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排序方式: 共有111条查询结果,搜索用时 203 毫秒
101.
Carbon emission from farm operations 总被引:42,自引:0,他引:42
Lal R 《Environment international》2004,30(7):981-990
102.
R. Lal 《Agriculture, ecosystems & environment》1984,11(2):188-189
103.
Jawahar Lal Tiwari John E. Hobbie James P. Reed Donald W. Stanley Michael C. Miller 《Ecological modelling》1978,4(1):3-27
A set of stochastic differential equations has been used to model an aquatic ecosystem. The randomness in the system has been introduced through initial conditions of the state variables, parameters, and input variables (light and temperature). These models were analysed using Monte Carlo simulation procedures and the results were similar to those observed in the experimental and field data. They were different, however, from the results of a deterministic simulation. This approach allows us to incorporate the maximum degree of information in the model and to study the behavior of the system without arbitrarily manipulating the values of the parameters. Some possible refinements and generalizations of this approach are also discussed. 相似文献
104.
Socio-economic impacts of climate change on rural United States 总被引:4,自引:4,他引:0
Pankaj Lal Janaki R. R. Alavalapati Evan D. Mercer 《Mitigation and Adaptation Strategies for Global Change》2011,16(7):819-844
Directly or indirectly, positively or negatively, climate change will affect all sectors and regions of the United States.
The impacts, however, will not be homogenous across regions, sectors, population groups or time. The literature specifically
related to how climate change will affect rural communities, their resilience, and adaptive capacity in the United States
(U.S.) is scarce. This article bridges this knowledge gap through an extensive review of the current state of knowledge to
make inferences about the rural communities vulnerability to climate change based on Intergovernmental Panel on Climate Change
(IPCC) scenarios. Our analysis shows that rural communities tend to be more vulnerable than their urban counterparts due to
factors such as demography, occupations, earnings, literacy, poverty incidence, and dependency on government funds. Climate
change impacts on rural communities differs across regions and economic sectors; some will likely benefit while others lose.
Rural communities engaged in agricultural and forest related activities in the Northeast might benefit, while those in the
Southwest and Southeast could face additional water stress and increased energy cost respectively. Developing adaptation and
mitigation policy options geared towards reducing climatic vulnerability of rural communities is warranted. A set of regional
and local studies is needed to delineate climate change impacts across rural and urban communities, and to develop appropriate
policies to mitigate these impacts. Integrating research across disciplines, strengthening research-policy linkages, integrating
ecosystem services while undertaking resource valuation, and expanding alternative energy sources, might also enhance coping
capacity of rural communities in face of future climate change. 相似文献
105.
Chawla Kanhaiya Yadav Deepak Kumar Bajpai Abhinav Kumar Sushant Lal Chhagan 《Environmental science and pollution research international》2021,28(4):3872-3879
Environmental Science and Pollution Research - The high de-/hydrogenation temperature of magnesium hydride is still a challenge in solid-state hydrogen storage system for automobiles applications.... 相似文献
106.
Vishwakarma Dinesh Kumar Ali Rawshan Bhat Shakeel Ahmad Elbeltagi Ahmed Kushwaha Nand Lal Kumar Rohitashw Rajput Jitendra Heddam Salim Kuriqi Alban 《Environmental science and pollution research international》2022,29(55):83321-83346
Environmental Science and Pollution Research - Dams significantly impact river hydrology by changing the timing, size, and frequency of low and high flows, resulting in a hydrologic regime that... 相似文献
107.
