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首页> 外文期刊>Ecological research >Storage ability of overwintering leaves and rhizomes in a semi-evergreen fern, Dryopteris crassirhizoma (Dryopteridaceae)
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Storage ability of overwintering leaves and rhizomes in a semi-evergreen fern, Dryopteris crassirhizoma (Dryopteridaceae)

机译：半常绿蕨类植物Dryopteris crassirhizoma（Dryopteridaceae）越冬叶片和根茎的越冬能力

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Dryopteris crassirhizoma is a rhizomatous semi-evergreen fern growing in the understory of deciduous forests. Although the top portion of the overwintering leaves began to wither in early winter, intensive senescence occurred in the spring, concurrently with new leaf development. Dry weight comparisons between organs revealed that the rhizome occupied the largest proportion of the total mass, followed by the pinnae. To assess the storage ability of overwintering leaves and the rhizome, seasonal changes in nitrogen content and the dry mass of pinnae and the rhizome were measured. Nitrogen (36.6%) was resorbed from winter-withering pinnae, but not from spring-withering pinnae. In contrast, a similar decrease in dry mass per unit area occurred between winter- and spring-withering pinnae (～15%). These results indicate that overwintering leaves serve as a carbohydrate storage organ, but do not serve as a nitrogen storage organ. Nitrogen was not translocated from the rhizome during the early growing season, but translocation did occur in late summer and autumn. The dry mass of the rhizome decreased by 18.4% in spring, at the time of new leaf expansion. The amount of exported dry matter from the rhizome was threefold larger than that from senescent pinnae. Therefore, the rhizome is a major carbohydrate storage organ in this species, although overwintering leaves also act as a carbohydrate storage organ.
机译：Dryopteris crassirhizoma是一种落叶性半常绿蕨类植物，生长在落叶林的林下。尽管越冬的叶子的顶部在冬季初开始枯萎，但在春季出现了强烈的衰老，并伴随着新的叶子发育。器官之间的干重比较显示，根茎占总质量的最大比例，其次是耳廓。为了评估越冬叶片和根茎的贮藏能力，测量了氮含量的季节性变化以及耳廓和根茎的干重。氮（36.6％）从冬季枯萎的羽绒被吸收，但从春季枯萎的羽绒被吸收。相反，在冬季和春季枯萎的羽梭之间，单位面积的干重减少了类似的现象（〜15％）。这些结果表明，越冬的叶子充当碳水化合物的储存器官，但不充当氮的储存器官。在生长的早期，氮不会从根茎中转移，但在夏末和秋季确实发生了氮转移。春季，新叶片扩张时，根茎的干重下降了18.4％。根茎中出口的干物质量是衰老品尼中出口的干物质量的三倍。因此，根茎是该物种中主要的碳水化合物储存器官，尽管越冬的叶子也充当了碳水化合物储存器官。

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