生态学报2017，Vol.37Issue(23)：7947-7955,9.DOI:10.5846/stxb201610272191
三峡库区消落带重建植被下土壤微生物生物量碳氮含量特征
Characteristics of soil microbial biomass C and N under revegetation in the hydro-fluctuation belt of the Three Gorges Reservoir Region
摘要
Abstract
Operation of the Three Gorges Dam Reservoir on the Yangtze River,China,has formed a hydro-fluctuation belt with an annual water level change of near 30 m spanning and an area of 350 km2.Such a change in water level has led to a direct shift in plant community composition within the hydro-fluctuation belt.Different vegetation types aher the riparian soil environment to varying extents,via their influence on the biogeochemical cycles of materials such as soil microbial biomass carbon and nitrogen.Accordingly,by determining the relationship between soil physicochemical properties and soil microbial biomass under different vegetation types,we can provide useful information for vegetation restoration in the hydrofluctuation belt of the Three Gorges Reservoir Region.To explore the changes in re-vegetated soil quality in the hydrofluctuation belt of the Three Gorges Reservoir,we examined the contents of soil microbial biomass carbon (SMBC) and soil microbial biomass nitrogen (SMBN) in this region.Soils under four typical vegetation types (natural grassland,artificial timber forest,crop land,and unplanted soil) were investigated in the reservoir riparian region of Zhong County (107°32′-108°14′E,30°03′-30°35′N),located in the center of Chongqing Municipality.The results showed that both SMBC and SMBN content was the highest in natural grassland and the lowest in unplanted soil.Under different types of vegetation,the ratio of SMBC/SMBN ranged from 8.02 to 10.25,the ratio of SMBC/soil organic carbon (SOC) was 2.40％-4.60％,and the ratio of SMBN/total nitrogen (TN) was 2.13％-3.58％.The SMBC/SOC and SMBN/TN ratios of forest soils were significantly higher than those of the unplanted soil (both P ＜ 0.05).Soil microbial biomass was significantly correlated with SOC,TN,and soil pH,and very significantly correlated with soil moisture.Our study showed that the physical and chemical properties of soil under revegetation had a significant impact on both SMBC and SMBN.Thus,revegetation facilitated an increase soil microbial biomass and enhanced soil quality in the hydro-fluctuation belt of the Three Gorges Reservoir Region.关键词
植被恢复/微生物生物量碳氮/三峡库区/消落带Key words
vegetation restoration/soil microbial biomass carbon, nitrogen/Three Gorges Reservoir/hydro-fluctuation belt引用本文复制引用
杨文航,秦红,任庆水,贺燕燕,李晓雪,李昌晓..三峡库区消落带重建植被下土壤微生物生物量碳氮含量特征[J].生态学报,2017,37(23):7947-7955,9.基金项目
重庆市林业重点科技攻关项目(渝林科研2016-8 （）
2015-6) （）
国家国际科技合作专项(2015DFA90900) （2015DFA90900）
中央财政林业科技推广示范项目(渝林科推[2014-10]) （渝林科推[2014-10]）
重庆市研究生科研创新项目(CYS2015068) （CYS2015068）
重庆市研究生科研创新项目(CYB16066) （CYB16066）
