[中国广东鹤山人工林群落优势植物的热值与灰分含量]

[Caloric value and ash content of dominant plants in plantation communities in Heshan of Guangdong, China].

作者信息

Zeng Xiao-ping, Cai Xi-an, Zhao Ping, Rao Xing-quan

机构信息

South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2009 Mar;20(3):485-92.

PMID:19637580

Abstract

Different parts of twenty dominant plant species in five plantation communities on the subtropical hilly lands in Heshan of Gunagdong as well as the litters from three of the five plantation communities were sampled, and their gross caloric value (GCV) and ash content were measured by using a PARR-1281 oxygen bomb calorimeter and a muffle furnace. Based on the measurements, the ash-free caloric value (AFCV) of the samples was calculated, and the characteristics of caloric value and ash content of the samples, according to plant part, individual, and plant growth form, were analyzed. The results showed that the GCV and AFCV of leaf, branch, stem wood, stem bark, and root were in the range of 10.7-22.17 kJ x g(-1) and 13.89-23.04 kJ x g(-1), respectively. The GCV and AFCV of leaf were significantly higher than those of other parts (P < 0.05), and the individual plant' s weighted mean values of GCV and AFCV were in the range of 14.24-19.43 and 16.63-20.99 kJ x g(-1), respectively. The mean AFCV of plantation communities was in the order of tree layer (19.55 kJ x g(-1)) > shrub layer (19.46 kJ x g(-1) > herb layer (18.77 kJ x g(-1)), with indigenous coniferous tree (19.86 kJ x g(-1)) > indigenous broad-leaved tree (19.55 kJ x g(-1)) > exotic eucalyptus (19.18 kJ x g(-1)), while the mean ash content was just the opposite. In Acacia mangium, coniferous, and Schima plantation communities, the GCV and AFCV of litters were higher than those of various plant parts (P < 0.01). The litter-falls in A. mangium and coniferous plantations had higher mean GCV and AFCV than the litters and fresh leaves of tree layer, while the fresh leaves of tree layer in Schima plantation showed higher mean GCV and AFCV.

摘要

对广东鹤山亚热带丘陵地区五个人工林群落中20种优势植物的不同部位以及其中三个群落的凋落物进行了采样，并使用PARR - 1281氧弹热量计和马弗炉测定了它们的总热值（GCV）和灰分含量。基于这些测量结果，计算了样品的无灰热值（AFCV），并根据植物部位、个体和植物生长型分析了样品的热值和灰分含量特征。结果表明，叶、枝、茎木、茎皮和根的GCV和AFCV分别在10.7 - 22.17 kJ·g⁻¹和13.89 - 23.04 kJ·g⁻¹范围内。叶的GCV和AFCV显著高于其他部位（P < 0.05），单株植物的GCV和AFCV加权平均值分别在14.24 - 19.43和16.63 - 20.99 kJ·g⁻¹范围内。人工林群落的平均AFCV顺序为乔木层（19.55 kJ·g⁻¹）>灌木层（19.46 kJ·g⁻¹）>草本层（18.77 kJ·g⁻¹），乡土针叶树（19.86 kJ·g⁻¹）>乡土阔叶树（19.55 kJ·g⁻¹）>外来桉树（19.18 kJ·g⁻¹），而平均灰分含量顺序则相反。在马占相思、针叶树和木荷人工林群落中，凋落物的GCV和AFCV高于各种植物部位（P < 0.01）。马占相思和针叶人工林中的凋落物平均GCV和AFCV高于乔木层的凋落物和新鲜叶片，而木荷人工林中乔木层的新鲜叶片平均GCV和AFCV较高。