Soil water utilization characteristics of slope land in hedgerow and grain crop intercropping systems on the Loess Plateau

doi:10.11686/cyxb2017298

Abstract

Abstract: This study investigated soil water utilization characteristics in hedgerow intercropping systems by analyzing the grain yield and water consumption characteristic in hedgerow and grain crop intercropping systems on the Loess Plateau of central Gansu. Five treatments were compared: fallow (F), wheat monoculture (W), wheat and Licorice inter-cropping (W/L), wheat and Radix isatidis intercropping (W/I) and wheat and alfalfa intercropping (W/A). The results showed that the soil moisture along 0-200 cm soil profile of croplands with different treatments was obviously lower, being equal to crop lower limit. Soil water content at 0-30 cm was greatly improved under hedgerows and grain crop intercropping systems with highest soil water content in the W/A treatment. The highest water consumption (251.0 mm) occurred in the W/L treatment, while the lowest (197.3 mm) occurred in the W treatment. The ratio of soil evaporation and water consumption was higher than 80% in the F treatment, indicating that water loss was mainly through evaporation in the F treatment but mainly through transpiration in hedgerows-crop intercropping systems. Hedgerows and grain crop intercropping systems were able to decrease E/ET to some extent and increase crop transpiration. There were treatment differences for water consumption, but grain yields in intercrop systems were 60.0% to 83.6% higher than wheat monoculture. As a result, water use efficiency improved from 49.7% to 76.1% under hedgerows and grain crop intercropping systems compared to wheat monoculture.

Key words: Loess Plateau, hedgerows and grain crop intercropping systems, water use efficiency, evaporation

LIU Jia-he, NIU Yi-ning, LUO Zhu-zhu, CAI Li-qun, ZHANG Ren-zhi, XIE Jun-hong. Soil water utilization characteristics of slope land in hedgerow and grain crop intercropping systems on the Loess Plateau[J]. Acta Prataculturae Sinica, 2018, 27(6): 111-119.

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