关键词: 分维, 分维, 集水面积阈值, 长江

Abstract:

To provide the reference for choosing reasonable cultural measurement, the effects of different light intensity on the photosynthetic characteristics of Lycoris aurea in Lycoris Herb were studied in the paper. The samples of Lycoris aureas were planted in three different envioroments, including full natural light, 50% shade and 85% shade. The main parameters of the samples were analyzed, including maximum net photosynthetic rate (Pmax), light saturation point(LSP), light compensation point (LCP), and light use efficiency (LUE) by LI-6400. Chlorophyll (Chl) contents, specific leaf weight (SLW) and leaf area were determined. Comparing with the full natural light treatment, LSP and LCP of the plants in 50% shade and 85 % shade treatment were both lower, and the latter significantly lower (P<0.05), but higher Chl content (chlorophyll b significantly higher) (P<0.05). These results indicated that Lycoris aureas effectively used weak light by decreasing LCP and relative chlorophyll b content. Pmax and LUE [PAR>300 μmol/(m2?s)] of the plants in 50% shade treatment were higher than the other’s, and significantly higher than the latter (P<0.05). SLW in 50 % shade treatment was the highest of them, and there was significant difference comparing with the 85% shade treatment (P<0.05). The leaf area in 85% shade treatment was the highest of them, and there was significant difference comparing with the full natural light treatment (P<0.05). The results suggested that the appropriate shade treatment enhanced the net photosynthetic rate (Pn), LUE and SLW of Lycoris aurea in Lycoris Herb, in the high light intensity seasons, which was advantaged to develop.