Soil recovery of alluvial gold mine spoils in the Peruvian Amazon using Stylosanthes guianensis , a promising cover crop

2021 ◽  
Author(s):  
Manuel Gabriel Velásquez Ramírez ◽  
Dennis Castillo Torres ◽  
Juan Antonio Guerrero Barrantes ◽  
Joel Vásquez Bardales ◽  
Evert Thomas ◽  
...  
Keyword(s):  
Cover Crop ◽  
Gold Mine ◽  
Peruvian Amazon ◽  
Mine Spoils ◽  
Stylosanthes Guianensis ◽  
Alluvial Gold ◽  
Soil Recovery

Heavy metals in alluvial gold mine spoils in the peruvian amazon

CATENA ◽  
2020 ◽  
Vol 189 ◽  
pp. 104454
Author(s):  
Manuel Gabriel Velásquez Ramírez ◽  
Juan Antonio Guerrero Barrantes ◽  
Evert Thomas ◽  
Luis Alfredo Gamarra Miranda ◽  
Martin Pillaca ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Gold Mine ◽  
Peruvian Amazon ◽  
Mine Spoils ◽  
Alluvial Gold

Mercury in soils impacted by alluvial gold mining in the Peruvian Amazon

2021 ◽  
Vol 288 ◽  
pp. 112364
Author(s):  
Manuel Gabriel Velásquez Ramírez ◽  
Claudia Maribel Vega Ruiz ◽  
Ronald Corvera Gomringer ◽  
Martin Pillaca ◽  
Evert Thomas ◽  
...  
Keyword(s):  
Gold Mining ◽  
Peruvian Amazon ◽  
Alluvial Gold

scholarly journals Evaluation of four pasture legumes species as forages and cover crops in oil palm plantation

2018 ◽  
Vol 22 (3) ◽  
pp. 124
Author(s):  
Rijanto Hutasoit
Keyword(s):  
Chemical Composition ◽  
Cover Crops ◽  
Oil Palm ◽  
Cover Crop ◽  
N Fixation ◽  
Palm Fruit ◽  
Clitoria Ternatea ◽  
Arachis Glabrata ◽  
Stylosanthes Guianensis ◽  
Pasture Legumes

Pasture legumes is a very high quality of forage. The limited land is the problem of its development. Integration with oil palm plantations is one of the potentials for its development. This study was aimed to investigate the productivity of several legumes (Arachis glabrata, Stylosanthes guianensis, Clitoria ternatea, and Chamaecrista rotundifolia) as forages and cover crop. The potential tests were conducted in oil palm area of 4608 m<sup>2</sup>, in a complete block design with four treatments (legume species) and three replications. Parameters observed were: Legum production, leaf/stem ratio, chemical composition of legume, concentration of N, P in the soil, microbes in the soil, leguminous digestibility and palm fruit production. Results showed that the highest legume production (DM) was (P&lt;0.05) in the species of Clitoria ternatea (16.15 tons ha-1year-1), the highest leaf/stem ratio (P&lt;0.05) was in the Arachis glabrata (2.09). The chemical composition (DM) did not differ (P&gt;0.05) ranged from 33.75 to 35.75%, the organic matter (OM) varied greatly (P&lt;0.05) the highets was in Clitoria ternatea. The highest Crude protein (P&lt;0.05) was in Clitoria ternatea 17.84%. NDF concentrations did not differ (P&gt;0.05). The lowest ADF concentration (P&lt;0.05) was in Chamaecrista rotundifolia. The concentration of N in the soil indicated that early year of activity was similar (average 0.10%), at the end of activity increased (P&lt;0.05) in treatment Stylosanthes guianensis (0.16%). The highest population of N-fixation bacteria of 1.76x109 and phosphate solvent of 9.8x105 were in the treatment of Clitoria ternatea. Production of fresh fruit bunches of the palm was relatively similar (P&gt;0.05) ranged from 16.52-19.21 tons ha<sup>-1</sup>year<sup>-1</sup>. It is concluded that Clitoria ternatea is the best species of legume tested as forage and cover crop in oil palm plantations.

scholarly journals TANAMAN PAKAN LEGUMINOSA DALAM SISTEM INTEGRASI DENGAN PERKEBUNAN JERUK

Pastura ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 32
Author(s):  
Rijanto Hutasoit ◽  
Andi Tarigan ◽  
Juniar Sirait
Keyword(s):  
Cover Crop ◽  
Clitoria Ternatea ◽  
Arachis Glabrata ◽  
Stylosanthes Guianensis

