Examinando por Autor "Requena Rojas, Edilson Jimmy"

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Assessment of soil characteristics and the productive potential of native Poaceae forage species in the Central Highlands of Peru
(Polish Society of Ecological Engineering, 2025-06-10) Arias Arredondo, Alberto; Yalli Huamaní, Teodoro Bill; Cruz Luis, Juancarlos Alejandro; Requena Rojas, Edilson Jimmy; Solórzano Acosta, Richard Andy
Given the increasing pressure on natural grassland ecosystems in the Peruvian high Andes, optimizing the use of native forage species has become essential for understanding the relationship between soil characteristics and the productive potential of these plants. This study evaluated the relationship between soil properties and the produc tive potential of three native forage species: Festuca dolichophylla, Cinnagrostis vicunarum, and Jarava ichu. The research was conducted in natural grasslands in the district of Yauli, province of Yauli, department of Junin, at approximately 4000 m.a.s.l. During the dry season 2023, soil samples were collected following standardized protocols, and key soil parameters were analyzed. The nutritional characteristics of the forage species were also assessed, including dry matter content, total protein, calcium, phosphorus, in vitro organic matter digestibility, and metabolizable energy. The results revealed significant differences among species. Festuca dolichophylla exhibited the highest protein content (10.7%), superior digestibility (52.5%), and greater metabolizable energy (8.4 MJ∙kg-1), making it the most suitable forage option for livestock in the highland ecosystem over 4000 m.a.s.l., where en vironmental factors constrain agricultural activity. In contrast, Cinnagrostis vicunarum and Jarava ichu showed lower protein levels, with Jarava ichu displaying particularly low digestibility (28.9%) and energy content (4.6 MJ∙kg-1), limiting its productive potential despite its high dry matter yield. These findings provide a strong scien tific foundation for developing sustainable grassland management strategies in the Peruvian Andes, supporting the implementation of agronomic practices that enhance forage productivity while contributing to biodiversity conser vation. Moreover, this study highlights the importance of soil characterization as a key tool for optimizing forage resource utilization in high-altitude farming systems, facilitating informed decision-making in land management and environmental remediation policies.
The importance of tropical tree-ring chronologies for global change research
(Elsevier Ltd., 2025-03-06) Groenendijk, Peter; Babst, Flurin; Trouet, Valerie; Fan, Ze Xin; Granato Souza, Daniela; Maselli Locosselli, Giuliano; Mokria, Mulugeta; Panthi, Shankar; Pumijumnong, Nathsuda; Abiyu, Abrham; Acuña Soto, Rodolfo; Adenesky Filho, Eduardo; Alfaro Sanchez , Raquel; Anholetto Junior, Claudio Roberto; Vieira Aragao, José Roberto; Assis Pereira, Gabriel; Astudillo Sánchez, Claudia C.; Barbosa, Ana Carolina; de Oliveira Barreto, Nathan; Battipaglia, Giovanna; Beeckman, Hans; Botosso, Paulo Cesar; Bourland, Nils; Brauning, Achim; Brienen, Roel; Brookhouse, Matthew; Buajan, Supaporn; Buckley, Brendan M.; Camarero, J. Julio; Carrillo Parra, Artemio; Ceccantini, Gregorio; Centeno Erguera, Librado R.; Cerano Paredes, Julian; Cervantes Martínez, Rosalinda; Chanthorn, Wirong; Chen, Ya-Jun; Barçante Ladvocat Cintra, Bruno; Cornejo Oviedo, Eladio Heriberto; Cortés Cortés, Otoniel; Matos Costa, Clayane; Couralet, Camille; Crispin DelaCruz, Doris Bianca; D’Arrigo, Rosanne; David, Diego A.; De Ridder, Maaike; Del Valle, Jorge Ignacio; Díaz Carrillo, Oscar A.; Dobner Jr, Mario; Doucet, Jean Louis; Dünisch, Oliver; Dünisch, Oliver; Enquist, Brian J.; Esemann Quadros, Karin; Esquivel Arriaga, Gerardo; Fayolle, Adeline; Anete Bergamo Fenilli, M. Eugenia; Ferrero, M. Eugenia; Fichtler, Esther; Finnegan, Patrick M.; Fontana, Claudia; Francisco, Kainana