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衡阳紫色土丘陵坡地不同恢复阶段土壤基础呼吸及代谢熵的变化
陈 璟,杨 宁
湖南环境生物职业技术学院园林学院,湖南环境生物职业技术学院园林学院
摘要:  为探讨衡阳紫色土丘陵坡地不同植被恢复阶段中的土壤呼吸特征,采用空间序列代替时间序列的方法,对土壤基础呼吸(SBR)及代谢熵(qCO2)的变化进行了研究,并分析了它们与土壤性质的关系。结果表明:不同植被恢复阶段中的SBR、qCO2 存在明显差异,从裸地(Ⅰ)、草本群落(Ⅱ)、灌木群落(Ⅲ)到乔木群落(Ⅳ)阶段,SBR 显著增强(P<0.05),qCO2 显著减小(P<0.05)。每个恢复阶段,土层深度从0~20 cm、20~40 cm 到40~60 cm,SBR 显著减弱(P<0.05),qCO2 显著增加(P<0.05)。从Ⅱ、Ⅲ至Ⅳ阶段,根际(R)与非根际(S)的SBR 显著增加(P<0.05),SBR 的R/S 显著减小(P<0.05);而qCO2 逐渐减小(P>0.05),qCO2 的R/S 逐渐上升(P>0.05),SBR 与qCO2 均表现出R > S 的特点。相关分析表明,SBR 与土壤微生物量碳(SMBC)、土壤温度(SST) 呈极显著正相关(P<0.01),与土壤容重(SBD)呈显著负相关(P<0.05);qCO2 与SMBC 呈极显著负相关(P<0.01),与ST呈显著负相关(P<0.05),与SBD和pH值呈显著正相关(P<0.05)。这些对于构建植被恢复技术体系具有理论与实践意义。
关键词:  植被恢复  土壤基础呼吸  代谢熵  紫色土  衡阳
DOI:10.3969/j.issn.1005-3395.2013.06.004
分类号:Q948
基金项目:国家林业局948 重点项目(2008-4-32);湖南省重点课题(62020608001);湖南省教育厅科学研究项目(13C247)资助
Changes in SBR and qCO2 at Different Re-vegetation Stages on Slopingland with Purple Soils in Hengyang of Hunan Province, South-central China
CHEN Jing and YANG Ning
HUnan,hu
Abstract:  In order to understand the changes in soil respiration of sloping-land with purple soils in Hengyang, the soil basal respiration (SBR), metabolic quotient (qCO2) were studied by using the space series to replace time series, and the relationships between SBR, qCO2 and soil properties were analyzed. The results showed that SBR and qCO2 had significant difference at different re-vegetation stages. From bare land stage (Ⅰ), herb community stage (Ⅱ), shrub community stage (Ⅲ) to tree community stage (Ⅳ), SBR significantly increased (P<0.05), while qCO2 significantly decreased (P<0.05). At every re-vegetation stage, SBR significantly decreased (P<0.05) along 0-20 cm, 20-40 cm, and 40-60 cm soil layers, while qCO2 significantly increased (P<0.05). From Ⅱ, Ⅲ to Ⅳ stages, SBR of rhizosphere (R) and non-rhizosphere (S) significantly increased (P<0.05), and R/S of SBR significantly decreased (P<0.05), while qCO2 of R and S gradually decreased (P>0.05), and R/S of qCO2 gradually increased (P>0.05). SBR and qCO2 in rhizosphere were bigger than those in non-rhizosphere. Correlation analysis showed that SBR had significantly positive correlation with soil microbial biomass carbon (SMBC) and soil temperature (ST) (P<0.01), and significantly negative with soil bulk density (SBD) (P<0.05). qCO2 had significantly negative correlation with SMBC (P<0.01) and ST (P<0.05), but significantly positive with SBD and pH value (P<0.05). These would have a theoretical and practical significance for building vegetation restoration technique system.
Key words:  Re-vegetation  Soil basal respiration (SBR)  Metabolic quotient (qCO2)  Purple soil  Hengyang

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