城市不同功能分区草坪绿地土壤有机碳与碱解氮垂直分布特征

为了解城市草坪绿地土壤有机碳与碱解氮垂直分布特征,以长春市为例,选取不同功能分区(公园、道路、居住区、校园)草坪土壤为研究对象,分析了土壤pH值、有机碳(SOC)、碱解氮(AN)的垂直分布特征及相关性。结果表明:草坪绿地类型与土壤剖面对土壤pH值、有机碳(SOC)、碱解氮(AN)含量影响显著(P<0.05)。其中,不同功能区0～30 cm土壤pH值为:校园绿地>道路绿地>居住区绿地>公园绿地;不同功能区0～30 cm土壤SOC含量为:公园绿地>居住区绿地>校园绿地>道路绿地;不同功能区0～30 cm土壤AN含量为:公园绿地>居住区绿地>校区绿地>道路绿地。相关性分析表明:土壤SOC与AN呈正相关,而绿地土壤的pH值与SOC含量呈负相关。由此结论我们可以通过增加土壤中碱解氮含量,调节土壤pH值,来使土壤得到优化,增加固碳能力,减弱温室效应,改善生态环境。

Vertical Distribution Characteristics of Soil Carbon and Alkaline Nitrogen in Different Types of Urban Lawn Soil

In order to evaluate characters of soil carbon and alkaline nitrogen in urban green lands,investigations were made on soil organic carbon,alkaline nitrogen and their vertical distribution characteristics and correlation in unban green lands(park,road,residential land and campus)in Changchun City.The results showed that soil physical and chemical properties,organic carbon(SOC)and alkalinity nitrogen(AN)content were significantly influenced by green space type and soil profile(P<0.05).The mean values of soil pH in 0~30 cm soil depth under different green lands were:campus>road>residential land>park;The mean values of soil SOC in 0~30 cm soil depth under different green lands were:park>road>residential land>campus;The mean values of soil AN in 0~30 cm soil depth under different green lands were:park>residential land>campus>road;Correlation analysis showed that soil SOC was positively correlated with AN,while green soil pH was negatively correlated with SOC content.This led to the conclusion that the alkalysis nitrogen content should be increased in the soil,and the soil pH should be adjusted to optimize the soil,increase the carbon sequestration,weaken the greenhouse effect and improve the ecological environment.