蒙辽农牧交错区草地植物种群和功能群热值研究

Calorific Values of Grassland Plant Population and Functional Groups in the Agro-pastoral Ecotone of Inner Mongolia and Liaoning Province Border

本研究通过对蒙辽农牧交错区的61种植物进行热值分析,分析了不同功能群热值的变化,以期为农牧交错区草地能量固定及资源合理利用提供科学数据和理论支撑。研究结果表明:61种植物的热值平均值为17.14KJ·g^(-1)。不同生活型功能群比较,一二年生草本热值显著低于多年生禾草和灌木,与半灌木和多年生杂类草均无显著差异。多年生禾草、灌木、多年生杂类草和半灌木之间无显著差异。不同水分生态功能群之间的热值均无显著差异。旱中生植物的热值平均值略低于其他组。百合科(Liliaceae)、豆科(Leguminosac)、禾本科(Gramineae)、菊科(Compositae)、蔷薇科(Rosaceae)之间热值无显著差异,藜科(Chenapodiaceae)热值显著低于其他科。植物热值与碳含量呈显著正相关关系。

Agro-pastoral ecotone is an important ecological barrier in China,and its ecological environment problems are becoming increasingly prominent.In this study,61 species of plants in 27 grassland plots in the agro-pastoral ecotone of Inner Mongolia and Liaoning border were collected for calorific value analysis under the random sampling condition.The changes of calorific value of plants in different types of functional groups were explored to provide scientific data and research support for energy fixation and rational use of grassland resources in the agro-pastoral ecotone.The results showed that:The average calorific value of 61 species was 17.14 KJ·g-1.Among them,Salsola collina had the lowest calorific value(12.82 KJ·g-1),the caloric value of Polygala tenuifolia was the highest(20.07 KJ·g-1),and the total calorific value was normal distribution.Comparing the caloric values of different life-type functional groups,the caloric value of annuals and biennials was significantly lower than perennial grasses and shrubs(P<0.05),which had no significant difference with sub-shrubs and perennial forbs.There was no significant difference among perennial grasses,shrubs,perennial weeds and semi-shrubs(P>0.05).There was no significant difference in caloric value between different water ecological functional groups(P>0.05).The plant caloric mean value of the Xero-mesophytes was slightly lower than other groups.There was no significant difference in calorific value among Liliaceae,Leguminosac,Gramineae,Compositae and Rosaceae,and the caloric value of Chenapodiaceae was significantly lower than other families(P<0.05).There was a significant positive correlation between plant calorific value and carbon content(P<0.05).