DU Kang,ZHANG Beiying.Characteristics of Soil Moisture Variation in Different Types of Land Uses in the Loess Hilly Region[J].Research of Soil and Water Conservation,2020,27(06):72-76.
黄土丘陵区不同土地利用方式土壤水分变化特征
- Title:
- Characteristics of Soil Moisture Variation in Different Types of Land Uses in the Loess Hilly Region
- 文章编号:
- 1005-3409(2020)06-0072-05
- Keywords:
- soil moisture; land use type; soil water content; loess hilly region
- 分类号:
- S152.7
- 文献标志码:
- A
- 摘要:
- 为了探讨黄土丘陵区不同土地利用方式土壤水分的时空变化特征,合理规划土地利用方式与土壤水资源。选择陕西省延安市安塞县墩山上梯田、草地、刺槐林、沙棘灌丛4种土地利用方式,采用土钻法在2019年5月、7月、8月和10月监测了土壤水分。结果表明:4种土地利用方式的土壤含水量表现为明显的时间特征,存在滞后效应; 0—300 cm深度平均土壤含水量大小表现为梯田>草地>沙棘灌丛>刺槐林; 随土层深度的增加土壤含水量的季节变异系数均逐渐减小,季节变异系数在100 cm以下的土壤深层趋于稳定; 土壤含水量由表土层到深土层上为“S”形,含水量先增大后减小,垂直变化特征明显; 土壤水分变化相似性表现为梯田>沙棘灌丛>草地>刺槐林。刺槐林和沙棘灌丛需要消耗更多深层土壤水分,容易出现土壤干燥化; 梯田和草地的土壤水分条件较好,梯田对土壤水分的调控作用较好,土壤水分在垂直方向上的变化较为平缓。
- Abstract:
- In order to explore the temporal and spatial dynamics of soil moisture in different types of land use in the loess hilly region, plan land use type and soil water resources reasonably, four land use types(terrace, grassland, Robinia pseudoacacia forest, Hippophae rhamnoides scrubland)in Dunshan Mountain, Ansai County of Yan'an City, Shaanxi Province were selected. Soil moisture was monitored in May, July, August and October of 2019 by soil drilling method. The results showed that: the soil water contents of the four land use patterns presented the obvious temporal characteristics, and there was lag effect; the average soil water contents of 0—300 cm depth decreased in the order: terrace>grassland>Hippophae rhamnoides scrubland> Robinia pseudoacacia forest; with the increase of soil depth, the seasonal variation coefficient of soil moisture decreased gradually, and the soil depth with the seasonal variation less than 100 cm tended to be stable; the soil moisture content was S-shaped from the surface soil layer to the deep soil layer; the water content first increased and then decreased, and the vertical change characteristics were obvious. The similarity of soil water change decreased in the order of: terrace> Hippophae rhamnoides scrubland>grassland>Robinia pseudoacacia forest; Robinia pseudoacacia forest and Hippophae rhamnoides shrub consumed more deep soil water, which was prone to soil drying; terrace and grassland had better soil water conditions, terrace had a good control effect on soil moisture, and soil moisture changed gently in the vertical direction.
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备注/Memo
收稿日期:2020-02-19 修回日期:2020-03-02
资助项目:国家自然科学基金“黄土丘陵区深剖面土壤水分特征及其补给地下水过程研究”(41701025); 江苏师范大学研究生科研创新计划项目“黄土丘陵区典型小流域水分循环特征分析”(2019XKT070)
第一作者:杜康(1994—),男,江苏徐州人,硕士研究生,研究方向为生态水文。E-mail:dukang94@163.com
通信作者:张北赢(1981—),女,甘肃兰州人,博士,副教授,研究方向为生态水文及土壤水分转化。E-mail:zhangbeiying@163.com