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281.
Wajid Rehman S. W. H. Shah Kamran Younis Mohsan Nawaz Musa Kaleem Baloch Gulzar Hameed 《Environmental monitoring and assessment》2011,175(1-4):151-156
The fate of trace elements (like Ca, Fe, Al, Pb, K, and Cu) in various pulses (mash, mung, lentils and red kidney beans) of Pakistan has been studied. Samples were collected from two districts (Mansehra and Rawalpindi) and analyzed by wet acid digestion method using atomic absorption spectrophotometry. Experimental results show that the intensity of heavy metal accumulation in plants depends upon the type of the soil, the species of plants, the physicochemical properties of heavy metals, and their content in the soil. The obtained values were compared with the World Health Organization (WHO) standards for food quality. The grains from District Mansehra contained greater amount of trace metals as compared to those collected from District Rawalpindi. However, those values did not exceed the upper limits described by the WHO in nearly all the cases. Based on these findings, the consumption of pulses in larger amounts may easily be recommended. 相似文献
282.
Riffat Naseem Malik Sidra Rauf Ashiq Mohammad Syed-Ali-Musstjab-Akber Shah Eqani Karam Ahad 《Environmental monitoring and assessment》2011,173(1-4):325-341
In this study, residual concentration of organochlorine pesticides (OCPs) in the sediments, prey, and eggs of Bubulcus ibis were measured from three breeding heronries from the Punjab province of Pakistan. Pattern of contamination in eggs followed the order: DDTs > HCHs > heptachlor > aldrin. Overall, pesticide residual concentrations were greater in eggs of cattle egrets collected from heronry on the River Ravi. Among HCHs, ??-HCH was more prevalent in eggs, whereas DDTs followed the order: DDD > DDE > p,p ??-DDT > o,p ??-DDT. Eggshell thinning was detected which showed negative relationship with residual concentration of DDE. In prey samples, residual concentration of POPs followed the order: DDTs > HCHs > dicofol > heptachlor; however, contamination pattern in sediments followed a slightly different order: DDTs > heptachlor > dicofol > HCHs > dieldrin > aldrin. Concentration of ??-HCH was more prevalent in sediments and comparatively greater concentrations of POPs were measured in sediments collected from the River Ravi. Dicofol was found for the very first time in the biological samples from Pakistan, and its concentration was measured as relatively high in eggs from heronry from the River Chenab. Residual concentrations measured in eggs were below the levels that could affect egret populations. Biomagnification of the total OCPs through the food chain was evident in three breeding heronries. The concentration of DDE measured in eggs of the cattle egret suggests the need for monitoring this contaminant in other bird species at different trophic levels. 相似文献
283.
Manori Sheetal Shah Vijendra Soni Vandana Dutta Kasturi Daverey Achlesh 《Environmental science and pollution research international》2021,28(42):58872-58884
Environmental Science and Pollution Research - The objective of the present study was to evaluate the feasibility of pine needle biochar as a soil amendment to promote the growth of Bidens pilosa... 相似文献
284.
Jan Amin Ullah Hadi Fazal Shah Abdullah Ditta Allah Nawaz Muhammad Asif Tariq Muhammad 《Environmental science and pollution research international》2021,28(32):43417-43430
Environmental Science and Pollution Research - Soil pollution due to potentially toxic elements is a worldwide challenge for health and food security. Chelate-assisted phytoextraction along with... 相似文献
285.
Hans Schreier Sandra Brown Margaret Schmidt Pravakar Shah Bubhan Shrestha Gopal Nakarmi Khagendra Subba Susanne Wymann 《Environmental management》1994,18(1):139-150
GIS overlay techniques were used to provide a quantitative historic documentation of deforestation and land-use dynamics in
the Middle Mountains of Nepal between 1947 and 1990. Deforestation was most critical in the 1960s, but active afforestation
programs in the 1980s have reversed the process. In spite of these trends, the degradation problem is more complex. The GIS
evaluation showed that 86% of the recently afforested land is now under pine plantations located primarily at lower elevations
and moderately steep slopes. In contrast, rainfed agricultural expansion is most pronounced on acidic soils and steeper, upper
elevation sites, suggesting marginalization of agriculture. Agricultural expansion coupled with major losses of grazing land
to pine forests are the key processes pointing towards major animal feed deficits. An alternative animal feed source is suggested
through GIS using a topographically based microclimatic classification to generate a tree-planting map where the optimum ecological
conditions for selective native fodder tree species are identified. 相似文献
286.
287.
Basit Abdul Amin Noor Ul Shah Syed Tanveer Ahmad Imran 《Environment, Development and Sustainability》2022,24(9):11424-11448
Environment, Development and Sustainability - Conservation of greenbelts is the most enduringly successful and popular basic need for today to protect green land, preserve ecological landscape and... 相似文献
288.
In the present study total 21 forest stands on different aspects and locations (Hill base, mid slope and ridge top) on the
slope were studied to assess the importance of these two parameters in supporting species regeneration and biodiversity in
a mixed broadleaved forest between 380 and 850 m elevation in the Kumauau Himalayan region. A total of 36 tree species were
recorded in the forest. In all aspects the tree, sapling and shrub richness was higher at hill base stands in comparison to
mid slope and ridge top stand. Maximum tree richness (average across all aspects) was 9.7 and shrub richness was 9.3. Higher
richness at hill base may be attributed to more soil moisture and deeper soils which accumulate the hill base where the slope
steepness declines. The tree richness was higher in the northern aspect whereas southern aspect was more suitable for the
shrub species. From the present study it becomes evident that the base of the hills can support higher biodiversity and are
instrumental in supporting regeneration of several tree and shrub species in sal mixed broadleaved forest. 相似文献
289.
290.
Gauri R. Pradhan Antje Engelhardt Carel P. van Schaik Dario Maestripieri 《Behavioral ecology and sociobiology》2006,59(3):333-343
Female copulation calls are mating-associated vocalizations that occur in some species of Old World monkeys and apes. We argue
that copulation calls have two immediate functions: to encourage mating attempts by other males and to increase mate guarding
by the consort male. We hypothesize that female copulation calls have evolved under the selective pressures of risk of infanticide
and sperm competition. When male mate guarding is effective, copulation calls allow females to concentrate paternity in dominant
males and benefit from their protection against the risk of infanticide. When mate guarding is ineffective, copulation calls
may bring genetic benefits to females through facilitation of sperm competition. We present a quantitative model in which
interspecific variation in females' promiscuity predicts their tendency to use copulation calls in conjunction with mating.
The model predicts that in species with little female promiscuity, copulation calls should be rare and exhibited only in association
with mating with dominant males. In species in which females are highly promiscuous, copulation calls should be frequent and
unrelated to male dominance rank. The limited data available to test the model support its main predictions as well as the
predicted relation between copulation calls and male dominance rank.
相似文献
Dario MaestripieriEmail: |