浙江农林大学学报2013，Vol.30Issue(1)：22-31,10.
上海城市绿地不同植物群落土壤呼吸及因子分析
Soil respiration for different plant communities in an urban green-belt of Shanghai
摘要
Abstract
The soil respiration rate of nine plant communities (Cinnamomum camphora, Torreya grandis-Ginkgo biloba, Cedrus deodara, Ginkgo biboba, Osmanthus fragrans , Cercis sp., Lolium perenne-Cynodon dactylon, Zoysiajaponica, and Cynodon dactylon) in Shanghai City were studied with a CFX-2 Soil Respiration Chamber, and the main influential factors were identified, and the aim was to evaluate correctly soil respiration of urban soil. The digital thermometer was used to test the air temperature, the soil temperature at 5 cm depth and the soil temperature at 10 cm depth. And all data were average of three replications, and a correlation analysis was also employed. Results showed that soil respiration rates varied by season with the maximum found from June to September and the minimum from December to the following March. Daily variation in the soil respiration rate under communities of trees and bushes was generally stable; whereas a lawn had a single-peaked curve. The maximum soil respiration rates (5.51 mol·m-2·s-1) found under Cynodon dactylon and the minimum (2.76 times less) found under a Cercis sp. community. The soil respiration rate had a significant exponential correlation (P<0.01) with the air temperature, the soil temperature at 5 cm depth, and the soil temperature at 10 cm depth. Soil water content had an effect on soil respiration under lawns, but it had a relatively small influence on tree and bush communities. The soil labile organic carbon content was ranked in the following order: light fraction organic carbon (LFOC) > microbial biomass carbon (MBC) > dissolved organic carbon (DOC), but MBC and DOC had the greatest influence on the soil respiration rate. The maximum released quantity of CO2 reached to 33.18 t·hm-2·a-1 under lawns, which was 1.95 times that of trees and 2.12 times that of bushes.关键词
土壤学/城市绿地/土壤呼吸/植物群落/土壤温度/土壤含水率/易变碳/二氧化碳Key words
soil science/ urban green-belt/ soil respiration/ plant communities/ soil temperature/ soil water content/ labile organic carbon/ CO2分类
农业科技引用本文复制引用
梁晶,方海兰,郝冠军,孙倩..上海城市绿地不同植物群落土壤呼吸及因子分析[J].浙江农林大学学报,2013,30(1):22-31,10.基金项目
上海辰山植物园资助项目(G102402) （G102402）
