| 陇东黄土高原农田土壤微生物量碳和颗粒有机碳剖面分布特征 |
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| 引用本文： | 李玉进1,王百群1,2,3,丁婷婷2. 陇东黄土高原农田土壤微生物量碳和颗粒有机碳剖面分布特征[J]. 水土保持研究, 2013, 20(6): 1-5 |
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| 作者姓名： | 李玉进1 王百群1 2 3 丁婷婷2 |
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| 作者单位： | 1. 西北农林科技大学 水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100;2. 西北农林科技大学 资源环境学院, 陕西 杨凌 712100;3. 中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100 |
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| 摘 要： | 采用野外调查采样与室内分析相结合的方法，对陇东黄土高原农田黑垆土微生物量碳（MBC）和颗粒有机碳（POC）的剖面分布特征进行了研究。结果表明:不同剖面土壤微生物量碳和颗粒有机碳含量随土层变化差异显著或极显著，主要集中在0—20 cm和20—40 cm土层，呈明显的表聚现象；0—60 cm土层MBC含量随着土层深度增加而减小；随着海拔高度增加，0—20 cm土层MBC含量整体呈增加趋势，变化范围为180.92～282.53 mg/kg；POC含量在0—20 cm和20—40 cm土层的变化范围分别为1.02～1.68 g/kg和0.25～0.96 g/kg，40 cm以下土层颗粒有机碳含量较低；剖面中不同土层深度微生物量碳、颗粒有机碳占总有机碳（SOC）的比例在 0—20 cm和20—40 cm土层均显著或极显著高于其它土层，MBC/SOC变化范围分别为2.29%～3.70%和1.00%～2.11%，POC/SOC的变化范围分别为13.46%～19.13%和5.08%～16.16%，剖面MBC/SOC与MBC、POC/SOC与POC随土层的变化规律均一致，MBC/SOC和POC/SOC可以作为反映土壤剖面质量变化的指标。
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| 关 键 词： | 黄土高原 黑垆土 微生物量碳 颗粒有机碳 分布特征 |
Profile Distribution Characteristics of Microbial Biomass Carbon and Particulate Organic Carbon of Farmland Soil in East Gansu Province of Loess Plateau |
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| LI Yu-jin1,WANG Bai-qun1,2,3,DING Ting-ting2. Profile Distribution Characteristics of Microbial Biomass Carbon and Particulate Organic Carbon of Farmland Soil in East Gansu Province of Loess Plateau[J]. Research of Soil and Water Conservation, 2013, 20(6): 1-5 |
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| Authors: | LI Yu-jin1 WANG Bai-qun1 2 3 DING Ting-ting2 |
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| Affiliation: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;2. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: | Combining field sampling with laboratory analysis, we studied the soil profile distribution of microbial biomass carbon (MBC) and particulate organic carbon (POC) of dark loessial soil in farmland in East Gansu Province of Loess Plateau. The results showed that the contents of MBC and contents of POC were significantly different with the soil layer changes， which mainly distributed in 0—20 cm and 20—40 cm soil layers, mostly distributed in the top soil layer. The contents of MBC decreased with the soil depth increase in 0—60 cm soil layer. With the altitude increase, the contents of MBC had the relative increase tendency in 0—20 cm soil layer with the range of 180.92～282.53 mg/kg. The contents of POC were in the range of 1.02～1.68 g/kg and 0.25～0.96 g/kg in the of 0—20 cm and 20—40 cm soil layers, respectively, which were lower below 40 cm soil layer than those in the upper layers; with respect to the proportion MBC and POC to soil organic carbon(SOC), the percentages of MBC/SOC and POC/SOC in the 0—20 cm and 20—40 cm soil layesr were significantly higher than the others, MBC/SOC varied from 2.29% to 3.70% and 1.00% to 2.11%, respectively, POC/SOC varied from 13.46%～19.13% and 5.08%～16.16% in these two layers, respectively. With the soil layer increase, the trends of MBC/SOC and POC/SOC were consistent with that of MBC and POC. MBC/SOC and POC/SOC can be served as indexes to reflect the soil quality changes along profile. |
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| Keywords: | Loess Plateau dark loessial soil microbial biomass carbon particulate organic carbon distribution characteristics |
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