| 秦嘉海，张 勇，赵芸晨，王治江，高海宁，赵 静.黑河上游冰沟流域4种土壤有机碳分布特征与土壤特性的关系[J].干旱地区农业研究,2013,31(5):200~206 |
| 黑河上游冰沟流域4种土壤有机碳分布特征与土壤特性的关系 |
| Characteristics of organic carbon and soil properties in Binggou valley at upstream of Heihe river |
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| DOI：10.7606/j.issn.1000-7601.2013.05.034 |
| 中文关键词: 黑河上游 冰沟流域 土壤 有机碳 土壤特性 |
| 英文关键词:upstream of Heihe River Binggou Valley soil organic carbon (SOC) soil properties |
| 基金项目:国家自然科学基金重点支持项目“黑河流域生态水分样带调查”（91025002/D010106） |
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| 中文摘要: |
| 为了探讨黑河上游冰沟流域不同土壤有机碳分布特征与土壤特性的关系，为黑河上游冰沟流域水源涵养研究提供科学依据，采用野外采样，室内分析方法，研究了4种土壤有机碳分布特征及其与土壤特性的关系。结果表明：4种土壤有机碳含量和密度在整个土壤剖面上均表现为：森林灰褐土>高山灌丛草甸土>高山草甸土>山地栗钙土，且垂直分布均随土壤深度增加而减少，说明黑河上游冰沟流域的森林灰褐土比其它土壤更有利于土壤有机碳储存和积累。森林灰褐土0～10 cm土壤有机碳密度为4.54 kg·m-2，略高于我国森林土壤0～10 cm土壤平均碳密度（4.24 kg·m-2）,说明黑河上游冰沟流域的森林灰褐土区雨量充沛，林下植被丰富，凋落物现存量充足。4种土壤0～10 cm土层有机碳含量是整个土壤剖面土壤有机碳含量的30.69%～37.99%，有机碳密度是整个土壤剖面有机碳密度的29.31%～36.77%，说明黑河上游冰沟流域土壤有机碳含量和有机碳密度在表层具有很强的表聚性，不合理的人为活动引发的水土流失极易造成土壤有机碳储量的减少，应增加黑河上游冰沟流域植被覆盖度，保护生态环境，减少水土流失。4种土壤有机碳、全氮、CEC、田间持水量、团聚体在整个土壤剖面上均随土层深度增加而降低，而土壤容重、pH值在整个土壤剖面上均随土层深度增加而增大。经回归统计分析，4种土壤有机碳含量与土壤田间持水量、团聚体、全氮、CEC之间呈显著的正相关关系，与土壤容重、pH之间呈显著的负相关关系。这种变化规律与多数学者研究结果基本一致。 |
| 英文摘要: |
| Based on the method of field sampling and laboratory analysis, the relationship between distribution of organic carbon and soil properties was investigated for four kinds of soil in Binggou Valley at the upstream of Heihe River, so as to provide a scientific basis for local water conservation. The results showed that the content and density of organic carbon in whole profile of the four tested soils were consistently ordered as: gray brown forest soil＞alpine scrub meadow soil＞alpine meadow soil＞mountain chestnut soil, and they decreased with the increase of soil depth, which indicated that the gray brown forest soil was more beneficial to the storage and accumulation of organic carbon than other soils in Binggou Valley. The density of organic carbon in 0～10 cm depth of gray brown forest soil was 4.54 kg·m-2, being slightly higher than the average value (4.24 kg·m-2) in 0～10 cm depth of forest soil in China, which indicated that there was a relatively abundant litter biomass in the gray brown forest soil in Binggou Valley because of the plentiful rainfall and the good understory vegetation. The organic carbon content in 0～10 cm of the four soils was 30.69%～37.99% of total organic carbon content in the whole soil profile, and the organic carbon density in 0～10 cm was 29.31%～36.77% of total organic carbon density in the whole soil profile, which illustrated that the soil organic carbon was largely concentrated in the surface soil in Bingg
ou Valley, and its storage capacity was easily lowered by unreasonable human activities as a result of soil and water erosion. Therefore, the vegetation coverage should be improved so as to protect the ecological environment and to reduce soil and water erosion in this region. With the increase of depth in profile of the four soils, the organic carbon content, total N content, CEC, field water capacity and aggregate percentage tended to decrease, while the soil bulk density and pH tended to rise. The regression statistical analysis showed the organic carbon content in the four soils was positively correlated with field water capacity, aggregate percentage, total N content and CEC, but was negatively correlated with soil bulk density and pH, being basically consistent with the results of many researchers. |
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