南京林业大学学报（自然科学版）Issue(6)：105-111,7.DOI:10.3969/j.issn.1000-2006.2015.06.019
马尾松人工林土壤有机碳特征及其与凋落物质量的关系
The characteristic of soil organic carbon and relationship with litter quality in Pinus massoniana plantation
摘要
Abstract
In order to explore the relationship between the soil organic carbon( SOC) and litter quality, we extracted the variables which reflected the litter quality characteristics by principal component analysis and set up a regression model between the litter quality and the SOC based on the standard investigation and sample measurement data of Pinus masso⁃niana plantation. The results showed that: ① The SOC density of stand at 0-100 cm soil depth was 39. 76-85. 85 t/hm2 , which increased with the stand age, it mean that the SOC of near⁃mature forest and mature forest were signifi⁃cantly higher than the young forest and middle⁃aged forest(P<0.05). The SOC content and average density of 10 cm thickness at each soil layer among different age groups decreased gradually with the increase of soil depth. ② The total existing amount of litter ( including semi⁃decomposed and undecomposed layer) was 1.54-2.25 t/hm2 , which increased with the stand age. However,element contents of litter showed no obvious variation. The existing amount of litter and the N, P content of each age group at different decomposed layers all showed that the semi⁃decomposed layer were higher than the undecomposed, the C content and C/N ratio showed the opposite rule. The average C content and C/N ratio of undecomposed layer were significantly higher than that in the semi⁃decomposed( P<0.05) , and the average N content in undecomposed layer was significantly lower than that in semi⁃decomposed ( P<0.05) , the average P content of different decomposed layers had no significant difference(P>0.05). ③ The analysis of multiple linear regression between SOC and litter quality showed that the principal component variables which reflected the litter quality of undecomposed layer had a significant correlation with the soil organic carbon density (P<0.05), C content and C/N ratio were negatively correlated with organic carbon density( P<0.05) , which displayed that the soil organic carbon density increased rapidly with the decrease of C content and C/N ratio of undecomposed layer and the decomposition rate accelerated. Therefore, replanting broadleaf species or applying nitrogen fertilizer could promote the rapid decompostion of undecomposed layer.关键词
马尾松人工林/土壤有机碳/凋落物质量Key words
Pinus massoniana/plantation/soil organic carbon/litter quality分类
农业科技引用本文复制引用
肖欣,王雄涛,欧阳勋志..马尾松人工林土壤有机碳特征及其与凋落物质量的关系[J].南京林业大学学报（自然科学版）,2015,(6):105-111,7.基金项目
国家自然科学基金项目（31160159，31360181）；中国科学院战略性先导科技专题 （）
