不同基质对闭鞘姜生长发育和光合作用的影响

采用随机区组设计,研究不同配比的红壤、泥炭、椰糠和珍珠岩6种基质配方对闭鞘姜生长的影响。测定6种基质的物理和化学性质,观测萌芽率、叶片数、茎粗、株高、株幅、光合日变化、根茎鲜重和根茎干重。结果显示,基质S4（泥炭+椰糠+珍珠岩=1∶2∶2）的植株净光合速率（P_n）显著高于其他基质处理。在6种基质生长的植株叶片净光合速率曲线呈单峰或双峰变化,而蒸腾速率曲线呈单峰变化。最大株高、最大根茎鲜重和根茎干重也出现在基质S4种植的植株。从以上结果可知,基质S4比较适合闭鞘姜的生长和根状茎干物质积累。

Effects of Different Substrates on the Growth and Development of Costus speciosus

In this study, the effects of six substrates consisting of red soil, peat, coir, and perlite in different proportions on the growth of Costus speciosus were investigated. The physical and chemical properties of the six substrates were measured after mixed. The sprouting rate, leaf number, stem diameter, plant height, plant width, diurnal variation of photosynthetic characteristics, rhizome fresh weight (RFW) and rhizome dry weight (RDW) were measured. The results revealed that the net photosynthetic rate (P_n) in the peat + coir + perlite, 1∶2∶2 (S4), was the greatest. The P_n curves of the six substrates varied in single or double peaks, while the transpiration rate (T_r) curves displayed a single peak. The greatest plant height, RFW and RDW were also observed in S4. Based on the findings, S4 was considered a suitable substrate for C. speciosus growth and dry matter accumulation.