scholarly journals Vegetation Heterogeneity Effects on Soil Macro-Arthropods in an Alpine Tundra of the Changbai Mountains, China

Plants ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 418 ◽  
Author(s):  
Yan Tao ◽  
Zhongqiang Wang ◽  
Chen Ma ◽  
Hongshi He ◽  
Jiawei Xu ◽  
...  
Keyword(s):  
Sampling Period ◽  
Taxonomic Composition ◽  
Alpine Tundra ◽  
Changbai Mountains ◽  
Arthropod Communities ◽  
Vaccinium Uliginosum ◽  
Deyeuxia Angustifolia ◽  
Vegetation Heterogeneity ◽  
Heterogeneity Effects ◽  
Rhododendron Aureum

The harsh environmental conditions in alpine tundra exert a significant influence on soil macro-arthropod communities, yet few studies have been performed regarding the effects of vegetation heterogeneity on these communities. In order to better understand this question, a total of 96 soil macro-arthropod samples were collected from four habitats in the Changbai Mountains in China, namely, the Vaccinium uliginosum habitat, Sanguisorba sitchensis habitat, Rhododendron aureum habitat, and Deyeuxia angustifolia habitat. The results revealed that the taxonomic composition of the soil macro-arthropods varied among the habitats, and that dissimilarities existed in these communities. The abundance, richness and diversity in the D. angustifolia habitat were all at their maximum during the sampling period. The vegetation heterogeneity affected the different taxa of the soil macro-arthropods at various levels. In addition, the vegetation heterogeneity had direct effects not only on soil macro-arthropod communities, but also indirectly impacted the abundance, richness and diversity by altering the soil fertility and soil texture. Overall, our results provide experimental evidence that vegetation heterogeneity can promote the abundance, richness and diversity of soil macro-arthropods, yet the responses of soil macro-arthropods to vegetation heterogeneity differed among their taxa.

scholarly journals Soil Mesofauna Respond to the Upward Expansion of Deyeuxia purpurea in the Alpine Tundra of the Changbai Mountains, China

Plants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 615
Author(s):  
Yan Tao ◽  
Zhongqiang Wang ◽  
Chen Ma ◽  
Hongshi He ◽  
Jiawei Xu ◽  
...  
Keyword(s):  
Northeast China ◽  
Taxonomic Composition ◽  
Alpine Tundra ◽  
Changbai Mountains ◽  
Herbaceous Plant ◽  
Native Plant ◽  
Soil Mesofauna ◽  
Faunal Communities ◽  
Low Altitude ◽  
Different Levels

Deyeuxia purpurea, a low-altitude species, has been expanding upwards into alpine tundra, and this upward expansion is causing serious ecological consequences. However, few studies have been performed regarding its effects on soil faunal communities. We examine how the upward expansion of D. purpurea affects the abundance, richness, and diversity of soil mesofauna, and evaluate how different taxa of soil mesofauna respond to the upward expansion of D. purpurea in the alpine tundra of Changbai Mountains, northeast China. A total of 128 soil mesofaunal samples were collected from four treatments, namely high upward expansion (HU), medium upward expansion (MU), low upward expansion (LU), and native plant habitats (NP). The results revealed that the abundance of soil mesofauna was increased with the rise of D. purpurea upward expansion, and the taxonomic composition varied with the different levels of D. purpurea upward expansion in the alpine tundra of the Changbai Mountains. No unique taxa were collected in the native plant habitats, and the upward expansion of D. purpurea promoted the colonization of predatory invertebrates. Isotomidae and Gamasida responded positively to the herbaceous plant upward expansion, and thus they were considered to be a positive indicator of upward expansion. Hypogastruridae and Enchytraeidae responded relatively negatively, while Oribatida, Actinedida, and Pseudachorutidae had ambivalent responses to the upward expansion. Overall, the abundance of soil mesofauna can indicate the levels of the upward expansion of D. purpurea. Soil mesofaunal guild characteristics were altered by the upward expansion. The different taxa of soil mesofauna responded to herbaceous plants’ upward expansion to various degrees. Therefore, this study provide evidence supporting the fact that the abundance of soil mesofauna can indicate the levels of upward expansion of D. purpurea, but the responses of soil mesofauna to the upward expansion of D. purpurea differ among their taxa.

