科尔沁沙地典型草地植物功能性状及其相互关系

doi:10.13866/j.azr.2018.01.17

摘要/Abstract

摘要： 以科尔沁沙地长期封育草地的19种植物为对象,分别测定植物高度(Height)、比叶面积(SLA)、叶片干物质含量(LDMC)、碳含量(LNC)、氮含量(LNN)5个植物功能性状,比较不同生活型(一二年生植物、多年生植物)和功能型(C₃植物、C₄植物)植物功能性状的差异性,探讨沙地内典型草地不同植物功能性状的内在联系及其对环境的适应性。结果表明:多年生植物的LDMC极显著大于一二年生植物,且C₃植物的高度显著大于C₄植物;对于一二年生植物而言,C₃植物的LNC显著大于C₄植物;对于C₄植物而言,多年生植物的LDMC和LNC显著大于一二年生植物。植物功能性状相关分析表明,SLA与LDMC极显著负相关,LNC与LNN极显著正相关。科尔沁沙地长期封育草地植物不同生活型、功能型的功能性状存在明显差异,多年生C₄植物具有较强的生态适应能力。

关键词: 草地植物, 功能性状, 生活型, 光合途径, 科尔沁沙地

Abstract: In this study,five functional traits including the height,specific leaf area (SLA),leaf dry matter content (LDMC),leaf carbon content (LNC) and leaf nitrogen content (LNN) of 19 dominant plant species on the Horqin sandy land under enclosure were measured.The functional traits differed in two life forms (annual/biennial plants and perennial plants) and two photosynthetic pathways (C₃ plants and C₄ plants).The discrepancies in functional traits between different life forms and photosynthetic pathways were compared and analyzed.Furthermore,the interrelations of functional traits and the adaptabilities of the plant species to the environment in the typical grassland were discussed.The results showed that the LDMC of perennial plants was significantly higher than that of annual/biennial plants.Regarding to the perennial plants,the height of C₃ plants was significantly higher than that of the C₄ plants.For the annual/biennial plants,the LNC of C₃ plants was significantly higher than that of the C₄ plants.Relative to the C₄ plants,the LDMC and LNC of the perennial plants were significantly higher than those of the annual/biennial plants.Correlation analyses showed that there was an extremely significant negative correlation between SLA and LDMC,but an extremely significant positive one between LNC and LNN.Based on the results above,following conclusions were obtained: there were the obvious discrepancies in the plant functional traits between the different life forms and the different photosynthetic pathways in the enclosure grassland ecosystem.The adaptability of perennial C₄ plants to drought environment was strong.

Key words: grassland plant, functional trait, life form, photosynthetic pathway, Horqin sandy land

张晶, 左小安, 吕朋, 岳喜元, 张婧. 科尔沁沙地典型草地植物功能性状及其相互关系[J]. 干旱区研究, 2018, 35(1): 137-143.

ZHANG Jing, ZUO Xiao-an, LV Peng, YUE Xi-yuan, ZHANG Jing. Functional Traits and Interrelations of Dominant Plant Species on Typical Grassland in the Horqin Sandy Land,China[J]. Arid Zone Research, 2018, 35(1): 137-143.

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