摘要
设置3个土壤水分梯度,分别为对照组(CK)、轻度干旱处理组(HW)、重度干旱处理组(LW),测定牛膝菊(Galinsoga parviflora)的生长及光合特性。结果表明,1就株高、茎干重、根干重、叶生物量比和根生物量比而言,3个处理差异不显著(P>0.05);叶根比、比叶面积、叶面积比皆为HW最高。2随着光照度的增加,CK的牛膝菊净光合速率日变化呈现升高—降低—升高的趋势,HW和LW的牛膝菊净光合速率日变化呈现先升高后降低的趋势;光补偿点CK最高,为9.07μmol/(m2·s);光饱和点为HW最高,其数值为1 492.59μmol/(m2·s),LW最低,其数值为79.25μmol/(m2·s);LW的表观量子率最低;在最大光合有效辐射下,CK组的最大净光合速率最高,为13.96μmol/(m2·s)。3随着土壤水分的递减,牛膝菊净光合速率、气孔导度、蒸腾速率皆呈下降趋势,胞间CO2浓度变化为HW>CK>LW。
The growth and photosynthetic characteristics of Galinsoga parviflora were measured by setting the three soil water gradients, including contrast（CK）、mild drought group（HW） and severe drought group（LW）.The results showed that 1 On the plant height, stem weight,root weight, leaf mass ratio and root mass ratio,there was no significant difference among treatment groups（P〉0.05）;HW group was the largest with the leaf root ratio, specific leaf area and leaf area ratio. 2 With the increase of light intensity,the daily variation trend of G. parviflora of net photosynthetic rate for CK was rise-decline-rise,while for HW and LW first increased and then decreased. The light compensation point of CK was 9.07 μmol/cm^2·s,which was the highest of all. The light saturation point of HW with the highest was 1 492.59 μmol/（cm^2·s）,while LW was the lowest was 79.25 μmol/（cm^2·s）. The apparent quantum rate of the LW was the lowest. The maximum net photosynthetic rate of CK with the highest of all was 13.96 μmol/（cm^2·s） under the maximum photosynthetic active radiation. 3 With soil moisture content decreasing,the net photosynthetic rate,stomatal conductance and transpiration rate for G. parviflora showed a trend of decline. The change of intercellular CO2 concentration was HWCKLW.
出处
《湖北农业科学》
2015年第12期2910-2913,2926,共5页
Hubei Agricultural Sciences
基金
国家自然科学基金资助项目(31070466)
