The Dynamic of Soil Water Utilization in Spring and Summer of Young Haloxylon ammodendron at Deep Groundwater of Southern Edge of Gurbantünggüt Desert

FU Sihua1; 2; HU Shunjun1; YANG Tao1

doi:10.13870/j.cnki.stbcxb.2016.05.038

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The Dynamic of Soil Water Utilization in Spring and Summer of Young Haloxylon ammodendron at Deep Groundwater of Southern Edge of Gurbantünggüt Desert

更新时间：2025-03-12

- The Dynamic of Soil Water Utilization in Spring and Summer of Young Haloxylon ammodendron at Deep Groundwater of Southern Edge of Gurbantünggüt Desert
- Vol. 30, Issue 5, Pages: 230-234(2016)
- 作者机构：
  
  1. 中国科学院新疆生态与地理研究所，荒漠与绿洲生态国家重点实验站,乌鲁木齐,830011
  2. 中国科学院大学,北京,100049
  3. 河海大学水文水资源学院,南京,210098
  4. 赣州水务集团有限责任公司,江西,赣州,341000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2016.05.038
  CLC： Q945.17;S152.7
- Published：2016
- 稿件说明：
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FU Sihua1, 2, HU Shunjun1, et al. The Dynamic of Soil Water Utilization in Spring and Summer of Young Haloxylon ammodendron at Deep Groundwater of Southern Edge of Gurbantünggüt Desert[J]. 2016, 30(5): 230-234.
DOI：

FU Sihua1, 2, HU Shunjun1, et al. The Dynamic of Soil Water Utilization in Spring and Summer of Young Haloxylon ammodendron at Deep Groundwater of Southern Edge of Gurbantünggüt Desert[J]. 2016, 30(5): 230-234. DOI： 10.13870/j.cnki.stbcxb.2016.05.038.

摘要

梭梭是古尔班通古特沙漠的建群种，为研究梭梭水分利用特征及季节变化，于2014年5月和7月利用稳定性同位素技术测量了幼龄梭梭小枝木质部水、冠下0—400 cm不同土层土壤水δ18O值，采用直接对比法、平均深度模型以及Iso-Source模型对幼龄梭梭春夏季的水分来源进行分析。结果表明：幼龄梭梭冠下表层（0—70 cm）土壤含水量5月明显高于7月，70 cm及以下土层土壤含水量5月、7月相差不大；表层土壤水δ18O值变化较大，5月表层土壤水δ18O值与7月相比明显偏小；5月各土层土壤水δ18O值变化复杂，7月各土层土壤水δ18O值变化单一，随深度增加逐渐减小；幼龄梭梭5月主要利用0—50 cm土层的土壤水，利用比例达67.5%，7月则主要利用250—400 cm土层的土壤水，利用比例达94.2%。

Abstract

Water is not only an important factor limiting the survival and growth of plants

but also a factor influencing the distribution and quantity of vegetation in arid areas. Haloxylon ammodendron is a dominant plant species in the Gurbantünggüt Desert. Researching the water use pattern and seasonal changes is vital for understanding plant adaptation to environmental changes in the arid zone. In our study

the oxygen sable isotope ratios (δ18O) of xylem water and soil water in different soil layers (0—400 cm) were measured

and the water resource of young Haloxylon ammodendron in spring and summer were analyzed with direct comparison method

Iso-Source model and the mean depth of water uptake model. The results show that: (1) surface soil moisture (0—70 cm) in May was significantly higher than the surface soil moisture content in July

the difference of soil moisture content in 70—400 cm soil layer is not significant in Spring and Summer. (2) The δ18O values of surface soil water changed widely. In May

the δ18O value of surface soil water was varied and it’s significantly more negative compared with July. In July

the δ18O value of soil water gradually decreases with depth increases. (3) The mainly water resource of young Haloxylon ammodendron is the soil water in 0—50 cm soil layer in May

the use ratio is up to 67.5%. However

in July

the contribution of surface soil water decreased drastically while that deep soil water increased rapidly

the mainly water resource is the soil water in 250—400 cm soil layer in July

the use ratio is up to 94.2%.

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