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    杨自立, 马履一, 贾忠奎, 王梓. 不同供氮水平对栓皮栎播种苗光响应曲线的影响[J]. 北京林业大学学报, 2011, 33(5): 56-60.
    引用本文: 杨自立, 马履一, 贾忠奎, 王梓. 不同供氮水平对栓皮栎播种苗光响应曲线的影响[J]. 北京林业大学学报, 2011, 33(5): 56-60.
    YANG Zi-li, MA Lü-yi, JIA Zhong-kui, WANG Zi. Effect of different nitrogen supply on light-response curves of Quercus variabilis seedlings[J]. Journal of Beijing Forestry University, 2011, 33(5): 56-60.
    Citation: YANG Zi-li, MA Lü-yi, JIA Zhong-kui, WANG Zi. Effect of different nitrogen supply on light-response curves of Quercus variabilis seedlings[J]. Journal of Beijing Forestry University, 2011, 33(5): 56-60.

    不同供氮水平对栓皮栎播种苗光响应曲线的影响

    Effect of different nitrogen supply on light-response curves of Quercus variabilis seedlings

    • 摘要: 为科学制定栓皮栎播种苗氮肥管理措施,在砂培条件下,采用指数施肥的试验方法,设置4个供氮水平(0、120.6、216.4和329.2 mg/(株•a)),探求不同的供氮水平对栓皮栎播种苗光响应特征曲线的影响。结果表明,在苗木生长的不同阶段,供氮量的差异对叶片光响应曲线的影响有所差别。生长初期,氮素对栓皮栎播种苗光响应特征曲线参数的影响不显著。速生期,缺氮(0 mg/(株•a))严重影响苗木的光合性能,导致栓皮栎播种苗的光饱和点(LSP)、最大净光合速率(Pmax)、表观量子效率(α)偏低,而光补偿点(LCP)偏高;当供氮量从120.6 mg/(株•a)增大到216.4 mg/(株•a)时,苗木Pmax并没有明显变化,但苗木的LCP降低,LSP升高;过量供氮(329.2 mg/(株•a))反而导致叶片的光合性能下降。生长末期,在其他处理苗木叶片光合性能均有不同程度下降的情况下,216.4 mg/(株•a)水平的苗木仍然保持着相对较高的光合能力。

       

      Abstract: In order to provide a theoretical foundation for nitrogen fertilizer management of Quercus variabilis seedlings, using exponential nitrogen fertilization regimes, the effects of nitrogen treatments on light-response curves of Q. variabilis seedlings were studied under sand-cultured condition. The seedlings were planted in pots, supplied with four nitrogen application levels (0, 120.6, 216.4 and 329.2 mg/(seedling•year)). The results show that various nitrogen application levels had different effects on the light-response curves of Q. variabilis leaves, depending on the growth phases. At the initiation phase, all the simulation parameters of light-response curves showed no significant differences among treatments. At the fast-growth phase, the lack of nitrogen weakened the photosynthetic capability of seedlings in treatment CK (0 mg/(seedling•year)) sharply, which reduced the light saturation point (LSP), maximum net photosynthetic rate (Pmax) and the apparent quantum efficiency (α); meanwhile, the light compensation point (LCP) expressed a trend of increase. When the nitrogen level was raised from 120.6 to 216.4 mg/(seedling•year), no significant variation about Pmax was found between the two treatments; however, the LCP of the seedlings in 216.4 mg/(seedling•year) treatment was lower and the LSP was higher. Yet, excessive nitrogen supply (329.2 mg/(seedling•year)) played a negative role on the photosynthetic ability of Q. variabilis seedlings. At the later phase, relatively higher photosynthetic efficiency was maintained in the seedlings in 216.4 mg/(seedling•year) treatment, comparing with the common decline in other three treatments.

       

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