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Jiao Yang Xu Lei Li Qingman Gu Sen 《Environmental science and pollution research international》2020,27(7):7156-7165
Environmental Science and Pollution Research - Capping water body sediments with a thin layer of sand is an effective technique to decrease nutrient concentrations in the water column and... 相似文献
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Han Yanqing Gu Jiao Li Qisheng Zhang You He Hu Shen Ruijie Li Kuanyi 《Environmental science and pollution research international》2020,27(34):42198-42209
Environmental Science and Pollution Research - Rapid expansion of juvenile fish after biomanipulation can delay the successful restoration of submerged macrophytes, leading to a turbid water status... 相似文献
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Hui Xue Xiaoyi Ren Shiyu Li Xu Wu Hao Cheng Bin Xu Baojing Gu Guofu Yang Changhui Peng Ying Ge Jie Chang 《Environmental monitoring and assessment》2013,185(10):8501-8516
Tea plantations are rapidly expanding in China and other countries in the tropical and subtropical zones, driven by relatively high private economic benefit. However, the impact of tea plantations on the regional environment, including ecosystem services and disservices are unclear. In this study, we developed an assessment framework for determining the private economic benefits and environmental externalities (the algebraic sum of the regulating services and disservices) of tea plantations in China. Our results showed that tea plantations provided private economic benefits of 5,652 yuan ha?1 year?1 (7.6 yuan?=?1 USD in 2007) for tea farmers, plus positive environmental externalities of 6,054 yuan ha?1 year?1 for the society. The environmental externalities were calculated as the sum of the value of four regulating services, including carbon sequestration (392 yuan ha?1 year?1); soil retention (72 yuan ha?1 year?1); soil fertility protection (3,189 yuan ha?1 year?1) and water conservation (2,685 yuan ha?1 year?1), and three disservices, including CO2 emission (?39 yuan ha?1 year?1), N2O emission (?137 yuan ha?1 year?1) and nonpoint source pollution (?108 yuan ha?1 year?1). Before the private optimal level, the positive environmental externalities can be maintained by private economic benefits; if a social optimal level is required, subsidies from government are necessary. 相似文献
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The availability of the five chemical fractions, i.e., exchangeable (F1), carbonate-bound (F2), Fe/Mn oxide-combined (F3), organic matter-complexed (F4), residual (F5), of three heavy metals (Cu, Zn, and Cd), has been investigated by way of a sequential extraction technique based on the characteristics of the coastal soils developed from alluvial deposits, in order to analyze the relationship of the formation and development of coastal soils. The results showed that F1 and F5 of Cu, Zn, and Cd accounted dominantly for 9.11%, 2.74%, and 20.37%, and for 39.49%, 45.18%, and 32.43% of total heavy metal contents, respectively, indicating the order of availability and mobility: Cd > Cu > Zn. F2, F3, and F4 of HMs also featured prominently in the behaviors of heavy metals. Random measurement errors from both sampling and analysis were demonstrated by SAX to be well within the control target of 20% and, therefore, of no impediment to the geochemical interpretation of the data. Significant positive correlation was found between certain fractions of heavy metals and some soil properties. Some negative correlation was also found. The findings were helpful to the soil remediation, fertility adjustment, and plant cultivation. 相似文献
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将地理信息系统技术应用于污水计量装置管理中,建立拓扑关系,实现窄间分析和输出显示,以达到计量装裁管理自动化、规范化和标准化的目的,为管理和决策提供准确、及时、动态、全面的信息。 相似文献
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本文模拟并计算了穿着状态下防静电无尘服肘部所受到的张力作用,以确定在穿用过程中服装受到的最大作用力。根据模拟计算结果,对在穿着状态下肘部张力对防静电服功能性的影响进行了实验研究,并对降低服装穿着时张力对性能的不良影响,提出了改进方法和建议。 相似文献