Comparison of management strategies for controlling Nassella trichotoma in modified tussock grasslands in New Zealand: a spatial and economic analysis

WEED RESEARCH(2015)

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摘要
The weedy grass Nassella trichotoma (nassella tussock), historically an economically damaging invader of modified tussock grasslands in New Zealand, currently causes little if any reduction in farm production. This is a result of successful historical regional management programmes in which plants have been removed manually (by grubbing) each year before they seed. To inform a debate about the need for ongoing regional management, we developed a stage-structured spatially explicit integrodifference equation population model and linked this to a cost analysis. We used the model to compare the weed's future population trajectories and related regional control costs over 50years under three alternative management scenarios. The total discounted (3% p.a.) costs of no management, three-yearly grubbing and continued annual grubbing were NZ $417 million, $736 million and $131 million respectively. These analyses indicate that annual grubbing of N.trichotoma returns a net benefit of $286 million ($417 - $131 million) compared with doing nothing and a net benefit of $605 million ($736 - $131 million) compared with a 3-yearly grubbing programme. These results support the continuation of annual grubbing as the long-term economically optimal management strategy for N.trichotoma on pastoral farms infested by the weed in New Zealand.
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weed,population model,serrated tussock,nassella tussock,integrodifference,matrix model,cost-benefit analysis
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