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应用生态学报 ›› 2001, Vol. ›› Issue (3): 384-386.

• 研究论文 • 上一篇    下一篇

东北草原盐碱植物虎尾草的热值和能量分配特征的研究

郭继勋, 王若丹, 王娓   

  1. 东北师范大学草地研究所, 长春 130024
  • 收稿日期:2000-04-24 修回日期:2000-08-18 出版日期:2001-05-25
  • 通讯作者: 王若丹
  • 基金资助:
    国家自然科学基金资助项目(39970537)

Caloric value and energy allocation of Chloris virgata in northeast grassland

GUO Jixun, WANG Ruodan, WANG Wei   

  1. Institute of Grassland Science, Northeast Normal University, Changchun 130024
  • Received:2000-04-24 Revised:2000-08-18 Online:2001-05-25

摘要: 虎尾草全株、茎和叶的热值的季节变化规律相似,从7月初至8月初出现2个峰值,然后呈逐渐下降趋势.穗的热值变化呈U字型,2个峰值分别出现在8月初和9月中旬.立枯体热值变化不规则,最大在8月初.虎尾草种群地上部能量的季节动态呈双峰曲线,峰值分别出现在8月初和9月初,最大值在9月初为7381.27kJ·m-2.不同季节能量在各器官分配比率为:7月初为叶>茎;7月中旬为叶>茎>立枯体;8月份为茎>叶>穗>立枯体;9月初为茎>穗>叶>立枯体;9月中旬为茎>穗>立枯体>叶.能量垂直结构,地上部为从地表至20cm高度逐渐增加,最大值在10~20cm层占地上部的25.75%,然后逐渐下降.地下部的变化规律为随着深度增加能值逐渐减少,最大值在0~10cm层占地下部的74.21%.

Abstract: The rules of seasonal changes in caloric values of individual plant,stem,and leaves of Chloris virgata were similar,which had two peak values from early July to early August,and then decreased gradually.Those of inflorescence assumed U shape,and had two peak values in early August and middle September,respectively.The seasonal changes in caloric values of dead standing were irregular,and the maximum value was appeared in early August.The seasonal changes in existent energy value of the aboveground parts in Chloris virgata population presented double peak curve.The two peak values were appeared in early August and early September respectively,and the maximum value was 7381.27kJ·m-2 in early September.The energy allocation in different seasons was leaf>stem in early July,stem>leaf>dead standing in middle July,stem>leaf>inflorescence>dead standing in August,stem>inflorescence>leaf>dead standing in early September,and stem>inflorescence>dead standing>leaf in middle September.The vertical structure of energy in the aboveground parts was that the energy value gradually increased from the earth’s surface to 20cm high,and then decreased.The maximum value,which accounted for 25.75% of energy in the aboveground parts,was appeared in the layer of 10~20cm high.In the underground parts,the energy value progressively decreased with the increase of depth,and the maximum value,which accounted for 74.21% of energy in the underground parts,was appeared in the layer of 0~10 cm depth.

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