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581.
582.
Michael W. Suplee Rosie Sada David L. Feldman 《Journal of the American Water Resources Association》2019,55(3):700-719
Effects of controlled nutrient additions on a prairie stream were studied using a before‐after‐control‐impact paired design. The site is in a reference condition with low soluble nitrate (NO3) and phosphate (soluble reactive phosphorus [SRP]) in summer (3 μg NO3‐N/L, 4 μg SRP/L). Nutrients were added to two reaches over the growing season at two levels (Low Dose — 39 μg NO3‐N/L and 4.4 SRP/L; High Dose — 119 μg NO3‐N/L and 15.6 μg SRP/L). Continuously measured dissolved oxygen (DO) and changes in aquatic flora were compared to an upstream Control. Enrichment led microalgae and filamentous algae to increase in density, areal coverage, and thickness, and the magnitude of the changes were largely concordant with dosing (more in the High Dose); algal growth also suppressed macrophytes in the High Dose. Enrichment caused significant increases in diel DO swings whose magnitudes were consistent with dosing level. In the High Dose, benthic algae flourished in the growing season and then senesced en masse in fall. The decomposing algae led DO to crash (ca. 0 mg/L on the bottom), but DO impacts were out‐of‐sync with peak algal growth and photosynthesis, which occurred weeks earlier. This finding provides a plausible explanation as to why high DO delta in streams impacts aquatic life even when concurrently measured DO is not low. When DO crashed, DO was longitudinally patchy, some areas having low DO near the bottom, others near saturation. Geomorphology and exposure to wind may have caused this pattern. 相似文献
583.
实施排污许可制度,是强化排污者责任、提高固定污染源环境管理效能、改善环境质量的重要制度保障。火电行业作为典型的高架固定源,先行试点实施排污许可制度。通过分析火电行业发展和环保现状,结合排污许可管理要点,简述排污许可制对火电行业发展的影响。 相似文献
584.
发展地方环保产业的思考 总被引：1，自引：0，他引：1
本文论述了发展地方环保产业的六大要素：优势、科技、龙头、基地、环境、创新。抓住了这六大要素,地方环保产业就可成为地方经济新的增长点。 相似文献
585.
文章回顾了我国环保产品认证发展的历史沿革，阐述了环保产品认证的范围、模式、特点以及环保产品认证取得的成效、作用和实现的目标。 相似文献
586.
587.
Silvia Ferramosca Roberto Verona 《Corporate Social Responsibility and Environmental Management》2020,27(1):178-203
Using a scientometric approach, this study frames the evolution of corporate social responsibility (CSR) research over a period of 46 years. It carries out a statistical‐historical analysis mapping the main topics, references, sources, and countries of publication emergent in the CSR research. We apply this combination of bibliometric analyses on a sample of 2,583 CSR studies derived from Scopus (1973–2018). These analyses illustrate the interdisciplinary character of CSR. Second, this study recognises numerous topics in the history of CSR research and demonstrates how these topics emerge, vanish, or become steady over time. Third, the patterns of evolution in terms of topics are reflected in scientific journal specialisation and country coauthorship collaborations. Finally, this research provides the latest evaluation on the state of the art in this field, highlighting the newest and hottest topics. By plotting out the evolution of CSR research, practical implications are identified. 相似文献
588.
589.
Z. Aslıgül Göçmen James A. LaGro Jr. 《Journal of Environmental Planning and Management》2016,59(8):1513-1535
Smart growth and sustainability planning have, in recent years, become central issues in planning discourse. Scholars have argued that planning capacity at the local government level is critical for smart growth planning, and that planners have a fundamental role to play in advancing local and regional sustainability. In this paper, we investigate the extent to which local planning capacity enables communities to promote more sustainable, smart growth residential development. Based on a 2013 survey of 38 county and 53 municipal governments in the state of Wisconsin, USA, this study finds that the majority of the sample communities have permitted residential developments characterized as transit-oriented, New Urbanist, mixed use, infill developments, or conservation subdivisions as alternatives to low-density, automobile-dependent conventional developments. The study also finds that jurisdictions with higher planning capacities are more likely to overcome significant barriers to more sustainable residential development. 相似文献
590.
Eric C. Merten Nathaniel A. Hemstad Randall K. Kolka Raymond M. Newman Elon S. Verry Bruce Vondracek 《Journal of the American Water Resources Association》2010,46(4):733-743
Merten, Eric C., Nathaniel A. Hemstad, Randall K. Kolka, Raymond M. Newman, Elon S. Verry, and Bruce Vondracek, 2010. Recovery of Sediment Characteristics in Moraine, Headwater Streams of Northern Minnesota After Forest Harvest. Journal of the American Water Resources Association (JAWRA) 46(4): 733-743. DOI: 10.1111/j.1752-1688.2010.00445.x Abstract: We investigated the recovery of sediment characteristics in four moraine, headwater streams in north-central Minnesota after forest harvest. We examined changes in fine sediment levels from 1997 (preharvest) to 2007 (10 years postharvest) at study plots with upland clear felling and riparian thinning, using canopy cover, proportion of unstable banks, surficial fine substrates, residual pool depth, and streambed depth of refusal as response variables. Basin-scale year effects were significant (p < 0.001) for all responses when evaluated by repeated-measures ANOVAs. Throughout the study area, unstable banks increased for several years postharvest, coinciding with an increase in windthrow and fine sediment. Increased unstable banks may have been caused by forest harvest equipment, increased windthrow and exposure of rootwads, or increased discharge and bank scour. Fine sediment in the channels did not recover by summer 2007, even though canopy cover and unstable banks had returned to 1997 levels. After several storm events in fall 2007, 10 years after the initial sediment input, fine sediment was flushed from the channels and returned to 1997 levels. Although our study design did not discern the source of the initial sediment inputs (e.g., forest harvest, road crossings, other natural causes), we have shown that moraine, headwater streams can require an extended period (up to 10 years) and enabling event (e.g., high storm flows) to recover from large inputs of fine sediment. 相似文献