| 刘祖贵,陈金平,段爱旺,孟兆江,张寄阳,刘战东.不同土壤水分处理对夏玉米叶片光合等生理特性的影响[J].干旱地区农业研究,2006,(1):90~95 |
| 不同土壤水分处理对夏玉米叶片光合等生理特性的影响 |
| Effects of different soil moisture treatments on physiological characteristics of summer maize leaves |
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| DOI：10.7606/j.issn.1000-7601.2006.01.20 |
| 中文关键词: 夏玉米 土壤水分 生理特性 水分利用效率 |
| 英文关键词:summer maize soil moisture physiological characteristics water use efficiency |
| 基金项目:“863”重大专项(2002AA2Z4071)资助 |
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| 中文摘要: |
| 通过对防雨棚下测坑中种植的夏玉米设置不同的土壤水分控制下限指标试验,研究了土壤水分状况对夏玉米生理特性及水分利用效率的影响。结果表明,各生理指标有着明显的日变化特征,不同处理气孔导度(Gs)峰值出现的时间早于光合速率(Pn)和蒸腾速率(Tr),在高水分条件下(T-80,土壤水分控制下限占田间持水量的80%,下同)Tr峰值出现的时间滞后于Pn,而T-60处理、T-50处理的Tr峰值出现的时间早于Pn,随着土壤水分胁迫程度的增加,Gs、Tr、Pn的峰值有提前出现的趋势;不同处理细胞液浓度(CSC)的峰值及叶水势(LWP)的低谷均在14∶00左右出现。Pn、Tr、Gs和LWP随土壤含水量的增加而增加,而CSC则下降。叶片水分利用效率LWUE(Pn/Tr)随光合有效辐射(PAR)的增加而增大,其峰值在10∶00左右出现,T-70处理的LWUE最高,T-50处理的最低。此外,通过对各处理的产量和产量水平水分利用效率(WUE)的分析得出,夏玉米节水高产的适宜土壤水分控制下限指标为田间持水量的70%。 |
| 英文摘要: |
| By imposing different lower limits of soil moisture on summer maize(Zea mays L.)grown in non-weighting lysimeters under a rain shelter,the effects of soil water status on physiological characteristics and water use efficiency of summer maize were studied.The results showed that all the physiological parameters had obviously diurnal change characteristics;the time when the maximum of stomatal conductance(Gs) appeared was earlier than that of photosynthetic rate(Pn) and transpiration rate(Tr). Under high soil water condition(T-80),the time when the peak value of Tr emerged was later than that of Pn, but the time when the peak value of Tr in both T-60 and T-50 treatments emerged was earlier than that of Pn.The maximum of Gs,Tr and Pn appeared to become earlier with soil moisture decreasing,and the peak values of leaf water potential(LWP) and cell sap concentration(CSC) were all appeared at about 14∶00 pm. Gs,Tr,Pn and LWP increased with the improvement of soil water,but the CSC declined.Leaf water use efficiency(LWUE) increased with the augmentation of photosynthetic active radiation(PAR) and reached the maximum at about 10∶00 am.The LWUE of T-70 treatment was the highest and that of T-50 was the smallest.In addition,according to the results of yield and water use efficiency in different treatments,the proper lower limit of soil moisture for water-saving and high-yield in summer maize was 70% of field water capacity. |
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