Surface mulching and a sandy soil interlayer suppress upward enrichment of salt ions in salt-contaminated field
- 81 Downloads
The suppression effect of a sandy soil interlayer on topsoil enrichment of salt ions was investigated. However, whether this suppression effect was enhanced by surface mulching was little documented. The objectives of this study were to compare the suppression effects under different materials mulching, and to investigate an innovative method to suppress the soil salt ions down-to-top enrichment.
Materials and methods
In this study, the sandy soil layer was pre-positioned at 60–100 cm depth in a salt-contaminated site in advance, achieving the suppression effect on surface enrichment of salt components as expected. Three treatments were herein designed as bare field (CK), plastic film mulching (PM), and maize straw mulching (SM) to examine the dynamics of water and salt movement across soil profiles during the summer with strong evaporation.
Results and discussions
Results showed that total salt content was increased by 21.3 and 8.0% in CK and SM respectively, while decreased by 24.9% in PM at the end of strong evaporation period, comparing with the beginning. Thus, surface mulching further strengthened this suppression effect, but PM displayed better performance than SM did. The data also demonstrated that vertical transport of soil water was much restrained in PM and SM, accordingly inhibiting upward transfer of salt ions. Particularly, sodium adsorption ratio (SAR) ranged from 14.3–265.7, 17.9–147.1, 38.4–147.2 mmol1/2 kg−1/2 at a shallow soil layer (0–60 cm) in CK, PM, and SM, respectively.
The results suggested that sandy soil interlayer settings with plastic mulching are a critical technical strategy for salt-contaminated land reutilization and management.
KeywordsManas River watershed Plastic film mulching Salt enrichment Sodium adsorption ratio Suppression effect Water and salt movement
This work is financially supported by International Cooperation Program of Ministry of Science and Technology of China (2015DFG31840), Natural Science Foundation of China (31570415), National Basic Research Program of China (973 Program) (2009CB825101), State Technology Support Program (2015BAD22B04), Fundamental Research Funds for the Central Universities of China (lzujbky-2015-br02), and Overseas Masters Program of Ministry of Education (Ms2011LZDX059).
- Akram NA, Ashraf M, Al-Qurainy F (2011) Aminolevulinic acid-induced changes in yield and seed-oil characteristics of sunflower (Helianthus annuus L.) plants under salt stress. Pakistan J Bot 43:2845–2852Google Scholar
- Heydarzadeh M, Khorsandi F, Mousavi AA (2014) The effects of three types of lithic mulches on salinity and moisture conservation in a heavy textured soil. Adv Environ Biol 8(811):1168–1172Google Scholar
- Lai XQ (2007) Study on the ecological reconstruction of the saline abandoned farmland in oasis. China Agriculture Press. Beijing(In Chinese) Google Scholar
- Liu HM, Chen WM, Dong XB, Zhang XS (2009) Sustainable agricultural paradigm of mountain-oasis-ecotone-desert system in inland Manasi River Basin, Xinjiang Province, northwest China. Computer and Computing Technologies in Agriculture II1:197–207Google Scholar
- Lu RK (2002) Analysis method in soil agricultural chemistry. China Agricultural Scientific and Technological Press, Beijing (in Chinese) Google Scholar
- Shi WJ, Shen B, Wang ZR, Zhang JF (2005) Water and salt transport in sand-layered soil under evaporation with the shallow underground water table. Transactions Chinese Soc Agricultural Engineering 21:23–26Google Scholar
- Wang ZQ (1993) Salt-affected soils of China. Science Press, Beijing (in Chinese) Google Scholar
- Wang YJ, Xie ZK, Malhi SS, Vera CL, Zhang YB, Guo ZH (2011) Effects of gravel–sand mulch, plastic mulch and ridge and furrow rainfall harvesting system combinations on water use efficiency, soil temperature and watermelon yield in a semi-arid Loess Plateau of northwestern China. Agr Water Manage 101:88–92CrossRefGoogle Scholar
- Xie ZK, Wang YJ, Cheng GD, Malhi SS, Vera CL, Guo ZH, Zhang Y (2010) Particle-size effects on soil temperature, evaporation, water use efficiency and watermelon yield in fields mulched with gravel and sand in semi-arid Loess Plateau of northwest China. Agr Water Manage 97:917–923CrossRefGoogle Scholar
- Zhang JG, Xu XW, Lei JQ, Sun SG, Fan JL, Li SY et al (2008) The salt accumulation at the shifting aeolian sandy soil surface with high salinity groundwater drip irrigation in the hinterland of the Taklimakan Desert. Chinese Sci Bullet 53:63–70Google Scholar