Abstract:   In this paper,2­year old Chilopsis linearis introduced from western USA was pot­cu ltured under different soil moisture regime,and its growth and biomass allocation were studied.The results showed that soil water stress severely restricted the vegetative and reproductive growth of C.linearis,and induced a remarkable decrease of its individual leaf number,branch number,lateral root number,and total biomass. Compared with light water stress,medium and heavy water stress decreased the individual dry biomass of C.linearis by 40.9% and 76.4%,respectively.Under heavy soil water stress,the single leaf dry biomass,single leaf area,and the ratio of single leaf dry biomass to single leaf area decreased by 63.45%,47.39% and 27.23%,while the ratio of leaf surface area to its fresh biomass and that of root to stem increased by 22.28% and 86%,respectively,compared to light water stress.With aggravating soil water stress,there was a trend that photosynthetic matter accumulated mainly in middle and top leaves of stem,and the decrement of component biomass was in order of leaf>stem>main root>lateral root,which reflected the whole plant action to soil water stress.

Key words: Kandelia candel, Bruguiera gymnorrhiza, Mangrove, Livestock wastewater, Salinity