摘要
利用Li-6400便携式光合测定仪,测定旱作条件下引种栽培的3份冰草材料光合日变化。结果表明,不同来源冰草净光合速率(Pn)日变化均为双峰型,第一峰值均出现在10∶00左右,第二峰值均出现在14∶00,在中午12∶00,3份材料都出现不同程度的"午休"现象,"午休"现象最明显的是来自山西的冰草,而当地冰草净光合速率日均值和最大值均高于其它两种材料;蒸腾速率(Tr)、气孔导度(Gs)、叶片水压亏缺(VPD)均为单峰曲线,峰值时间不一致,综合比较上述参数的日均值或最大值,表现为NMC3>HBC1>SXC2;3份材料叶绿素a和叶绿素b含量呈现出一致的变化趋势;对光合速率日变化影响较大的环境因子是PAR和Ca,生理因子是叶绿素b含量和VPD,对蒸腾速率日变化影响较大的环境因子是RH和Ca,生理因子是VPD和叶绿素a含量;地理来源较近的材料,引种栽培表现出较好的光合特性和较强的适应性。
Photosynthetic diurnal variations of three materials of A.cristatum was determined by Li-6400 portable photosynthesis analyzer under dry conditions, which had been introduced and cultivated. The results showed that the diurnal variations of photosynthetic rates presented double peak, and the first peak of the materials were in 10：00, and the second were in 14：00, and the phenomenon on ＂noon break＂ were obvious, and especially the material from Shanxi had evident ＂noon break＂ phenomenon, while the net photosynthetic rate of the local A.cristatum was higher than the mean and the maximum of the two other materials; the diurnal variations of transpiration rate, stomatal conductance and leaf water pressure deficit were single peak, and the peak time were not inconsistent, and the mean or maximum of these parameters expressed as NMC3 HBC1 SXC2 by comprehensive comparison; chlorophyll a and chlorophyll b among three materials showed consistent trend; PAR and Ca had the greater effect on the diurnal dynamics of Pn, and its physiological factors were chlorophyll b and VPD, while RH and Ca had the greater effect on the diurnal dynamics of Tr, and its physiological factors were VPD and chlorophyll a. The materials from similar eco-geographical situations, which had been introduced and cultivated, had better photosynthetic Characteristic and strong compatibility.
出处
《草业与畜牧》
2010年第7期10-15,共6页
Pruataculture & Animal Husbandry
基金
"973"计划项目"北方草地与农牧交错带生态系统维持与适应性管理的科学基础"(2007CB106806)
关键词
冰草
净光合速率
蒸腾速率
叶绿素
环境因子
Agrogyon cristatum
Net photosynthetic rate
Transpiration rate
Chlorophyll
Environmental factors
