衡阳紫色土丘陵坡地植被恢复阶段土壤特性的演变

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 衡阳紫色土丘陵坡地植被恢复阶段土壤特性的演变 DOI: 10.5846/stxb201301030012 作者: 作者单位: 湖南环境生物职业技术学院,湖南农业大学生物科学技术学院,湖南环境生物职业技术学院,湖南环境生物职业技术学院,湖南环境生物职业技术学院,湖南环境生物职业技术学院,湖南环境生物职业技术学院 作者简介: 通讯作者: 中图分类号: S154.2；S155.2 基金项目: 湖南省重点项目（62020608001）；湖南省科技厅项目（S2006N332）；湖南省教育厅科学研究项目（12C1057）；湖南省普通高校优秀青年骨干教师培养对象资助项目；湖南环境生物职业技术学院南岳学者基金项目（湘环职院[2012]4号）资助 Changes of soil properties in re-vegetation stages on sloping-land with purple soils in hengyang of Hunan Province, South-central China Author: Affiliation: Hunan Environmental-Biological Polytechnic College,a College of Landscape Architecture,bCentre of Practice and Train,Hengyang,,,,,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用空间代替时间序列方法，对衡阳紫色土丘陵坡地不同恢复阶段的土壤理化性质、土壤微生物数量、土壤微生物学性质和主要酶活性特征以及它们之间的相互关系进行研究。结果表明：不同恢复阶段土壤理化特征存在明显差异，从狗尾草群落阶段（Ⅰ）、紫薇-狗尾草群落阶段（Ⅱ）、牡荆+剌槐群落阶段（Ⅲ）到枫香+苦楝-牡荆群落阶段（Ⅳ），0-40cm土壤含水量、容重、非毛管孔隙度、孔隙比、大于0.25mm水稳性团聚体含量、有机碳（SOC）、全氮（TN）、碱解氮（AN）与速效磷（AP）显著增加，土壤容重显著减小，土壤pH值逐渐减小，土壤全磷（TP）、全钾（TK）与速效钾（AK）其差异变化不大，土壤理化特征的差异引起土壤微生物数量、微生物学性质与土壤酶活性的变化；不同恢复阶段土壤微生物总数显著增加，其中细菌数量显著增加，而真菌与放线菌数量显著减少；不同恢复阶段土壤基础呼吸（SBR）、土壤微生物量碳（SMBC）、土壤微生物量氮（SMBN）、土壤微生物量磷（SMBP）、土壤微生物熵（Cmic/Corg）显著增加，而代谢熵或呼吸熵（qCO2）显著减小，碳氮比（C/N）逐渐减小；不同恢复阶段均显著地增加了脲酶（URE）、蔗糖酶（INV）与磷酸酶（APE）的活性；土壤理化性状、土壤微生物数量、土壤微生物学性质与土壤酶活性之间存在密切的相关性。 Abstract:The purpose of the paper was to study the purple soil's physico-chemical characteristics, microbial populations, microbial properties, enzyme activities, and the relationships between them in different stages of re-vegetation on sloping-land in Hengyang of Hunan Province, South-central China. We took soils of 0-40cm depth in typical areas in Setaria viridi community stage (Ⅰ); Lagerstroemia indica-Setaria viridi community stage (Ⅱ); Vitex negundo var. cannabifolia+Robinia pseudoacacia community stage (Ⅲ); and Liquidamdar formosana+Melia azedarach-Vitex negundo var. cannabifolia community stage (Ⅳ) as our test objects by using the space series to replace time courses.The results showed that: (1) From Ⅰ, Ⅱ, Ⅲ to Ⅳ, the soil water content, total soil porosity, ratio of non-capillary porosity to capillary porosity, >0.25mm water stable aggregates content, SOC (Soil Organic C), TN (Total N), AN (Available N) and AP (Available P) increased significantly. In contrast, soil bulk density decreased significantly, pH decreased slightly, and there were no significant differences in TP (Total P), TK (Total K) and AK (Available K). The changes in the number of soil microbes, microbial properties and the soil enzyme activities have resulted from the differences in the soil physico-chemical characteristics. (2) The number of soil microbes increased significantly, with a significant increase in the number of bacteria, but the numbers of fungi and actiomycetes decreased significantly in the process of the succession. (3) The SBR (Soil Base Respiration), SMBC (Soil Microbial Biomass C), SMBN (Soil Microbial Biomass N), SMBP (Soil Microbial Biomass P) and Cmin/Corg increased significantly. The qCO2 decreased significantly, and C/N decreased, with no significant difference in the process of succession. The activities of URE (Urease), INV (Invertase) and APE (Alkaline phosphatase) significantly increased in the process of the succession. (4) There were close correlations among the soil physico-chemical characteristics, the number of soil microbes, the soil microbial properties and the soil enzyme activities. This study will, to some degree, enrich the restoration ecology of this area and provide a theoretical basis for the re-vegetation and reconstruction of ecosystems on sloping land with purple soils in Hengyang of Hunan Province, South-central China. 参考文献 相似文献 引证文献