摘要
探索土壤有机碳物理保护与化学保护的关系,有助于揭示土壤固碳和培肥机理,明确不同粒级团聚体和不同腐殖物质组分对土壤固碳和肥力的贡献。本研究对岩溶区自然植被土壤团聚体中腐殖质含量进行了研究,结果表明：（1）灌丛和林地土壤团聚体中有机碳含量总体上均表现为随着土层深度的增加逐渐下降,而在不同土层深度随着团聚体粒径范围的变化则有机碳含量的变化规律则不同,无明显一致的规律;（2）两种土地利用方式各粒径团聚体中胡敏酸和富里酸均比全土小。这可能是由于在湿筛分离团聚体的过程中溶于水的那部分胡敏酸和富里酸成分被损失掉;（3）各腐殖质组分随着团聚体粒径范围的减小在两种自然植被上均无明显一致的规律,但胡敏酸和富里酸总量则基本表现为随着团聚体粒径范围的减小而逐渐升高,即在〈0.25mm和0.5-0.25mm粒径范围团聚体中最大;（4）两种自然植被土壤各土层中和各团聚体中胡敏酸/富里酸（HA/FA）基本上表现为小于1,这主要是因为研究区温度相对较高,湿度较大,植被覆盖度大,微生物降解作用强所致。
To explore the relationship between physical protection and chemical protection on soil organic car bon is helpful to reveal the mechanism of soil carbon sequestration and fertility. It could also ascertain the contribution of different components of soil aggregates, humic substances in soil carbon sequestration and soil fertility. The content of humus in soil aggregate of natural vegetation inkarst area was studied. The re- suits showed that： （1） In general, the content of soil organic carbon decreased with the increase of soil depth, and the variation of organic carbon content is different at soil depths with variation of aggregate size. （2） The contents of humic and fulvic acids in the soil aggregates are lower than that in mass soil. This may be because the soluble components of humicand fulvic acids get lost in sieving aggregates. （3） The decrease of humus content along with the soil aggregate size in the two types of natural vegetation not obvious. How- ever the total content of humic and fulvic acids gradually increase along with the decrease of soil aggregate size, that is, the maximum content of humus is in those soils with aggregate size of less than 0.25mm. （4） HA/FA is less than 1 in both the mass soil and the aggregate of two kinds of natural vegetation, which is mainly because of the relatively high temperature, high humidity, thick vegetation coverage, strong microbi- al degradation of the study area.
出处
《中国岩溶》
CAS
CSCD
北大核心
2016年第1期19-26,共8页
Carsologica Sinica
基金
国家自然科学基金(青年基金项目
41402326)
广西自然科学基金(青年基金项目
2013GXNSFBA019217)
广西科学研究与技术开发计划项目(桂科能1598023-1
桂科合14125008-2-1)
中国地质调查项目(12120113005300)
关键词
岩溶区
土壤团聚体
腐殖质
有机碳
自然植被
karst area, soil aggregate, humus, soil organic carbon, natural vegetation
