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• 干旱区盐碱土碳过程专栏 • 上一篇    下一篇

干旱区内陆河流域尾闾绿洲土壤盐渍化动态预测

刘丽娟,王玉刚**,唐立松   

  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室, 乌鲁木齐 830011)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Dynamic predication of soil salinization in an oasis at lower reaches of inland river basin, Xinjiang of Northwest China.

LIU Li-juan, WANG Yu-gang**, TANG Li-song   

  1. (State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China)
  • Online:2013-10-10 Published:2013-10-10

摘要:

针对干旱区尾闾绿洲土壤盐渍化严重发生的现状,运用遥感和GIS技术,基于天山北麓三工河流域平原尾闾绿洲农区0~20 cm耕作层土壤盐渍化特征,利用空间概率模型预测了其今后的发生状态。结果表明:经过长时间的土地利用,土壤盐渍化程度有所加剧;通过空间概率模型χ2检验,1982—2005年的转移概率模拟值与实际值可靠性要高于1982—1999年的转移概率。模型模拟结果显示,2010年以后到达稳定状态,人工景观的面积增加,自然景观的面积减少,其中轻盐化耕地面积减少,中盐化和重盐化耕地面积增加,在长时间范围内,土壤盐渍化依旧是制约研究区绿洲耕地生产力的主要因素。
 

关键词: 水分来源, 荒漠生境, 泡泡刺, 降水变化, 稳定同位素

Abstract: Aiming at the serious soil salinization in arid oasis, GIS and RS techniques were adopted to study the salinization characteristics in topsoil (0-20 cm) in an oasis at the lower reaches of the Sangong River Basin in the northern piedmont of the Tianshan Mountains in Xinjiang of Northwest China, and a spatial probability model was used to predict the dynamic status of the soil salinization. After a long-term land use process, the soil salinization in the study area aggravated to some extent, and the area of soil salinization was enlarged. The χ2test of spatial probability model revealed that the simulated value of transition probability and the measured value were more reliable during the period of 1982-2005 than during the period of 1982-1999. The simulated results of spatial probability model showed that after 2010, the area of natural landscapes was reduced, but that of artificial ones was enlarged, in which, the area of slight soil salinization was decreased, but that of moderate and serious soil salinization showed an opposite pattern. It was considered that within a long period, soil salinization would be still a key factor limiting the cropland productivity in the study area.

Key words: precipitation variation, water source, desert habitat, Nitraria sibirica., stable isotope