干旱对侧柏容器苗和裸根苗生长、营养及生理特性的影响  

Effects of drought stress on growth,nutrition and physiological characteristics of Platycladus orientalis container and bareroot seedlings

作　　者：刘方春[1] 邢尚军[1] 马海林[1] 杜振宇[1] 马丙尧[1] 

机构地区：[1]山东省林业科学研究院,山东省森林植被生态修复工程技术研究中心

出　　处：《北京林业大学学报》2014年第5期68-73,共6页Journal of Beijing Forestry University

基　　金：山东省科学技术发展计划项目(2010GSF10621)

摘　　要：以侧柏为供试植物,通过盆栽试验研究了不同强度干旱(对照、轻度干旱、中度干旱和重度干旱)对容器苗和裸根苗生长、营养及生理特性的影响。结果表明:随着干旱胁迫强度的增加,侧柏抗氧化酶活性(POD和SOD)、渗透调节物质(脯氨酸和可溶性糖)和膜脂过氧化产物(MDA)的积累逐渐增加。干旱胁迫下,同侧柏裸根苗相比,容器苗显著提高了抗氧化酶活性,减少了渗透调节物质和膜脂过氧化产物的积累。干旱胁迫程度较轻时,侧柏容器苗和裸根苗的相对含水量和相对电导率差异不显著。而在重度干旱时,同正常浇水处理相比,侧柏容器苗和裸根苗的相对含水量分别下降了10.43%和18.36%,相对电导率分别提高了28.87%和43.49%,容器苗的变化幅度显著小于裸根苗。干旱胁迫下,侧柏容器苗较裸根苗具有较高的干物质积累量,且干旱胁迫强度越大,容器苗干物质积累量的增加幅度越大。干旱胁迫对侧柏地上部养分及地下部氮和磷的含量影响较小,但显著提高了地下部钾的含量。无论处于何种水分状态,容器苗的养分总积累量显著大于裸根苗,且随着干旱胁迫强度的增加,养分总积累量的差异逐渐增大。综合分析认为,同侧柏裸根苗相比,干旱生境下,侧柏容器苗具有较强的保护酶调节能力,可减少膜脂过氧化产物的积累,促进干物质积累和养分的吸收,具有更强的抵御干旱损伤的能力。Taking Platycladus orientalis as study materials, this paper investigates how different treatments of drought stress （light, moderate, severe and control） impact the growth, nutrition and physiological characteristics of container and bareroot seedlings by applying the pot method. Results showed that antioxidant enzyme activity, osmotic adjustment substance, and lipid peroxidation products were becoming higher along with drought stress. Under drought stress conditions, antioxidant enzyme activities of container seedlings were significantly higher than those of bareroot ones. However, osmotic adjustment substance and lipid peroxidation products in bareroot seedlings were higher than those in container ones. No significant difference was observed between container and bareroot seedlings under light drought stress. Compared with the irrigated control, the relative water content of P. orientalis container seedlings decreased by 10.43% , as well as that of bareroot ones decreased by 18.36%. However, the relative electric conductance of container and bareroot seedlings increased by 28.87% and 43.49%, respectively, indicative of less change of container seedlings than that of the bareroot ones. Compared with P. orientalis bareroot seedlings, container seedlings had hi Additionally, an increasing effect of container seedlings on dry matter with the increasing drought intensity. Although no significant effect of gher dry matter accumulation was drought stress on accumulation. obtained along shoot nutritioncontents was observed, potassium content of root was significantly increased. Whatever the water conditions, nutrition accumulations of P. orientalis container seedlings were significantly higher than those of bareroot ones. Additionally, an increasing difference between container and bareroot seedlings was observed along with the increasing drought intensity. As a result, container seedlings had higher regulating capacity of antioxidant enzyme, and could reduce the accumulation of lipid peroxidation products in comp

关 键 词：侧柏 容器苗 裸根苗 干旱胁迫 

分 类 号：S718.43[农业科学—林学]