盐度变化条件下芦苇对互花米草的化感效应  

Allelopathy of Phragmites australis on Spartina alterniflora under different salinity

作　　者：郑琨[1] 赵福庚[1] 张茜[1] 钦佩[1] 

机构地区：[1]南京大学生命科学学院,南京210093

出　　处：《应用生态学报》2009年第8期1863-1867,共5页Chinese Journal of Applied Ecology

基　　金："十一五"国家科技支撑计划项目(2006BAD03A19);国家"908"计划项目(JS-908-02-07)资助

摘　　要：以芦苇凋落物为试材,采用溶液浸提法和厌氧腐解法,获得水提物和腐解产物两种浸提物母液;在5‰和10‰盐浓度下以两种浸提物母液和25%母液分别处理互花米草种子、刚萌发的幼苗以及互花米草滩涂中特有的互花米草益生菌,考察盐度变化对互花米草种子的萌发、幼苗生长以及菌落生长的影响.结果表明:盐处理能够显著促进互花米草种子的萌发、幼根以及互花米草益生菌的生长(P<0.05).较高的盐浓度(10‰)下,芦苇水提物对互花米草的萌发、生长和互花米草益生菌的生长呈促进作用;当盐浓度降低至5‰时,该促进作用消失.在较低的盐浓度(5‰)下,芦苇腐解产物对互花米草萌发产生显著的抑制作用;在较高盐浓度(10‰)时,则对互花米草益生菌产生显著促进作用(P<0.05);在试验的任一盐浓度下,芦苇腐解产物对互花米草幼苗和幼根的生长均存在显著的抑制效果(P<0.05).Using Phragmites australis litter as test material, two kinds of its mother liquid, i. e. , water extract and decomposed products, were obtained by the methods of solution extraction and anaerobic decomposition. The two liquids with concentration 100% and 25% were used to treat the seeds and seedlings of Spartina alterniflora and the endemic beneficial fungi （Mortierella sp. ） of S. alterniflora under 5‰ and 10‰ salinity, aimed to study the effects of different salinity on the germination and growth of S. alterniflora and the growth of the fungi. Salt stress promoted the seed germination and young root growth of Spartina alterniflora as well as the growth of MortiereUa sp. significantly （P 〈 0.05 ）. The water extracts promoted the germination and growth of Spartina alterniflora and the growth of MortiereUa sp. when the salinity was 10‰, but the promotion effect disappeared when the salinity was reduced to 5‰. The decomposed products of Phragmites australis restrained the germination of Spartina alterniflora significantly （P 〈 0. 05 ） when the salinity was 5%v, but prorooted the growth of Mortierella sp. significantly （P 〈0.05 ） when the salinity was 10‰. Under the two salinities, the decomposed products restrained the growth of Spartina alterniflora seedlings and young roots significantly （P 〈 0. 05）.

关 键 词：互花米草 芦苇 化感效应 盐浓度 互花米草益生菌 

分 类 号：S451[农业科学—植物保护]