Local-Scale Spatial Variability of Soil Organic Carbon and its Stock in the Hilly Area of the Loess Plateau, China
Local-Scale Spatial Variability of Soil Organic Carbon and its Stock in the Hilly Area of the Loess Plateau, China
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DOI：
10.1016/j.yqres.2008.11.006
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发表时间：
2010-01
影响因子：
2.3
通讯作者：
Yafeng Wang;B. Fu;Y. Lü;Chengjun Song;Yong Luan
中科院分区：
文献类型：
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作者：
Yafeng Wang;B. Fu;Y. Lü;Chengjun Song;Yong Luan
土壤有机碳（SOC）是评价土壤质量的重要指标之一。同时，碳储量的变化可能对全球气候产生较大的潜在影响。对土壤有机碳储量的准确估计及其变化规律的研究变得越来越重要。本研究以杨泉沟流域为研究对象，研究了不同土地利用方式下土壤有机碳的分布。土壤有机碳浓度随土壤深度的增加而降低，且在垂直剖面上存在显著差异（P < 0.01）。然而，考虑到土地利用对有机碳的影响，仅在表层土壤（0 ~ 5 cm）层显著（P < 0.01）。这表明土地利用对表层土壤有机碳储量有较大影响。土壤有机碳分层比bbb1.2可能表明土壤质量正在改善。不同土地利用方式下土壤有机碳密度（0 ~ 30 cm）大小顺序为林地b>果园>草地>未成熟林地>梯田。该流域有机碳储量高达2.67 × 10 t （0-30 cm）。考虑恢复的时间效应，在半干旱黄土丘陵区，刚退耕的坡耕地比造林的坡耕地更有利于有机碳的积累。
Soil organic carbon (SOC) is one of the key components for assessing soil quality. Meanwhile, the changes in the stocks SOC may have large potential impact on global climate. It is increasingly important to estimate the SOC stock precisely and to investigate its variability. In this study, Yangjuangou watershed was selected to investigate the SOC distribution under different land uses. We found that SOC concentration decreased with increasing soil depth under all land uses and was significantly different across the vertical soil profile (P < 0.01). However, considering effect of land use on SOC, it is only significant (P < 0.01) in the topsoil (0–5 cm) layer. This indicated that land use has a large effect on the stocks of SOC in the surface soil. The stratification ratio of SOC > 1.2 may mean that soil quality is improving. The order of the SOC density (0–30 cm) under different land uses is forestland > orchard land > grassland > immature forestland > terraced cropland. The SOC stock is found to be as large as 2.67 × 10 t (0–30 cm) in this watershed. Considering time effect of restoration, the slope cropland just abandoned is more efficient for SOC accumulation than trees planted in the semi-arid hilly loess area.