Abstract: When a new plant species is introduced to a new district, its disturbance could alter the structure of original ecosystem, resulting in the formation  of a distinctive self-organized ecosystem to develop the maximizing empower under the new situation. In this paper, an emergy analysis method was made on the two ecosystems Spartina alterniflora salt marsh and mudflat in North Jiangsu. Compared  with the mudflat, S. alterniflora ecosystem had a 1.52E+18 sej higher annual total emergy output, 4.72 times of emergy density, and about 5 times of  base emergy yield ratio. S. alterniflora ecosystem could use the energy more efficiently to increase its emergy storage and to realize it self’s empower maximizing. After invading into a tidal flat ecosystem,  S. alterniflora via self organization could promote the ecosystem to achieve empower maximizing, and to full play its ecological services. However, too fast propagation and  spread could induce a series of negative effects, such as inhibiting native plants, trenching on sea-route, and endangering the seashells breeding, etc.

Key words: Spartina alterniflora, emergy analysis, ecological service, empower maximizing, tomato, sub-low temperature, drought, photosynthetic characteristics, distribution of energy and electron flow.