红壤缓坡地径流与土壤可蚀性对土壤有机碳流失的影响
探明坡面径流和土壤可蚀性对土壤有机碳流失的影响,对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30~100 mm/h）和耕作条件下（翻耕和免耕）土壤有机碳流失过程及其与坡面径流和土壤可蚀性的关系。结果表明,坡面产流过程对泥沙态有机碳流失过程具有明显影响,除大雨强条件下泥沙态有机碳流失速率在10~30 min呈现短时间峰值外,各径流小区泥沙态有机碳流失过程与坡面产流过程总体变化趋势基本一致,均表现为产流开始后,其流失率随降雨历时延长而增加,而后逐步趋于平稳,但坡面产流过程对径流有机碳流失过程无明显影响;坡面径流率大小影响土壤有机碳流失,坡面径流率变化...
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| Published in | 农业工程学报 Vol. 31; no. 19; pp. 135 - 141 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
湖南大学环境生物与控制教育部重点实验室，长沙 410082
2015
西南民族大学旅游与历史文化学院，成都 610041 湖南大学环境科学与工程学院，长沙 410082 湖南大学环境生物与控制教育部重点实验室，长沙 410082%湖南大学环境科学与工程学院，长沙 410082 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.2015.19.019 |
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| Abstract | 探明坡面径流和土壤可蚀性对土壤有机碳流失的影响,对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30~100 mm/h）和耕作条件下（翻耕和免耕）土壤有机碳流失过程及其与坡面径流和土壤可蚀性的关系。结果表明,坡面产流过程对泥沙态有机碳流失过程具有明显影响,除大雨强条件下泥沙态有机碳流失速率在10~30 min呈现短时间峰值外,各径流小区泥沙态有机碳流失过程与坡面产流过程总体变化趋势基本一致,均表现为产流开始后,其流失率随降雨历时延长而增加,而后逐步趋于平稳,但坡面产流过程对径流有机碳流失过程无明显影响;坡面径流率大小影响土壤有机碳流失,坡面径流率变化能解释80%土壤有机碳流失的变化,坡面径流率与土壤有机碳流失呈线性正相关关系,且坡面径流率对泥沙态有机碳流失的影响比其对径流有机碳流失的影响更明显;土壤可蚀性对土壤有机碳流失的影响是非线性的,且土壤可蚀性指标越大,土壤有机碳流失率越大,但土壤可蚀性对土壤有机碳流失的影响存在有限性。坡面径流和土壤可蚀性是土壤有机碳流失的重要影响因素。 |
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| AbstractList | 探明坡面径流和土壤可蚀性对土壤有机碳流失的影响,对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30~100 mm/h）和耕作条件下（翻耕和免耕）土壤有机碳流失过程及其与坡面径流和土壤可蚀性的关系。结果表明,坡面产流过程对泥沙态有机碳流失过程具有明显影响,除大雨强条件下泥沙态有机碳流失速率在10~30 min呈现短时间峰值外,各径流小区泥沙态有机碳流失过程与坡面产流过程总体变化趋势基本一致,均表现为产流开始后,其流失率随降雨历时延长而增加,而后逐步趋于平稳,但坡面产流过程对径流有机碳流失过程无明显影响;坡面径流率大小影响土壤有机碳流失,坡面径流率变化能解释80%土壤有机碳流失的变化,坡面径流率与土壤有机碳流失呈线性正相关关系,且坡面径流率对泥沙态有机碳流失的影响比其对径流有机碳流失的影响更明显;土壤可蚀性对土壤有机碳流失的影响是非线性的,且土壤可蚀性指标越大,土壤有机碳流失率越大,但土壤可蚀性对土壤有机碳流失的影响存在有限性。坡面径流和土壤可蚀性是土壤有机碳流失的重要影响因素。 S157.1; 探明坡面径流和土壤可蚀性对土壤有机碳流失的影响，对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30～100 mm/h）和耕作条件下（翻耕和免耕）土壤有机碳流失过程及其与坡面径流和土壤可蚀性的关系。结果表明，坡面产流过程对泥沙态有机碳流失过程具有明显影响，除大雨强条件下泥沙态有机碳流失速率在10～30 min呈现短时间峰值外，各径流小区泥沙态有机碳流失过程与坡面产流过程总体变化趋势基本一致，均表现为产流开始后，其流失率随降雨历时延长而增加，而后逐步趋于平稳，但坡面产流过程对径流有机碳流失过程无明显影响；坡面径流率大小影响土壤有机碳流失，坡面径流率变化能解释80%土壤有机碳流失的变化，坡面径流率与土壤有机碳流失呈线性正相关关系，且坡面径流率对泥沙态有机碳流失的影响比其对径流有机碳流失的影响更明显；土壤可蚀性对土壤有机碳流失的影响是非线性的，且土壤可蚀性指标越大，土壤有机碳流失率越大，但土壤可蚀性对土壤有机碳流失的影响存在有限性。坡面径流和土壤可蚀性是土壤有机碳流失的重要影响因素。 |
| Abstract_FL | Clarifying soil organic carbon (SOC) loss plays a vital role in studying SOC sequestration and regional C cycling. In order to investigate effects of overland flow and soil erodibility on SOC loss, field simulated rainfall experiments were conducted at Soil and Water Conservation monitoring station (111°22′ E, 27°03′ N) located in the Shuangqing district in Shaoyang City of Hunan Province, in the hilly red soil region of southern China. Rainfall events were performed in 2012 on 4 chisel tillage plots with rainfall intensities of 100, 80, 40 and 30 mm/h (CT-1, CT-2, CT-3 and CT-4) and 2 no tillage plots with rainfall intensities of 80 and 30 mm/h (NT-1 and NT-2), respectively. Field plots (5 m length × 2 m width) were designed at a sloping land with a slope of 10°, and all the rainfall events lasted 60 min since the runoff began. Runoff and sediment samples were collected every 6 min for measuring runoff volume, sediment weight, and concentration of runoff-dissolved organic C and sediment-bound organic C. The results showed that sediment exports averaged 2.400, 1.400, 0.960, 0.290, 0.200 and 0.014 g/(m2·s); Sediment-bound organic C exports averaged 0.009, 0.007, 0.010, 0.002, 0.003 and 0.0001 g/(m2·s) in CT-1, CT-2, NT-1, CT-3, NT-2, and CT-4, respectively. The sediment and associated SOC loss in high-intensity rainfall events were significantly (P<0.05) higher compared to low rainfall intensity events, coinciding with changes in runoff. However, runoff-dissolved organic C loss rate presented the higher values in CT-1, CT-2, and CT-3 than the other plots, different from change in runoff rate. Runoff rate of all the plots increased first and then within 12 min. The sediment loss rate of CT-1, CT-2, and NT-1 firstly increased and then decreased within 30 min, subsequently kept a stable value with rainfall duration; The sediment loss rate of CT-3, CT-4, and NT-2 was steady during the rainfall event. Sediment-bound organic C loss rate