不同林龄木荷叶片-细根-土壤碳氮磷化学计量及稳态性特征

doi:10.13287/j.1001-9332.202503.006

应用生态学报 ›› 2025, Vol. 36 ›› Issue (3): 738-746.doi: 10.13287/j.1001-9332.202503.006

不同林龄木荷叶片-细根-土壤碳氮磷化学计量及稳态性特征

姚舒舒¹, 钟全林^1,2,3*, 蔡世锋⁴, 苏孙卿⁴, 梁锋娜¹, 徐朝斌^2,3, 程栋梁^1,2,3, 陈远望¹, 唐磊¹

¹福建师范大学地理科学学院, 福州 350007;
²湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
³福建师范大学福建省植物生理生态重点实验室, 福州 350007;
⁴尤溪国有林场, 福建尤溪 365100

收稿日期:2024-11-08 接受日期:2025-01-10 出版日期:2025-03-18 发布日期:2025-05-15
通讯作者: * E-mail: qlzhong@126.com
作者简介:姚舒舒, 女, 2000年生, 硕士研究生。主要从事植物生理生态研究。E-mail: ssyao21@163.com
基金资助:
国家自然科学基金项目(32371859,32071555)、中央财政项目(闽2023TG29)、福建省科技厅产学合作项目(2023N5006)、福建省自然科学基金项目(2022J011138)和福建省林业局科技项目(2022FKJ24,2023FKJ29)

C:N:P stoichiometry and homeostasis in leaf, fine root, and soil of Schima superba under different stand ages

YAO Shushu¹, ZHONG Quanlin^1,2,3*, CAI Shifeng⁴, SU Sunqing⁴, LIANG Fengna¹, XU Chaobin^2,3, CHENG Dongliang^1,2,3, CHEN Yuanwang¹, TANG Lei¹

¹College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;
²State Key Laboratory Breeding Base of Humid Subtropical Mountian Ecology, Fuzhou 350007, China;
³Fujian Province Key Laboratory of Plant Ecophysiology, Fujian Normal University, Fuzhou 350007, China;
⁴Youxi National Forest Farm, Youxi 365100, Fujian, China

Received:2024-11-08 Accepted:2025-01-10 Online:2025-03-18 Published:2025-05-15

摘要/Abstract

摘要： 为了解不同林龄木荷人工林生态系统的养分特征及稳定机制,本研究以福建省尤溪县8、13、27、36和54年生5个年龄木荷人工纯林为对象,探讨其叶片-细根-土壤碳(C)、氮(N)、磷(P)及化学计量变化特征,分析木荷叶片和细根两构件与土壤的耦合关系和稳态性特征。结果表明: 随着林龄增加,木荷叶片和细根C、N、P含量总体呈先降后升的变化趋势,叶片和细根的N、P含量最小值均出现在13年生,N含量分别为10.38和3.45 g·kg^-1,P含量为0.44和0.21 g·kg^-1。两构件C:N、C:P随林龄增加呈先增后减变化,均在13年生达到最大值。随着林龄的增加,林地土壤 C、N和P含量均呈下降-上升-下降的变化特征,且均以13年生为最低,分别为34.27、1.82和0.11 g·kg^-1;土壤C:N、C:P和N:P最大值均出现在13年生,分别为19.2、315.8和17.0。木荷叶片和细根的N、P含量及其计量比与土壤P含量有显著的相关关系,与土壤C、N含量的相关性不显著。叶片与细根C、N及N:P的稳态性模型回归结果均不显著,具有绝对稳态,且叶片N、P及其计量比的稳态性均小于细根,但叶片和细根P及C:P对土壤P含量变化较为敏感。综上,13年为木荷的速生期;在木荷生长过程中,土壤P含量显著影响木荷叶片与细根N、P含量,叶片对土壤中P含量变化更敏感,建议适时添加P肥以改善土壤质量,并重点关注叶片N、P含量的变化状况。

关键词: 林龄, 化学计量特征, 内稳态性, 木荷

Abstract: To understand nutrient characteristics and stabilization mechanisms of Schima superba plantations with different stand ages, we took stands with five age classes (8, 13, 27, 36, and 54 a) in Youxi County, Fujian Province as the research objects, to explore the variations of carbon (C), nitrogen (N), and phosphorus (P) and their stoichiometric relationships in leaf, fine root, and soil. We further ananlyzed the coupling and homeostasis characteristics between the two components of leaf and fine root of S. superba and soil. The results showed that the C, N, and P contents in leaf and fine root showed a general trend of decreasing and then increasing with the increases of stand age. The minimum values of N (10.38 and 3.45 g·kg^-1) and P contents (0.44 and 0.21 g·kg^-1) of leaf and fine root appeared at the stand with age of 13 a. The C:N and C:P of those two components increased and then decreased with increasing stand age, and both of them reached their maximum values at 13 a. With the increase of stand age, soil C, N, and P contents of woodland showed a pattern of decreasing-increasing-decreasing. All of them were the lowest at 13 a, with 34.27, 1.82, and 0.11 g·kg^-1, respectively; while the maximum values of soil C:N, C:P, and N:P appeared at 13 a, with 19.2, 315.8, and 17.0, respectively. The N and P contents and their stoichiometric ratios of leaf and fine root had significant correlations with soil P content and but not with soil C and N contents. Steady-state model regressions of leaf and fine root C, N, and N:P were all non-significant with absolute stability; and N, P and their stoichiometric ratio of leaf were smaller than those of fine root, but P and C:P of leaf and fine root were more sensitive to change in soil P content. In summary, 13-a was the fast-growing period of S. superba. Soil P content significantly affected leaf and fine root N and P content of S. superba, with the leaf being more sensitive to the variations of soil P content. It was recommended that P fertilizer should be added at the appropriate time to improve soil fertility and focus on the changing of foliar N and P contents.

Key words: stand age, stoichiometric characteristics, homoeostasis, Schima superba

姚舒舒, 钟全林, 蔡世锋, 苏孙卿, 梁锋娜, 徐朝斌, 程栋梁, 陈远望, 唐磊. 不同林龄木荷叶片-细根-土壤碳氮磷化学计量及稳态性特征[J]. 应用生态学报, 2025, 36(3): 738-746.

YAO Shushu, ZHONG Quanlin, CAI Shifeng, SU Sunqing, LIANG Fengna, XU Chaobin, CHENG Dongliang, CHEN Yuanwang, TANG Lei. C:N:P stoichiometry and homeostasis in leaf, fine root, and soil of Schima superba under different stand ages[J]. Chinese Journal of Applied Ecology, 2025, 36(3): 738-746.

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不同林龄木荷叶片-细根-土壤碳氮磷化学计量及稳态性特征

C:N:P stoichiometry and homeostasis in leaf, fine root, and soil of Schima superba under different stand ages

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