Journal of Resources and Ecology ›› 2022, Vol. 13 ›› Issue (1): 113-119.DOI: 10.5814/j.issn.1674-764x.2022.01.013

• Restoration Ecology and Ecological Engineering • Previous Articles     Next Articles

The Ecological Water Demand of Different Vegetation Types in the Bashang Area, Northwest Hebei Province

XU Zhongqi1,,*(), ZHANG Naixuan1,(), WANG Ran1, YANG Xin1, SUN Shoujia2, YAN Tengfei3   

  1. 1. College of Forestry, Agricultural University of Hebei, Baoding, Hebei 071000, China
    2. Chinese Academy of Forestry, Beijing 100091, China
    3. Forestry Bureau of Zhangbei County, Zhangbei, Hebei 076450, China
  • Received:2021-07-21 Accepted:2021-10-18 Online:2022-01-30 Published:2022-01-08
  • Contact: XU Zhongqi
  • About author:XU Zhongqi, E-mail: xzq7110@163.com; ZHANG Naixuan, E-mail: 575221370@qq.com.
    First author contact:

    † means that they have the same contribution to this paper.

  • Supported by:
    The Forestry Industry Public Welfare Project(201404206-02)

Abstract:

In order to construct stable vegetation for reducing wind and sand disasters and soil erosion in the Bashang Area of Northwest Hebei Province in China, it is very important to understand the ecological water demand of different vegetation types in this area. Based on observed data and the Irmak-Allen formula, we investigated the ecological water demand and ecological water shortage of arbor, shrub and grassland in Bashang Area of northwestern Hebei province. The results showed that the actual evapotranspiration values of the three vegetation types in the growing seasons in the study area from high to low were arbor forest (401.81 mm), shrub (358.78 mm) and grassland (346.02 mm). The minimum ecological water requirements of arbor forest, shrub and grassland in the growing season were 243.96 mm, 218.35 mm and 211.36 mm, respectively, and the optimal ecological water requirements were 472.99 mm, 423.34 mm and 409.77 mm, respectively. In addition, the optimal ecological water shortage values were 198.56 mm for arbor forest, 148.91 mm for shrub and 135.34 mm for grassland. The ecological water shortage of vegetation has obvious seasonality, with the largest water shortage in May and June, and a lower and steady water surplus in July to October. Therefore, an artificial water supplementation in May and June would alleviate the drought stress of the vegetation. The rainfall in Bashang Area of Northwest Hebei Province can meet the requirements of minimum ecological water demand for arbor forest, but the gap between the rainfall and the optimal ecological water requirement is too large to support good growth of an arbor forest, which could explain why the degradation of poplar protective forests has occurred in Bashang Area.

Key words: Bashang Area, Northwest Hebei, vegetation, actual evapotranspiration, ecological water demand