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生态学杂志 ›› 2022, Vol. 41 ›› Issue (5): 849-857.doi: 10.13292/j.1000-4890.202203.012

• 研究报告 • 上一篇    下一篇

平茬高度对云南松苗木碳氮磷化学计量特征的影响

蔡年辉1,2,唐军荣1,2,车凤仙3,陈诗1,2,王军民1,2,许玉兰1,2,李根前1,2*   

  1. (1西南林业大学, 西南山地森林资源保育与利用教育部重点实验室, 昆明 650224; 2西南林业大学, 西南地区生物多样性保育国家林业局重点实验室, 昆明 650224; 3弥渡县林木良种培育站, 云南弥渡 675600)
  • 出版日期:2022-05-10 发布日期:2022-10-10

Effects of stumping height on carbon, nitrogen, and phosphorus stoichiometry in different organs of Pinus yunnanensis seedlings.

CAI Nian-hui1,2, TANG Jun-rong1,2, CHE Feng-xian3, CHEN Shi1,2, WANG Jun-min1,2, XU Yu-lan1,2, LI Gen-qian1,2*   

  1. (1Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming 650224, China; 2Key Laboratory of Biodiversity Conservation in Southwest China, State Forestry Administration, Southwest Forestry University, Kunming 650224, China; 3Tree Breeding Station of Midu County Forestry Bureau, Midu 675600, Yunnan, China).
  • Online:2022-05-10 Published:2022-10-10

摘要: 为了解平茬对云南松(Pinus yunnanensis)苗木各器官碳(C)、氮(N)、磷(P)含量及其化学计量特征的影响,探讨C、N、P含量间的相关关系及其异速生长关系,本研究对不同平茬高度(对照、5、10和15 cm)的云南松苗木采样测定,分析主根、侧根、茎、侧枝、母株针叶、萌条枝、萌条针叶共7个器官的C、N、P含量及其C∶N、C∶P、N∶P值。结果表明:除C含量在平茬高度间无显著差异外,N含量、P含量、C∶N、C∶P、N∶P在平茬高度、器官、平茬高度×器官间均存在极显著差异;随着平茬高度的增加,N含量、P含量和N∶P呈现先上升后下降趋势,而C∶N和C∶P呈现相反的趋势;不同平茬高度下各器官营养元素含量及比值的变异系数波动低,表明平茬对C、N、P含量及其化学计量稳定性的影响较小;平茬处理下C含量与N、P含量间的相关关系有一定的改变,随着平茬高度的增加,C含量与N、P含量间的相关关系减弱;平茬未改变它们之间的异速生长关系,表现为C的积累速率低于N和P,苗木生长以N调控为主;综合来看,平茬改变植株体内的营养元素含量,进而改变植物体内C、N和P含量的平衡关系,云南松苗木表现以N调控为主,随着平茬高度的增加,苗木对N和P的利用表现为先降低后增加,N受限程度也表现为先降低后增加。

关键词: C∶N∶P, 化学计量, 养分限制, 异速生长

Abstract: To understand the effects of stumping on the contents and stoichiometry of carbon (C), nitrogen (N), and phosphorus (P) in different organs of Pinus yunnanensis seedlings, and the correlations and allometric relationships among C, N and P, the contents of C, N, P and the ratios of C∶N, C∶P and N∶P in seven organs (taproot, lateral root, stem, lateral branch, mother plant needle, sprout branch, sprout needle) of P. yunnanensis seedlings with different stumping heights (CK, 5, 10 and 15 cm) were analyzed. The results showed that N, P, C∶N, C∶P, N∶P had significant differences among stumping heights, organs, stumping heights×organs, except that C content showed no response to stumping height. With the increases of stumping height, N, P, C∶N, C∶P, N∶P showed a trend of first increase and then decrease, while C∶N and C∶P showed an opposite trend. The variation coefficients of contents and ratios of elements in each organ fluctuated slightly under different stumping heights, indicating that stumping had little effect on C, N, P contents and their stoichiometric stability. The correlations between C and N and between C and P changed among different stumping heights, while the correlations between C and N and between C and P were weakened with increasing stumping height. Stumping did not affect the allometric growth relationship between them, with the accumulation rate of C being lower than that of N and P, and the growth of seedlings being mainly regulated by N. In summary, stumping changed nutrient content, and then changed the balance of C, N and P in plants. The performance of P. yunnanensis seedlings was mainly regulated by N. With increasing stumping height, the utilization of N and P in seedlings decreased first and then increased, at the same time the degree of N limitation decreased first and then increased.

Key words: C∶N∶P, stoichiometry, nutrient limitation, allometric growth.