Tìm thấy 18+ kết quả cho từ khóa "Forest ecosystems"
tailieu.vn Xem trực tuyến Tải xuống
In 2010,Vietnam had a forest area of over 13 million hectares (ha), which is more than twice of the country’s forest area in late 1940s. Production forests include:. Natural production forests;. Planted production forests. 3/ Special-use forests are mainly used for conservation of nature, specimens of the national forest ecosystems and forest biological gene sources. The use-rights and obligations of households differ according to the contracted forest type (Box 2 [7])..
tailieu.vn Xem trực tuyến Tải xuống
The benefits that residents benefit from the exploitation of these benefits account for a lower rate than the benefits that forest ecosystems according to residents' human resolution, with 29% of households exploiting hill ecosystem urine to irrigate crops However, compared to the perception of the benefits that forest ecosystems bring to humans, only 20% of households commented on the benefits of water supply services, as analyzed above.
tailieu.vn Xem trực tuyến Tải xuống
Small rodents play important roles in forest ecosystems as prey of carnivores. They also influence the structure and diversity of plant communities (Decocq et al., 2005. Krojerová- Prokešová et al., 2016). These mammals are forest-dwellers and the most common small rodent species in South Korea (Lee et al., 2008). The studied species prefer more open forest by forest management (Kang et al., 2013b).
tailieu.vn Xem trực tuyến Tải xuống
Proulx and Mazumder (1998) performed a meta-analysis of 44 reports of the effects of grazing on plant species richness from lake, stream, marine, grassland and forest ecosystems. Nine of the remaining 11 nutrient-rich studies showed no difference with graz- ing regime whilst two showed a decline in species richness.
tailieu.vn Xem trực tuyến Tải xuống
The following section summarises typical human impacts on forest ecosystems within different biomes, and the consequences these human impacts have for the habitat function of old-growth forests. Table 19.1 shows the impacts caused by diverse socioeconomic driving forces on the habitat function of old-growth forests in different biomes.. Table 19.1 Impacts of various anthropogenic drivers on the habitat function of old growth (OG) forest ecosystems in different biomes.
tailieu.vn Xem trực tuyến Tải xuống
What is the current condition of the ecosystems at the site?. The most important missing species in the forest ecosystems are top predators, such as the gray and red wolves that once lived here. How are human activities likely to change or influence the site’s ecology in the future?.
tailieu.vn Xem trực tuyến Tải xuống
The scientific materials were collected by state assignment of “Methodical approaches to the assessment of the structural organization and functioning of forest ecosystems” No.: АААА-А and the results of the study were processed by the supported Russian Science Foundation under project number . Spread of the earthworm Dendrobaena octaedra (Lumbricidae:. Identification of the main mechanisms of earthworm impacts on soil microarthropods. Earthworms of the western United States.
tailieu.vn Xem trực tuyến Tải xuống
In Romania, most ecological studies from forest ecosystems were focused only on moss from soil, as a component of the litter-fermentation layer (Solomon, 1980. Manu et al., 2013). Geographical description of the investigated ecosystems in Romania (https://. Some of the mites were mounted whole on glass slides in Hoyer’s medium (Krantz and Walter, 2009). Mašán et al., 2008. All identified species are in the mite collection of the Institute of Biology Ecological Station in Posada..
tailieu.vn Xem trực tuyến Tải xuống
Fine-root turnover patterns and their relationship to root diameter and soil depth in a C 14 -labeled hardwood forest. Makita N, Hirano Y, Mizoguchi T, Kominami Y, Dannoura M et al. McCormack ML, Dickie IA, Eissenstat DM, Fahey TJ, Fernandez CW et al. Mucha J, Zadworny M, Helmisaari HS, Nihlgård B, Repo T et al.. In: Sparks DL, Page AL, Helmke PA, Loeppert RH, Soltanpour PN et al. The potential effects of nitrogen deposition on fine-root production in forest ecosystems.
tailieu.vn Xem trực tuyến Tải xuống
Compared similarity index between seedling and tree species at four forest types were that, the average forest has the highest percentage of species common (76.58. The lowest was in the extremely poor forest (47.66%). The integrated knowledge of the structure, composition and plant diversity is the basis for sustainable management strategies in different forest ecosystems.
tailieu.vn Xem trực tuyến Tải xuống
Bennett et al., 2017 . but very scarce in biodiversity rich tropical forest ecosystems ( Ali et al., 2019. able to degradation than other soil types because of the high vol- ume of rainfall, acidity, and decomposition rate ( Ayala-Orozco et al., 2018. Anthropogenic disturbances, together with fragmentation, cli- mate change, and land conversion, make tropical forest topsoil highly prone to erosion with likely changes to the soil ecosystem functions ( Flores et al., 2019 .
tailieu.vn Xem trực tuyến Tải xuống
Eastern Siberia is the part of Russia that is least affected by human impact, with 39% of the forest zone still intact, followed by the Russian Far East (31% intact) and Western Siberia (25% intact). European Russia is the most affected region of Russia (9% intact) (Aksenov et al. Here we consider the original definition of ‘intact forest landscape’, which typically contains a ‘natural mosaic of forest and non-forest ecosystems’ (Yaroshenko et al.
tailieu.vn Xem trực tuyến Tải xuống
Climate change is one of the threats to functioning forest ecosystems. Beginning in the early 1990’s, natu- ral events such as hurricanes increased in frequency and intensity. On the other hand, periods of drought such as in the sum- mer of 2003 additionally weakened the resilience of forest ecosystems. Austrian forests serve as a carbon sink because of the increase in tim- ber stocks.
vndoc.com Xem trực tuyến Tải xuống
There are many factors that cause the pollution of the air: chemicals from burned fuels, (58. for the destruction of many forest ecosystems
vndoc.com Xem trực tuyến Tải xuống
There are many factors that cause the pollution of the air: chemicals from burned fuels, (8. for the destruction of many forest ecosystems
tailieu.vn Xem trực tuyến Tải xuống
In this study, focus was placed on how time had elapsed since the last overwintering activity of cormorant colonies, as a factor that affects the structure of springtail communities and edaphic parameters in the Black and Azov Sea coastal forest ecosystems.
tailieu.vn Xem trực tuyến Tải xuống
In other nature forest ecosystems where it has been possible to carry out long term fumigation with twice-normal CO 2 , the enhancement of growth has been hard to detect (Asshoff et al. Moreover, Carswell et al. (2000a) showed seedlings of two rain forest species to be rather unresponsive to twice-normal CO 2 , although a greater response was found for a (temperate) liana species by Granados and Ko¨rner (2002) and Zotz et al..
tailieu.vn Xem trực tuyến Tải xuống
Kira T, Shidei T (1967) Primary production and turnover of organic matter in different forest ecosystems of the western Pacific
tailieu.vn Xem trực tuyến Tải xuống
Figure 17.6 The relationship between average net primary productivity and average standing crop biomass for a range of ecosystems.. Figure 17.7 Annual above-ground net primary productivity (ANPP) (Mg dry matter ha − 1 year − 1 ) in stands of different ages in a subalpine coniferous forest in Montana, USA: early successional whitebark pine, late successional subalpine fir, and total ANPP.
tailieu.vn Xem trực tuyến Tải xuống
Planted forest and perennial fruit trees ecosystem is scattered in the city. Forest on land ecosystem of the city is very special including mountains belong The Hung Temple Nation Forest which is historic - cultural - environmental forest in the system special - using in Vietnam. Analyze and assess the importance of ecological services of ecosystems [1, 3, 6]. Each ecosystem of Viet Tri city has different important level of its ecological services.