Subjects: Geosciences >> Hydrology submitted time 2023-03-13 Cooperative journals: 《干旱区研究》
Abstract： The contradiction between supply and demand of congenital water shortage and acquired water supply in southern Xinjiang stems from the natural accumulation over time and the effects of human long- term production activities on the ecological environment, including its destruction. It is necessary to formulate a scientific and perfect water use plan to improve the contradiction between supply and demand. In order to assess the current state of water supply and demand in southern Xinjiang, a water resource carrying capacity evaluation index system based on the three aspects of water resources, social economy, and ecological environment was constructed using 24 indicators. The spatio-temporal evolution of water resource carrying capacity and coupling coordination between subsystems in southern Xinjiang from 2005 to 2020 was quantitatively evaluated based on the entropy weight- TOPSIS method and coupling coordination model. The results show that: (1) The overall carrying capacity of water resources in southern Xinjiang is low, and the carrying capacity of water resources in Bayingol Mongolian Autonomous Prefecture is good, however, the variation range is wide and the trend is unsteady. The overall carrying capacity of water resources in the Aksu and Kashgar regions showed a fluctuating upward trend, with similar growth rates. Compared with 2005, the comprehensive evaluation value of water carrying capacity in the two regions increased by more than 40% in 2020. The overall water carrying capacity of Kyzylsukol Autonomous Prefecture and the Hotan area showed a fluctuating and decreasing trend first and then slowly rising. The water carrying capacity of resources in the Hotan area fluctuated greatly. (2) From 2005 to 2020, the water-socio-economic-ecological environment in southern Xinjiang was in a low-level coupling stage, indicating that the degree of correlation between various subsystems was poor, and in 2020, the coupling coordination degree transitioned from serious uncoordinated to the basic uncoordinated stage, showing an overall upward trend and large upward space. Among them, Bayingol Mongolian Autonomous Prefecture has the best level of coupling and coordination between subsystems, and the type of mild dysregulation recession has increased from the mild dysregulated recession type to the endangered dysregulated recession type. The coupling coordination level in the other four states increased from the level of moderate imbalance recession to the level of mild imbalance recession. Combined with the comprehensive evaluation values of water resources, socioeconomic and ecological environment subsystems, Bayingol Mongol Autonomous Prefecture, Aksu region, and Kashgar region belong to the water resources lagging type. Kyzylsukol Autonomous Prefecture belongs to the socio-economic and ecological environment interaction lag type, and Hotan area belongs to the socio-economic lag type. (3) From the perspective of space, based on geographical differences, the coupling and coordination degree of the five prefectures in southern Xinjiang has a strong correspondence with it. The coupling coordination degree of water resources- socio-economic-ecological environment is better in the east than in the central and western regions. Bayingol Mongolian Autonomous Prefecture has the best level of coupling and coordination, and among the other four regions, Kyzylsukol Autonomous Prefecture has a slow increase in coupling and coordination due to its western border and complex geographical environment, while Aksu, Kashgar, and Hotan regions have similar change rates and stable growth trends.
Subjects: Geosciences >> Geography submitted time 2022-03-28 Cooperative journals: 《干旱区研究》
Abstract：为更加深入地了解土壤颗粒对137Cs分布的影响，选取新疆准噶尔东部地区沙土、灰棕漠土和灰漠土3种主要的土壤类型，探讨不同土壤类型及自然地理环境条件下137Cs与土壤颗粒的关系。结果表明：沙土、灰棕漠土和灰漠土均以＞50 m的颗粒占据主导地位，其占比介于51.35%~90.22%，中值粒径（D50）表现出风沙土＞灰棕漠土＞灰漠土的趋势；灰棕漠土137Cs质量活度变化范围为0.32~15.70 Bqkg-1，其土壤剖面分布与＜2 m和2~5 m的土壤颗粒具有较强的一致性；风沙土137Cs比活度的分布分别与＞50 m土壤颗粒（0~14 cm）含量及D50剖面（0~12cm）分布趋于一致，而灰漠土137Cs比活度与各粒级土壤颗粒剖面并未表现出相同的变化趋势；风沙土和灰漠土中，对137Cs质量活度影响最大的均为2~5 m粒级的土壤颗粒，而灰棕漠土中137Cs受10~50 m粒级土壤颗粒影响最大。准噶尔东部地区3种土壤类型137Cs均与土壤颗粒存在密切关系，通过土壤剖面不同粒级土壤颗粒含量预测不同剖面137Cs质量活度具有一定参考价值。
Subjects: Geosciences >> Geography submitted time 2020-12-17 Cooperative journals: 《干旱区研究》
Abstract：运用中国大陆CRI修正模型（MCM）估算了新疆准东地区27个样点的137Cs本底值，计算了沙地、裸地、耕地、林地和草地的土壤侵蚀量并对其进行验证，探讨了MCM模型在研究区的应用潜力。结果表明：（1）各样点的137Cs总量在130.10~2671.54 Bq·m-2，平均值为1076.31 Bq·m-2，研究区中部和北部土壤多属侵蚀状态，而南部土壤多属沉积状态；（2）MCM模型估算的137Cs背景值含量介于979.87~1249.60 Bq·m-2，平均值为1140.20 Bq·m-2，结果较为合理；（3）位于研究区中部的荒漠-平原区的耕地、草地和未利用地土壤侵蚀模数分别为24.66、34.30 t·hm-2·a-1和77.84 t·hm-2·a-1，表明基于MCM模型计算的土壤侵蚀模数能较好的反映研究区土壤侵蚀状况；（4）不同土地类型的土壤侵蚀模数存在显著差异，沙地>裸地>草地>耕地>林地，研究区年平均侵蚀模数75.86 t·hm-2·a-1。基于MCM模型估算的137Cs背景值在本研究区测算的土壤侵蚀模数较为合理，具有广泛的应用前景。
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