在4种光照处理条件下(处理Ⅰ:对所有分株光照处理;处理Ⅱ:对所有分株遮光处理;处理Ⅲ:仅对引入¹³ CO₂的复合节分株进行遮光处理;处理Ⅳ:仅对引入¹³ CO₂ 的复合节分株进行光照处理),分别从结缕草(Zoysia japonica Steud.)克隆植株的基部、中部和梢部(分别为第7、第17 和第24 复合节)分株引入¹³ CO₂ ,对¹³ C 在克隆植株不同器官内的分配格局及传输特征进行了研究。实验结果表明:从克隆植株的不同部位引入¹³ CO₂ ,¹³ C 的传输格局均表现出以引入点为起始点沿匍匐茎向基和向顶双向运输的趋势,但向顶传输的陡度值均小于向基传输的陡度值,向顶传输的距离则均大于向基传输的距离,说明¹³ C 的向顶传输更具优势。分株叶片、匍匐茎和复合节根中13 C的传输格局有一定差异;引入点分株叶中δ¹³ C 值较高,其他分株叶中δ¹³ C 值均迅速降低;匍匐茎内δ¹³ C 值总体较低,但13 C 传输范围广;当¹³ CO₂引入点位于基部和中部时复合节根的δ¹³ C 值高于匍匐茎,但当¹³ CO₂引入点位于梢部时复合节根的δ¹³ C 值低于匍匐茎。从¹³ C 的传输范围及陡度值看,总体上分株叶中¹³ C 的陡度值显著大于复合节根和匍匐茎;在匍匐茎中¹³ C 呈现出平缓的传输格局但传输距离最远。此外,在4 种光照处理条件下,处理Ⅳ的根及匍匐茎中¹³ C 向基或向顶传输的陡度值总体上均最高,且各器官¹³ C 的传输距离均最远;但从基部、中部和梢部分株引入¹³ CO₂后,分别在处理Ⅱ、处理Ⅲ和处理Ⅰ的分株叶中¹³ C 向基或向顶传输的陡度值均最高。根据实验结果,对不同光照条件下结缕草克隆植株不同器官内光合产物的分配格局及其生态效应进行了探讨。

Under four light treatment conditions (treatment Ⅰ: full light treatment to all multiple-node ramets; treatment Ⅱ: shading treatment to all multiple-node ramets; treatment Ⅲ: shading treatment only to multiple-node ramets fed with ¹³CO₂; treatment Ⅳ: full light treatment only to multiple-node ramets fed with ¹³CO₂), ¹³CO₂was fed from the basal, middle and distal ramets (i. e. the seventh, the seventeenth and the twenty-fourth multiple-node ramets) of clonal plant of Zoysia japonica Steud., and ¹³C distribution pattern and translocation characteristics in different organs of clonal plant of Z. japonica were studied. The results show that after ¹³CO₂ fed from different part ramets, ¹³C translocation pattern all appears the trend of bidirectional transport toward basal and toward distal along the stolons taking fed ramets as the starting point, but the translocation gradient value toward distal all is lower than that of toward basal and the translocation distance toward distal is all bigger than that of toward basal, meaning the distal translocation of ¹³C has more advantage. There is a certain difference in translocation pattern of ¹³C in ramet leaf, stolon and multiple-node root. The δ¹³C value in ramet leaf fed with ¹³CO₂ is higher but that in other ramet leaves decreases sharply. The  δ¹³ C value in stolon is generally lower but the 13C translocation range is extensive. The δ¹³C value in multiple-node root is higher than that in stolon when ¹³CO₂ is fed from the basal and middle ramet leaves, while that is lower than that in stolon when ¹³CO₂ is fed from the distal ramet leaves. From the translocation range and gradient value, generally, the ¹³C gradient value in ramet leaf is significantly higher than that in multiple-node root and stolon. And in stolon, ¹³C translocation appears a gentle pattern but its translocation distance is the farthest. Moreover, under four light treatment conditions, the gradient value of ¹³C translocation toward basal or distal directions in multiple-node root and stolon is the highest and the ¹³C translocation distance in all organs is the farthest in treatment Ⅳ. But the gradient value of ¹³C translocation toward basal or distal directions in ramet leaf is the highest respectively in treatment Ⅱ, Ⅲand Ⅰwhen ¹³CO₂ is fed from the basal, middle and distal ramets. According to these experimental results, the distribution pattern of photosynthetic products and its ecological effect in different organs of clonal plant of Z. japonica under different light conditions are discussed.