摘要
通过室内模拟实验,利用δ13C方法研究外源新碳(13C标记的水稻秸秆)在不同类型土壤(红壤、黄红壤和草甸土)团聚体中的分配规律。培养温度为25°C,培养时间为360 d。结果表明:在三种类型土壤中,外源新碳进入到土壤团聚体中的数量由大到小顺序依次为250~2 000μm、50~250μm和<50μm。而进入到土壤中的外源新碳,56.8%~59.6%残留在250~2 000μm团聚体中,25.9%~28.7%残留在50~250μm团聚体中,11.7%~17.3%残留在<50μm团聚体中,表明新进入的外源碳主要分配在大团聚体中。
Using the stable carbon isotope (δ^13C) technique, an indoor incubation experiment was carried out to study distribution of fresh carbon in soil aggregate fractions of red soil (Ferrisols) , yellowish red soil (Luvisol) and mountain meadow soil (Cambisols). To trace dynamics of fresh carbon in soil aggregates δ^13C-labelled rice straw was applied to the soils, which were then put under incubation at 25℃ for 360 days. Results show that the quantity of the fresh carbon found in soil aggregates followed a decreasing order of 250 - 2 000 μm 〉 50 - 250 μm 〉 〈 50 μm in all these soils, accounting for 56.8% - 59.6% , 25.9% - 28.7% and 11.7% - 17.3% , respectively, of the total applied into the soil, which further indicates that the added fresh carbon was mainly accumulated in large-sized soil aggregates.
出处
《土壤学报》
CAS
CSCD
北大核心
2013年第3期534-539,共6页
Acta Pedologica Sinica
基金
国家自然科学基金项目(40801087
31070549)
福建省自然科学基金项目(2010J01248)资助
关键词
新碳
δ13C
土壤类型
团聚体
Fresh carbon
δ^13C
Soil type
Soil aggregates