Abstract: According to the concentrations of nitrogen and phosphorus of the water in Gonghu Lake (ranging from 0.4 to 4 mg·L^-1, 0.04 to 0.4 mg·L^-1, respectively), a controlled experiment using Vallisneria spinulosa and V. denseserrulata was conducted to investigate their growth, physiological traits and the differences between the cogenus plants in response to different water nutrient levels. The results showed that the nutrient levels had no significant effects on the final biomass of the two plants, whereas the maximum height of V. spinulosa in treatments increased by 19% (P<0.05), 63% (P<0.05) and 205% (P<0.01), and the maximum height of V. denseserrulata in the highnutrient treatment was significantly higher than in the lownutrient treatment (P<0.05). The clonal propagation abilities of V. spinulosa and V. denseserrulata were significantly decreased by 30% and 20% in highnutrient water, respectively. V. spinulosa and V. denseserrulata suffered from nutrient stresses in lownutrient water, as demonstrated by the increase in the MDA content (P<0.05) and the decrease in the chlorophyll content (P<0.05). These two species had wide adaptation to the concentrations of total nitrogen and total phosphorus ranging from 1.5 to 4 mg·L^-1 and 0.15 to 0.4 mg·L^-1, respectively.

Key words: regionalization, green development, Jiangxi Province, index system.