DOI: 10.1016/j.foreco.2014.10.028
Scopus记录号: 2-s2.0-84911191481
论文题名: Environmental fate of terbuthylazine and hexazinone in a New Zealand planted forest Pumice soil
作者: Garrett L.G. ; Watt M.S. ; Rolando C.A. ; Pearce S.H.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 337 起始页码: 67
结束页码: 76
语种: 英语
英文关键词: Forest floor
; Herbicide
; Hexazinone
; New Zealand
; Soil
; Terbuthylazine
Scopus关键词: Catchments
; Crops
; Decision making
; Floors
; Forestry
; Harvesting
; Soil moisture
; Soils
; Timber
; Weed control
; Environmental fate
; Forest floors
; Hexazinone
; Management practices
; New zealand
; Plantation forests
; Risk-based managements
; Terbuthylazine
; Herbicides
; decision making
; environmental fate
; forest floor
; hexazinone
; management practice
; organic matter
; pesticide application
; plantation forestry
; pumice
; soil drainage
; soil profile
; terbuthylazine
; New Zealand
; North Island
英文摘要: Herbicide use is an important tool for primary production in New Zealand, including forestry, and can significantly increase crop growth and economic yield. However, increasing concerns around the off-site impacts of herbicides in the environment has emphasised the need to understand their fate in soil and water. In the New Zealand forestry sector terbuthylazine and hexazinone are widely used for weed control, yet little is known about their environmental fate in New Zealand forests. A catchment scale (12.5. ha) experimental site was established in Pumice soil, recently harvested and replanted with Pinus radiata (D. Don), in a plantation forest in the central North Island, New Zealand. Forest litter (fresh litter (L), and partly and well decomposed litter (FH); LFH. <. 10. cm diameter), that included harvest residues, and mineral soil were monitored for terbuthylazine and hexazinone traces to depth (0-10, 10-50, 50-100. cm) after two operational aerial herbicide spray application events in 2012 and 2013. In order to determine the movement and persistence of each herbicide, the amount of terbuthylazine and hexazinone were measured periodically following the initial spraying event. There was no drainage of soil water past 1. m depth within the first 5. months after the first spray application in 2012 due to a regional drought. This resulted in limited movement of both terbuthylazine and hexazinone down the soil profile. During the 2013 monitoring period, three drainage events occurred after spray application, 30. mm of drainage occurred at 7-8. days, 32. mm occurred at 36-37. days and 24. mm occurred 170. days after spray application. Even with drainage both terbuthylazine and hexazinone were located predominantly in the LFH and top-soil (0-10. cm) layers with only small amounts detected at the lowest monitoring depth (50-100. cm). The presence of the LFH layer (which included harvest residues from the previous crop), high in organic rich matter strongly retained terbuthylazine and to a lesser extent hexazinone. Both terbuthylazine and hexazinone had appreciably shorter half-lives than reported in the literature. Reported half-lives were up to 10. days for terbuthylazine and up to 18. days for hexazinone. The first month after spray application was found to pose the greatest potential risk of movement off-site. After this period, potential risks were low. Organic matter management practices that influence the amount and distribution of forest floor and harvest residue retention clearly play an important role in determining the environmental fate of both terbuthylazine and hexazinone. These practices should be considered in further risk based management decision making. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65603
Appears in Collections: 影响、适应和脆弱性
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作者单位: Scion, Private Bag 3020, Rotorua, New Zealand; Scion, P.O. Box 29237, Christchurch, New Zealand
Recommended Citation:
Garrett L.G.,Watt M.S.,Rolando C.A.,et al. Environmental fate of terbuthylazine and hexazinone in a New Zealand planted forest Pumice soil[J]. Forest Ecology and Management,2015-01-01,337