| Preliminary study on improvement of soil compaction in Weibei apple orchard |
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| DOI：10.7606/j.issn.1000-7601.2019.05.24 |
| Key Words: soil compaction soil amelioration filling material soil moisture content CO2 release flux Weibei apple orchard |
| Author Name | Affiliation | | WEI Bin-meng | Institute of Land Engineering and Technology, Shaanxi Provincial Land EngineeringConstruction Group Co., Ltd.,Xi’an, Shaanxi 710075, China
Shaanxi Provincial Land Engineering Construction Group Co., Ltd.,Xi'an,Shaanxi 710075, China
Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources, Xi’an, Shaanxi 710075, China | | LI Zhong-hui | Shaanxi Hydrogeology Engineering Geology and Environment Geology Survey Center,Xi’an,Shaanxi 710054, China | | WANG Yi-quan | Institute of Land Engineering and Technology, Shaanxi Provincial Land EngineeringConstruction Group Co., Ltd.,Xi’an, Shaanxi 710075, China
Shaanxi Provincial Land Engineering Construction Group Co., Ltd.,Xi'an,Shaanxi 710075, China
Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources, Xi’an, Shaanxi 710075, China |
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| Abstract: |
| Long-term planting has caused soil compaction on Weibei plateau. In order to improve soil water infiltration and air exchange,drilling and backfilled materials (“skylight”) was used to break the compact layer in the soil of orchard. At the germination stage of fruit trees,three apple orchards (＞20 a)with serious soil degradation were selected as the research objects. Five materials including vermiculite (Z), slag (L), lime (S), vermiculite plus slag (ZL) and vermiculite plus lime (ZS) were,respectively, filled in holes of 10 cm in diameter and 30 cm deep near the apple trees with similar growth vigor. From June to September, soil water content and CO2 release flux were determined three times for each treatment. The results showed that soil water content ranged from 10.84%~20.42% in the“skylight”treatments, but in the control treatment soil water content ranged from 7.46%~15.96% from early June to mid-July. In September, there was no significant difference in soil moisture content among different treatments due to continuous rainfall. Comprehensively, the treatment of vermiculite plus slag had the best effect in improving soil moisture content. From June to September, the CO2 release flux of the surface soil in the “skylight” increased by 7.1%~48.3%，but it decreased by 6.3%~40.4% at the depth of 15 cm compared with the control. Simultaneously, the CO2 release flux of surface soil around the “skylight” increased by 0.2%~37.1%, but decreased by 6.2%~41.6% and 0.6%~26.9%, respectively, at 15 and 30 cm compared with the control. It indicated that 1~30 cm holes filled with different materials could promote the release of CO2 gas in the closed soil. Furthermore, the effects differed from different filling materials, in which lime-vermiculite plus lime had the best effect on enhancing gas exchange. Conclusively, drilling and backfilling materials had good effects on improving permeability and ventilation of compact soil, and the effect varied with the different materials used. |
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