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通过在中国西部地区成都平原首次开展的多目标地球化学调查，研究了深层样元素的基准值及浅层样元素的分布特征，并利用元素的分布特征判断隐伏构造和隐伏岩体；探讨了在农业地质、环境污染、人体健康、天然气预测、pH值计算等多目标的地球化学研究。 相似文献
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惰质组是煤中一种常见的显微组分。它不仅能用来鉴别成煤前植物的木炭化程度,而且还是泥炭沼泽古环境恢复的有效途径。近年来,欧洲学者利用惰质组成功推算了地史时期三叠纪—侏罗纪之交(T—J)的古火灾温度及类型,并重建了古植被类型及泥炭沼泽古生态环境变化。与其它方法相比,利用煤中惰质组含量及其反射率进行古环境恢复的工作对于植物种类繁多、沉积岩层中夹杂的煤层或煤炭、尤其对于古气候环境波动较大的地质转折时期最为理想。因此,利用惰质组的部分参数对我国含煤沉积盆地的古生态恢复以及成煤环境的研究有积极的借鉴意义。 相似文献
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Accurate pesticide exposure estimation is integral to epidemiologic studies elucidating the role of pesticides in human health. Humans can be exposed to pesticides via residential proximity to agricultural pesticide applications (drift). We present an improved geographic information system (GIS) and remote sensing method, the Landsat method, to estimate agricultural pesticide exposure through matching pesticide applications to crops classified from temporally concurrent Landsat satellite remote sensing images in California. The image classification method utilizes Normalized Difference Vegetation Index (NDVI) values in a combined maximum likelihood classification and per-field (using segments) approach. Pesticide exposure is estimated according to pesticide-treated crop fields intersecting 500 m buffers around geocoded locations (e.g., residences) in a GIS. Study results demonstrate that the Landsat method can improve GIS-based pesticide exposure estimation by matching more pesticide applications to crops (especially temporary crops) classified using temporally concurrent Landsat images compared to the standard method that relies on infrequently updated land use survey (LUS) crop data. The Landsat method can be used in epidemiologic studies to reconstruct past individual-level exposure to specific pesticides according to where individuals are located. 相似文献
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The formation of subsurface freshwater lenses on top of brackish groundwater is a fascinating hydrologic phenomenon that creates groundwater supplies of great potential value in arid regions. Information on the recharge quantity and mechanism of these lenses is both scarce and uncertain. This study examines the formation and macroscale stability of the Rawdatain freshwater lens in Kuwait, for which significant pre-development data are available. The Rawdatain is a large (150 million m3) subsurface freshwater lens overlying brackish groundwater compared to the other freshwater lenses in the Arabian Peninsula. In this study, a three-dimensional (3D) density-dependent groundwater flow model is tested against the following data targets to estimate long-term diffuse and focused groundwater recharge: (i) groundwater head, (ii) total dissolved solids (TDS) groundwater concentration, (iii) volume and vertical thickness of stored groundwater of three different water quality TDS ranges (0–700, 700–1000 and 1000–2000 mg/L) and (iv) geometrical shape features of the lens along cross-sections. To better represent the spatial variation in TDS, six different recharge zones were assigned to allocate diffuse and focused recharge conditions. Twelve recharge rate scenarios, encompassing a wide range of feasible long-term average annual recharge values (200,000–5,000,000 m3/year), were tested against the multiple targets and compared with the groundwater age of the Rawdatain lens. Based on comparison with data targets, the long-term average annual recharge is estimated to be 500,000 m3/year. Scenarios of reduced recharge, which may occur due to changes in land-use or climate, demonstrate the extremely slow response of the lens, which is in agreement with the slow development and formation of the lens (>2,000 years). Within a 100-year time frame, a 50% reduction in annual recharge reduces the lens volumes by 21, 17 and 9% for the three water quality categories, respectively. This study demonstrates the stability of freshwater lenses in arid regions and also provides methodology for similar focused rainfall recharge freshwater lenses. 相似文献
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覆盖区多目标地球化学调查数据应用前景浅析--以江苏省国土生态地球化学调查有关成果为例 总被引：6，自引：0，他引：6
多目标地球化学调查是一项基础性、公益性地质调查工作，江苏省的多目标地球化学调查是全国实施此项工程的重要组成部分，可作为覆盖区开展此项工作的一个代表。本文简介了江苏省开展多目标地球化学调查工作的基本情况，用具体实例说明了多目标地球化学调查数据在示踪人类活动对自然土壤环境的影响、研究区域地质背景对土壤环境的制约作用、开展局部土壤生态环境安全预警、指导开发利用局部富Se土壤资源等方面的初步应用效果，对江苏省多目标地球化学调查资料的应用前景及如何进一步利用好多目标地球化学调查数据的相关问题进行了专门探讨，并提出了有关建议。 相似文献
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海参花是雌海参的性腺,在海参加工过程中常被作为下脚料,但它含有丰富的营养成分和多种活性因子,本研究检测了海参花的一般营养物质、元素含量以及氨基酸组成,同时,研究了海参花水提取物和乙醇提取物对人卵巢癌OVCAR 3细胞增殖以及对其雌二醇分泌的影响。结果表明,海参花含水量为86.63%,粗蛋白、粗脂质和粗多糖（干重）占比分别为65.06%、14.82%和1.93%。共检测出17种氨基酸,总氨基酸含量为519.09 mg/kg。其中,必需氨基酸含量为197.04 mg/kg。海参花还含有多种对人体有益的元素。海参花提取物对人卵巢癌OVCAR 3细胞的增殖有明显的抑制作用,海参花水提取物、乙醇提取物均可提高细胞培养液上清液中雌二醇的含量,其中乙醇提取物可显著提高上清液中雌二醇的含量（P<0.01）。以上表明,海参花的营养丰富,其提取物能显著促进人卵巢癌OVCAR 3细胞雌二醇的分泌调节,因此具有很高的开发利用价值。 相似文献
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