scholarly journals Comparison of arthropod communities between high and low input maize farms in Mexico

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
E. del-Val ◽  
E. Ramírez ◽  
M. Astier
Keyword(s):  
Sustainable Agriculture ◽  
Management Practices ◽  
Agricultural Practices ◽  
Sampling Period ◽  
Arthropod Communities ◽  
Arthropod Diversity ◽  
Low Input ◽  
Intensive Farming ◽  
Arthropod Predators ◽  
Animal Communities

Abstract Background Animal communities are vulnerable to agricultural practices. Intensive farming considerably reduces overall arthropod diversity, but not necessarily pest abundance. Natural control of herbivores in agroecosystems is accomplished by predators and parasitoids, but in intensified agricultural regimes, the chemical control used to reduce pest abundances also affects pests’ natural enemies. To achieve more sustainable agriculture, there is a need to better understand the susceptibility of predators to conventional management. Methods In order to quantify the arthropod diversity associated with different schemes of agricultural management of maize, we evaluated agricultural fields under two contrasting management regimens in Michoacán, México during the spring–summer cycle of 2011. Arthropod communities were evaluated in plots with conventional high-input versus low-input agriculture in two sites—one rainfed and one with irrigation. The experimental units consisted of twelve 1 ha agricultural plots. To sample arthropods, we used 9 pitfall traps per agricultural plot. Results During the sampling period, we detected a total of 14,315 arthropods belonging to 12 Orders and 253 morphospecies. Arthropod community composition was significantly different between the sites, and in the rain-fed site, we also found differences between management practices. Predators, particularly ants, were more abundant in low-input sites. Herbivory levels were similar in all fields, with an average of 18% of leaf area lost per plant. Conclusions Our results suggest that conventional farming is not reducing herbivore abundances or damage inflicted to plants, but is affecting arthropod predators. We discuss repercussions for sustainable agriculture.

Carbon storage and flux for alpine tundra ecosystems in Changbai Mountains, Northeast China

2007 ◽  
Vol 18 (2) ◽  
pp. 109-113
Author(s):  
Yong-xiang Wang ◽  
Jing Wei ◽  
Ping Jiang ◽  
Gang Wu ◽  
Hong-chang Wang
Keyword(s):  
Carbon Storage ◽  
Northeast China ◽  
Alpine Tundra ◽  
Changbai Mountains ◽  
Tundra Ecosystems

scholarly journals Topographic Controls on Vegetation Changes in Alpine Tundra of the Changbai Mountains

Forests ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 756 ◽  
Author(s):  
Miaomiao Wu ◽  
Hong He ◽  
Shengwei Zong ◽  
Xinyuan Tan ◽  
Haibo Du ◽  
...  
Keyword(s):  
High Altitude ◽  
Vegetation Change ◽  
Vegetation Index ◽  
Scale Effects ◽  
Alpine Tundra ◽  
Changbai Mountains ◽  
Vegetation Changes ◽  
Tundra Vegetation ◽  
Topographic Controls ◽  
Low Altitude

The vegetation of alpine tundra is undergoing significant changes and topography has played a significant role in mediating such changes. The roles of topography varied at different scales. In this study, we intended to identify topographic controls on tundra vegetation changes within the Changbai Mountains of Northeast China and reveal the scale effects. We delineated the vegetation changes of the last three decades using the normalized difference vegetation index (NDVI) time series. We conducted a trend analysis for each pixel to reveal the spatial change and used binary logistic regression models to analyze the relationship between topographic controls at different scales and vegetation changes. Results showed that about 30% of tundra vegetation experienced a significant (p < 0.05) change in the NDVI, with 21.3% attributable to the encroachment of low-altitude plants resulting in a decrease in the NDVI, and 8.7% attributable to the expansion of tundra endemic plants resulting in an increase in the NDVI. Plant encroachment occurred more severely in low altitude than in high altitude, whereas plant expansion mostly occurred near volcanic ash fields at high altitude. We found that plant encroachment tended to occur in complex terrains and the broad-scale mountain aspect had a greater effect on plant encroachment than the fine-scale local aspect. Our results suggest that it is important to include the mountain aspect in mountain vegetation change studies, as most such studies only use the local aspect.

