Can intercropping with native trees enhance structural stability in young rubber (Hevea brasiliensis) agroforestry system?

In Nariño, Colombia, land use has generated some problems such as erosion, compaction, lack of fertility, among others, so it is necessary to search for alternatives to mitigate these impacts. The objective of this study was to evaluate some physical properties of the soil in an agroforest system with Morella pubescens (Humb. & Bonpl. ex Willd.) Wilbur with Smallanthussonchifolius (Poepp.) H.Rob, in the experimental farm of Botana, in the city of Pasto, Nariño, where the bulk density, real density, total porosity, structural stability properties and distribution of aggregates were analyzed. The datas were obtained in two phases: f1 and f2 before and after agroforestry system implementation, respectively. A randomized complete block design with three treatments and three replications were used. The treatments corresponded to plant densities, T1: S sonchifoliuos, sowed to 1x1m, T2:0.8x0.8m y T3:0.5x0.5m, with three replications. M pusescens was stablished to 4x4m between plants and 9 m between rows and the control (f1). The statistics have differences between f1 (control) and f2 (treatments), to the structural stability properties and distribution of aggregates. The ground suffered a structural stability change to stable lightly (0.97 D.P.M) in f1 to a stable moderate (2.53 D.P.M), in f2. The distribution of aggregates passed to 60% in f1 to 70.3% in f2, with a media aggregation status. The different agroforest systems management could help, in the long term, by improving the structure of the ground through the vegetal material of arboreal component, the application of a minimum farming and the addition of organic matter.

Download Full-text

Structural stability of the protein microfibrils of Hevea brasiliensis Latex

Journal of Molecular Biology ◽

10.1016/s0022-2836(66)80249-8 ◽

1966 ◽

Vol 18 (2) ◽

pp. 321-IN9 ◽

Cited By ~ 5

Author(s):

B.G. Audley ◽

E.G. Cockbain

Keyword(s):

Structural Stability ◽

Hevea Brasiliensis

Download Full-text

Sympodial Bamboo Cultivation under Native Shade Trees: an Agroforestry Perspective

Journal of Non Timber Forest Products ◽

10.54207/bsmps2000-2020-i3ux34 ◽

2020 ◽

Vol 27 (1) ◽

pp. 45-49

Author(s):

Milind Digambar Patil ◽

Keyword(s):

Agroforestry System ◽

Microbial Interactions ◽

Functional Ecology ◽

Hydraulic Lift ◽

Positive Effects ◽

Income Sources ◽

Multiple Interfaces ◽

Main Crop ◽

Native Trees ◽

Below Ground

Conventional bamboo cultivation practices advocates planting bamboo in cleared open areas. However, farmers in the south Konkan region of Western Ghats are traditionally cultivating bamboo in association with native trees. Various positive effects of native trees on the growth and development of individual culm, and a clump in general are reported as perceived by farmers. In addition to bamboo, farmers are getting multiple benefits derived from the preserved tree components. By considering bamboo as a main crop, I briefly reviewed various actual and possible interactions based on central biophysical hypothesis of agroforestry. Productivity of bamboo-tree agroforestry system as a whole is a function of multiple interfaces e.g. competition, mutualism, commensalism, association etc. and the mechanisms could be - various above and below-ground interactions, nutrient pumping, hydraulic lift, litter-fall and decomposition, nutrient cycling, microbial interactions, mycorrhizae association etc. and probably many others. Economic and ecosystem importance and the aspects of functional ecology in general are discussed. Importance of native trees and diversification of income sources to adopt various market and climate driven forces than monoculture farming are highlighted.

Download Full-text

Soil morphostructural characterization and coffee root distribution under agroforestry system with Hevea Brasiliensis

Scientia Agricola ◽

10.1590/1678-992x-2019-0150 ◽

2021 ◽

Vol 78 (6) ◽

Author(s):

Amanda Letícia Pit Nunes ◽

Glassys Louise de Souza Cortez ◽

Geovanna Cristina Zaro ◽

Thiago Ometto Zorzenoni ◽

Thadeu Rodrigues de Melo ◽

...

Keyword(s):

Hevea Brasiliensis ◽

Root Distribution ◽

Agroforestry System

Download Full-text

Time-resolved high-resolution electron microscopy of structural stability in mgo clusters

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100165823 ◽

1996 ◽

Vol 54 ◽

pp. 672-673

Author(s):

T. Kizuka ◽

N. Tanaka

Keyword(s):

Electron Microscopy ◽

High Resolution ◽

Magnesium Oxide ◽

Structural Stability ◽

High Resolution Electron Microscopy ◽

Video Tape ◽

Solid State Physics ◽

Time Resolved ◽

Resolution Electron ◽

Structural And Functional Properties

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.

Download Full-text