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作 者 ：刘国彬, 杨小寅

期 刊 ：植物生态学报 1988年 12卷 4期 页码：272-282

关键词：沙打旺；生物量；营养物质；

Keywords:Astragalus adsurgens, Biomass, Nutritive substance,

摘 要 ：沙打旺种群生长期地上部生物量、营养物质产量呈单峰曲线。各器官生物量及营养物质的高峰期不一致，地上部生物量在9月上旬(花期)达最大值；其中茎杆量峰值在花期以后；叶量峰值在花期以前。粗蛋白，粗脂肪产量高峰在生物量高峰前，分别为166g／m2，29g／m2；粗纤维、无氮浸出物产量高峰在生物量高峰后，达591g／m2、663g／m2。沙打旺生物量形成过程中土壤水分逐渐亏缺。从返青到生物量高峰，地上部生物量与根区3m土层贮水量呈显著负相关(r=-0.7726**)。沙打旺绝对生长速度为一单峰曲线，在7月上旬达最大值(14.9g／m2·d)：净同化率在返青后有一短暂上升期；相对生长速度持续下降。不同器官在不同生长发育阶段营养成份含量及其积累速度显著不同。

Abstract:The research indicated that the total aboveground biomass and the yield of various nutritive substances of the population of Astragalus adsurgens were featured in the single kurtosis during growing period. The fourth-order polynemial could be used to discribe and predict the yield in every period. The peak values for various organ biomass and the yield of nutritive substances were different The aboveground biomass reached the highest in early Sept. of florescence, of which the highest stem biomass occurred after florescence and the highest leaf biomass before it. The highest content of crude protein and crude fat appeared before the formation of highest biomass being 166g.m-2 and 29g·m-2 respectively. The peak for crude fiber and N-free extract appeared after biomass peak being591g.m-2 and 663g.m-2 respectively. The biomass formation of the herbage was a process in which soil moisture was of deficit gradually. There was obviously a negative correlation between the aboveground biomass and soil water storage in root zone (3m) during the period from turning green to peak biomass. The CGR was a single kurtosis, with its maximum occurred in early July (14.9g.m-2·day) . The NAR had a short increasing period but RGR continuously went down. The nutrition content and their accumulation rates were markedly different in various organs during growing period.

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