Impact of land use change on profile distributions of soil organic carbon fractions in the Yanqi Basin
Impact of land use change on profile distributions of soil organic carbon fractions in the Yanqi Basin
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DOI：
10.1016/j.catena.2013.11.019
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发表时间：
2014-04
期刊：
影响因子：
6.2
通讯作者：
Juan Zhang;Xiujun Wang;Jiaping Wang
中科院分区：
文献类型：
--
作者：
Juan Zhang;Xiujun Wang;Jiaping Wang
土地利用变化是土壤有机碳动态变化的重要驱动力之一。在过去的几十年里，中国干旱地区经历了重大的土地利用变化。研究了焉耆盆地土地利用变化对土壤有机碳组分的影响。从24个剖面采集了农田和自然土地土壤样品，并测定了活性、半活性和半活性有机碳。土壤有机碳各组分在0-100 cm土层内均表现出逐渐减少的趋势。农田土壤有机碳组分在0-30 cm和30-100 cm的分布较为均匀。平均而言，农田中0-30 cm（30-100 cm）的不稳定、半不稳定和不稳定碳含量分别为2.2 ± 0.3（1.3 ± 0.4）、1.5 ± 0.4（0.7 ± 0.3）和8.5 ± 2.0（3.1 ± 1.8）g kg− 1。将原生土地转换为农田导致0-30 cm范围内的半不稳定碳（2.0 kg m− 2）、半不稳定碳（0.3 kg m− 2）和不稳定碳（0.3 kg m− 2）显著增加。土壤有机碳储量的比例由原土地的59.9%增加到农田的64.8%。这项研究表明，在干旱地区，退耕还林不仅提高了土壤有机碳储量，而且还导致长期的土壤有机碳储量。
Land use change is recognized as one important driving force for soil organic carbon (SOC) dynamics. The arid regions in China have experienced significant land use changes over the past decades. A study was carried out to evaluate the impacts of land use change on SOC fractions in the Yanqi Basin, northwest China. Soil samples were collected from 24 profiles in cropland and native land, and labile, semi-labile, and recalcitrant organic carbon were measured. All SOC fractions showed a gradual decrease with depth over the 0–100 cm in the native land. However, SOC fractions in the cropland revealed uniform distributions over the 0–30 cm and 30–100 cm. On average, labile, semi-labile, and recalcitrant carbon contents in the cropland were 2.2 ± 0.3 (1.3 ± 0.4), 1.5 ± 0.4 (0.7 ± 0.3), and 8.5 ± 2.0 (3.1 ± 1.8) g kg− 1over the 0–30 cm (30–100 cm), respectively. Converting native land to cropland resulted in significant increases of recalcitrant (2.0 kg m− 2), semi-labile (0.3 kg m− 2), and labile carbon (0.3 kg m− 2) over the 0–30 cm. The proportion of recalcitrant SOC stock increased from 59.9% in the native land to 64.8% in the cropland. This study suggests that converting native land to cropland in arid region not only enhances SOC stocks but also leads to longer-term SOC storage.