scholarly journals Soil and hydrological responses to wild pig (Sus scofa) exclusion from native and strawberry guava (Psidium cattleianum)-invaded tropical montane wet forests

Geoderma ◽  
2016 ◽  
Vol 279 ◽  
pp. 53-60 ◽  
Author(s):  
Ayron M. Strauch ◽  
Gregory L. Bruland ◽  
Richard A. MacKenzie ◽  
Christian P. Giardina
Keyword(s):  
Psidium Cattleianum ◽  
Hydrological Responses ◽  
Wet Forests ◽  
Wild Pig

The influence of forest site on rate and extent of soil compaction and profile disturbance of skid trails during ground-based harvesting

2000 ◽  
Vol 30 (8) ◽  
pp. 1196-1205 ◽  
Author(s):  
J R Williamson ◽  
W A Neilsen
Keyword(s):  
Root Growth ◽  
Soil Compaction ◽  
Forest Type ◽  
Soil Bulk Density ◽  
Parent Material ◽  
Forest Site ◽  
Undisturbed Soil ◽  
Soil Parent Material ◽  
Wet Forests

Soil compaction has been considered a principal form of damage associated with logging, restricting root growth and reducing productivity. The rate and extent of soil compaction on skid trails was measured at six field locations covering a range of dry and wet forests. Data was collected for up to 21 passes of a laden logging machine. A similar extent of compaction, averaging 0.17 g·cm-3 increase in total soil bulk density (BD), was recorded for all field sites despite substantial site and soil differences. On average, 62% of the compaction in the top 10 cm of the soil occurred after only one pass of a laden logging machine. The environment under which soils had formed played a major role in determining the BD of the undisturbed soil. Compaction was strongly related to the original BD, forest type, and soil parent material. Soil strengths obtained in the field fell below levels found to restrict root growth. However, reduction in macropores, and the effect of that on aeration and drainage could reduce tree growth. On the wettest soils logged, machine forces displaced topsoils rather than causing compaction in situ. Recommended logging methods and implications for the development of sustainability indices are discussed.

scholarly journals Soil or fire: what causes treeless sedgelands in Tasmanian wet forests?

2017 ◽  
Vol 420 (1-2) ◽  
pp. 1-18 ◽  
Author(s):  
David M. J. S. Bowman ◽  
George L. W. Perry
Keyword(s):  
Wet Forests

scholarly journals Hydrological recovery in two large forested watersheds of southeastern China: the importance of watershed properties in determining hydrological responses to reforestation

2016 ◽  
Vol 20 (12) ◽  
pp. 4747-4756 ◽  
Author(s):  
Wenfei Liu ◽  
Xiaohua Wei ◽  
Qiang Li ◽  
Houbao Fan ◽  
Honglang Duan ◽  
...  
Keyword(s):  
Watershed Management ◽  
Large Scale ◽  
Management Strategies ◽  
Forest Recovery ◽  
Southeastern China ◽  
Forested Watersheds ◽  
Positive Effects ◽  
Low Flows ◽  
Hydrological Responses ◽  
High Flows

Abstract. Understanding hydrological responses to reforestation is an important subject in watershed management, particularly in large forested watersheds ( >  1000 km2). In this study, we selected two large forested watersheds (Pingjiang and Xiangshui) located in the upper reach of the Poyang Lake watershed, southeastern China (with an area of 3261.4 and 1458 km2, respectively), along with long-term data on climate and hydrology (1954–2006) to assess the effects of large-scale reforestation on streamflow. Both watersheds have similar climate and experienced comparable and dramatic forest changes during the past decades, but with different watershed properties (e.g., the topography is much steeper in Xiangshui than in Pingjiang), which provides us with a unique opportunity to compare the differences in hydrological recovery in two contrasted watersheds. Streamflow at different percentiles (e.g., 5, 10, 50 and 95 %) were compared using a combination of statistical analysis with a year-wise method for each watershed. The results showed that forest recovery had no significant effects on median flows (Q50%) in both watersheds. However, reforestation significantly reduced high flows in Pingjiang, but had limited influence in Xiangshui. Similarly, reforestation had significant and positive effects on low flows (Q95%) in Pingjiang, while it did not significantly change low flows in Xiangshui. Thus, hydrological recovery is limited and slower in the steeper Xiangshui watershed, highlighting that watershed properties are also important for determining hydrological responses to reforestation. This finding has important implications for designing reforestation and watershed management strategies in the context of hydrological recovery.

