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71.
72.
Jenny Farmer Robin Matthews Pete Smith Jo U. Smith 《Mitigation and Adaptation Strategies for Global Change》2014,19(6):863-885
Land use change on Indonesian peatlands contributes to global anthropogenic greenhouse gas (GHG) emissions. Accessible predictive tools are required to estimate likely soil carbon (C) losses and carbon dioxide (CO2) emissions from peat soils under this land use change. Research and modelling efforts in tropical peatlands are limited, restricting the availability of data for complex soil model parameterisation and evaluation. The Tropical Peatland Plantation-Carbon Assessment Tool (TROPP-CAT) was developed to provide a user friendly tool to evaluate and predict soil C losses and CO2 emissions from tropical peat soils. The tool requires simple input values to determine the rate of subsidence, of which the oxidising proportion results in CO2 emissions. This paper describes the model structure and equations, and presents a number of evaluation and application runs. TROPP-CAT has been applied for both site specific and national level simulations, on existing oil palm and Acacia plantations, as well as on peat swamp forest sites to predict likely emissions from future land use change. Through an uncertainty and sensitivity analysis, literature reviews and comparison with other methods of estimating soil C losses, the paper identifies opportunities for future model development, bridging between different approaches to predicting CO2 emissions from tropical peatlands under land use change. TROPP-CAT can be accessed online from www.redd-alert.eu in both English and Bahasa Indonesia. 相似文献
73.
The Cape bee is endemic to the winter rainfall region of South Africa where fires are an integral part of the ecology of the fynbos (heathland) vegetation. Of the 37 wild nests in pristine Peninsula Sandstone Fynbos in the Cape Point section of Table Mountain National Park that have been analyzed so far, only 22 could be accessed sufficiently to determine the existence of a propolis wall of which 68% had propolis walls which entirely enclosed their openings. The analysis of the 37 wild nests revealed that 78% occurred under boulders or in clefts within rocks, 11% in the ground, 8% in tree cavities, and 3% within shrubs. The analysis of 17 of these nests following a fire within the park revealed that the propolis walls materially protected the nests and retarded the fire with all the colonies surviving. The bees responded to the smoke by imbibing honey and retreating to the furthest recess of their nest cavity. The bees were required to utilize this honey for about 3 weeks after which fire-loving plants appeared and began flowering. Considerable resources were utilized in the construction of the propolis walls, which ranged in thickness from 1.5 to 40 mm (mean 5 mm). Its physical environment determines the nesting behavior of the Cape bee. The prolific use of propolis serves to insulate the nest from extremes of temperature and humidity, restricts entry, camouflages the nest, and acts as an effective fire barrier protecting nests established mostly under rocks in vegetation subjected to periodic fires. 相似文献
74.
The evolution and ecology of consistent behavioural variation, or personality, is currently the focus of much attention in
natural populations. Associations between personality traits and parasite infections are increasingly being reported, but
the extent to which multiple behavioural traits might be associated with parasitism at the same time is largely unknown. Here,
we use a population of great tits, Parus major, to examine whether infection by avian malaria (Plasmodium and Leucocytozoon) is associated with three behavioural traits assayed under standardized conditions. All of these traits are of broad ecological
significance and two of them are repeatable or heritable in our population. Here, we show weak correlations between some but
not all of these behavioural traits, and sex-dependent associations between all three behavioural traits and parasite infection.
Infected males showed increased problem-solving performance whereas infected females showed reduced performance; furthermore,
uninfected females were four times more likely to solve problems than uninfected males. Infected females were more exploratory
than uninfected females, but infection had no effect on males. Finally, infected males were more risk-averse than uninfected
males but females were unaffected. Our results demonstrate the potential for complex interactions between consistent personality
variation and parasite infection, though we discuss the difficulty of attributing causality in these associations. Accounting
for complex parasite-behaviour associations may prove essential in understanding the evolutionary ecology of behavioural variation
and the dynamics of host–parasite interactions. 相似文献
75.
76.
Olle Ericsson Tarja Ahola Fredrik Dahl Filip Karlsson Fredrik Persson Olof Karlberg Fredrik Roos Ida Alftrén Björn Andersson Emelie Barkenäs Ani Boghos Birgit Brandner Jenny Dahlberg Per-Ola Forsgren Niels Francois Anna Gousseva Faizan Hakamali Åsa Janfalk-Carlsson Henrik Johansson Johanna Lundgren Atefeh Mohsenchian Linus Olausson Simon Olofsson Atif Qureshi Björn Skarpås Peter Svahn Anna Sävneby Eva Åström Anna Sahlberg Aino Fianu-Jonasson Jérémie Gautier Jean-Marc Costa Bo Jacobsson Kypros Nicolaides 《黑龙江环境通报》2019,39(11):1011-1015
77.
78.
Outreach nurseries are favored conservation and social forestry tools globally, but, as with many integrated conservation
and development programs (ICDPs), they do not always produce anticipated results. A synopsis of the experience of South African
practitioners is provided in this study of 65 outreach nurseries. South African outreach nurseries frequently include financial
objectives, creating additional challenges in simultaneously attaining conservation and socioeconomic goals. Progress was
hindered by biophysical problems (e.g., lack of water, poor soils, etc.) as well as the harsh socioeconomic conditions facing
most communities in which nurseries had been established. Attaining financial viability was challenging. Business management
skills were often restricted, and few viability studies included adequate market research. Costs to community participants
were usually high, and benefits were limited. Conservation objectives were frequently lost in the struggle to attain financial
viability. The management of social processes also proved challenging. Although small scale and relatively straightforward
compared with many ICDPs, nurseries usually require substantial institutional support, including a range of technical, business,
and development services. Project time frames need to be reconsidered, as practitioners estimate that it takes 5–10 years
for nurseries to start meeting objectives, and donors and implementing agencies often operate on 2–3-year project cycles.
Detailed viability studies are essential, incorporating a social probe and an assessment of potential impacts of projects
on community participants. Progress needs to be continuously evaluated to enable institutions and community participants to
adapt to changing conditions as well as ensure that the spectrum of objectives are being achieved. 相似文献
79.
80.