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首页> 外文期刊>Soil Research >Assessing carbon lability of particulate organic matter from delta C-13 changes following land-use change from C-3 native vegetation to C-4 pasture
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Assessing carbon lability of particulate organic matter from delta C-13 changes following land-use change from C-3 native vegetation to C-4 pasture

机译：评估土地用途从C-3原生植被转变为C-4牧场后，三角洲C-13的颗粒有机物的碳变化

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摘要

Land-use change from C-3 vegetation (delta C-13 values, -30% to -24%) to C-4 vegetation (delta C-13 values, -14% to -11%) provides a useful quantitative technique for estimating organic C turnover in soil, even when total organic C changes are negligible. We utilised this technique to estimate C turnover in physically fractionated soil organic matter, particulate organic matter C (POM C >250 mu m fraction and POM C 250-53 mu m fraction), and the <53 mu m fraction. There were small changes in total soil organic C (SOC) after 23 years of land-use change from native vegetation (mixed vegetation of Acacia harpophylla and Casuarina cristata) to buffel grass (Cenchrus ciliaris L. cv. Biloela) pasture grown on Vertosol-Dermosol-Sodosol soil types. The SOC values (t/ha) under native vegetation were: 31 +/- 3 for the 0-0.1m depth, 21 +/- 1 for the 0.1-0.2m depth, 15 +/- 3 for the 0.2-0.3m depth, and 16 +/- 2 for the 0.3-0.4m depth; the corresponding SOC values under pasture were 25 +/- 2, 19 +/- 2, 14 +/- 2, and 13 +/- 1 t/ha. The respective delta C-13 values in 0-0.1m depths of the whole SOC and POM C >250 mm fraction changed from -25.5 +/- 0.1% and -25.5 +/- 0.3% under native vegetation to -20.1 +/- 0.5% and -19.4 +/- 0.2% under pasture. Similar, although smaller, differences were observed for other depths and SOC fractions. The SOC turnover periods (years) were 31 +/- 6 for the 0-0.1m depth, 60 +/- 5 for the 0.1-0.2m depth, 55 +/- 15 for the 0.2-0.3m depth, and 63 +/- 20 for the 0.3-0.4m depth; the corresponding turnover periods for the POM C >250 mu m fraction were 13 +/- 2, 19 +/- 5, 14 +/- 4, and 12 +/- 5 years. The turnover periods of SOC in the POM C 250-53 mu m and <53 mu m fractions were similar to, or longer than, for the whole SOC at all depths studied. Thus, the lability of the SOC and SOC pools was in the order: POM C >250 mu m fraction > POM C 53-250 mu m fraction = POM C <53 mu m fraction = whole SOC.
机译：从C-3植被（三角洲C-13值，-30％至-24％）到C-4植被（三角洲C-13值，-14％至-11％）的土地利用变化为以下方面提供了有用的定量技术：估算土壤中有机碳的转化率，即使总有机碳变化可忽略不计。我们利用该技术估算了物理分级土壤有机物，颗粒有机物碳（POM C> 250μm馏分和POM C 250-53μm馏分）和<53μm馏分的碳转化率。从Vertosol-上种植的23年土地利用变化（从天然植被（长相思和木麻黄的混合植被）到水草（Cenchrus ciliaris L. cv。Biloela）的土地利用变化后，土壤总有机碳（SOC）有微小变化。 Dermosol-Sodosol土壤类型。天然植被下的SOC值（t / ha）为：0-0.1m深度为31 +/- 3，0.1-0.2m深度为21 +/- 1，0.2-0.3m为15 +/- 3深度，对于0.3-0.4m深度为16 +/- 2;牧草的相应SOC值为25 +/- 2、19 +/- 2、14 +/- 2和13 +/- 1 t / ha。整个SOC和POM C> 250 mm分数在0-0.1m深度处的相应C-13值从天然植被下的-25.5 +/- 0.1％和-25.5 +/- 0.3％更改为-20.1 +/-牧场下分别为0.5％和-19.4 +/- 0.2％。相似但较小，但在其他深度和SOC分数上观察到差异。 SOC转换周期（年）对于0-0.1m深度为31 +/- 6，对于0.1-0.2m深度为60 +/- 5，对于0.2-0.3m深度为55 +/- 15，以及63 + /-深度为0.3-0.4m时为20; POM C> 250μm馏分的相应周转期为13 +/- 2、19 +/- 5、14 +/- 4和12 +/- 5年。在研究的所有深度下，POM C 250-53μm和<53μm馏分中SOC的周转期与整个SOC相似或更长。因此，SOC和SOC池的不稳定程度依次为：POM C> 250μm分数> POM C 53-250μm分数= POM C <53μm分数=整个SOC。

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