The influences of land-use changes on the absorbed nitrogen and phosphorus loadings in the drainage basin of Lake Chaohu,China   总被引：1，自引：0，他引：1  

Tiantian Jiang  Shouliang Huo  Beidou Xi  Jing Su  Haobo Hou  Hong Yu  Xiang Li 《Environmental Earth Sciences》2014,71(9):4165-4176

The influences of land-use changes on the absorbed nitrogen and phosphorus loadings in the drainage basin of Lake Chaohu were investigated in this study. Based on the principle of universal soil loss equation, a model was developed for estimating the annual mean soil erosion amount from 1989 to 2008 in Chaohu basin. Applying the GIS and soil data, the absorbed nitrogen and phosphorus loadings were stimulated and quantified for three-time stage (1989–1995, 1996–2000, 2001–2008). Furthermore, the influences of historical land-use changes on the absorbed nitrogen and phosphorus loadings were assessed. The results indicated that the absorbed nitrogen and phosphorus loadings of drainage basin have an obvious spatial difference in the three-time stage because of the different characteristics of climate and geology. Temporally, the absorbed nitrogen and phosphorus loadings in the second stage (1996–2000) are less than the one in the first (1989–1995) and third stage (2001–2008), and the load of third stage is the largest, which was mainly impacted by rainfall and land-use change. Forest and grass can act as a source for the load of absorbed nitrogen or absorbed phosphorus. The paddy land and residential land in these areas act as sinks or transformation zones as expected. Other factors such as slope and geology also play important roles in the transport of nutrients and sediments to streams.  相似文献   

柴达木盆地周缘镍矿床(点)成矿特征及找矿潜力分析          下载免费PDF全文

雷延军  黄朝晖  刘长财  张开成  王红英  雷爱全 《中国地质调查》2017,4(4):9-16

近年来,在青海柴达木盆地周缘(简称柴周缘)地区陆续发现了一系列与超基性岩体有关的镍矿床(点)。为此,根据已有地质矿产资料,通过综合研究分析,总结了柴周缘地区镍铜硫化物矿床的成矿地质背景、空间分布及成矿特征; 在柴周缘地区划分出柴北缘高压混杂岩带、欧龙布鲁克陆块、柴南缘昆北裂陷槽及柴南缘昆中岩浆弧带等4个镍成矿区带,并重点分析了各成矿区带的镍矿床(点)成矿特征; 在此基础上,总结了柴周缘镍矿床的幔源岩浆深部熔离和上侵贯入的成矿模式及含矿岩石风化露头和物化探异常等找矿标志,圈定出柴北缘高压混杂岩带西段的阿尔金南缘茫崖镇—冷湖镇、欧龙布鲁克陆块东段的乌兰、柴南缘昆北裂陷槽西段的冰沟南和东段的夏日哈木西北,以及柴南缘昆中岩浆弧带中段的夏日哈木—托拉海南和白日其利—哈图6处镍矿找矿潜力区。所取得的地质找矿效果,对推动整个柴周缘地区与超基性岩体有关的镍矿的勘查工作具有重要意义。  相似文献   

东莞市工程建设项目联合测绘思路及模式探讨     

刘凯程  徐启恒 《测绘与空间地理信息》2022,45(4):219-222

通过对东莞市工程建设项目联合测绘体系架构、业务流程、成果共享共用以及现有模式的优缺点等方面详细描述,全面阐述了东莞市联合测绘项目的总体建设情况,同时指出了东莞市联合测绘项目的特色特点和运行机制,为东莞市联合测绘项目的进一步提效增速、工程项目成本压缩等提供了重要参考,也为其他地市的联合测绘工作提供了具体实践参考。  相似文献