Effects of temperature, light intensity and ratio of nitrogen to phosphorus on growth of seedlings in sea weed Sargassum horneri
WANG Limei, WANG Shuyang, XU Weiding, LI Hualin, HE Ping*
Dalian Key Laboratory of Conservation Biology for Endangered Marine Mammals, Liaoning Key Laboratory of Marine Biological Resources and Ecology, Liaoning Ocean and Fisheries Science Research Institute, Dalian
Abstract: Juvenile sea weed Sargassumhorneri of some 5 cm and 2 cm long side branches with blades of 10-13 and 6-8, respectively, were cultured in an incubator at temperatures of 10, 15, 20 ℃, and 25 ℃, light intensity of 4500 lx, 8900 lx, and 11 000 lx and ratios of nitrogen to phosphorus (NH4NO3∶Na2HPO4=5∶1, 8∶1, 10∶1, and 16∶1) for 20 days to investigate effects of temperature, light intensity and ratio of nitrogen to phosphorus on growth of the sea weed seedlings and to search for optimization of the culture conditions of sea weed seedlings. The results showed that there was significant effect of water temperature on specific growth rate (SGR) in body length and body weight of 5 cm long seedlings and SGR in body length of 2 cm long seedlings in 10 and 20 day culture (P<0.01), with the maximal SGR in 5 cm and 2 cm long seedlings, and significant higher SGR in 2 cm long seedlings than that in seedlings in other groups (P<0.50). There was very significant effect of only light intensity on SGR in body weight of 2 cm long seedlings (P<0.01), with significant higher SGR at lower light intensity (4500 lx) than that in higher light intensity (11 000 lx) (P<0.50). It was found that there was no significant effect of ratio of nitrogen to phosphorus on the seedling growth (P>0.05). The findings indicated that the best growth was observed under the conditions of water temperature of 20 ℃ (15-25 ℃), light intensity from 8900 lx to 11 000 lx, and low density of 2 cm seedlings, which provides basic data for seedlings culture of sea weed Sargassumhorneri.
王丽梅, 王舒扬, 许伟定, 李华琳, 何平. 温度、光强及氮磷比对断枝铜藻幼苗生长的影响[J]. 大连海洋大学学报, 2020, 35(3): 376-381.
WANG Limei, WANG Shuyang, XU Weiding, LI Hualin, HE Ping. Effects of temperature, light intensity and ratio of nitrogen to phosphorus on growth of seedlings in sea weed Sargassum horneri. Journal of Dalian Ocean University, 2020, 35(3): 376-381.