scholarly journals High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability

2009 ◽  
Vol 325 (1-2) ◽  
pp. 109-121 ◽  
Author(s):  
Ansgar Kahmen ◽  
Stephen J. Livesley ◽  
Stefan K. Arndt
2018 ◽  
Vol 11 ◽  
pp. 194008291881390
Author(s):  
Natalie Breidenbach ◽  
Sri Rahayu ◽  
Iskandar Z. Siregar ◽  
Ulfah J. Siregar ◽  
Hamzah ◽  
...  

2020 ◽  
Vol 27 (12) ◽  
pp. 3676-3690
Author(s):  
Vassilios Triantafyllidis ◽  
Anastasios Zotos ◽  
Chariklia Kosma ◽  
Efthimios Kokkotos

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Ergua Atinafe ◽  
Ephrem Assefa ◽  
Birhanu Belay ◽  
Yemenzwork Endale ◽  
Talemos Seta

The study was carried out at Entoto Mountain and its surrounding area, about 10 km north of the center of Addis Ababa. The purpose of this study was to assess the floristic composition and regeneration status of woody species and recommend further conservation methods. Ten transect lines were laid from south-north at 1 km interval. Along these transect lines, 62 sample plots of 400 m2 (20 m × 20 m) were laid at 1 km interval. A total of 179 plant species belonging to 107 genera and 60 families were recorded. Asteraceae (30 species) was the most dominant family. Of 179 plant species, 73 were naturally regenerated woody species representing 48 genera and 34 families. Herbs account for the largest growth form (91, 50.84%), indicating the fact that disturbance favors herb species. For the analysis of vegetation diversity, woody species composition, and density, the study area was classified into five land-use types. Of the five land-use types, degraded land-use type had low species diversity and evenness (1.48 and 0.295), and it had a low density of economically and ecologically important larger trees. However, the density of seedlings and saplings showed the normal regeneration status for the herbs and shrubs. Therefore, responsible stakeholders should give high priority for the conservation of ecologically and economically important large trees using appropriate conservation methods in the study area.


1970 ◽  
Vol 15 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Ramadhanil Ramadhanil ◽  
Sri Soetarmi Tjitrosoedirdjo ◽  
Dede Setiadi

In the present study the diversity and species composition of understory plants are examined in the submontane forest of Lore Lindu National Park, Central Sulawesi, Indonesia by comparing three rain forest types and three types of plantations of cacao differing in use intensity. The results showed that 376 understory plant species consisting of 140 species of tree seedlings, 162 herbs and shrubs, 29 terrestrial ferns and 45 climbers were collected in all land use types. The mean species numbers of herbs did not differ among three forest types but was significantly higher in cacao plantation with high use intensity, being about three times higher than in undisturbed rain forest and lightly disturbed rain forest. Urticaceae, Araceae, Hypoxidaceae and Acanthaceae were predominant in the forests, whereas Asteraceae and Poaceae in the cacao plantations. The number of species of ferns and climbers did not differ between forests and plantations. The study also recorded several invasive plant species at the cacao plantations such as Piper aduncum L., Bidens pilosa L., Ageratum conyzoides L., Sclerea purpuriens Steud and Paspalum conjugatum Berg.Keywords: Cacao plantation, Primary forest, Structure and Composition, Understory plant assemblagesDOI: 10.3329/bjpt.v15i1.911 Bangladesh J. Plant Taxon. 15(1): 1-12, 2008 (June) 


Author(s):  
Trần Thanh Đức

This research carried out in Huong Vinh commune, Huong Tra town, Thua Thien Hue province aimed to identify types of land use and soil characteristics. Results showed that five crops are found in Huong Vinh commune including rice, peanut, sweet potato, cassava and vegetable. There are two major soil orders with four soil suborders classified by FAO in Huong Vinh commune including Fluvisols (Dystric Fluvisols<em>, </em>Gleyic Fluvisols and Cambic Fluvisols) and Arenosols (Haplic Arenosols). The results from soil analysis showed that three soil suborders including Dystric Fluvisols<em>, </em>Gleyic Fluvisols and Cambic Fluvisols belonging to Fluvisols were clay loam in texture, low pH, low in OC, total N, total P<sub>2</sub>O<sub>5</sub> and total K<sub>2</sub>O. Meanwhile, the Haplic Arenosols was loamy sand in texture, poor capacity to hold OC, total N, total P<sub>2</sub>O<sub>5</sub> and total K<sub>2</sub>O


2020 ◽  
Vol 7 (1) ◽  
pp. 91
Author(s):  
Júlio Barboza Chiquetto ◽  
Maria Elisa Siqueira Silva ◽  
Rita Yuri Ynoue ◽  
Flávia Noronha Dutra Ribieiro ◽  
Débora Souza Alvim ◽  
...  

A poluição do ar é influenciada por fatores naturais e antropogênicos. Quatro pontos de monitoramento (veicular, comercial, residencial e background urbano (BGU))da poluição do ar em São Paulo foram avaliados durante 16 anos, revelando diferenças significativas devidoao uso do solo em todas as escalas temporais. Na escala diurna, as concentrações de poluentes primários são duas vezes mais altas nos pontos veicular e residencial do que no ponto BGU, onde a concentração de ozonio (O3) é 50% mais alta. Na escala sazonal, as concentrações de monóxido de carbono(CO) variaram em 80% devido ao uso do solo, e 55% pela sazonalidade.As variações sazonais ede uso do solo exercem impactos similares nas concentrações de O3 e monóxido de nitrogênio (NO). Para o material particulado grosso (MP10) e o dióxido de nitrogênio(NO2), as variações sazonais são mais intensas do que as por uso do solo. Na série temporal de 16 anos, o ponto BGU apresentou correlações mais fortes e significativas entre a média mensal de ondas longas (ROL) e o O3 (0,48) e o MP10 (0,37), comparadas ao ponto veicular (0,33 e 0,22, respectivamente). Estes resultados confirmam que o uso do solo urbano tem um papel significativo na concentração de poluentes em todas as escalas de análise, embora a sua influência se torne menos pronunciada em escalas maiores, conforme a qualidade do ar transita de um sistema antropogênico para um sistema natural. Isto poderá auxiliar decisões sobre políticas públicas em megacidades envolvendo a modificação do uso do solo.


Sign in / Sign up

Export Citation Format

Share Document