干旱胁迫下外源钙对矿区玉米生长的影响  

Influence of exogenous calcium on the growth of maize under arid-stress in mine area

作　　者：李少朋[1] 毕银丽[1] 陈昢圳[2] 刘生[1] 张姣[1] 周建[1] 高菲[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国农业大学资源与环境学院,北京100193

出　　处：《中国矿业大学学报》2013年第3期477-482,共6页Journal of China University of Mining & Technology

基　　金：高等学校博士学科点专项科研项目(20090023110009);十二五科技支撑计划项目(2012BAC10B03)

摘　　要：通过盆栽模拟试验,以玉米为供试植物,矿区退化土壤为供试基质,对盆栽玉米分别施加不同浓度的CaCl2(5,10,20,40,80mmol/L),研究了干旱胁迫下外源钙对矿区玉米生长和养分吸收的影响.结果表明:对矿区退化土壤上生长的玉米施加适当含量的外源钙,可显著提高玉米对养分的吸收,有利于玉米的生长.当施入CaCl2浓度小于20mmol/L时,玉米氮磷钾累积量随外源钙含量的增加而增加,且用浓度为20mmol/L的CaCl2处理显著提高了苗期玉米的生物量、叶片相对含水量和叶片叶色值(SPAD),玉米地上部分和根系部分氮磷钾累积量与其它处理差异性显著;当施入CaCl2浓度大于40mmol/L时,玉米氮磷钾累积量随着外源钙含量增加而降低;用浓度为80mmol/L的CaCl2处理抑制了玉米的生长,高含量的钙破坏了玉米离子动态平衡,对苗期玉米生长产生危害.Experiment was simulated which maize was planted in degraded potting soil,setting treatments of CaCl2 applied at five levels（5,10,20,40,80 mmol/L）,to investigate the effects of exogenous calcium on maize growth and nutrition uptake in mine area under arid-stress.The results show that fertilizing proper exogenous calcium concentration can significantly improve nutrient absorption,and be beneficial to maize growth in degraded soil of mine area.When the concentration of CaCl2 fertilized is less than 20 mmol/L,cumulated amounts of nitrogen,phosphorus and potassium in maize increase with an increase of exogenous calcium levels.Using CaCl2 with 20 mmol/L can significantly improve the biomass,relative water content and SPAD of the maize seedling;N and P cumulated amounts in aerial parts and root parts of maize have significantly differences compared with other treatments.When the concentration of CaCl2 fertilized is equal or greater than 40 mmol/L,the concentrations of N and P decrease with the rising of exogenous calcium levels.However,higher exogenous calcium concentration damages the maize ion dynamic equilibrium,and causes harm to the growth of maize seeding when fertilizing CaCl2 with 80 mmol/L.

关 键 词：外源钙 干旱胁迫 煤矿区 玉米 

分 类 号：Q89[生物学]