西北林学院学报2024，Vol.39Issue(1)：162-168,7.DOI:10.3969/j.issn.1001-7461.2024.01.22
太白山植物叶片和细根氮含量沿海拔梯度的变异规律
Changes in Nitrogen Content of Fine Roots and Leaves Along Altitudinal Gradients in the Taibai Mountain
摘要
Abstract
Nitrogen(N)is a key limiting element for plant growth and development,and its trade-off distri-bution between above-and under-ground organs is an important adaptation strategy for plants.However,the variation patterns and allocation mechanisms of N content in different organs are still unclear.Taking the northern slope of the Taibai Mountain in the Qinling Mountains as the research location,74 species of woody and herbaceous plants from deciduous oak forest,birch forest,Abies fargesii forest,Larix potaninii var.chinensis forest and alpine shrubland were selected along the altitudinal gradients.The N contents in leaves and fine roots were obtained through field sampling and indoor measurements.We aimed to elucidate the variation of N element in leaves and fine roots along the altitudinal gradient and the allocation strate-gies between two organs.The results showed that 1)N content in leaves was significantly higher than that in fine roots across all species and different growth types(21.51-24.21 vs.12.32-13.57mg·g-1,P＜0.05).2)The N content in fine roots of woody plants gradually decreased with the increase of altitude,while that in leaves and fine roots of herbaceous plants showed an opposite trend.3)Leaf N content was significantly affected by climatic and soil factors,whereas N content of fine roots had strong phylogenetic conservation and was less affected by environmental factors.These results suggest that the variation in N element and its driving factors differ among different plant organs and growth types.In the future,the ad-aptation strategies of different organs and different growth types of plants to environmental changes need to be comprehensively considered in the ecological chemometric research.关键词
氮含量/叶片/细根/海拔梯度/太白山Key words
nitrogen content/leaf/fine root/altitudinal gradient/the Taibai Mountain分类
农业科技引用本文复制引用
高慧蓉,王志波,龚浩鑫,朱荣,杨雪,陈爽,王小春,张明,王瑞丽..太白山植物叶片和细根氮含量沿海拔梯度的变异规律[J].西北林学院学报,2024,39(1):162-168,7.基金项目
国家自然科学基金(32271611) （32271611）
陕西省高校科协青年人才托举计划项目(20200203). （20200203）
