Abstract
Mulched drip irrigation has been widely used in agricultural planting in arid and semi-arid regions. The dynamics and distribution of soil salinity under mulched drip irrigation greatly affect crop growth and yield. However, there are still different views on the distribution and dynamics of soil salinity under long-term mulched drip irrigation due to complex factors (climate, groundwater, irrigation, and soil). Therefore, the soil salinity of newly reclaimed salt wasteland was monitored for 9 years (2008–2016), and the effects of soil water on soil salinity distribution under mulched drip irrigation have also been explored. The results indicated that the soil salinity decreased sharply in 3–4 years of implementation of mulched drip irrigation, and then began to fluctuate to different degrees and showed slight re-accumulation. During the growth period, soil salinity was relatively high at pre-sowing, and after a period of decline soil salinity tends to increase in the late harvest period. The vertical distribution of soil texture had a significant effect on the distribution of soil salinity. Salt accumulated near the soil layer transiting from coarse soil to fine soil. After a single irrigation, the soil water content in the 30–70 cm layer under the cotton plant undergoes a ‘high–low–high’ change pattern, and the soil salt firstly moved to the deep layer (below 70 cm), and then showed upward migration tendency with the weakening of irrigation water infiltration. The results may contribute to the scientific extension of mulched drip irrigation and the farmland management under long-term mulched drip irrigation.
Highlights
Soil salinization is a major obstacle to the sustainable development of irrigated agriculture.Ten percent of arable lands worldwide are affected by salinization, and 4 million km2 of arable lands lose planting function due to salinization [1,2]
This paper presents the change characteristics of soil salinity under long-term drip irrigation and the impact of soil texture and soil water on soil salinity, in order to provide a basis for soil salt management under long-term mulched drip irrigation in arid and semi-arid areas
Spatial distribution of soil water and salinity was presented through typical contours using Origin 9.0
Summary
Soil salinization is a major obstacle to the sustainable development of irrigated agriculture.Ten percent of arable lands worldwide are affected by salinization, and 4 million km of arable lands lose planting function due to salinization [1,2]. Soil salinization is a major obstacle to the sustainable development of irrigated agriculture. Secondary salinization has a more serious impact on agricultural development in arid and semi-arid areas, with salinization affecting 9–25% of cultivated land in Tunisia, the United States, India and South Africa. Northwest China, suffers from severe soil salinity. One of the main crops in Xinjiang, belongs to a salt-tolerant crop. The cotton tolerance to irrigation water salinity (electrical conductivity) and soil salinity (electrical conductivity) are 5.1 dS m−1 and 7.7 dS m−1 under 100% yield potential, while 18 dS m−1 and 27 dS m−1 under 0% yield potential [4]. The large area of severe saline-alkali land seriously restricts effective use of the land and the development of
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