Mapping of Regional Soil Salinities in Xinjiang and Strategies for Amelioration and Management

来源 :Chinese Geographical Science | 被引量 : 0次 | 上传用户:zhyanhz
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Information on the spatial distribution of soil salinity can be used as guidance in avoiding the continued degradation of land and water resources by better informing policy makers. However, most regional soil-salinity maps are produced through a conventional direct-linking method derived from historic observations. Such maps lack spatial details and are limited in describing the evolution of soil salinization in particular instances. To overcome these limitations, we employed a method that included an integrative hierarchical-sampling strategy(IHSS) and the Soil Land Inference Model(So LIM) to map soil salinity over a regional area. A fuzzy c-means(FCM) classifier is performed to generate three measures, comprising representative grade, representative area, and representative level(membership). IHSS employs these three measures to ascertain how many representative samples are appropriate. Through this synergetic assessment, representative samples are obtained and their soil-salinity values are measured. These samples are input to So LIM, which is constructed based on fuzzy logic, to calculate the soil-forming environmental similarities between representative samples and other locations. Finally, a detailed soil-salinity map is produced through an averaging function that is linearly weighted, which is used to integrate the soil salinity value and soil similarity. This case study, in the Uyghur Autonomous Region of Xinjiang of China, demonstrates that the employed method can produce soil salinity map at a higher level of spatial detail and accuracy. Twenty-three representative points are determined. The results show that 1) the prediction is appropriate in Kuqa Oasis(R2 = 0.70, RPD = 1.55, RMSE = 12.86) and Keriya Oasis(R2 = 0.75, RPD = 1.66, RMSE = 10.92), that in Fubei Oasis(R2 = 0.77, RPD = 2.01, RMSE = 6.32) perform little better than in those two oases, according to the evaluation criterion. 2) Based on all validation samples from three oases, accuracy estimation show the employed method(R2 = 0.74, RPD = 1.67, RMSE = 11.18) performed better than the multiple linear regression model(R2 = 0.60, RPD = 1.47, RMSE = 14.45). 3) The statistical result show that approximately half(48.07%) of the study area has changed to salt-affected soil, mainly distributed in downstream of oases, around lakes, on both sides of rivers and more serious in the southern than the northern Xinjiang. To deal with this issue, a couple of strategies involving soil-salinity monitoring, water management, and plant diversification are proposed, to reduce soil salinization. Finally, this study concludes that the employed method can serve as an alternative model for soil-salinity mapping on a large scale. Information on the spatial distribution of soil salinity can be used as guidance in avoiding the continued degradation of land and water resources by better informing policy makers. However, most regional soil-salinity maps are produced through a conventional direct- linking method derived from: historic observations Such maps lack spatial details and are limited in describing the evolution of soil salinization in particular instances. To overcome these limitations, we employed a method that included an integrative hierarchical-sampling strategy (IHSS) and the Soil Land Inference Model (So LIM) To map soil salinity over a regional area. A fuzzy c-means (FCM) classifier is performed to generate three measures, including representative grade, representative area, and representative level (membership). IHSS employs these three measures to ascertain how many representative samples are appropriate. Through this synergetic assessment, representative samples are obtained and their soil-salinity v These samples are input based on fuzzy logic, to calculate the soil-forming environment similarities between representative samples and other locations. Finally, a detailed soil-salinity map is produced through an averaging function that This case study, in the Uyghur Autonomous Region of Xinjiang of China, demonstrates that the employed method can produce soil salinity map at a higher level of spatial detail and accuracy The results show that 1) the prediction is appropriate in Kuqa Oasis (R2 = 0.70, RPD = 1.55, RMSE = 12.86) and Keriya Oasis (R2 = 0.75, RPD = 1.66, RMSE = 10.92 ), that in Fubei Oasis (R2 = 0.77, RPD = 2.01, RMSE = 6.32) perform little better than in both two oases, according to the evaluation criterion. 2) Based on all validation samples from three oases,3) The statistical result show that approximately half (R2 = 0.74, RPD = 1.67, RMSE = 11.18) show better than the multiple linear regression model 48.07%) of the study area has changed to salt-affected soil, mainly distributed in downstream of oases, around lakes, on both sides of rivers and more serious in the southern than the northern Xinjiang. To deal with this issue, a couple of strategies involving soil-salinity monitoring, water management, and plant diversification are proposed, to reduce soil salinization. Finally, this study concludes that the employed method can serve as an alternative model for soil-salinity mapping on a large scale.
其他文献
约翰与乔治两个人曾经打赌。约翰说,如果自己送给乔治一个鸟笼,并且挂在乔治房中显眼的地方,那么乔治就会买只鸟回来。乔治不信,说养只鸟多麻烦啊,我肯定不会买。 John and
期刊
我们可以说南非是幸运的,世界杯的非洲首秀正在这里上演;我们也可以说世界杯是幸运的,因为有着“非洲天堂”之称的南非或许能为这场顶级的足球盛宴带来更多的惊喜和神秘。 W
司马迁老先生:近来无恙乎?我早就拜读过您的大作《史记》,为您华美的文辞和渊博的知识所折服。但是我不得不遗憾地告诉您,您老的《史记》在广为流传了两千年之后,已经面临卖
艾米丽慢吞吞地扫着厨房地上的灰尘。听到丈夫埃里克对着啤酒瓶发牢骚,她皱起了眉头。“老家伙一死,我就要离开这个鬼地方,搬到镇上去住,到他的阳台上去喝啤酒。”满嘴的花生
我国国有企业目前存在的诸多问题的根源何在?我国经济学界普遍认为关键是产权界定不清。但是,在当前企业的产权改革中,也出现了一些不正常的现象,如有些地方政府未经试点就
促纤维增生性小圆细胞瘤(DSRCT) 是一种主要发生于腹膜的特殊型高度恶性肿瘤。光镜下瘤细胞呈不规则的巢团和梁索状结构并埋没在增生的纤维结缔组织中;免疫组化显示瘤细胞具有多向分
我们的爱是溪流母亲的爱是海洋我们可以走出很远很远却走不出母亲心灵的广场——题记因为这学期开始我独自在异乡上学了,所以妈妈每周周末都要来陪我。不完全是我想妈妈,主要
周末的下午,我和外公去散步,看到街上有人卖植物种子。我突然想起科学老师教我们种花的事。于是,我买了一些向日葵的种子。  回到家里,我观察了一下院子周围的地形,找到一个既有阳光又不起眼的地方。我用手在泥土中抠了几个小洞,然后小心翼翼地把种子放了进去,仔细地盖上土,看了又看才放心地离开。  我天天都来看望它,有时给它浇浇水,有时给它松松土,盼望着种子早些发芽。有一天放学回家,我欣喜地发现向日葵种子长出
“张老师,快看黑板!”中午,我一进教室,杨赶紧跑过来说。孩子们也都吵着:“张老师,看黑板!”被他们一吵,我真是糊涂了,黑板上能有什么?值日班长辉一下子跳到黑板前指着说:“
我的儿子凯文和伊瑞克小的时候,非常调皮。在那几年里,骨折、缝针、校长给我们的告状信、撕破的牛仔裤,以及藏在他们床底下的许多来历不明、稀奇古怪的东西成为我们日常生活