生态学报2018，Vol.38Issue(7)：2288-2298,11.DOI:10.5846/stxb201705040824
侵蚀退化地植被恢复过程中芒萁对土壤可溶性有机碳的影响
Effects of Dicranopteris dichotoma on soil dissolved organic carbon in severely eroded red soil
摘要
Abstract
Understory,an important component of the forest ecosystem,plays an important role in maintaining forest structure and soil quality.To analyze the relationship between soil dissolved organic carbon (DOC),belowground biomass,and DOC leachates of aboveground biomass,we conducted a comparative experiment of the presence or absence of understory Dicranopteris dichotoma on severely eroded red soil.The results showed that the aboveground and belowground biomass,and the content of soil DOC increased significantly with understory D.dichotoma coverage (P＜0.05);the effect of D.dichotoma on the surface soil (0-20cm) was greater than the deep soil (20-100cm) (P＜0.05).The correlation analysis showed that there was a significant positive correlation between soil DOC storage and fine root biomass (P＜0.05),indicating that the vertical distribution of underground roots directly affects the soil DOC reserves.Moreover,there was a significant positive correlation between soil DOC with fresh leaf (Pinus massoniana and D.dichotoma) and litter (P.massoniana and D.dichotoma) leachates during vegetation restoration (P＜0.01),but there was only a significant correlation with fresh leaf (P.massoniana) leachates in the bare ground (P＜0.05).The effect of the litter leachates on the soil DOC storage was higher than the fresh leaves.The soil microbial biomass carbon and microbial entropy in D.dichotomacovered land were significantly higher than bare land in the process of vegetation restoration.Therefore,D.dichotoma may provide more substrates to participate in soil material and nutrient cycling,contributing greatly to soil DOC,which further provides important nutrient reabsorption sources for restoration of P.massoniana forest in eroded areas.It is possible that D.dichotoma coverage increases microbial activity and promotes assimilation of soil microorganisms;thereby playing an important role in the accumulation of soil organic carbon by improving utilization of microbial carbon sources.关键词
生态恢复/芒萁/可溶性有机碳/碳利用效率Key words
ecological restoration/Dicranopteris dichotoma/dissolved organic carbon/carbon use efficiency引用本文复制引用
任寅榜,吕茂奎,江军,谢锦升..侵蚀退化地植被恢复过程中芒萁对土壤可溶性有机碳的影响[J].生态学报,2018,38(7):2288-2298,11.基金项目
国家自然科学基金项目(31370465,U1405231) （31370465,U1405231）
“973”计划前期专项课题(2012CB722203) （2012CB722203）
