中国地理科学 ›› 2014, Vol. 0 ›› Issue (6): 647-657.doi: 10.1007/s11769-014-0717-y

• 论文 • 上一篇    下一篇

Spatio-temporal Variability of Soil Water at Three Seasonal Floodplain Sites: A Case Study in Tarim Basin, Northwest China

Sven Grashey-Jansen1, Martin Kuba2, Bernd Cyffka2, Ümüt Halik2,3, Tayierjiang Aishan2,3   

  1. 1. Institute of Geography, University of Augsburg, Augsburg 86135, Germany;
    2. Applied Physical Geography, Catholic University of Eichstaett-Ingolstadt, Eichstaett 85072, Germany;
    3. Key Laboratory of Oasis Ecology, College of Resources and Environmental Science, Xinjiang University, Ürümqi 830046, China
  • 收稿日期:2013-10-23 修回日期:2014-02-21 出版日期:2014-09-27 发布日期:2014-11-10
  • 通讯作者: Sven GRASHEY-JANSEN. E-mail: sven.jansen@geo.uni-augsburg.de E-mail:sven.jansen@geo.uni-augsburg.de
  • 基金资助:

    Under the auspices of Federal Ministry of Education and Research of Germany Project-Sustainable Management of River Oases along the Tarim River (No. 01LL0918D), National Natural Science Foundation of China (No. 31270742, 31360200)

Spatio-temporal Variability of Soil Water at Three Seasonal Floodplain Sites: A Case Study in Tarim Basin, Northwest China

Sven Grashey-Jansen1, Martin Kuba2, Bernd Cyffka2, Ümüt Halik2,3, Tayierjiang Aishan2,3   

  1. 1. Institute of Geography, University of Augsburg, Augsburg 86135, Germany;
    2. Applied Physical Geography, Catholic University of Eichstaett-Ingolstadt, Eichstaett 85072, Germany;
    3. Key Laboratory of Oasis Ecology, College of Resources and Environmental Science, Xinjiang University, Ürümqi 830046, China
  • Received:2013-10-23 Revised:2014-02-21 Online:2014-09-27 Published:2014-11-10
  • Contact: Sven GRASHEY-JANSEN. E-mail: sven.jansen@geo.uni-augsburg.de E-mail:sven.jansen@geo.uni-augsburg.de
  • Supported by:

    Under the auspices of Federal Ministry of Education and Research of Germany Project-Sustainable Management of River Oases along the Tarim River (No. 01LL0918D), National Natural Science Foundation of China (No. 31270742, 31360200)

摘要:

The floodplain vegetation of the Tarim River in Northwest China is strongly influenced by irrigated agriculture. The abstraction of river water disturbs the natural dynamics of the floodplain ecosystem. The human impact on the hydrological system by bank dams and the irrigation of cotton plantings have caused adverse changes of the Tarim River and its floodplains, so the current stocks of the typical Tugai vegetation show significant signs of degradation. Field studies of soils and statistical analysis of soil moisture data have shown that the vitality of the Tugai vegetation is primarily determined by its position to the riverbank and the groundwater. There exist complex interactions between soil hydrological conditions and the vitality of the vegetation. But the availability of water is not only influenced by the groundwater level and seasonal flood events. The spatial distribution of stocks at different states of vitality seems also to be decisively influenced by physical soil properties. Our results show that the water supply of plant communities is strongly influenced by the soil texture. Spatial differences of soil moisture and corresponding soil water tensions may be the decisive factors for the zonation of vegetation. Physical soil properties control the water retention and rising of capillary water from deeper soil layers and the phreatic zone and may supply the root systems of the phreatophytic vegetation with water.

关键词: soil moisture, soil texture, soil water tensions, Tarim River, water retention

Abstract:

The floodplain vegetation of the Tarim River in Northwest China is strongly influenced by irrigated agriculture. The abstraction of river water disturbs the natural dynamics of the floodplain ecosystem. The human impact on the hydrological system by bank dams and the irrigation of cotton plantings have caused adverse changes of the Tarim River and its floodplains, so the current stocks of the typical Tugai vegetation show significant signs of degradation. Field studies of soils and statistical analysis of soil moisture data have shown that the vitality of the Tugai vegetation is primarily determined by its position to the riverbank and the groundwater. There exist complex interactions between soil hydrological conditions and the vitality of the vegetation. But the availability of water is not only influenced by the groundwater level and seasonal flood events. The spatial distribution of stocks at different states of vitality seems also to be decisively influenced by physical soil properties. Our results show that the water supply of plant communities is strongly influenced by the soil texture. Spatial differences of soil moisture and corresponding soil water tensions may be the decisive factors for the zonation of vegetation. Physical soil properties control the water retention and rising of capillary water from deeper soil layers and the phreatic zone and may supply the root systems of the phreatophytic vegetation with water.

Key words: soil moisture, soil texture, soil water tensions, Tarim River, water retention