山西农业大学学报（自然科学版）2026，Vol.46Issue(4)：49-58,10.DOI:10.13842/j.cnki.issn1671-8151.202507014
两个海拔范围内不同径级油松根系的非结构性碳水化合物
Non-structural carbohydrates in roots of Pinus tabulaeformis across different diameter classes within two elevation ranges
摘要
Abstract
[Objective]With the increasing frequency,intensity,and duration of environmental stress events such as drought caused by climate change,the allocation and storage of non-structural carbohydrates(NSCs)in various plant organs have be-come a research hotspot in recent years.This study aimed to understand the differences in NSC content within the root systems of Pinus tabulaeformis across different diameters at breast height(DBH)classes,as well as the influences of root order and ele-vation.[Methods]This study was conducted in artificially planted P.tabulaeformis stands on the eastern edge of the Loess Plateau,China.The contents of soluble sugar,starch,and total NSC,along with the soluble sugar to starch(S/S)ratio were measured across two elevation ranges.The sampled roots included first-order roots(<0.2 mm),fine roots excluding first-or-der roots(0.2～2 mm),and coarse roots(>2 mm)from individual trees across three DBH classes.The effects of DBH class,root diameter class,altitudinal range and their interactions on root NSC and its components were tested by ANOVA analysis.The relationships between NSC and its components of different root diameter classes and altitude were examined by simple regression analysis.[Results]The contents of soluble sugar and NSC in the roots of P.tabulaeformis increased signifi-cantly with the increase of DBH.However,starch content was identical in the roots of the trees with a DBH of>10 cm and 5～10 cm,both of which were significantly greater than those with a DBH of<5 cm.Root starch content increased significantly with the increase of root diameter,whereas soluble sugar content,total NSC content,and S/S ratio were significantly higher in fine roots(<2 mm)than in coarse roots(>2 mm).Furthermore,these values in fine roots of 0.2～2 mm were also signifi-cantly higher than those of first-order roots.At lower elevations,soluble sugar content,total NSC content,and the S/S ratio in the roots were significantly higher than at higher elevations.While starch content showed no overall elevational difference,trees with a DBH of<5 cm exhibited significantly lower root starch content at lower elevations than at higher elevations,which was primarily driven by a significant reduction of starch in coarse roots(>2 mm).Simple regression analysis showed that the soluble sugar and total NSC contents in first-order roots increased significantly with decreasing elevation.[Conclusion]The rela-tionship between root soluble sugar content and elevation showed that P.tabulaeformis could adapt to the widespread soil drought stress on the Loess Plateau through root osmoregulation.While coarse roots(>2 mm)store more starch,the lower starch reserves observed in small DBH trees at low altitude may hinder their recovery and survival following severe soil drought events.关键词
油松/径级/根序/NSC/海拔/土壤干旱Key words
Pinus tabulaeformis/DBH class/Root order/NSC/Elevation/Soil drought分类
农业科技引用本文复制引用
高志明,刘宁,梁波,王芳..两个海拔范围内不同径级油松根系的非结构性碳水化合物[J].山西农业大学学报（自然科学版）,2026,46(4):49-58,10.基金项目
国家自然科学基金(31670630) （31670630）
山西省基础研究计划(202103021223151) （202103021223151）
