| Effects of different surface mulching on jujube stem sap flow characteristics |
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| DOI：10.7606/j.issn.1000-7601.2016.01.19 |
| Key Words: surface mulching jujube sap flow environmental factors thermal diffusion |
| Author Name | Affiliation | | TANG Min | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHAO Xi-ning | Institute of Soil and Water Saving Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Saving Conservation, CAS & MWR, Yangling, Shaanxi 712100, China | | WU Pu-te | Institute of Soil and Water Saving Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Saving Conservation, CAS & MWR, Yangling, Shaanxi 712100, China | | GAO Xiao-dong | Institute of Soil and Water Saving Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Saving Conservation, CAS & MWR, Yangling, Shaanxi 712100, China | | HUANG Jun | College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to explore the effects of different surface mulching patterns on jujube stem sap flow characteristics, this study was based on different surface mulching simulated experiments, and thermal diffusion probe technology was applied to measure jujube stem sap flow during the main growing season (June 2013 to September). The change rule of stem sap flow velocity, as well as its response to environmental factors, was analyzed in four treatments: whole jujube branches mulching (WJBM), jujube branches mulching + strip white clover cover (JBM+SWC), whole white clover cover (WCC) and clean cultivation (CC). The results indicated that diurnal variation of stem sap flow velocity in each treatment showed a typical broad curve in sunny day; while in cloudy day, it showed a multi-peak wavy curve, and the trends were basically consistent. The daily average stem sap flow velocity of the four treatments in a cloudy day were lower than that in a sunny day, and the reduction percentages were 48.45%(WJBM),41.94%(JBM+SWC), 45.59%(CC) and 62.51%(WCC), respectively. Under the same weather condition, stem sap flow velocity was at a high level both in WJBM and JBM+SWC, while it was low in WCC. In a sunny day, WCC displayed extremely significant differences with WJBM and JBM+SWC (P<0.01), as well as significant difference with CC (P<0.05); WJBM also had significant difference with CC (P<0.05). In a cloudy day, significant differences existed between WCC, and WJBM and JBM+SWC (P<0.05). The monthly variation of stem sap flow velocity under different surface mulching was basically similar. The monthly average stem sap flow velocity of each treatment reached the highest in August, 0.0984 cm·min-1 for WJBM, 0.1032 cm·min-1 for JBM+SWC, 0.0723 cm·min-1 for CC and 0.0538 cm·min-1 for WCC, while they were the lowest in September. For all the four treatments, the monthly average stem sap flow velocity and average soil volumetric water content in the 0～70 cm soil layer generally followed the order: WJBM>JBM+SWC>CC>WCC. Jujube transpiration velocity (Tr) in differ
ent treatments was negatively correlated with the air relative humidity (RH), while was positively correlated with photosynthetically active radiation (PAR), air temperature (Tair) and wind speed (Vwind). PAR was the dominant environmental factor affecting jujube transpiration for each treatment. |
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