内蒙古草原植物根属性的变异格局及环境适应策略

在内蒙古草原沿水分梯度选择 16 个样点, 测定 22 种优势植物根的形态和构型属性, 分析 6 种植物根属性(直径、根长、比根长、组织密度、分支强度和分支比)的变异及其对 4 种环境因子(年均降雨量、年均温、土壤含碳量和土壤含氮量)的响应规律.结果表明: 1) 不同物种间吸收根直径、组织密度和比根长的变异为 7, 9 和 15 倍, 根直径与侧根长度显著正相关, 与分支强度负相关; 2) 吸收根和非吸收根对降水和土壤氮的适应方式具有明显的种间效应, 当利用不同根系属性组合刻画植物适应策略时, 由于随着环境变化, 不同物种根属性产生变异的程度和方向各不相同, 从而形成多样性的植物适应策略....

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Published in	北京大学学报（自然科学版） Vol. 55; no. 2; pp. 387 - 396
Main Authors	马芳, 曾辉, 李洪波, 马泽清, 郭大立
Format	Journal Article
Language	Chinese
Published	北京大学深圳研究生院城市规划与设计学院,深圳,518055%中国科学院地理科学与资源研究所,北京,100101 20.03.2019
Subjects	多样性 diversity coexistence of species 生态策略 root functional traits 温带草原 temperate grassland 根功能属性物种共存 ecological strategy
Online Access	Get full text
ISSN	0479-8023
DOI	10.13209/j.0479-8023.2019.003

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Abstract	在内蒙古草原沿水分梯度选择 16 个样点, 测定 22 种优势植物根的形态和构型属性, 分析 6 种植物根属性(直径、根长、比根长、组织密度、分支强度和分支比)的变异及其对 4 种环境因子(年均降雨量、年均温、土壤含碳量和土壤含氮量)的响应规律.结果表明: 1) 不同物种间吸收根直径、组织密度和比根长的变异为 7, 9 和 15 倍, 根直径与侧根长度显著正相关, 与分支强度负相关; 2) 吸收根和非吸收根对降水和土壤氮的适应方式具有明显的种间效应, 当利用不同根系属性组合刻画植物适应策略时, 由于随着环境变化, 不同物种根属性产生变异的程度和方向各不相同, 从而形成多样性的植物适应策略.
AbstractList	在内蒙古草原沿水分梯度选择 16 个样点, 测定 22 种优势植物根的形态和构型属性, 分析 6 种植物根属性(直径、根长、比根长、组织密度、分支强度和分支比)的变异及其对 4 种环境因子(年均降雨量、年均温、土壤含碳量和土壤含氮量)的响应规律.结果表明: 1) 不同物种间吸收根直径、组织密度和比根长的变异为 7, 9 和 15 倍, 根直径与侧根长度显著正相关, 与分支强度负相关; 2) 吸收根和非吸收根对降水和土壤氮的适应方式具有明显的种间效应, 当利用不同根系属性组合刻画植物适应策略时, 由于随着环境变化, 不同物种根属性产生变异的程度和方向各不相同, 从而形成多样性的植物适应策略.
Abstract_FL	The authors measured root morphological and architectural traits of 22 different dominant plant species across 16 Inner Mongolia grassland sites along soil water gradients, and analyzed the response of these root traits (diameter, length, SRL, RTD, BrIntensity and BrRatio) to four environmental factors (MAT, MAP, Soil N and Soil C). The results showed that variation of absorptive root diameter, tissue density and specific root length among different species was 7, 9, and 15 times, respectively. There was a significant positive correlation between root diameter and lateral root length, but negative correlation between root diameter and root branching intensity. Responses of both absorptive and non-absorptive roots to precipitation and soil nitrogen were species-specific. When using different combinations of root traits to describe plant adaptation strategies, different species’ root traits respond to environmental changes with different degrees and direction of variation, resulting in a diversity of plant adaptation strategies.
Author	郭大立马芳马泽清曾辉李洪波
AuthorAffiliation	北京大学深圳研究生院城市规划与设计学院,深圳,518055%中国科学院地理科学与资源研究所,北京,100101
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Author_FL	ZENG Hui MA Zeqing LI Hongbo GUO Dali MA Fang
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