Effects of Conservation Tillage on Soil Respiration in Vetch Field in Rain-fed Loessial Tablelands

DU Shanshan; YANG Qian; ZHANG Qingping; WANG Tao; SHEN Yuying

doi:10.13961/j.cnki.stbctb.2015.06.025

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Effects of Conservation Tillage on Soil Respiration in Vetch Field in Rain-fed Loessial Tablelands

- Effects of Conservation Tillage on Soil Respiration in Vetch Field in Rain-fed Loessial Tablelands
- Bulletin of Soiland Water Conservation Vol. 35, Issue 6, Pages: 144-148(2015)
- 作者机构：
  
  1. 草地农业系统国家重点实验室,甘肃,兰州,730020
  2. 兰州大学草地农业科技学院,甘肃,兰州,730020
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2015.06.025
  CLC：
- Published：2015
- 稿件说明：
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DU Shanshan, YANG Qian, ZHANG Qingping, et al. Effects of Conservation Tillage on Soil Respiration in Vetch Field in Rain-fed Loessial Tablelands[J]. Bulletin of Soiland Water Conservation, 2015, 35(6): 144-148.
DOI：

DU Shanshan, YANG Qian, ZHANG Qingping, et al. Effects of Conservation Tillage on Soil Respiration in Vetch Field in Rain-fed Loessial Tablelands[J]. Bulletin of Soiland Water Conservation, 2015, 35(6): 144-148. DOI： 10.13961/j.cnki.stbctb.2015.06.025.

摘要

[目的

]

揭示保护性耕作对土壤呼吸的影响

为旱区保护性农业的发展提供理论依据。[方法

]

采用多通道土壤碳通量系统监测传统耕作(T)、传统耕作+秸秆覆盖(TS)、免耕(NT)和免耕+秸秆覆盖(NTS)下箭筈豌豆(Vicia sativa)地的土壤呼吸速率。[结果

]

各措施下花期呼吸速率比收获期高10.45%~45.09%

NTS处理下土壤呼吸速率最低别比TS

NT和T处理显著减少39.17%

21.37%和30.25%(p

0.01)。耕作处理(T

TS)下日均土壤呼吸速率高于免耕处理(NT

NTS)(p>0.05)。晴天土壤呼吸变化呈单峰曲线

最大值出现在14:00。耕作下土壤呼吸速率与气温显著线性相关

免耕下(NT

NTS)与气温呈指数关系(p

0.01)。不同耕作措施间气温敏感性Q

值大小依次为:T(1.97) >NT(1.62) >TS(1.58) >NTS(1.52)。[结论

]

免耕加秸秆还田处理对减少温室气体排放有一定的贡献。

Abstract

[Objective] The effects of conservation tillage on soil respiration were researched to provide a theoretical basis for the development of conservation agriculture in arid area.[Methods] Soil respiration rate was carried out using multi-channel soil carbon flux measurement system instrument. Tillage treatments were:conventional tillage(T)

conventional tillage with stubble retention(TS)

no tillage(NT) and no tillage with stubble retention(NTS).[Results] Respiration rate in flowering period was 10.45%~45.09% higher than that in harvest period for all tillage measures. In comparison with TS

NT and T treatment

NTS treatment significantly reduced soil C emission with the percentages of 39.17%

21.37% and 30.25%

respectively(p<0.01). Soil respiration at sunny day presented an stubble unimodal curve with the peak value at 14:00. The averaged daily soil respiration rates under the two tillage treatments were high but not insignificant than that under the two no-tillage treatments. Under tillage treatments(T

TS)

a significant linear correlation was found between soil respiration rate and air temperature; under the no-tillage treatment(NT

NTS)

they had a significant exponential relationship(p<0.01). Q10 values

namely the atmospheric temperature sensitivity under the four tillage treatments had a rank of T(1.97) >NT(1.62) >TS(1.58) >NTS(1.52).[Conclusion] Conservation tillage as the no tillage with stubble retention(NTS) has its contribution to the reduction of greenhouse gas emissions.

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references

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