莽山不同次生林土壤有机碳分布与土壤物理性质的相关性

发布时间：2018-06-18 04:36

  本文选题：次生林 + 土壤有机碳(SOC)　； 参考：《南方农业学报》2017年04期

【摘要】：【目的】探讨湖南莽山国家级自然保护区三类次生林土壤有机碳(SOC)分布特征与土壤物理性质的关系,为该地区森林土壤碳储量的准确计量及森林土壤固碳增汇提供参考依据。【方法】在海拔1230~1300 m区域内的杉木、粤松林和竹林内设9个固定标准地,采集不同层次土壤样品32个,测定其SOC、土壤容重及田间持水量,运用方差分析、相关分析及回归分析法研究不同植被类型SOC分布特征及其与土壤容重和田间持水量间的关系。【结果】杉、松、竹三类林地不同土层SOC含量存在显著差异(P0.05,下同),随土壤深度增加呈递减趋势;不同林分变化幅度差异不同,且各土层间的差异达显著水平。三类林地0~40 cm土层SOC存贮有机碳在整个土层所占比重不同,分别为77.7%、77.1%和85.9%。经回归分析发现,杉、松、竹三类林地SOC和土壤容重拟合值R分别为0.632、0.727和0.615,杉木林SOC含量与土壤容重呈极显著相关(P0.01,下同);三类林地SOC含量与田间持水率均呈极显著或显著正相关。方差分析结果表明,黏粒、粉粒、砂粒含量在同一土层中的三类林地间存在极显著差异;黏粒、粉粒、砂粒含量与SOC含量相关不显著(P0.05),而砂粒与黏粒、粉粒存在极显著负相关。杉、松、竹三类林地砂粒含量在土壤垂直剖面各层均高于黏粒、粉粒含量。【结论】莽山不同次生林SOC与土壤物理性质密切相关,土壤容重、田间持水量、土壤机械组成等物理性质可作为营林和增加森林土壤碳汇的参考指标。
[Abstract]:[objective] to study the relationship between soil organic carbon (SOC) distribution characteristics and soil physical properties in three types of secondary forest in Gansshan National Nature Reserve of Hunan Province. This paper provides a reference for the accurate measurement of forest soil carbon storage and the increase of forest soil carbon sequestration. [methods] A total of 32 soil samples of different levels were collected from 9 fixed standard plots of Chinese fir, Guangdong pine forest and bamboo forest in the area of 1230 ~ 1300m above sea level. SOC, soil bulk density and field water capacity were measured. The SOC distribution characteristics of different vegetation types and their relationship with soil bulk density and field water capacity were studied by means of variance analysis, correlation analysis and regression analysis. There was significant difference in SOC content in different soil layers of three types of woodlands (P 0.05, P 0.05), and the content of SOC decreased with the increase of soil depth, and the variation range of different stands was different, and the differences among different soil layers reached a significant level. The proportion of SOC stored in the soil layer of 0 ~ 40 cm in three types of woodland is different, which is 77.7% and 85.9%, respectively. By regression analysis, we found that the fir, pine, The fitting values of SOC and soil bulk density in three types of woodland were 0.6320.727 and 0.615, respectively. The SOC content of Chinese fir forest was significantly correlated with soil bulk density (P0.01), and the SOC content of three kinds of woodland was significantly or positively correlated with the field water holding rate. The results of variance analysis showed that the contents of clay, silt and sand were significantly different among the three types of woodland in the same soil layer, and the content of clay, silt and sand had no significant correlation with SOC content (P0.05N), while the content of sand was negatively correlated with clay and silt. The sand content in soil vertical profile was higher than that of clay in soil vertical profile. [conclusion] SOC of different secondary forest in mountain area was closely related to soil physical properties, soil bulk density and field water holding capacity. Physical properties such as soil mechanical composition can be used as a reference index for forest forestry and increasing forest soil carbon sinks.
【作者单位】： 中南林业科技大学经济林培育与保护省部共建教育部重点实验室;经济林育种与栽培国家林业局重点实验室;经济林培育与利用湖南省2011协同创新中心;
【基金】：科技部科技基础性工作专项项目(2014FY120700) 国家林业公益性行业专项项目(201104008)
【分类号】：S714.2
，

本文编号：2034112