of CT-1, CT-2, and CT-3 sharply increased and then decreased within 30 min, subsequently stayed a stable value with rainfall duration; The change of sediment–bound organic C loss rate in CT-3, CT-4, and NT-2 was relatively steady. Runoff-dissolved organic C loss rate of CT-1 appeared two peak value at 25 min and 45 min, respectively, and both CT-2 and CT-3 appeared the peak value at 30 min. Runoff-dissolved organic C loss rate of NT-1, and NT-2 kept a stable value within 35 min and then appeared the peak value at 45 min, while runoff-dissolved organic C loss rate of CT-3 was steady during the whole rainfall event. This indicated that the loss process of sediment-dissolved organic C was similar to that of runoff except for the peak values appeared during 10-30 min in high-intensity rainfalls, and the sediment-bound organic C loss rate firstly increased and subsequently kept a relatively stable value. The results above demonstrated the magnitude of runoff affected SOC loss; Loss process of runoff had an obvious effect on that of sediment-bound organic C, but was not highly correlated with that of runoff-dissolved organic C. A positive linear relationship between SOC loss rate and runoff rate was shown. The regression analysis reveals variability of runoff could explain 80% of the variance in SOC loss, and runoff rate had a larger effect on sediment-bound organic C than runoff-dissolved organic C. In addition, the results showed that the soil erodibility had a nonlinear effect on SOC loss. Greater soil erodibility indicator could result in higher SOC loss rate, but the growth rate of SOC loss gradually decreased with the increase of soil erodibility indicator, which indicated the effect of soil erodibilty on SOC loss was limited. These observations led to the conclusion that runoff and soil erodibility were two significant impact factors of SOC loss. |
| Author | 陆银梅 李忠武 聂小东 黄斌 马文明 肖海兵 |
| AuthorAffiliation | 湖南大学环境科学与工程学院,长沙410082 湖南大学环境生物与控制教育部重点实验室,长沙410082 西南民族大学旅游与历史文化学院,成都610041 |
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| Author_FL | Li Zhongwu Huang Bin Ma Wenming Nie Xiaodong Lu Yinmei Xiao Haibing |
| Author_FL_xml | – sequence: 1 fullname: Lu Yinmei – sequence: 2 fullname: Li Zhongwu – sequence: 3 fullname: Nie Xiaodong – sequence: 4 fullname: Huang Bin – sequence: 5 fullname: Ma Wenming – sequence: 6 fullname: Xiao Haibing |
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| Keywords | erodibility 径流 sediment-bound runoff 坡面 泥沙态 soils slope 有机碳 可蚀性 organic carbon 土壤 |
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| Notes | 11-2047/S runoff; soils; organic carbon; slope; erodibility; sediment-bound Clarifying soil organic carbon（SOC） loss plays a vital role in studying SOC sequestration and regional C cycling. In order to investigate effects of overland flow and soil erodibility on SOC loss, field simulated rainfall experiments were conducted at Soil and Water Conservation monitoring station（111°22′ E, 27°03′ N） located in the Shuangqing district in Shaoyang City of Hunan Province, in the hilly red soil region of southern China. Rainfall events were performed in 2012 on 4 chisel tillage plots with rainfall intensities of 100, 80, 40 and 30 mm/h（CT-1, CT-2, CT-3 and CT-4） and 2 no tillage plots with rainfall intensities of 80 and 30 mm/h（NT-1 and NT-2）, respectively. Field plots（5 m length × 2 m width） were designed at a sloping land with a slope of 10°, and all the rainfall events lasted 60 min since the runoff began. Runoff and sediment samples were collected every 6 min for measuring runoff volume, sediment weight, and concentra |
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| Publisher | 湖南大学环境生物与控制教育部重点实验室，长沙 410082 西南民族大学旅游与历史文化学院，成都 610041 湖南大学环境科学与工程学院，长沙 410082 湖南大学环境生物与控制教育部重点实验室，长沙 410082%湖南大学环境科学与工程学院，长沙 410082 |
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| Snippet | 探明坡面径流和土壤可蚀性对土壤有机碳流失的影响,对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30~100... S157.1; 探明坡面径流和土壤可蚀性对土壤有机碳流失的影响，对于研究土壤有机碳固定和区域碳循环有重要作用。该文通过野外径流小区模拟降雨试验研究不同雨强（30～100... |
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| SubjectTerms | 可蚀性 土壤 坡面 径流 有机碳 泥沙态 |
| Title | 红壤缓坡地径流与土壤可蚀性对土壤有机碳流失的影响 |
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