内蒙古额尔古纳草甸草原植物器官热值研究
吴逊文 , 许银龙 , 莫宇 , 罗清 , 李佳欣 , 张伊琳 , 于杰 , 张靖 , 赵钰 , 鲍雅静
草业学报 ›› 2026, Vol. 35 ›› Issue (06) : 13 -23.
内蒙古额尔古纳草甸草原植物器官热值研究
Calorific values of plant organs of vegetation growing on the Erguna Meadow Steppe, Inner Mongolia
为了探究草甸草原生态系统的能量固定与分配机制,本研究通过对内蒙古额尔古纳草甸草原中的36种植物进行热值分析,系统探讨了不同功能群(豆科、禾草、杂类草)及不同水分生态类型(旱生、中旱生、旱中生、中生、湿中生)及其植物器官的热值变化规律和能量分配。研究表明:1)36种植物的平均热值为17.31 kJ·g-1,其中植物器官果的平均热值最高,花与叶的平均热值次之,茎的平均热值最低,且均呈现显著差异(P<0.05),在主要科中,豆科植物热值最高,显著高于菊科、毛茛科、石蒜科等,而蔷薇科植物热值则与石蒜科差异不显著。2)在功能群中,豆科热值显著高于禾草与杂类草(P<0.05),其中豆科植物的叶热值显著高于其他器官(P<0.05),禾草的叶热值高于茎,而杂类草则是以花、果热值显著高于茎、叶(P<0.05)。3)在不同水分生态功能群中,植物整株热值之间并未表现出显著差异(P>0.05),除中旱生植物外,其他水分生态功能群均呈现花果热值显著高于茎叶(P<0.05)的结果,水分生态功能群中热值对于器官水平响应显著。4)植物整株热值与碳含量呈显著正相关,表明碳含量是影响植物能量储存的关键基础,植物各器官热值与碳含量同样呈显著正相关,但器官相关性强度不同(花>叶>茎>果),其中花器官相关性最强(r=0.91),果器官呈现相对较低的相关性(r=0.79)。
The aim of this study was to investigate the energy fixation and allocation mechanisms in meadow steppe ecosystems. To this end, we systematically analyzed the calorific values of 36 plant species growing on the Erguna Meadow Steppe, Inner Mongolia. We analyzed variations in calorific values and energy allocation patterns across plant organs, functional groups (Fabaceae, Poaceae, forbs), and hydric ecological types (xerophytes, meso-xerophytes, xero-mesophytes, mesophytes, wet-mesophytes). The results showed that: 1) The average calorific value of the 36 plant species was 17.31 kJ·g-1. Among the plant organs, fruit had the highest average calorific value, followed by flowers and leaves, while stems had the lowest, with all differences being significant (P<0.05). Among the major families, Fabaceae exhibited the highest calorific values, significantly higher than those of Asteraceae, Ranunculaceae, and Amaryllidaceae (P<0.05), but there was no significant difference in calorific value between Rosaceae and Amaryllidaceae. 2) Among the functional groups, Fabaceae had significantly higher calorific values than Poaceae and forbs (P<0.05). In Fabaceae, calorific values were significantly higher for the leaf than for the other organs (P<0.05). In Poaceae, the calorific values of the leaves were higher than those of the stems; in forbs, the calorific values of flowers and fruit were significantly higher than those of stems and leaves (P<0.05). 3) The whole-plant calorific values did not differ significantly among hydric ecological types (P>0.05). However, except for meso-xerophytes, all other hydric ecological types showed significantly higher calorific values for flowers and fruits than for stems and leaves (P<0.05), indicating that calorific values in hydric ecological types respond significantly at the organ level. 4) Whole-plant calorific values were significantly positively correlated with carbon content, suggesting that carbon content is a key factor influencing plant energy storage. Similarly, calorific values of plant organs were also significantly positively correlated with carbon content, but the strength of the correlation varied among organs (flowers>leaves>stems>fruits), with the strongest correlation in flowers (r= 0.91) and the weakest in fruit (r=0.79).
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国家自然科学基金项目(32371639)
国家自然科学基金项目(31971464)
辽宁省科技计划联合计划项目(2024JH2/102600110)
中央高校基本科研业务费(044420250083)
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