杨树人工林生长过程中碳储量动态

为研究不同林龄杨树(populus)人工林林木和土壤碳储量变化规律,了解杨树人工林碳汇能力,对江汉平原4、6和8年生杨树人工林的林木生物量和碳储量、土壤碳质量分数和碳储量进行了测定,结果表明:杨树人工林总碳储量随着林龄的增加而增加,从4年生到8年生杨树人工林总有机碳储量变化范围在41.30～117.08 t/hm2,其中,林木碳储量为13.52～55.67 t/hm2,0～20 cm土层土壤碳储量为27.78～61.41 t/hm2。土壤有机碳储量与大于2 mm的团聚体质量分数及土壤养分中的速效N质量分数呈极显著正相关;与全N和C/N质量分数呈显著正相关;与小于0.25 mm的团聚体质量分数呈显著负相关。

Carbon Storage Dynamics During the Growth of Poplar Plantation

A survey was conducted to measure the tree biomass and carbon storage as well as soil carbon content and storage in 4-,6-and 8-year-old popular plantations in Jianghan Plain in order to study the variation in carbon storage in trees and soils in different poplar plantations,and understand the carbon sink capacity of poplar plantation.Results indicated that the total carbon storage in the poplar plantations increased with increasing forest age.From 4-year-old to 8-year-old,the total carbon storage ranged from 41.30 to 117.08 t/hm2,the tree carbon storage from 13.52 to 55.67 t/hm2,and the soil carbon storage in 0-20 cm soil layer from 27.78 to 61.41 t/hm2.Highly significant positive correlations were observed between soil organic carbon storage and content of aggregates larger than 2 mm in diameter,soil available nitrogen,and significantly positive correlations between soil carbon storage and total nitrogen,carbon-to-nitrogen ratio,while a significantly negative correlation between soil carbon storage and content of aggregates less than 0.25 mm in diameter.