菌根接种与氮肥处理下木荷抗旱能力差异分析  

Analysis of Differences in Drought Resistance of Schima superba UnderMycorrhizal Inoculation and Nitrogen Fertilizer Treatment

作　　者：吴有勤 Wu Youqin(Qingyuan Bijia Mountain Forest Farm,Qingyuan 511800,China)

机构地区：[1]清远市笔架山林场,广东清远511800

出　　处：《防护林科技》2024年第3期28-32,59,共6页Protection Forest Science and Technology

摘　　要：为实现木荷科学营林,提升木荷抗旱性,利用菌根接种与施氮方法,探究干旱胁迫下木荷幼苗生长生理方面的变化。结果表明:与正常75%土壤含水量相比,在40%土壤含水量条件下,苗木遭受明显的干旱胁迫,苗高(H)、地径(D)增量显著下降,叶片叶绿素含量(CP)、净光合速率(P_(n))、水分利用效率(WUE)、胞间二氧化碳浓度(C_(i))减小,蒸腾速率(T_(r))、气孔导度(G_(s))增大,相对水分亏缺率(RWD)、丙二醛(MDA)增加,SOD活性及可溶性糖(SS)、游离脯氨酸(Pro)含量降低。与单一性菌根接种、施氮处理相比,菌根+施氮复合性处理下苗木高径生长量最大,P_(n)、WUE最高。单一性菌根接种、施氮效果受到土壤含水率影响,其中正常水分条件下施氮处理苗木的高径增量及CP、P_(n)大于菌根处理,而在干旱胁迫下菌根处理苗木的CP、T_(r)、G_(s)、RWD低于施氮处理,C_(i)、SOD活性及SS、Pro含量高于施氮处理。以本试验检测的13个生长生理指标为评价指数进行苗木生长生理表现综合评价,得分表现为:任一土壤水分条件下复合性菌根+施氮处理>单一性菌根或施氮处理,正常水分条件下施氮处理>菌根处理,干旱条件下菌根处理>施氮处理。研究认为,利用菌根接种与施氮交互处理能有效改善木荷幼苗的抗旱性。To achieve scientific afforestation of Schima superba and improve its drought resistance,mycorrhizal inoculation and nitrogen application methods were used to explore the physiological changes in the growth of Schima superba seedlings under drought stress.The results showed as follows:compared with the normal 75%soil moisture content,under the condition of 40%soil moisture content,seedlings suffered from significant drought stress,with a significant decrease in seedling height(H)and ground diameter(D)increment,a increase in leaf chlorophyll content(CP),net photosynthetic rate(P_(n)),water use efficiency(WUE),intercellular carbon dioxide concentration(C_(i)),an increase in transpiration rate(T_(r))and stomatal conductance(G_(s));and a relative water deficit rate(RWD)malondialdehyde(MDA)increased,SOD activity and soluble sugar(SS)and free proline(Pro)content decreased.Compared with single mycorrhizal inoculation and nitrogen application treatment,the composite treatment of mycorrhizal inoculation and nitrogen application resulted in the highest height diameter growth of seedlings,as well as the highest P_(n) and WUE.The effect of single mycorrhizal inoculation and nitrogen application was affected by soil moisture content,under normal water conditions,the height diameter increment,CP,and P_(n) of nitrogen treated seedlings were greater than those of mycorrhizal treatment.However,under drought stress,the CP,T_(r),G_(s),and RWD of mycorrhizal treated seedlings were lower than those of nitrogen treatment,and the activities of C_(i) and SOD,and the contents of SS and Pro were higher than those of nitrogen treatment.The 13 growth physiological indicators detected in this experiment were used as evaluation indices to comprehensively evaluate the physiological performance of seedling growth.The scores reflected as follows:composite mycorrhizal fungi+nitrogen application treatment under any soil moisture condition>single mycorrhizal fungi or nitrogen application treatment;under normal water conditions,nitrogen application

关 键 词：木荷 抗旱性 丛枝菌根 氮素 生长生理 

分 类 号：S723.7[农业科学—林木遗传育种]