下层土壤容重对玉米生育后期光合特性和产量的影响  

Effects of subsoil bulk density on late growth stage photosynthetic characteristics and grain yield of maize (Zea mays L.).

作　　者：王群[1] 李潮海[1] 郝四平[1] 张永恩[1] 韩锦峰[1] 

机构地区：[1]河南农业大学农学院河南省作物生长发育调控重点实验室,郑州450002

出　　处：《应用生态学报》2008年第4期787-793,共7页Chinese Journal of Applied Ecology

基　　金：河南省重大科技攻关资助项目(0522010200)

摘　　要：在耕层（0～20cm）土壤容重不变情况下，采用池栽方法研究了下层（20～40cm，40～60cm）土壤容重变化对玉米生育后期光合特性和产量的影响．结果表明：当下层土壤容重不同时，玉米的光合速率（Pn）和产量都存在显著差异，随着下层土壤容重的增加，叶片Pn和产量降低，下层土壤容重越大，降幅越大．不同处理玉米叶片的Pn和细胞间隙CO2浓度（Ci）的变化趋势不同，Pn早晨和傍晚较低，中午较高，且随着下层土壤容重的增加而降低，Ci的变化趋势则相反．气孔限制值（Ls）和气孔导度（Gs）也随着下层土壤容重的增加而降低．随着玉米生育进程，Pn、Ls和Gs不断下降，而Ci不断升高．A pool-culture experiment was conducted to study the effects of different subsoil bulk density at the depths of 20-40 and 40-60 cm on the late growth stage photosynthetic characteristics and grain yield of maize. The results showed that there existed significant differences in the net photosynthetic rate （Pn） and grain yield when the subsoil bulk density was differed. The Pn and grain yield decreased with increasing subsoil bulk density, and the higher the bulk density, the more significant the decrement in Pn and grain yield. The diurnal centration （ Ci ） were not in the same trend. Pn was high decreased with increasing subsoil bulk density; while C （ Ls） and stomatal conductance （ Gs ） also decreased with changes of Pn and intercellular CO2 conat noon and low at twilight and dusk, and was in adverse. The stomatal limitation increasing subsoil bulk density. With the development of maize, the Pn, Ls and Gs decreased gradually, while Ci increased continuously.

关 键 词：土壤容重 玉米 光合特性 产量 

分 类 号：S513[农业科学—作物学]