Acta Geographica Sinica ›› 2016, Vol. 71 ›› Issue (5): 731-742.doi: 10.11821/dlxb201605003

• Climate Change • Previous Articles     Next Articles

Spatial variability of precipitation for mountain-oasis-desert system in the Sangong River Basin

Ligang XU1,2,3(), Hongfei ZHOU1,2(), Feng PAN4, Lingfeng WU1,2, Ying TANG3   

  1. 1. Xinjiang Institute of Ecology and Geography, CAS, Urumqi 830011, China
    2. Fukang Desert Ecosystem Observation and Experiment Station, Fukang 831505, Xinjiang, China
    3. The Scientific Research Institute of the Water Conservancy of Ningxia, Yinchuan 750021, China
    4. Urumqi Meteorological Satellite Ground Station, Urumqi 830011, China
  • Received:2015-12-22 Revised:2016-02-15 Online:2016-05-25 Published:2016-05-25
  • Supported by:
    Land and Resources Research Special Funds for Public Welfare Projects, No.201511047-2;China Postdoctoral Science Foundation, No.2013M542416

Abstract:

Mountain-Oasis-Desert System (MODS) is the typical landscape pattern in the inland arid area of Northwest China. We set the rainfall monitoring network in the Sangong River Basin, which is located in the middle part of northern Tianshan Mountains, southern margin of the Junggar Basin, to obtain the data of May-August rainfall for 2007-2014. Then empirical orthogonal function, fractal theory and geostatistics method were used to investigate characteristics of spatial distribution pattern and spatial variability of precipitation for the Mountain-Oasis-Desert System in arid inland areas. Results indicate that: (1) The first feature vector (contribution rates of the overall changes was 82.4%) has three load sections, namely, 70-150 km, 30-70 km and 0-30 km; accordingly, and the study area is divided into mountain area, oasis area and desert area. (2) The spatial distribution of summer precipitation presents a pattern of "overall uniformly type", which means that precipitation will increase over the whole basin, and the increase range is decreasing from mountain, oasis to desert. (3) The semi variation function curve of the mountainous region fits the Gauss model, the oasis area fits the Spherical model and the variation distance is 15.3 km. The desert area in May, June and other months fits the Gauss model, the exponential model and the spherical model respectively, and the variation distance is 58.6 km, which is longer than that of the mountain and oasis. (4) In research scale, owing to the random factors arising precipitation spatial heterogeneity take up 0.01%-9.57% of all, it was mainly caused by autocorrelation. (5) The spatial variability of precipitation in the oasis region was the largest, while that of the desert region was the smallest. The spatial heterogeneity of precipitation in June was the most significant, while the minimum value was observed in August. The variation was the greatest in both the north-south (0°) and the southeast-northwest directions (135°).

Key words: mountain-oasis-desert system, Sangong River Basin, precipitation, spatial variability, kriging method