磷添加对马尾松幼苗生长及非结构性碳含量的影响

doi:10.13292/j.1000-4890.202509.019

生态学杂志 ›› 2025, Vol. 44 ›› Issue (9): 2864-2872.doi: 10.13292/j.1000-4890.202509.019

磷添加对马尾松幼苗生长及非结构性碳含量的影响

曾婷婷^1,2,张少纯¹,何至杭¹,吴妙兰¹,王艺颖¹,莫其锋^1,3*

（¹华南农业大学林学与风景园林学院，广州 510642； ²北京林业大学林学院，北京 100083； ³中国森林生态系统定位观测研究网络广东鹅凰嶂野外科学观测研究站，广东阳江 529631）

出版日期:2025-09-10 发布日期:2025-09-03

Effects of phosphorus addition on growth and non-structural carbohydrate content of Pinus massoniana seedlings.

ZENG Tingting^1,2, ZHANG Shaochun¹, HE Zhihang¹, WU Miaolan¹, WANG Yiying¹, MO Qifeng^1,3*

(¹College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China; ²College of Forestry of Beijing Forestry University, Beijing 100083, China; ³Guangdong E’huangzhang Field Observation and Research Station, Chinese Forest Ecosystem Research Network, Yangjiang 529631, Guangdong, China).

Online:2025-09-10 Published:2025-09-03

摘要/Abstract

摘要： 氮沉降的加速可能加剧亚热带树种的磷限制。为探究马尾松（Pinus massoniana）幼苗对磷添加的响应，以苗龄为1年生的马尾松为研究对象，设置对照（CK，不加磷）、低磷（LP，50 kg P·hm^-2·a^-1）、高磷（HP，100 kg P·hm^-2·a^-1）3种处理，分析不同磷添加水平对马尾松幼苗生长、生物量积累、非结构性碳水化合物（NSC）和根形态指标的影响。结果表明：（1）磷添加促进了马尾松幼苗各器官生物量的积累，高磷处理下，叶、茎、粗根、细根生物量及总生物量分别显著增加531%、210%、355%、187%、321%；且马尾松幼苗倾向于提高叶生物量的占比来适应土壤磷浓度的变化。（2）磷添加显著增加了马尾松幼苗各器官的NSC含量，随着磷添加水平的提高，叶片NSC的占比逐渐增加，而茎NSC的占比逐渐降低；根系NSC占比整体呈先降低后增加的趋势，但均低于对照处理。（3）磷添加显著增加了粗根和细根的根长、根表面积及根体积，根直径则对磷添加不敏感；在磷添加的条件下，细根采取资源利用型策略。研究表明，马尾松幼苗通过增加各器官生物量、NSC含量，并增加叶片在生物量、NSC含量上的占比来响应外源磷的增加，同时在NSC的分配中存在地上部和地下部的权衡；磷添加促进了幼苗根系的生长，粗根在响应外界变化时存在一定的内稳性。因此，磷添加对马尾松幼苗的生长整体呈正向作用。

关键词: 马尾松, 磷添加, 生物量, 非结构性碳, 根形态构型

Abstract: The acceleration of nitrogen (N) deposition may aggravate phosphorus (P) limitation of subtropical tree species. We explored the response of 1-year-old Pinus massoniana seedlings to different P addition levels \[(without P fertilization, CK), low P (50 kg P·hm^-2·a^-1, LP) and high P (100 kg P·hm^-2·a^-1, HP)\]. The effects of different P addition levels on growth, biomass accumulation, non-structural carbohydrate (NSC), and root morphological indexes of P. massoniana seedlings were analyzed. The results showed that: (1) P addition promoted biomass accumulation in various organs of P. massoniana seedlings. HP treatment led to significant increases of 531%, 210%, 355%, 187%, and 321% in leaf, stem, coarse root, fine root biomass, and total biomass, respectively. Moreover, the proportion of leaf biomass increased in response to changes in soil P concentrations. (2) P addition significantly increased the NSC content in various organs of P. massoniana seedlings, and the NSC proportion in leaves gradually increased while that in stems gradually decreased with increasing in P addition. Root proportion showed a trend of first decreasing then increasing with increasing in P addition, but was lower than that in CK. (3) P addition significantly increased length, surface area, and volume of both coarse and fine roots, while root diameter was insensitive to P addition. Under conditions of P addition, fine roots adopted a resource utilization strategy. Our results indicated that P. massoniana seedlings responded to exogenous P addition by increasing the biomass and NSC content of each organ and increasing the proportion of leaves in biomass and NSC content. There was a trade-off between aboveground and underground parts in NSC distribution. P addition promoted the growth of seedling roots, while the coarse roots had certain internal stability in response to external changes. Therefore, P addition stimulated the growth of P. massoniana seedlings.

Key words: Pinus massoniana, phosphorus addition, biomass, non-structural carbohydrate, root morphological index

曾婷婷, 张少纯, 何至杭, 吴妙兰, 王艺颖, 莫其锋. 磷添加对马尾松幼苗生长及非结构性碳含量的影响[J]. 生态学杂志, 2025, 44(9): 2864-2872.

ZENG Tingting, ZHANG Shaochun, HE Zhihang, WU Miaolan, WANG Yiying, MO Qifeng. Effects of phosphorus addition on growth and non-structural carbohydrate content of Pinus massoniana seedlings.[J]. Chinese Journal of Ecology, 2025, 44(9): 2864-2872.

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磷添加对马尾松幼苗生长及非结构性碳含量的影响

Effects of phosphorus addition on growth and non-structural carbohydrate content of Pinus massoniana seedlings.

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