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DOI	10.5194/hess-22-3075-2018
	Precipitation alters plastic film mulching impacts on soil respiration in an arid area of northwest China
	Ming G.; Hu H.; Tian F.; Peng Z.; Yang P.; Luo Y.
发表日期	2018
ISSN	1027-5606
起始页码	3075
结束页码	3086
卷号	22 期号:5
英文摘要	Plastic film mulching (PFM) has widely been used around the world to save water and improve crop yield. However, the effect of PFM on soil respiration (Rs) remains unclear and could be further confounded by irrigation and precipitation. To address these topics, controlled experiments were conducted in mulched and non-mulched fields under drip irrigation from 2014 to 2016 in an arid area of the Xinjiang Uygur Autonomous Region, northwest China. The spatio-temporal pattern of soil surface CO2 flux as an index of soil respiration under drip irrigation with PFM was investigated, and the confounded effects of PFM and irrigation/precipitation on soil respiration were explored. The main findings were as follows. (1) Furrows, planting holes, and plastic mulch are three important pathways of soil CO2 emissions in mulched fields, of which the planting hole efflux outweighs that from the furrow, with the largest values of 8.0 and 6.6μmolm-2s-1, respectively, and the plastic mulch itself can emit up to 3.6μmolm-2s-1 of CO2. (2) The frequent application of water (i.e. through irrigation and precipitation) elevates soil moisture and soil respiration and enhances their variation. The resultant higher variation of soil moisture further alleviates the sensitivity of soil respiration to soil temperature, leading to a weak correlation and lower Q10 values. (3) Soil CO2 effluxes from furrows and ridges in mulched fields outweigh the corresponding values in non-mulched fields in arid areas. However, this outweighing relation attenuates with increasing precipitation. Furthermore, by combining our results with those from the literature, we show that the difference in soil CO2 effluxes between non-mulched and mulched fields presents a linear relation with the amount of precipitation, which results in negative values in arid areas and positive values in humid areas. Therefore, whether PFM increases soil respiration or not depends on the amount of precipitation during the crop-growing season. © Author(s) 2018.
语种	英语
scopus关键词	Arid regions; Carbon dioxide; Crops; Cultivation; Plastic films; Sensitivity analysis; Soil moisture; Soil surveys; Controlled experiment; Drip irrigation; Plastic film mulching; Soil respiration; Soil temperature; Spatiotemporal patterns; Weak correlation; Xinjiang Uygur autonomous region; Irrigation; arid region; carbon flux; crop yield; drip irrigation; irrigation; mulch; mulching; plastic; precipitation (climatology); soil carbon; soil moisture; soil respiration; China; Xinjiang Uygur
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160014
作者单位	Ming, G., Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Hu, H., Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Tian, F., Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Peng, Z., Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Yang, P., Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China; Luo, Y., Department of Earth System Science, Tsinghua University, Beijing, 100084, China, College of Engineering, Forestry, and Natural Sciences, Northern Arizona University, Flagstaff, AZ, United States
推荐引用方式 GB/T 7714	Ming G.,Hu H.,Tian F.,et al. Precipitation alters plastic film mulching impacts on soil respiration in an arid area of northwest China[J],2018,22(5).
APA	Ming G.,Hu H.,Tian F.,Peng Z.,Yang P.,&Luo Y..(2018).Precipitation alters plastic film mulching impacts on soil respiration in an arid area of northwest China.Hydrology and Earth System Sciences,22(5).
MLA	Ming G.,et al."Precipitation alters plastic film mulching impacts on soil respiration in an arid area of northwest China".Hydrology and Earth System Sciences 22.5(2018).