| 王 星1，段建军2，王小利1，徐 虎1，王桂红1，郭 振1，王萍萍1.喀斯特小流域不同土地利用方式土壤活性碳组分的变化特征[J].广东农业科学,2017,44(1):88-93 |
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喀斯特小流域不同土地利用方式土壤活性碳组分的变化特征 |
| Changes of soil active organic carbon pool under difierent land use types in Karst Mountain Area |
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| DOI：10.16768/j.issn.1004-874X.2017.01.013 |
| 中文关键词: 喀斯特小流域 土地利用方式 有机碳活性组分 活性有机碳分配比例 |
| 英文关键词: karst area land use patterns organic carbon active components proportion of active organic
carbon |
| 基金项目:国家自然科学基金（41361064） |
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| 摘要点击次数: 2470 |
| 全文下载次数: 1046 |
| 中文摘要: |
| 以贵州普定县陈家寨小流域为对象，探讨5 种不同土地利用方式0～20 cm 土层各活性有机碳
组分的差异特征及其与土壤总有机碳间的关系。结果表明：贵州陈家寨喀斯特小流域0～20 cm 土层土壤总
有机碳含量为42.03（±25.08） g/kg，其中灌木林地有机碳含量最高为77.44（±28.38） g/kg，是耕地有机碳
含量的3.5 倍；土壤水溶性有机碳的含量表现为灌木林地> 荒草地> 人工林> 果园> 耕地，游离活性有机
碳的含量表现为灌木林地> 人工林> 荒草地> 果园> 耕地，易氧化有机碳的含量表现为灌木林地> 人工
林> 荒草地> 耕地> 果园；土壤总有机碳含量与各活性碳组分间均有显著相关关系，其中与游离活性有机
碳的相关系数最高。不同土地利用方式下土壤有机碳含量不同，各活性有机碳组分既有相同之处，又存在
差异，说明土壤活性有机碳的复杂性，因此不同活性有机碳的表征指标无论数值还是变化趋势不能直接比
较。 |
| 英文摘要: |
| The differences of active organic carbon fractions in 0-20 cm soil layers and their relationships with
soil total organic carbon（ SOC） were studied in the karst small watershed of Chenjiazhai，Puding county，Guizhou
province，under different land use patterns. The results showed that the average content of total organic carbon in 0-20
cm soil layer of Chenjiazhai karst watershed in Guizhou was 42.03（± 25.08）g/kg. The organic carbon content of
shrub land was the highest（ 77.44 ± 28.38 g/kg），which was 3.5 times of that of cultivated land. The content of soil
water-soluble organic carbon in descending order was as follows: bushes> grassland> plantation> orchard> arable
land. The content of free active organic carbon in descending order was as follows: bushes> plantation> grassland>
arable land> orchard. The content of easily oxidized organic carbon in descending order were as follows: bushes>
plantation>grassland>arable land > orchard. There was a significant correlation between total soil organic carbon
（SOC） content and active carbon components，and the correlation coefficient between free organic carbon and free organic carbon was the highest. The content of soil organic carbon was different under different land use patterns，
and the contents of active organic carbon were similar and different，which indicated the complexity of soil active
organic carbon. Therefore，the characterization index of different active organic carbon can not be directly compared
regardless of the value or the trend of change. |
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