不同遮荫、土壤排水处理对毛棉杜鹃幼苗生长及光合特性的影响

doi:10.11707/j.1001-7488.20170206

摘要/Abstract

摘要： [目的] 筛选出毛棉杜鹃适宜的关键栽培条件，以便为其园林应用提供技术支持。[方法] 采用裂区试验设计，以不同遮荫（0%、30%、50%、80%）处理为主区，不同土壤排水性（高垄、平床）处理为副区，测定毛棉杜鹃生长、叶绿素、光合特性日变化及光响应曲线的变化。[结果] 在遮荫50%、高垄处理下，毛棉杜鹃枝条生长量最大，chlt（总叶绿素含量）、P_max（最大净光合速率）、AQY（表观量子效率）、P_n（净光合速率）日平均值、WUE（水分利用率）日平均值、P_n/PAR（光能利用率）日平均值最高或较高，chla/chlb、LCP（光补偿点）、LSP（光饱和点）、R_d（暗呼吸速率）最低或较低；全光照、平床处理下，毛棉杜鹃基茎生长量、chla/chlb、LCP、LSP、R_d最大或较大，叶绿素含量、P_max、AQY、P_n日平均值、WUE日平均值、P_n/PAR日平均值最低或较低。总体上，随着遮荫水平（在适度遮荫范围内）的提高和土壤排水性的改善，枝条生长量、叶绿素含量、P_max、AQY、P_n日平均值、WUE日平均值、P_n/PAR日平均值呈逐渐增加的趋势，其他各项生理指标呈逐渐减少的趋势。[结论] 毛棉杜鹃幼苗适宜在遮荫50%、高垄处理的条件下生长。

关键词: 毛棉杜鹃, 遮荫, 排水, 枝条生长, 净光合速率, 光响应曲线, 光能利用率, 水分利用率

Abstract: [Objective] This study aimed to select the suitable key cultivation conditions for growth of Rhododendron moulmainense and provide technical support for landscape application of R. moulmainense.[Method] The split-plot experiment design was adopted with different shading (0%,20%,50%,80%) as the main plot and different soil water drainage (high bed and flat bed) as the subplot. The plant increment and photosynthetic characteristics of R. moulmainense. were measured.[Result] The results showed that under 50% shading with high bed, the branch increment was greatest, and chlt (total chlorophyll content), P_max(maximum net photosynthetic rate), AQY (apparent quantum yield), daily average P_n (net photosynthetic rate), daily average WUE (water use efficiency), and daily average P_n/PAR (photosynthetically active radiation) of R. moulmainense were relatively higher or the highest. The chla/chlb (chlorophyll a/chlorophyll b), LCP (light compensation point), LSP (light saturation point), and R_d (dark respiration rate) were relatively lower or the lowest. In contrast, under 0% shading with flat bed, the chlorophyll content, P_max, AQY, daily average P_n, daily average WUE, and daily average P_n/PAR of R. moulmainense were the lowest, and the basal stem increment chla/chlb, LCP, LSP, and Rd were the highest.In general, with enhancing of shading (moderate shading) and soil water drainage, the branch increment, chlorophyll content and RWC appeared the trend of increasing gradually, while the other indexes all appeared the trend of decreasing gradually.[Conclusion] It is concluded that Rhododendron moulmainense is suitable for growing in the habitat with 50% shading and high bed.

Key words: Rhododendron moulmainense, shading, soil water drainage, plant growth, P_n, photoresponse curve, P_n/PAR, WUE

中图分类号:

S718.43

白宇清, 谢利娟, 王定跃. 不同遮荫、土壤排水处理对毛棉杜鹃幼苗生长及光合特性的影响[J]. 林业科学, 2017, 53(2): 44-53.

Bai Yuqing, Xie Lijuan, Wang Dingyue. Influences of Different Shading and Soil Water Drainage on Growth and Photosynthetic Characteristics of Rhododendron moulmainense[J]. Scientia Silvae Sinicae, 2017, 53(2): 44-53.

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