Mid-rotation response of Pinus taeda to early silvicultural treatments in subtropical Argentina

FOREST ECOLOGY AND MANAGEMENT

卷:473

Article

Schulte, Morgan L.¹  Cook, Rachel L.¹  Albaugh, Timothy J.²  Allen, H. Lee³  Rubilar, Rafael A.⁴  Pezzutti, Raul⁵  Lucia Caldato, Silvana⁶  Campoe, Otavio⁷  Carter, David R.² 

[1] North Carolina State Univ, Dept Forestry & Environm Resources, Forest Prod Cooperat, 2800 Faucette Dr,Campus Box 8008, Raleigh, NC 27695 USA

[2] Virginia Tech, Dept Forest Resources & Environm Conservat, Forest Prod Cooperat, 228 Cheatham Hall, Blacksburg, VA 24601 USA

[3] ProFor Consulting, Cary, NC USA

[4] Univ Concepcion, Fac Ciencias Forestales, Cooperat Prod Forestal Dept Silvicultura, Victoria 631,Casilla 160-C, Concepcion, Chile

[5] CMPC, Bosques Plata, Av Juan Manuel Fangio 3873, Posadas, Argentina

[6] Univ Salvador, Ruta 14 Km 728, Gobernador Virasoro, Corrientes, Argentina

[7] Univ Fed Lavras, Dept Ciencias Florestais, Forest Prod Cooperat, Lavras, MG, Brazil

关键词: Loblolly pine;    Site preparation;    Fertilization;    Weed control;    Bedding;    Subsoiling;    Exotic Pine Plantation;    Subtropical Argentina;    Red soils;   

DOI  :  10.1016/j.foreco.2020.118317

来源: Elsevier

【 摘 要 】

Pinus taeda plantations in subtropical areas of South America are extremely productive and commonly established on well-drained red clay sites. In the past, land with more poorly-drained soil was avoided due to concern over the factors limiting site productivity. Establishment of intensively managed plantations on poorly-drained soils usually includes soil preparation by subsoiling and/or bedding, weed control, and fertilization. However, forest managers lack information about the efficacy of early silvicultural practices to ameliorate environmental limitations and if these intensive practices generate long-term improvements in productivity in this area. Consequently, we established studies in northeastern Argentina on two sites differing by drainage class and soil texture as a full factorial design with site preparation (S; disking and disking + subsoiling (red clay) or bedding (wet loam)), fertilization (F; none or 78 kg ha(-1) elemental phosphorus at planting), and weed control (W; none or two-year banded). Seven years after planting, the red clay and wet loam sites were equally productive, with maximum treatment means of 218 m(3) ha(-1) and 264 m(3) ha(-1) respectively. At the red clay site, only weed control significantly increased volume. At the wet loam site, both weed control and site preparation significantly increased volume, mainly due to increased survival. The combination of weed control and bedding yielded a nonadditive volume response as indicated by a significant W*S interaction. Our results do not support the common practice of subsoiling on red clay soils. In addition, fertilization with P alone appears counterproductive or unneeded at both sites.

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