Penelitian bertujuan untuk mengetahui karakteristik morfologi dan potensi beberapa tanaman legum sebagai sumber pakan dan cover crop di lahan perkebunan jeruk, empat spesies legum yang digunakan yaitu: Arachis glabrata, Stylosanthes guianensis, Clitoria ternatea dan Chamaecrista rotundifolia. Uji potensi dilakukan dilahan perkebunan jeruk seluas 1200 m2 dalam rancangan acak lengkap dengan empat perlakuan (spesies legum) dan tiga ulangan. Karakteristik morfologi menunjukkan Stylosanthes guianensis adalah tanaman tertinggi (78,03 cm), Clitoria ternatea memiliki daun terlebar (31,14 mm) dan terpanjang (47,27 mm), Arachis glabrata memiliki jumlah daun terbanyak (125,46 lembar), sedangkan Chamaecrista rotundifolia memiliki rasio daun: batang tertinggi (1,77). Warna hijau pada daun dimiliki oleh Stylosanthes guianensis, sedangkan ketiga jenis lainya berwarna hijau muda. Produksi bahan kering (BK) tertinggi (P<0,05) pada Stylosanthes guianensis (22,67 ton ha-1 tahun-1). Komposisi kimiawi menunjukkan kadar BK tertinggi (P<0,05) pada tanaman Stylosanthes guianensis (27,72%). Clitoria ternatea memiliki protein kasar (PK) tertinggi (17,16%) dan serat kasar (SK) terendah (29,80%). Kanndungan n itrogen (N) pada tanah naik pada akhir kegiatan, tertinggi pada Stylosanthes guianensis (0,21%). Disimpulkan bahwa jenis Stylosanthes guianensis dan Clitoria ternatea merupakan tanaman yang banyak keunggulan sebagai sumber pakan dan cover crop dalam sistem integrasi dengan perkebunan jeruk. Kata kunci: leguminosa, integrasi, cover crop, tanaman pakan

Processes affecting the chemical composition of Blue Lake, an alluvial gold-mine pit lake in New Zealand

2004 ◽  
Vol 55 (2) ◽  
pp. 201 ◽  
Author(s):  
Shaun L. L. Barker ◽  
Jonathan P. Kim ◽  
Dave Craw ◽  
Russell D. Frew ◽  
Keith A. Hunter
Keyword(s):  
New Zealand ◽  
Trace Metals ◽  
Gold Mining ◽  
Gold Mine ◽  
Pit Lake ◽  
Evaporative Concentration ◽  
Blue Lake ◽  
Alluvial Gold ◽  
Mine Pit Lake ◽  
Lake Waters

Blue Lake is an abandoned, water-filled alluvial gold-mine pit in Central Otago, New Zealand. Alluvial gold mining is generally considered to be chemically benign, unless mercury is added to assist gold separation. The major element, trace metal and isotopic composition of the pit lake was compared to nearby, unaffected streams. Blue Lake was found to be enriched in the major cations, with levels that were 2–5 times higher than in unaffected streams. Furthermore, Cu, Ni and Zn concentrations exceeded 10 nmol L–1 in Blue Lake; these levels were 2–30 times higher than those in nearby, unaffected streams. Processes affecting the lake’s characteristics include evaporative concentration, and the oxidation and dissolution of locally derived sulfide and sulfate minerals. Localised acidification in surface and ground waters around the lake leads to the mobilisation of Zn and Ni, resulting in lake waters being strongly enriched in these trace metals (concentrations greater than 40 nmol L–1), whereas surrounding stream waters have much lower Ni and Zn concentrations (less than 5 nmol L–1). Ongoing evaporative concentration, and the continuing mobilisation of trace metals, implies that metal enrichment in lake waters will continue to occur. The present study demonstrated that the ‘benign’ process of alluvial gold mining can have significant chemical consequences in resulting water bodies.

scholarly journals SOIL DEGRADED BY ALLUVIAL GOLD MINING IN THE PERUVIAN AMAZON: CLASSIFICATION APPLYING SOIL TAXONOMY (2014) AND WRB (2015)

Authorea ◽  
2020 ◽  
Author(s):  
Manuel Velasquez Ramirez ◽  
Julio Nazario Rios ◽  
Juan Guerrero Barrantes ◽  
Roger Escobedo Torres ◽  
Evert Thomas ◽  
...  
Keyword(s):  
Gold Mining ◽  
Peruvian Amazon ◽  
Soil Taxonomy ◽  
Alluvial Gold

Environmental impacts of the life cycle of alluvial gold mining in the Peruvian Amazon rainforest

2019 ◽  
Vol 662 ◽  
pp. 940-951 ◽  
Author(s):  
Ramzy Kahhat ◽  
Eduardo Parodi ◽  
Gustavo Larrea-Gallegos ◽  
Carlos Mesta ◽  
Ian Vázquez-Rowe
Keyword(s):  
Life Cycle ◽  
Environmental Impacts ◽  
Gold Mining ◽  
Amazon Rainforest ◽  
Peruvian Amazon ◽  
Alluvial Gold
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