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浙江天童常见种幼苗的光合特性及非结构性碳水化合物储存

, PP. 35-44

Keywords: 天童&searchField=keyword">天童')"href="#">天童,常见种,幼苗,光合特性,非结构性碳水化合物

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Abstract:

对浙江天童国家森林公园20种常见种幼苗的光合特性以及非结构性碳水化合物(NSC)储存进行了研究.结果表明:常绿种幼苗拥有较低的光补偿点(LCP)、暗呼吸速率(Rd)和较高的表观量子效率(AQE)、最大净光合速率(Amax);落叶种则表现出较高的LCP、Rd和较低的AQE、Amax.常绿灌木的光饱和点(LSP)显著大于常绿乔木,而其他光合参数均无显著差异.根部是非结构性碳水化合物储存的主要场所.常绿种幼苗根部可溶性糖、淀粉、NSC含量以及茎部可溶性糖含量均显著高于落叶种,而两者茎部淀粉和NSC含量差异不显著.常绿灌木根部可溶性糖、NSC含量以及茎部淀粉、NSC含量均显著大于常绿乔木,而两者根部淀粉和茎部可溶性糖含量差异不显著.“高生长,低储存”的策略主要以喜阳或作为先锋种的落叶种为代表;强耐荫的常绿灌木主要采用“低生长,高储存”的策略进行林下更新;半耐荫的常绿乔木树种的光合能力与碳水化合物储存介于两者之间.

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