Soil salt leaching in non-growth period and salinity dynamics under mulched drip irrigation in arid area
Soil salt leaching in non-growth period and salinity dynamics under mulched drip irrigation in arid area
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DOI：
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发表时间：
2015
影响因子：
2.4
通讯作者：
Hu Hongchan
中科院分区：
文献类型：
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作者：
Hu Hongchan
Soil salinity trend is affected by both salt accumulation and leaching during the growth and non-growth periods. To explore the long-term salinization trend of farmland under mulched drip irrigation,the ex-periments were conducted from 2008 to 2013 in a cotton field in Xinjiang province,northwestern China.More than 15 000 soil samples were collected and tested. With Simultaneous Heat and Water model(SHAW),the salt leaching during the non-growth period was studied. Associated with the soil salt distribu-tion and migration study in the growth period in the other companion papers,the salinization trend in the ar-id area was evaluated. The results indicate that the salt leaching is obvious in both winter and springflush. The leaching depth of soil salt is approximately 60 cm in winter flush,which is superior to thespring flush. According to the salt leaching during non-growth period in arid area,soil salinization trendcan be controlled and salt balance can be maintained when mulched drip irrigation is adopted in growth pe-riod. In consideration of irrigation water amount in growth period only,the water use efficiency(WUE) is0.68 kg·m- 3and 0.22 kg·m- 3for mulched drip and flood irrigation,respectively. Even if the leaching wateramount in non-growth period(375 mm) is taken into account,the WUE of mulched drip irrigation is 0.42kg·m-3and still higher than the value of flood irrigation. The results show that in arid and semi-arid areas,the soil salinization trend can be controlled and the WUE will be also improved when the mulched drip irri-gation in growth period and the salt leaching measures in non-growth period are both adopted.
