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冰川冻土 ›› 2020, Vol. 42 ›› Issue (3): 1007-1016.doi: 10.7522/j.issn.1000-0240.2020.0073

• 冰冻圈水文与水资源 • 上一篇    下一篇

兰州新区黄土工程开挖边坡植被重建初期土壤水分初步研究

刘乐1,2(), 孙宏义1(), 蔡忠兰3, 张建新4, 李东泽4   

  1. 1.中国科学院 西北生态环境资源研究院,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
    3.甘肃省气象服务中心,甘肃 兰州 730020
    4.甘肃汇丰生态建设有限公司,甘肃 兰州 730000
  • 收稿日期:2020-05-26 修回日期:2020-07-13 出版日期:2020-10-31 发布日期:2020-12-08
  • 通讯作者: 孙宏义 E-mail:857687671@qq.com;sunhy569@lzb.ac.cn
  • 作者简介:刘乐(1993 - ), 女, 山西临县人, 2016年在山西财经大学获学士学位, 现为中国科学院西北生态环境资源研究院在读硕士研究生, 从事水土保持研究. E-mail: 857687671@qq.com
  • 基金资助:
    兰州市人才创新创业项目(2017-RC-26)

Preliminary study on the soil moisture of slopes of loess in Lanzhou New Area formed by engineering excavation in the early stage of revegetation

Le LIU1,2(), Hongyi SUN1(), Zhonglan CAI3, Jianxin ZHANG4, Dongze LI4   

  1. 1.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.University of Chinese Academy of Sciences,Beijing 100049,China
    3.The Gansu Province Meteorological Service Center,Lanzhou 730020,China
    4.Gansu Huifeng Ecological Construction Co. ,Ltd. ,Lanzhou 730000,China
  • Received:2020-05-26 Revised:2020-07-13 Online:2020-10-31 Published:2020-12-08
  • Contact: Hongyi SUN E-mail:857687671@qq.com;sunhy569@lzb.ac.cn

摘要:

兰州新区位于黄土高原西段, 为典型干旱区, 道路修建形成了许多坡度大于30°的工程开挖边坡。在边坡上重建植被对改善局地景观和防治水土流失具有重要的作用, 而坡面土壤水分状况对植被重建影响重大。选择3种整地类型(条形坑、 圆形坑和原状坡样地), 研究兰州新区黄土工程开挖边坡植被重建的初期土壤水分状况, 结果表明: 3种整地类型中条形坑的土壤水分条件最好, 与圆形坑、 原状坡样地土壤水分存在显著差异(P<0.05)。不同灌溉频率下原状坡样地0 ~ 20 cm土层土壤含水量较低, 20 ~ 50 cm土层土壤含水量较高。土壤含水量的变异系数随土层深度的增加而减小, 随灌溉频率的降低而增加。在边坡植被重建初期, 需把土壤水分维持在8.4% ~ 10.8%, 即田间持水量的38% ~ 49%, 才能保证植物正常生育生长。当栽植的植被根系长度大于10 cm时, 可考虑将喷灌频率从每天喷灌改为隔天喷灌, 否则植物有死亡的风险。研究结果可为类似的黄土边坡植被恢复和生态建设提供参考。

关键词: 边坡, 植被护坡, 土壤水分, 黄土高原, 整地

Abstract:

Lanzhou New Area is located in the west of the Loess Plateau, which is a typical arid area. Many engineering slopes with over 30° are formed during road construction. Revegetation on slopes plays an important role in improving local landscape and preventing soil erosion, and soil moisture status on slopes has a great impact on revegetation. Three types of soil preparation (the strip-shaped pit, the round-shaped pit and the original slope) were selected to study on the soil moisture of slopes of loess in Lanzhou New Area formed by engineering excavation in the early stage of revegetation. The results show that: (1) In the three types of soil preparation, the soil moisture condition of the strip-shaped pit is the best, and there is a statistically significant difference between the strip-shaped pit, the the round-shaped pit and the original slope (P<0.05). (2) On the undisturbed slope plots under different irrigation frequency in 0 - 20 cm soil layer soil moisture content is low and in 20 to 50 cm soil layer soil moisture content is higher. With the increase of soil depth, the variation coefficient of soil water content decreases. With the decrease of irrigation frequency, the variation coefficient of soil water content increases, and the active soil layer increases from 0 - 10 cm to 0 - 40 cm, while the variation coefficient of 40 - 50 cm soil layer remains below 10% in different irrigation stages. (3) In the early stage of vegetation reconstruction of the slope, the soil moisture should be maintained at 8.4% ~ 10.8%, that is, the field water capacity 38% - 49%, in order to ensure the normal growth of plants; when the root length of the planted vegetation is more than 10 cm, it can be considered to change the sprinkling irrigation frequency from daily to alternate days, otherwise vegetation will be in danger of death;the results can provide reference for vegetation restoration and ecological construction of similar slopes of loess.

Key words: slopes, slope protection with vegetation, soil moisture, Loess Plateau, soil preparation

中图分类号: 

  • Q948.112+3