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首页> 外文期刊>Land Degradation and Development >VARIATIONS OF SOIL ORGANIC CARBON FOLLOWING LAND USE CHANGE ON DEEP-LOESS HILLSOPES IN CHINA
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VARIATIONS OF SOIL ORGANIC CARBON FOLLOWING LAND USE CHANGE ON DEEP-LOESS HILLSOPES IN CHINA

机译：土地利用变化在中国深土山坡后土壤有机碳的变化

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Land use change is a key factor driving changes in soil organic carbon (SOC) around the world. However, the changes in SOC following land use changes have not been fully elucidated, especially for deep soils (>100 cm). Thus, we investigated the variations of SOC under different land uses (cropland, jujube orchard, 7-year-old grassland and 30-year-old grassland) on hillslopes in the Yuanzegou watershed of the Loess Plateau in China based on soil datasets related to soils within the 0-100cm. Furthermore, we quantified the contribution of deep-layer SOC (200-1,800 cm) to that of whole soil profiles based on soil datasets within the 0-1,800 cm. The results showed that in shallow profiles (0-100 cm), land uses significantly (p 0.05) influenced the distribution of SOC contents and stocks in surface layer (0-20 cm) but not subsurface layers (20-100 cm). Pearson correlation analysis indicated that soil texture fractions and total N were significantly (p 0.05 or 0.01) correlated with SOC content, which may have masked effects of land use change on SOC. In deep profiles (0-1,800 cm), SOC stock generally decreased with soil depth. But deep soils showed high SOC sequestration capacity. The SOC accumulated in the 100-1,800 m equalled 90.6%, 91.6%, 87.5% and 88.6% of amounts in the top 100 cm under cropland, 7-year-old grassland, 30-year-old grassland and jujube orchard, respectively. The results provide insights into SOC dynamics following land use changes and stressed the importance of deep-layer SOC in estimating SOC inventory in deep loess soils. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译：土地利用变化是世界各地土壤有机碳（SOC）的关键因素推动变化。然而，土地使用变化的SOC的变化尚未完全阐明，特别是对于深土壤（> 100厘米）。因此，我们根据与中国土地数据集在中国的黄土高原的袁宗口流域的丘陵流域上的丘陵地区调查了SOC的变化土壤在0-100cm内。此外，我们将深层SoC（200-1,800cm）的贡献量为基于0-1,800厘米的土壤数据集的整个土壤剖面的贡献。结果表明，在浅轮廓（0-100cm）中，土地使用显着（P <0.05），影响了SOC含量和表面层中的股票（0-20厘米）的分布（0-20cm）（20-100cm） 。 Pearson相关性分析表明，土壤纹理分数和总N显着（p＆ 0.05或0.01）与SoC含量相关，这可能对SoC的土地利用变化的掩蔽作用。在深层型材（0-1,800厘米）中，SoC库存通常随着土壤深度而降低。但深土壤显示出高的SOC隔离能力。在100-1,800米累计的SOC分别在100-1,800米中累积的90.6％，91.6％，91.6％，87.5％和88.6％和88.6％，分别为10厘米，7岁的草原，30岁的草原和枣果园。结果为土地利用变化后的SoC动态提供了深入了解，并强调了深层SOC在深黄土中估算SOC库存的重要性。版权所有（c）2017年John Wiley＆amp; SONS，LTD.

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