WANG Yueling,WANG Sicheng,XU Hao,et al.Evaluation of Deep Soil Water Deficit in Alfalfa Field With Different Years of Returning Farmland in Loess Area of Southern Ningxia[J].Northern Horticulture,2025,(18):113-121.[doi:10.11937/bfyy.20251020]
宁南黄土区不同退耕年限苜蓿地深层土壤水分亏缺评价
- Title:
- Evaluation of Deep Soil Water Deficit in Alfalfa Field With Different Years of Returning Farmland in Loess Area of Southern Ningxia
- 文章编号:
- 1001-0009(2025)18-0113-09
- Keywords:
- loess region of southern Ningxia; alfalfa field; years of returning farmland; soil moisture; dry layer of soil
- 分类号:
- S 152.7
- 文献标志码:
- A
- 摘要:
- 以宁南黄土区彭阳玉洼村不同退耕年限苜蓿地(4年、20年、30年、50年,农地为对照)为试材,采用人工土钻采集0~1 000 cm土壤样品,研究了不同年限苜蓿地对深层土壤水分亏缺及干燥化的影响,以期为宁南黄土区人工草地建设及生态环境恢复提供参考依据。结果表明:1)不同退耕年限苜蓿地和对照农地深层土壤水分变化差异显著(P<0.05),深层土壤水分平均含量和土壤储水量均呈现出农地>4年>20年>50年>30年,耗水量表现为30年>50年>20年>4年,在垂直剖面土壤水分随土层深度增加总体呈现先增加后降低的变化趋势;2)深层农地基本没有水分亏缺和干层发生,苜蓿地均呈现不同程度的土壤水分亏缺现象,4年、20年、30年、50年苜蓿地平均CSWDI分别为0.28、0.75、0.90、0.83,平均SDI分别为101.64%、38.26%、13.72%、22.49%、185.25%(农地),可以看出30年苜蓿地土壤水分亏缺最严重,其次为50年、20年、4年;3)不同退耕年限苜蓿地土壤干层出现的区域和发生的程度均不相同,分别呈现轻度干燥化(4年)、严重干燥化(20年)、强烈干燥化(30年和50年),DSLT分别为4年为380 cm,20年、30年 和50年均为800 cm,干层土壤含水量分别为12.23%、8.52%、7.20%、7.72%。总体反映出不同退耕年限苜蓿深层通体干化,水分很难恢复,应采取相应措施恢复土壤水分,以促进区域水土资源可持续利用和生态健康发展。
- Abstract:
- Taking the alfalfa fields with different years (4 a,20 a,30 a,50 a,farmland as control) in Yuwa village,Pengyang,southern Ningxia as the test materials,soil samples in 0-1 000 cm soil layer were collected to analyze the water deficit and desiccation degree of deep soil in aging alfalfa field by artificial soil drill sampling,in order to provide reference for artificial grassland construction and ecological environment restoration in loess area of southern Ningxia.The results showed that,1) there was a significant difference in deep soil moisture between the aged alfalfa field and the control (P<0.05).The average content of deep soil moisture and soil water storage showed farmland>4 a>20 a>50 a>30 a,and the water consumption was 30 a>50 a>20 a>4 a.The soil moisture in the vertical profile increased first and then decreased with the increase of soil depth.2) There was basically no water deficit and dry layer in deep farmland,and the aging alfalfa field showed different degrees of soil water deficit.The average CSWDI of 4 a,20 a,30 a and 50 a alfalfa field was 0.28,0.75,0.90 and 0.83,respectively,and the average SDI was 101.64%,38.26%,13.72%,22.49% and 185.25% (farmland),respectively.It could be seen that the soil water deficit of 30 a alfalfa field was the most serious,followed by 50 a,20 a and 4 a.3) The area and degree of occurrence of soil dry layer in aging alfalfa field were different,showing mild desiccation (4 a),severe desiccation (20 a),strong desiccation (30 a and 50 a),respectively.The DSLT of 4 a was 380 cm,20 a,30 a and 50 a were all 800 cm,and the soil water content of dry layer was 12.23%,8.52%,7.20% and 7.72%,respectively.In general,it reflected that the deep layer of aging alfalfa was dried and the water was difficult to recover.Corresponding measures should be taken to restore soil moisture to promote the sustainable utilization of regional water and soil resources and the healthy development of ecology.
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备注/Memo
第一作者简介:王月玲(1980-),女,硕士,副研究员,现主要从事黄土高原水土保持与生态环境建设等研究工作。E-mail:wylnxnky@163.com.责任作者:许浩(1979-),男,博士,副研究员,现主要从事生态修复等研究工作。E-mail:hz92@163.com.基金项目:宁夏农业高质量发展和生态保护科技创新示范资助项目(NGSB-2021-14-02);宁夏区自然科学基金资助项目(2022AAC03422)。收稿日期:2025-03-19