盐度变化条件下芦苇对互花米草的化感效应

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).

Allelopathy of Phragmites australis on Spartina alterniflora under different salinity

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 Mortierella sp. significantly (P＜005). The water extracts promoted the germination and growth of Spartina alterniflora and the growth of Mortierella 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‰;but promoted 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).