生态学报2018，Vol.38Issue(11)：3988-3997,10.DOI:10.5846/stxb201708221518
马尾松林两种林下植被土壤碳氮特征及其与凋落物质量的关系
Characteristics of soil carbon and nitrogen and relationship with litter quality under different understory vegetation in Pinus massoniana plantations
摘要
Abstract
This study investigated aerially seeded Pinus massoniana plantations to analyze soil carbon and nitrogen distribution characteristics and the relationship with litter quality under two understory vegetation types (Dieranopteris and Graminoid) by using matched-pair t test and redundancy analysis.The results showed that:(1) At soil depths of 0-10 and 10-20 cm,soil organic carbon,microbial biomass carbon,dissolved organic carbon,total nitrogen,available nitrogen,microbial biomass nitrogen,and dissolved organic nitrogen were significantly higher for graminoid than for Dicranopteris (P ＜ 0.05).However,at depths of 10-20 cm and 20-40 cm,the regularities of two understory vegetation types soil carbon and nitrogen indicators were different,but not significantly (P ＞ 0.05).(2) The C content and C/N ratio of the semi-decomposed and undeeomposed litter layer were significantly higher for Dicranopteris than for graminoid (P ＜ 0.05) The N content of semi-decomposed and undecomposed litter layer of Dicranopteris were significantly higher than for graminoid (P ＜ 0.05).The C content and C/N ratio of the undecomposed litter layer were significantly higher than of the semi-decomposed litter layer,and the N content of the semi-decomposed litter layer was significantly higher than of the undecomposed litter layer (P ＜ 0.05).(3) At 0-10 cm,the C/N ratio and C content of litter were significantly negatively correlated with soil carbon and nitrogen (P ＜ 0.05),and the N content was not significantly correlated with soil carbon and nitrogen (P ＞ 0.05).At 10-20 cm,the semi-decomposed litter C/N ratio of Dicranopteris was significantly correlated with soil carbon and nitrogen (P ＜ 0.05).The litter C content of graminoid was significantly correlated with soil carbon and nitrogen (P ＜ 0.01).The lower litter C/N ratio of understory vegetation was associated with a faster litter decomposition rate,which was helpful for accumulating soil nutrients.The litter C/N ratio of graminoid was lower than that of Dicranopteris,explaining why the soil carbon and nitrogen indicators were significantly higher for graminoid than for Dicranopteris.关键词
马尾松/飞播林/林下植被/土壤碳氮/凋落物质量Key words
Pinus massoniana/aerially seeded plantations/understory vegetation/soil carbon and nitrogen/litter quality引用本文复制引用
潘萍,赵芳,欧阳勋志,臧颢,宁金魁,国瑞..马尾松林两种林下植被土壤碳氮特征及其与凋落物质量的关系[J].生态学报,2018,38(11):3988-3997,10.基金项目
国家自然科学基金项目(31360181,31160159) （31360181,31160159）
