| Effects of double ridge geotextile mulching on soil moisture in arid and semi\|arid regions |
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| DOI：10.7606/j.issn.1000-7601.2020.02.03 |
| Key Words: geo\|textile fabric mulching on the ridge soil moisture rain and dew superposition arid and semi\|arid area |
| Author Name | Affiliation | | ZHONG Zhe | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China | | JIA Zhifeng | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China
Institute of Water and Development, Chang’an University, Xi’an, Shaanxi 710054, China | | WANG Zhi | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China
Institute of Water and Development, Chang’an University, Xi’an, Shaanxi 710054, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100， China
Department of Earth and Environmental Sciences, California State University, Fresno, CA 93740, USA | | LU Yudong | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China
Institute of Water and Development, Chang’an University, Xi’an, Shaanxi 710054, China | | REN Tao | College of Environmental Science and Engineering, Chang’an University, Xi’an, Shaanxi 710054, China
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710054, China | | CHEN Jin | Dingxi Institute of Soil and Water Conservation, Dingxi, Gansu 743000, China | | WANG Xiaoping | Dingxi Institute of Soil and Water Conservation, Dingxi, Gansu 743000, China |
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| Abstract: |
| In order to evaluate the feasibility of a substitute material\|geotextile weed blocker, a one\|year long monitoring experiment was carried out in Anding District, City of Dingxi, Gansu Province. The experimentation included three treatments: weed\|blocking geo\|textile fabric plus plastic film mulching on the ridge (MB), geo\|textile fabric mulching on the ridge (DB), and bare soil ridge (CK). Soil moisture and water potential sensors were installed to monitor the changes in soil moisture content and water potential at 5 cm and 15 cm below the surface of the furrow. The results showed that: (1) Diurnal variation of moisture in top 5 cm surface soil was wave\|like, which was significantly influenced by the ridge cover types and the seasonal climate changes. (2) The annual variation of water content in top 0~20 cm soil was mainly affected by rainfall, dew, and evaporation rates. It can be characterized as dry in spring and winter, and wet in summer and autumn. From November to February, the net loss of soil water in MB and DB was higher than CK, but during the crop growing season (May\|September), the net gain of soil water storage was the highest in DB (36.35 mm), followed closely by MB (30.73 mm) and the lowest in CK (16.30 mm); (3) Ridge mulching under MB and DB obviously accelerated the superposition of rain and dew over the ridge so as to increase soil water storage in the furrow. This effect was weak under CK treatment, and the deep soil infiltration was less responsive to rainfall and dew, showing a lagging effect. But, with the occurrence of continuous rainfall, this lagging was obviously weakened due to higher water storage in the top layer; (4) The diurnal variation of 0~20 cm soil water storage was the largest in summer (average 1.20 mm·d-1), medium in spring (1.03 mm·d-1) and the smallest in autumn (0.79 mm·d-1). The annual net harvest with different ridge covering measures was the highest with DB (24.9 mm), followed closely by MB (21.5 mm) and the smallest with CK (only 11.4 mm). Overall, ridge mulching using geotextile fabric alone had the best water harvesting effect. This weed\|blocking fabric can be used for multiple years without fragmentation and soil pollution problems associated with plastic film mulching, but in the no\|rain season, because of higher soil moisture in the furrow, its evaporation rate was slightly higher than the bare ridge treatment. |
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