排序方式: 共有7条查询结果,搜索用时 15 毫秒
1
1.
2.
A cover with capillary barrier effects (CCBE) was constructed in 1998 on the abandoned Lorraine mine tailings impoundment to limit the generation of acid mine drainage. The Ministry of Natural Resources and Fauna of Quebec (MRNF) is responsible for the site and for all restoration works on it, including CCBE construction. The CCBE is made up of three layers: a 0.3-m layer of sand used as a support and capillary break layer; a moisture-retaining layer with a thickness of 0.5 m (this layer is constructed of a nonplastic silt); and a 0.3-m sand and gravel layer on top. The main objective of the CCBE is to maintain one (or more) of the layers at a high degree of water saturation to impede oxygen migration and acid generation. Vegetation succession on the Lorraine CCBE results in an improvement in soil conditions, leading to the installation of deep-rooted species, which could represent a risk to CCBE long-term performance. Hence, the characterization of vegetation succession is an important aspect of the monitoring strategy for the Lorraine CCBE. Species occurrence was documented, and depth of tree roots was measured by excavation on a regular basis. Eight functional groups of plants were identified; herbaceous plants were the most abundant ecological plant groups. Tree ring counts confirmed that tree colonization started the year of CCBE construction (1999). Of the 11 tree species identified, the most abundant were poplar (Populus spp.), paper birch (Betula payrifera Marsh.), black spruce (Picea mariana Mill.), and willow (Salix spp.). Significant differences in occurrence related to environmental conditions were observed for most functional groups. Root excavation showed that tree roots exceeded the depth of the protective layer and started to reach the moisture-retaining layer; in 2008, root average depth was 0.4 m and the maximal root depth was 1.7 m. 相似文献
3.
Liu Enke Zhou Jie Yang Xiao Jin Tao Zhao Bingqiang Li Lili Wen Yanchen Soldatova Evgeniya Zamanian Kazem Gopalakrishnan Subramaniam Mei Xurong Kuzyakov Yakov 《Environmental Chemistry Letters》2023,21(2):663-671
Environmental Chemistry Letters - Soil carbon is major driver of climate in the long term because soil can either decrease global warming by carbon sequestration or increase warming by... 相似文献
4.
Soldatova Evgeniya Sun Zhanxue Maier Sofya Drebot Valeriia Gao Bai 《Environmental geochemistry and health》2018,40(5):2223-2242
Environmental Geochemistry and Health - Owing to their accessibility, shallow groundwater is an essential source of drinking water in rural areas while usually being used without control by... 相似文献
5.
I. N. Soldatova 《Marine Biology》1986,92(1):115-123
Quantitative indices of feeding, food assimilation, energy metabolism and growth in Pontogammarus maeoticus (Sow.) from the Azov Sea (12‰S) were studied from the salinity levels. Juveniles and males of different age groups were sampled for experiments. The relationships between feeding rate (C) and energy metabolism (R) on an energy equivalent of w, body weight were approximated by the power equations \(C = C_1 w^{b_c }\) and R=R1wb. To express weight growth, the Bertalanffy equation and its solution were used: $$\frac{{dw}}{{dt}} = Nw^q - kw; w(t) = W_\infty (1 - e^{ - mkt} )^{1/m}$$ Under control salinity (12‰S) the following parameters were obtained: C1=0.73J(1-b)d-1; bc=0.62; R1=0.53J(1-b)d-1; b=0.67. The application of a new method suggested by the author for determining the growth parameters, N, k, m=1-q, revealed their dependence on age. For juveniles N=0.0965, k=0.0046, while for adults the respective values were 0.1540 and 0.0181. The value m=0.39 was the same for both age classes. The individuals were gradually transferred to conditions of changed salinity (~0; 4 and 18‰S). The observations lasted up to two months. Through the entire range of salinity (~0–18‰S), food assimilation alone was constant. In relation to dry matter, food assimilation was 65 and 80% in terms of caloric value. The other indices under study remain at the control level only under desalinization to 4‰S. When P. maeoticus was maintained in fresh water, the juveniles showed enhanced levels of nutrition, energy metabolism and increment, while in mature individuals the respective parameters decreased compared with the control. As a result, the parameters C1 and R1 in the functions C(w) and R(w) were ~2 times higher and bc and b~2 times lower than in 12‰S. An increase in salinity to 18‰S resulted in a decline of all the processes concerned: C1=0.61, R1=0.36, bc and b remained at the control level, while growth rate became 20% lower. A full compensation type acclimation for P. maeoticus is possible with the salinity range (12–4‰S) where the individual can maintain ionic balance. 相似文献
6.
E. V. Shuyskaya L. G. Gismatullina K. H. Toderich P. Yu. Voronin N. V. Soldatova 《Russian Journal of Ecology》2012,43(4):302-306
Populations of Haloxylon àphyllum in the Kyzylkum Desert have been found to be markedly deficient in heterozygotes at a medium level of genetic diversity (P 95 = 0.56, A = 1.67, H o = 0.14, H e = 0.28). Spatial genetic differentiation of these populations have been revealed along a soil salinity gradient (from 0 to 0.5 mmol Na+/g), with their genetic diversity reaching a maximum (H o = 0.21?C0.25, H e = 0.25?C0.27) in areas with a moderate salinity level (0.05?C0.1 mmol Na+/g). Locus Got-2 can serve as a marker of this differentiation (FstGot-2 = 0.4). 相似文献
7.
Efremova KO Volodin IA Volodina EV Frey R Lapshina EN Soldatova NV 《Die Naturwissenschaften》2011,98(11):919-931
In goitred gazelles (Gazella subgutturosa), sexual dimorphism of larynx size and position is reminiscent of the case in humans, suggesting shared features of vocal
ontogenesis in both species. This study investigates the ontogeny of nasal and oral calls in 23 (10 male and 13 female) individually
identified goitred gazelles from shortly after birth up to adolescence. The fundamental frequency (f0) and formants were measured
as the acoustic correlates of the developing sexual dimorphism. Settings for LPC analysis of formants were based on anatomical
dissections of 5 specimens. Along ontogenesis, compared to females, male f0 was consistently lower both in oral and nasal
calls and male formants were lower in oral calls, whereas the first two formants of nasal calls did not differ between sexes.
In goitred gazelles, significant sex differences in f0 and formants appeared as early as the second week of life, while in
humans they emerge only before puberty. This result suggests different pathways of vocal ontogenesis in the goitred gazelles
and in humans. 相似文献
1