Deep soil water deficit and recovery in alfalfa fields of the Loess Plateau of China,Field Crops Research

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Deep soil water deficit and recovery in alfalfa fields of the Loess Plateau of China
Field Crops Research ( IF 5.8 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.fcr.2020.107990
Gulnazar Ali , Zikui Wang , Xinrong Li , Naixuan Jin , Huiying Chu , Lijuan Jing

Abstract Alfalfa (Medicago sativa L.) is the most widely planted forage crop on the semiarid Loess Plateau of China. It has a deep rooting system and high evapotranspiration rate, and how water content in deep soil is affected by continuous alfalfa planting and how soil water recovery responds to the conversion of alfalfa to annual crops are not fully understood. In this study, we conducted a meta‐analysis of soil water content data taken from 45 published studies conducted at 21 sites of the Loess Plateau to evaluate the effects of continuous alfalfa planting and the conversion of alfalfa to annual crops on soil water conditions in the 0−1500 cm profile. Response size (RS), the relative change in soil water content after initiating and stopping alfalfa compared to the long-term cropland, was calculated. The results show that the RS values in all soil layers from 100 to 1400 cm were significantly lower than zero (P 10-year-old alfalfa fields, respectively. After converting alfalfa into annual crops for 1–28 years, the soil water content in the 0−300 cm layer was recovered, but that in the 300−1000 cm layer was still significantly lower than that in the reference field (P

更新日期：2021-01-01

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