天津滨海几种人工植被的碳汇作用研究

Effect of Carbon Storage in Several Artificial Vegetations on Sea-beach Salinity Soil in Tianjin, China

对天津开发区滨海几种人工植被的碳净贮量、平均积累速率及其分配格局作了初步研究:碳净贮量从大到小依次为乔-灌-草群落(12.93 t/hm2)>灌木群落(12.205 t/hm2)>草本群落(4.725 L/hm2)>灌-草群落(1.61 t/hm2)。平均碳净积累速率是灌木群落(4.07 t/hm2·a)>乔-灌-草群落(3.23 t/hm2·a)>草本群落(1.18 t/hm2·a)>灌-草群落(0.81 t/hm2·a)。以木本植物为主的群落中,主要依靠地上部分贮存碳,并且随着层次的增加,地上部分贮量所占百分比有上升的趋势。乔-灌-草群落中,乔木贮量占群落总净贮量的84.49％、灌木占14.81％、草本仅0.70％;灌-草群落中,灌木占91.95％,草本占8.05％。乔木种的各器官碳净贮量中,皮所占比例最小,根、枝、干三者比例较为接近,都在30％左右;灌木种则都是枝>根。

Based on the data collected by observation, the net carbon storage, storage rate and spatial distribution of carbon were studied in several artificial vegetations on sea-beach, Tianjin, China. The results showed that carbon content in different organs and different species varied in 0. 303 7-0. 470 5 g/g, and was in the order as: tree> shrub> perennial herb> annual plant. The percent of net carbon storage of bark in trees was lower than that in other organs, and that in root, in stem and in branch were approximate, about 30% separately. The net carbon storage of 4 communities were decreased with the order: 12. 93 t/hm2 in tree-shrub-herb community, 12. 205 t/hm2 in shrub community, 4. 725 t/hm2 in herb community and 1.61 t/hm2 in shrub-herb community. The rate of net carbon storage were 4. 07 t/hm2 ?a in shrub community, 3. 23 t/hm2. a in tree-shrub-herb community, 1. 18 t/hm2·a in herb community and 0. 81 t/hm2 ·a in shrub-herb community. The carbon storage of the above grounds in wooden communities were higher than those of underground, and increased with layers. The proportions of net carbon storage in different layers of compound storied community were also different: they were tree (84. 49%)>shrub (14. 81%)> herb (0. 70%) in tree-shrub-herb community and shrub(91. 95%) >herb(8. 05%) in shrub-herb community.