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东北草原盐碱植物虎尾草的热值和能量分配特征的研究 被引量:12

Caloric value and energy allocation of Chloris virgata in northeast grassland.
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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 7381.2 7kJ·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2 0cm高度逐渐增加 ,最大值在 10~ 2 0cm层占地上部的 2 5 .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 74.2 1% . 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.
出处 《应用生态学报》 CAS CSCD 2001年第3期384-386,共3页 Chinese Journal of Applied Ecology
基金 国家自然科学基金!资助项目 (39970 537)
关键词 虎尾草 热值 能量现存量 吉林 东北地区 草原 能量分配 Chloris virgata, Caloric value, Existent energy value.
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