scholarly journals Caractérisation de la flore phytoplanctonique dans l’Aire Marine Protégée (AMP) de Bamboung et de deux sites environnants (Sénégal)

2020 ◽  
Vol 14 (7) ◽  
pp. 2452-2462
Author(s):  
Ali Mohamed Abdou Salam ◽  
Ngansoumana Ba ◽  
Ismaïla Ndour ◽  
Seyni Sane ◽  
Modou Thiaw ◽  
...  
Keyword(s):  
Marine Protected Areas ◽  
Temporal Distribution ◽  
Sampling Period ◽  
Site Effect ◽  
Taxonomic Composition ◽  
Environmental Data ◽  
Chemical Parameters ◽  
Mots Clés ◽  
Physico Chemical

Au Sénégal, peu d’études sur le plan planctonique ont été réalisées pour l’évaluation de l’efficacité des Aires Marines Protégées. Dans cette perspective, la caractérisation de la flore phytoplanctonique et sa distribution spatio-temporelle à l’intérieur et à l’extérieur de l’AMP de Bamboung a été réalisée en avril et en septembre 2016. Des prélèvements d’échantillons d’eau à l’aide d’un filet à plancton de 20 μm de mailles ainsi que des mesures de paramètres physico-chimiques ont été faits dans chaque station. L’analyse des données environnementales a montré l’existence d’un effet intersaison avec des valeurs plus élevées en avril excepté la température. Par ailleurs, un effet d’inter-sites a été observé uniquement en septembre pour la température, la salinité, la conductivité et l’oxygène dissout. En termes de diversité phytoplanctonique, en avril, 49 espèces réparties dans 5 classes ont été identifiées dans l’AMP contre 47 espèces et 5 classes identifiées à Diomboss et 42 espèces et 5 classes à Sangako. En septembre, 57 espèces réparties dans 5 classes ont été répertoriées dans l’AMP contre 54 espèces et 4 classes à Diomboss, et 51 espèces réparties dans 4 classes identifiées à Sangako. Les résultats seuls de la richesse spécifique du phytoplancton ne permettent pas d’apporter une contribution sur l’évaluation de l’efficacité de l’AMP de Bamboung. Mots clés : Phytoplancton, dynamique, composition taxonomique, AMP, Bamboung.   English Title: Characterization of the phytoplankton flora in the Protected Marine Area (MPA) of Bamboung and two surrounding sites (Senegal) In Senegal, few planktonic data exist in the Marine Protected Areas (AMP). In this perspective, the characterization of phytoplankton flora and its spatial and temporal distribution within and outside the Bamboung AMP was carried out during in April and in september. Water samples were taken using a 20 μm mesh plankton net and measurements of physico-chemical parameters were made at each station. The analysis of environmental data showed the existence of an inter-site effect during the two-month sampling period. In April, 49 species in 5 classes were identified in the AMP, compared to 47 species and 5 classes identified in Diomboss and 42 species and 5 classes in Sangako. In september, 57 species distributed in 5 classes were recorded in the AMP compared to 54 species distributed in 4 classes in Diomboss and 51 species and 4 classes identified in Sangako. The results of the specific richness of phytoplankton alone do not make it possible to make a contribution to the evaluation of the effectiveness of Bamboung's MPA.Keywords: Phytoplankton, dynamics, taxonomic composition, AMP; Bamboung.

Sign in / Sign up

Export Citation Format

Share Document