Once-middle amount of straw interlayer enhances saline soil quality and sunflower yield in semi-arid regions of China: Evidence from a four-year experiment

稻草 农学 土壤碳 向日葵 营养物 环境科学 灌溉 土壤质量 总有机碳 土壤盐分 土工试验 土壤水分 化学 土壤科学 环境化学 生物 有机化学
作者
Fangdi Chang,Hongyuan Zhang,Jiashen Song,Ru Yu,Xia Zhang,Haoruo Li,Jing Wang,Zheng‐Rong Kan,Yuyi Li
出处
期刊:Journal of Environmental Management [Elsevier BV]
卷期号:344: 118530-118530 被引量:28
标识
DOI:10.1016/j.jenvman.2023.118530
摘要

Straw deep returning as an interlayer is a novel practice to enhance soil carbon and nutrients. However, the impact of applying various amounts of straw as an interlayer on soil quality still remain unclear in the saline soil. Therefore, a field experiment was carried out over four years (2015-2018) in Hetao Irrigation District, China. The aim was to evaluate the impact of four straw interlayer rates (i.e., 0, 6, 12, and 18 Mg ha-1) applied at 40 cm depth on soil quality index (SQI) and its relationship to sunflower yield in saline soil. Our results showed that, in comparison to no straw interlayer (CK), straw interlayers applied at rates of 6, 12, and 18 Mg ha-1 improved SQI on average by 2.0, 2.7, and 3.0 times in four years, respectively (p < 0.05). This suggested that straw deep returning as an interlayer improved SQI, especially for middle and high amounts (12 and 18 Mg ha-1). Partial least squares path model (PLSPM) illustrated that the improvement of SQI was due to the high-moisture and low-salt environment created by straw interlayer in the early two years (2015-2016), while the higher soil nutrients released from straw decomposition in the subsequent years (2017-2018). The improvement of SQI contributed to sunflower yield, which was related to the decrease of soil salinity, the increase of soil moisture, soil organic carbon (SOC), total nitrogen (TN), and available nutrients under straw interlayers. The sunflower yield was increased by 8.7-13.4% under straw interlayers (p < 0.05), following the order of 18 = 12 > 6 >0 Mg ha-1. The greater increment of yield was detected during the initial phase of burying straw interlayers, which indicated that straw as an interlayer played a more important role than nutrient supply from straw decomposition. The findings highlighted that appropriate straw return amount (i.e., 12 Mg ha-1) as an interlayer is an economic practice to benefit soil quality and crop yield synchronously in salt-affected soils.
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