIU Jian-hua. Carbon, nitrogen and phosphorus stoichiometry and nutrient resorption of Pinus sylvestris var. mongolica under different densities.[J]. Chinese Journal of Ecology, 2021, 40(2): 313-322.

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不同密度下沙地樟子松碳、氮、磷化学计量及养分重吸收特征

Carbon, nitrogen and phosphorus stoichiometry and nutrient resorption of Pinus sylvestris var. mongolica under different densities.

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