科尔沁沙地杨树人工林植物-土壤C、N、P化学计量变化

doi:10.13292/j.1000-4890.202401.023

生态学杂志 ›› 2024, Vol. 43 ›› Issue (1): 162-169.doi: 10.13292/j.1000-4890.202401.023

科尔沁沙地杨树人工林植物-土壤C、N、P化学计量变化

王凯^1,2*,邢仕奇¹,张日升^3,4,吕林有³,刘畅¹

（¹辽宁工程技术大学环境科学与工程学院，辽宁阜新 123000； ²辽宁清原森林生态系统国家野外科学观测研究站，沈阳 110016； ³辽宁省沙地治理与利用研究所，辽宁阜新 123000； ⁴辽宁章古台科尔沁沙地生态系统国家定位观测研究站，辽宁阜新 123000）

出版日期:2024-01-10 发布日期:2024-01-10

Changes in C, N, and P stoichiometry of soil and plant of poplar plantations in Horqin Sandy Land.

WANG Kai^1,2*, XING Shiqi¹, ZHANG Risheng^3,4, LYU Linyou³, LIU Chang¹

(¹College of Environmental Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China; ²Qingyuan Forest, National Observation and Research Station, Shenyang 110016, China; ³Liaoning Institute of Sandy Land Control and Utilization, Fuxin 123000, Liaoning, China; ⁴Liaoning Zhanggutai Desert Ecosystem Research Station, Fuxin, 123000, Liaoning, China).

Online:2024-01-10 Published:2024-01-10

摘要/Abstract

摘要： 为探明科尔沁沙地杨树造林后碳（C）、氮（N）、磷（P）化学计量变化规律，阐明林分发育对植物-土壤间元素循环的影响，以杨树幼树和成年树为对象，分析杨树不同器官（叶、茎、根）、枯落叶和土壤C、N、P含量及其比值，计算N、P重吸收效率，研究植物与土壤间C、N、P的相关性。结果表明：杨树幼树N和P含量表现为叶>根>枝，而成年树为叶和枝>根；幼树叶和枝C∶N、C∶P和N∶P、根N和P含量高于成年树，而枝N含量、叶和枝P含量、根C∶N和C∶P低于成年树。幼树枯落叶N和P含量低于成年树，而C∶N和C∶P高于成年树。幼树N重吸收效率更高，而成年树P重吸收效率更高。杨树造林后0～40 cm土层土壤C和N含量升高，P含量下降。杨树枝和根N、P含量分别与土壤N、P含量呈正相关。因而，杨树幼树将更多N、P供给到根系，减少枯落叶N、P损失，促进植物体快速生长；而成年树则将更多N、P供给到枝叶，增加枯落叶N、P归还土壤，促进植物-土壤间养分循环。科尔沁沙地杨树幼树生长主要受N限制，而成年树主要受P限制。

关键词: 养分限制, 器官, 幼树, 大树, 氮磷循环, 防护林

Abstract: To understand the variations of carbon (C), nitrogen (N), and phosphorus (P) stoichiometry in poplar plantation and the effects of stand development on the element cycle between plant and soil, we measured C, N, and P concentrations and their ratios in different organs (leaf, stem, and root), leaf litter and soil in young and mature poplar plantations. N and P resorption efficiencies were calculated, and the correlations of C, N, and P between plant and soil were explored. The results showed that N and P concentrations decreased in the order of leaf>root>branch for young trees, whereas they were higher in leaves and branches than roots in mature trees. C∶N, C∶P, and N∶P in leaves and branches, and N and P concentrations in roots were higher, but N concentrations in branches, P concentrations in leaves and branches, and C∶N and C∶P in roots were lower in young trees than in mature trees. Leaf litter N and P concentrations of young trees were lower than those of mature trees, while C∶N and C∶P of young trees were higher than those of mature trees. N resorption efficiency was higher but P resorption efficiency was lower in young trees than in mature trees. Soil C and N concentrations increased but soil P concentrations decreased at 0-40 cm layer after poplar afforestation. N and P concentration in both branch and root was positively correlated with soil N and P concentration, respectively. These results indicated that young poplar trees tended to supply more N and P to roots, and decrease the loss of N and P in leaf litter, which would contribute to rapid growth. However, mature trees allocated more N and P to leaves and branches, and increased the return of N and P from leaf litter to soil, so as to promote the nutrient cycle between trees and soil. The growth of young poplar trees was mainly restricted by N, while that of mature trees was mainly restricted by P in Horqin Sandy Land.

Key words: nutrient limitation, organ, seedling, mature tree, nitrogen and phosphorus cycling, shelter forest

王凯, 邢仕奇, 张日升, 吕林有, 刘畅. 科尔沁沙地杨树人工林植物-土壤C、N、P化学计量变化[J]. 生态学杂志, 2024, 43(1): 162-169.

WANG Kai, XING Shiqi, ZHANG Risheng, LYU Linyou, LIU Chang. Changes in C, N, and P stoichiometry of soil and plant of poplar plantations in Horqin Sandy Land.[J]. Chinese Journal of Ecology, 2024, 43(1): 162-169.

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科尔沁沙地杨树人工林植物-土壤C、N、P化学计量变化

Changes in C, N, and P stoichiometry of soil and plant of poplar plantations in Horqin Sandy Land.

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