栽培密度对薄荷生长策略和光合特性的影响

李涛1,2, 刘玉军2, 白红彤1, 石雷1, 姜闯道1,*
1中国科学院植物研究所, 北京100093; 2北京林业大学生物科学与技术学院, 北京100083

通信作者:姜闯道;E-mail: jcdao@ibcas.ac.cn;Tel: 010-62836657

摘 要:

比较研究了不同栽培密度对薄荷生长策略及光合特性的影响。结果表明: (1)随着密度的升高, 单株的株高、茎粗、 分枝数、单叶面积、叶片厚度等下降; (2)提高栽培密度时, 薄荷的光合色素含量、光合面积、净光合速率均降低, 而PSII 的最大光化学效率不变; (3)高密度下, 单株的根、茎、叶及总生物量积累下降, 而群体的生物量积累变化不明显, 但地下部 分的生物量分配比例均显著增加。进一步分析表明密植会通过降低薄荷单位面积的色素含量而导致光合速率下降; 栽培 密度提高时薄荷通过增加根生物量比来优先竞争矿质营养。

关键词:薄荷; 栽培密度; 光合速率; 生物量

收稿:2012-05-24   修定:2012-06-08

资助:中国科学院知识创新方向性项目(KSCX2-EW-B-9)、北京 市自然科学基金(6122025)、中国科学院西部行动计划项目 (KZCX2-XB3-07-02)和新疆生产建设兵团科技支新计划项 目(2008ZJ04)。

Effects of Planting Density on Growth Strategies and Photosynthetic Characteristics of Mentha haplocalyx Briq.

LI Tao1,2, LIU Yu-Jun2, BAI Hong-Tong1, SHI Lei1, JIANG Chuang-Dao1,*
1Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 2College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing 100083, China

Corresponding author: JIANG Chuang-Dao; E-mail: jcdao@ibcas.ac.cn; Tel: 010-62836657

Abstract:

The main objectives of this study were to analyze the effects of planting density on growth strategies and photosynthetic characteristics of M. haplocalyx Briq. The results showed that: (1) the height, stem diameter, branch number, single leaf area and leaf thickness decreased with the increase in planting density. (2) The increase of planting density induced the decrease of chlorophyll content and net photosynthetic rate (Pn), while the maximum quantum yield of photosystem II (Fv/Fm) was unchanged. (3) The biomass of root, stem and leaf as well as the total biomass of single plant decreased strikingly and the biomass of population kept constant with the increase in planting density, but biomass allocation of single plant and population was similar. Consequently, we thought that high planting density could depress photosynthetic capacity by affecting chlorophyll content in this study; the M. haplocalyx Briq could compete for mineral nutrients preferential by enhancing the root mass ratio with the increase of planting density.

Key words: Mentha haplocalyx Briq.; planting density; photosynthetic rate; biomass

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