S.; Fu, Pei-Li; Galvao, Franklin; Gebrekirstos, Aster; Giraldo, Jorge A.; Gloor, Emanuel; Godoy Veiga, Milena; Guerra, Anthony; Haneca, Kristof; Harley, Grant Logan; Heinrich, Ingo; Helle, Gerhard; Hernandez Díaz, José Ciro; Hornink, Bruna; Hubau, Wannes; Inga, Janet G.; Islam, Mahmuda; Jiang, Yu-mei; Kaib, Mark; Hassan Khamisi, Zakia; Koprowski, Marcin; Layme Huaman, Eva; Leffler, A. Joshua; Ligot, Gauthier; Lisi, Claudio Sergio; Loader, Neil J.; de Almeida Lobo, Francisco; Longhi Santos, Tomaz; Lopez, Lidio; Lopez Hernández, María I.; Penetra Cerveira Lousada, José Luis; Manzanedo, Rubén D.; Marcon, Amanda K.; Maxwell, Justin T.; Mendivelso, Hooz A.; Mendoza Villa, Omar N.; Nunes Menezes, Itallo Romany; Ribeiro Montoia, Valdinez; Moors, Eddy; Moreno, Miyer; Muniz Castro, Miguel Angel; Nabais, Cristina; Nathalang, Anuttara; Ngoma, Justine; de Carvalho Nogueira Jr., Francisco; Morales Oliveira, Juliano; Morais Olmedo, Gabriela; Ortega Rodriguez, Daigard Ricardo; Rodríguez Ortíz, Carmen Eugenia; Pagotto, Mariana Alves; Paredes Villanueva, Kathelyn; Pérez De Lis, Gonzalo P; Ponce Calderon, Laura Patricia; Portal Cahuana, Leif Armando; Pucha Cofrep, Darwin Alexander; Quadri, Paulo; Rahman, Mizanur; Ramírez, Jorge Andrés; Requena Rojas, Edilson Jimmy; Ribeiro, Adauto de Souza ak; Robertson, Lain; Roig, Fidel Alejandro; Roquette, José Guilherme; Rubio Camacho, Ernesto Alonso; Sánchez Salguero, Raúl; Sass Klaassen, Ute; Schongart, Jochen; Callegari Scipioni, Marcelo; Sheppard, Paul; Silva, Lucas C.R.; Slotta, Franziska; Soria Díaz, Leroy; K.V.S. Sousa, Luciana; Speer, James H.; Therrell, Matthew D.; Ticse Otarola, Ginette; Tomazello Filho, Mario; Torbenson, Max C.A.; Tor Ngern, Pantana; Touchan, Ramzi; Van Den Bulcke, Jan bi; Vazquez Selem, Lorenzo; Velázquez Pérez, Adin H.; Venegas González, Alejandro; Villalba, Ricardo; Villanueva Diaz, José; Vlam, Mart; Vourlitis, George; Wehenkel, Christian; Wils, Tommy; Zavaleta, Erika S.; Asfaw Zewdu, Eshetu; Zhang, Yong-Jiang; Zhou, Zhe-Kun; Zuidema, Pieter A.
Tropical forests and woodlands are key components of the global carbon and water cycles. Yet, how climate change affects these biogeochemical cycles is poorly understood because of scarce long-term observations of tropical tree growth. The recent rise in tropical tree-ring studies may help to fill this gap, but a large-scale quantitative analysis of their potential in global change research is missing. We compiled a list of all tropical tree species known to form annual tree rings and built a network encompassing 492 tropical ring-width chronologies to evaluate the potential to generate insights on climate sensitivity of woody productivity and to build centuries-long reconstructions of climate variability. We assess chronology quality, length, and climatic representativeness and explore how these change along climatic gradients. Finally, we applied species-distribution modeling to identify regions with potential for tree-ring studies in ecological and climatic studies. The number of tropical chronologies has rapidly increased, with ~400 added over the past two decades. Yet, tree-ring studies are biased towards high-elevation locations, with gaps in warmer and wetter climates, on the African continent, and for angiosperm species. The longest chronologies with strongest climate signals (i.e., synchronous growth variations among trees) are from cool regions. In wet regions, climate signals and precipitation sensitivity decrease. Most tropical regions harbor 5–15 (and up to 80) species with proven potential to generate chronologies. The potential for long climate reconstructions is particularly high in drier high elevation sites. Our findings support strategies to effectively expand tree-ring research in the tropics, by targeting specific species and regions. Tropical dendrochronology can importantly contribute to global change research by generating historical context of climate extremes, quantifying climate sensitivity of woody productivity and benchmarking vegetation models.