摘要
本研究在开顶式气候室,研究了CO_2加富和常规含量下(1 000和380μmol/mol)以及不同钾素水平(150、300、600 mg/kg)下,黄瓜各生育期叶片的净光合速率、气孔导度、蒸腾速率等的变化及其相互关系。结果表明:(1)CO_2加富短期内(1~24 d)极显著提高了黄瓜光合作用,而加富后期(27 d)所有钾素水平的黄瓜均出现了光合下调/适应现象,其中150 mg/kg和300 mg/kg钾素水平的黄瓜叶片光合速率较大;(2)过高钾素(600 mg/kg)会抑制苗期(加富2 d)黄瓜光合作用,CO_2加富后期(27 d)则无显著影响,且增加钾素供应对缓解光合适应无影响;(3)CO_2加富前期,黄瓜气孔导度、蒸腾速率显著降低,水分利用效率提高,后期常规钾素水平(150 mg/kg)黄瓜气孔导度、蒸腾速率有增加的趋势;加富前期光合速率与气孔导度呈显著正相关,后期则无显著相关关系;(4)CO_2加富显著增加了黄瓜植株干重,高CO_2含量条件下增加钾素水平可继续增加生物量,但在自然CO_2含量下增加钾素水平黄瓜生物量则无显著变化。
The study in open top chamber was conducted to explore the changes of cucumber leaf net photosythetic rate, stomatal conductance, transpiration rate and its relationship to each other under different CO2 concentrations （ 1 000 and 380μ mol/mol） and K levels （ 150, 300, 600 mg/kg）. Re- suits showed that： （1） Early CO2 enrichment （1 to 24 days） significantly increased the cucumber photosynthesis, later （27 days） a down-regulation occurred on all K levels, of which 150 mg/kg and 300 mg/kg K levels showed a slightly larger photosynthetic rate. （2） High K levels （600 mg/kg） could suppress photosynthesis in the seedling stage （2 days） of cucumber plants, this inhibitory effect was eliminated after 27 days treatment of enriched CO2, increasing K fertilizer found no signs that can alleviate photosynthetic adaptation on this study. （3） Early CO2 enrichment significantly reduced stom-atal conductance, transpiration rate and promote water use efficiency, the late the two photosynthetic parametres of cucumber under general K level （ 150 mg/kg） increased. In early CO2 enrichment, pho- tosynthetic rate was significantly positively related to stomatal conductance, whereas there was no sig- nificant correlation the late. （4） Enriched CO2 concentration increased the dry weight of cucumber plant, and its biomass increase with higher K levels, while cucumber biomass between different K lev- els grown under ambient CO2 concentration showed no significant difference.
出处
《云南农业大学学报（自然科学版）》
CSCD
北大核心
2017年第1期57-62,共6页
Journal of Yunnan Agricultural University:Natural Science
基金
国家自然科学基金项目(31360499)
关键词
CO2加富
钾素水平
黄瓜
光合适应
enriched CO2
K levels
cucumber
photosythetic acclimation
