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101.
Assessment of Economic and Water Quality Impacts of Land Use Change Using a Simple Bioeconomic Model 总被引:1,自引:1,他引:0
The objective of this study is to assess the economic and water quality impact of land use change in a small watershed in the Wiregrass region of Alabama. The study compares changes in water quality and revenue from agricultural and timber production due to changes in land use between years 1992 and 2001. The study was completed in two stages. In the first stage, a biophysical model was used to estimate the effect of land use change on nitrogen and phosphorus runoff and sediment deposition in the main channel; in the second stage, farm enterprise budgeting tools were used to estimate the economic returns for the changes in land use condition. Both biophysical and economic results are discussed, and a case for complex optimization to develop a decision support system is presented. 相似文献
102.
Todd AS McKnight DM Jaros CL Marchitto TM 《Environmental monitoring and assessment》2007,130(1-3):111-127
In-situ caged rainbow trout (Oncorhynchus mykiss) studies reveal significant fish toxicity and fish stress in a river impacted by headwater acid rock drainage (ARD). Stocked
trout survival and aqueous water chemistry were monitored for 10 days at 3 study sites in the Snake River watershed, Colorado,
U.S.A. Trout mortality was positively correlated with concentrations of metals calculated to be approaching or exceeding conservative
toxicity thresholds (Zn, Mn, Cu, Cd). Significant metal accumulation on the gills of fish stocked at ARD impacted study sites
support an association between elevated metals and fish mortality. Observations of feeding behavior and significant differences
in fish relative weights between study site and feeding treatment indicate feeding and metals-related fish stress. Together,
these results demonstrate the utility of in-situ exposure studies for stream stakeholders in quantifying the relative role of aqueous contaminant exposures in limiting stocked
fish survival. 相似文献
103.
104.
Partnerships between natural-area managers and the tourism industry have been suggested to contribute to sustainability in
protected areas. This article explores how important sustainability outcomes of partnerships are to their members, how well
they are realised and the features of partnerships leading to their achievement. In 21 case studies in Australia, interviews
(n = 97) and surveys (n = 100) showed that of 14 sustainability outcomes, improved understanding of protected areas values and improved biodiversity
conservation were the most important. Other highly ranked outcomes were greater respect for culture, heritage, and/or traditions;
improved quality of environmental conditions; social benefits to local communities; and improved economic viability of the
protected area. Scores for satisfaction with outcomes were, like those for importance, all high but were less than those for
importance for the majority, with improvement in quality of environmental conditions showing the largest gap. The satisfaction
score exceeded that for importance only for increased competitiveness of the protected area as a tourist destination. “Brown”
aspects of sustainability, i.e., decreased waste or energy use, were among the lowest-scoring outcomes for both importance
and satisfaction. The most important factor enabling sustainability outcomes was provision of benefits to partnership members.
Others were increased financial support, inclusiveness, supportive organisational and administrative arrangements, direct
involvement of decision makers, partnership maturity, creation of new relationships, decreased conflict, and stimulation of
innovation. Improving sustainability outcomes, therefore, requires maintaining these partnership attributes and also increasing
emphasis on reducing waste and resource use. 相似文献
105.
Julia Roll Randall J. Mitchell Robert J. Cabin & Diane L. Marshall 《Conservation biology》1997,11(3):738-746
We investigated the effects of plant density on reproduction for an insect-pollinated desert mustard (Lesquerella fendleri [Brassicaceae]). Individual reproductive success, as measured by seeds per fruit, proportion of flowers setting fruit, and total seed production, increased with the density of conspecifics within 1 m. However, including the density of conspecifics at greater distances (1–3 m) did not significantly increase the amount of variation in reproductive success explained by the regression model. This implies that processes occurring on a scale of 1 m or less have important effects on reproduction. Total seed production also was greater for high-density plants than for otherwise similar plants with a low-density of conspecifics. We argue that increased pollinator visitation is the most likely cause of this facilitation and that investigations of the effects of rarity on reproductive success should directly consider density along with more commonly used attributes such as population size and fragmentation. 相似文献
106.
Kasemy Zeinab A. Rohlman Diane S. Abdel Latif Asmaa A. 《Environmental science and pollution research international》2021,28(24):30993-31002
Environmental Science and Pollution Research - Solid waste workers are exposed to variety of injuries and diseases at work. To study health disorders among workers in the waste management field and... 相似文献
107.
Diane Van Opstal Geerke M. Eggenhuizen Marieke Joosten Karin Diderich Lutgarde Govaerts Robert-Jan Galjaard Attie Go Maarten Knapen Marjan Boter Wai Y. Cheung Nicole van Koetsveld Stefanie van Veen Walter G. de Valk Fernanda Jehee Femke de Vries Iris Hollink Lies Hoefsloot Malgorzata Srebniak 《黑龙江环境通报》2020,40(10):1338-1342
108.
Diane Van Opstal Karin E.M. Diderich Marieke Joosten Lutgarde C.P. Govaerts Joke Polak Marjan Boter Jasper J. Saris Wai Yee Cheung Stefanie van Veen Robert van de Helm Attie T.J.I. Go Maarten F.C.M. Knapen Dimitri N.M. Papatsonis Anneke Dijkman Femke de Vries Robert-Jan H. Galjaard Lies H. Hoefsloot Malgorzata I. Srebniak 《黑龙江环境通报》2018,38(12):911-919
109.
110.