scholarly journals Biologia e infestação de Strepsicrates smithiana em araçazeiro

2016 ◽  
Vol 51 (3) ◽  
pp. 280-283
Author(s):  
Gabriela Inés Diez-Rodríguez ◽  
Dori Edson Nava ◽  
Lucas Khun Hubner ◽  
Francisco Cardoso Canez Neto ◽  
Luis Eduardo Corrêa Antunes
Keyword(s):  
Psidium Cattleianum

Resumo: O objetivo deste trabalho foi estudar a biologia de Strepsicrates smithiana (Lepidoptera: Tortricidae) e determinar sua infestação em araçazeiro (Psidium cattleianum). Os parâmetros biológicos foram avaliados, uma tabela de vida de fertilidade foi elaborada e a infestação em um pomar de araçazeiro foi estabelecida. A duração do período ovo-adulto foi de 43,4 dias, e a sobrevivência foi de 21,3%. As fêmeas colocaram em média 135 ovos, e a longevidade de machos e fêmeas foi de 16,5 e 17,6 dias, respectivamente. Strepsicrates smithiana aumenta 32 vezes a cada geração, e a duração média de uma geração é de 45 dias. A maior infestação foi registrada em janeiro.

scholarly journals New gall midges (Diptera, Cecidomyiidae) associated with Eugenia uniflora and Psidium cattleianum (Myrtaceae)

2011 ◽  
Vol 101 (1-2) ◽  
pp. 69-74 ◽  
Author(s):  
Valéria C Maia ◽  
Dori E Nava
Keyword(s):  
New Species ◽  
New Genus ◽  
Gall Midges ◽  
Eugenia Uniflora ◽  
Psidium Cattleianum ◽  
Two New Species

Two new species and a new genus of gall midges (Diptera, Cecidomyiidae) are described and illustrated. Both species induce leaf galls on Myrtaceae, the former on Eugenia uniflora and the latter on Psidium cattleianum.

scholarly journals A model of hydrological and mechanical feedbacks of preferential fissure flow in a slow-moving landslide

2013 ◽  
Vol 17 (3) ◽  
pp. 947-959 ◽  
Author(s):  
D. M. Krzeminska ◽  
T. A. Bogaard ◽  
J.-P. Malet ◽  
L. P. H. van Beek
Keyword(s):  
Slope Stability ◽  
Preferential Flow ◽  
Water Pressure ◽  
Flow Paths ◽  
Landslide Activity ◽  
Hydrological Responses ◽  
Preferential Flow Paths ◽  
Slow Moving ◽  
Groundwater Drainage ◽  
Opening And Closing

Abstract. The importance of hydrological processes for landslide activity is generally accepted. However, the relationship between precipitation, hydrological responses and movement is not straightforward. Groundwater recharge is mostly controlled by the hydrological material properties and the structure (e.g., layering, preferential flow paths such as fissures) of the unsaturated zone. In slow-moving landslides, differential displacements caused by the bedrock structure complicate the hydrological regime due to continuous opening and closing of the fissures, creating temporary preferential flow paths systems for infiltration and groundwater drainage. The consecutive opening and closing of fissure aperture control the formation of a critical pore water pressure by creating dynamic preferential flow paths for infiltration and groundwater drainage. This interaction may explain the seasonal nature of the slow-moving landslide activity, including the often observed shifts and delays in hydrological responses when compared to timing, intensity and duration of precipitation. The main objective of this study is to model the influence of fissures on the hydrological dynamics of slow-moving landslide and the dynamic feedbacks between fissures, hydrology and slope stability. For this we adapt the spatially distributed hydrological and slope stability model (STARWARS) to account for geotechnical and hydrological feedbacks, linking between hydrological response of the landside and the dynamics of the fissure network and applied the model to the hydrologically controlled Super-Sauze landslide (South French Alps).

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