Soil carbon and nitrogen in 28-year-old land uses in reclaimed coal mine soils of Ohio 总被引:1,自引:0,他引:1
Carbon (C) and nitrogen (N) play an important role in the restoration of ecosystem functions of reclaimed mine soils (RMSs). Postreclamation land use in RMSs affects soil C and N pools and fluxes. We compared the effects of 28-yr-old postreclamation land uses (forest, hay, and pasture) on selected chemical properties of soil, and C and N pools in reference to undisturbed forest and moderately disturbed agricultural land use in southeastern Ohio. The electrical conductivity was higher in RMSs under hay than that in pasture and forest land uses. The RMSs under pasture, hay, and forest had moderately acidic, neutral to slightly alkaline, and slightly alkaline pH, respectively. In the 0- to 5-cm soil depth, soil organic C (SOC) was higher in RMSs under pasture by 99% and under hay by 52% over that under forest. Similarly, total nitrogen (TN) was higher in RMSs under pasture by 98% and under hay by 43% over that under forest. Aggregate-associated SOC concentration in the 0- to 5-cm depth decreased in the order of RMSs under hay > RMSs under pasture > RMSs under forest. The SOC pools in the 0- to 30-cm depth decreased in the order of RMSs under hay = RMSs under pasture > RMSs under forest = undisturbed forest = agriculture land use. Nitrogen pools followed a similar trend. Hay land use has a better potential for improving soil quality in RMSs by enhancing chemical properties and SOC and TN pools than forest or pasture land uses. 相似文献
108.
Pazou EY Boko M van Gestel CA Ahissou H Lalèyè P Akpona S van Hattum B Swart K van Straalen NM 《Environment international》2006,32(5):616-623
The Ouémé River is one of the most important rivers in the Republic of Bénin. It is 510 km long and its catchment drains 75% of the country. In this study, organochlorine and organophosphorous pesticide residues were measured in more than 35 sediment samples collected on nine locations along the Ouémé River from upstream to downstream. Except for one location, Tanéka-Koko, all areas were contaminated by more than 20 pesticides. Organochlorine pesticides identified in sediment samples included pp'-DDE, op'-DDD, pp'-DDD, op'-DDT, pp'-DDT, alpha-endosulfan, beta-endosulfan, endosulfan sulphate, alpha-HCH, beta-HCH, lindane, aldrin, dieldrin, endrin, telodrin, isodrin, cis- and trans-heptachlorepoxide, hexachlorbutadiene, hexachlorobenzene and octachlorostyrene. The organophosphorous pesticide chlorpyrifos, used in a new formulation to protect cotton, was also identified. In some areas, the concentrations of organochlorine pesticides in the sediment of the Ouémé River exceeded environmental quality standards and are reason for concern. 相似文献
109.
Contamination of fish by organochlorine pesticide residues in the Ouémé River catchment in the Republic of Bénin 总被引:2,自引:0,他引:2
Pazou EY Lalèyè P Boko M van Gestel CA Ahissou H Akpona S van Hattum B Swart K van Straalen NM 《Environment international》2006,32(5):594-599
In the Republic of Bénin, aquatic ecosystems are subject to poisoning risks due to the inappropriate use of pesticides, such as washing of empty bottles in rivers and using pesticides to catch fish. In some areas, cotton fields are located near riverbanks, increasing the probability of pesticide emission to the river. To assess contamination levels in the Ouémé River catchment area, different fish species were collected from different geographical areas along the river. DDT, its metabolites and isomers were the most frequently identified pesticides in fish flesh, alpha-endosulfan, beta-endosulfan, dieldrin, telodrin, lindane and octachlorostyrene were also detected. Concentrations of pesticide residues in fish ranged from 0 to 1364 ng/g lipid. A preliminary risk assessment indicated that the daily intake of chlorinated pesticides by people consuming fish from the Ouémé River still is rather low and does not present an immediate risk. 相似文献
110.
Kan Zheng-Rong Han Shou-Wei Liu Wen-Xuan Zhao Xin Lal Rattan Zhang Hai-Lin 《Environmental Chemistry Letters》2022,20(1):101-107
Environmental Chemistry Letters - In the context of climate change, soil is a major pool of stable carbon on earth, yet knowledge on soil carbon turnover is limited. The difference in 13C/12C... 相似文献