학술논문
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
Document Type
Academic Journal
Author
高慧蓉; 王志波; 龚浩鑫; 朱荣; 杨雪; 陈爽; 王小春; 张明; 王瑞丽; GAO Hui-rong; WANG Zhi-bo; GONG Hao-xin; ZHU Rong; YANG Xue; CHEN Shuang; WANG Xiao-chun; ZHANG Ming; WANG Rui-li
Source
西北林学院学报 / Journal of Northwest Forestry University. 39(1):162-168
Subject
Language
Chinese
ISSN
1001-7461
Abstract
氮(N)是植物生长发育的关键性限制元素,其在植物地上、地下器官间的权衡分配是植物重要的适应策略,目前不同器官N含量的变异规律及分配机制仍不清楚.以秦岭太白山北坡为研究地点,沿海拔梯度选取落叶栎林、桦木林、巴山冷杉林、太白红杉林和高山灌丛带的7 4种木本和草本植物,通过野外取样、室内测定获得叶片和细根的N元素含量,旨在阐明叶片和细根N元素沿海拔梯度的变异规律及N元素在2种器官间的分配策略.结果表明:1)在全部物种和不同生长型中,叶片N含量(21.51～24.21 mg·g-1)均显著高于细根(12.32～13.57 mg·g-1,P＜0.05).2)木本植物细根N含量随海拔升高而逐渐呈降低趋势,而草本植物叶片和细根中的N含量则相反.3)叶片N含量与气候和土壤因素显著相关,而细根N含量有更强的系统发育保守性,且较少受到环境因素的影响.这些结果表明,N元素的变异规律及其驱动因素在不同器官和不同生长型中均存在差异,未来在生态化学计量研究中需要综合考虑植物不同器官和不同生长型对环境变化的适应策略.
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.
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.