Establishing native plants in a weedy riparian environment

Figures & data

Figure 1  Sherry River trial site layout. Locations of replicated plots are indicated by numbers 1–10.

Table 1  Estimated costs of different weed-control treatments per seedling over 2 years

Treatment	Material	Pegs	Installation	Maintenance	Total
Control	$0.00	$0.00	$0.00	$0.00	$0.00
Herbicide	$0.18	$0.00	$0.21	$1.50	$1.89
Carpet	$0.00	$0.20	$1.71	$0.13	$2.04
Weed mat	$0.90	$0.20	$0.86	$0.06	$2.02
Carpet costs assume carpet will be available for free. Labour charges for installation and maintenance are estimated at the rate of $30/h.

Figure 2  Variation in seedling survival with weed-control treatment from 2005 to 2007. Letters indicate statistically significant differences in numbers of surviving seedlings between treatments at α = 0.05.

Figure 3  Variation between species in seedling survival from 2005 to 2007. Letters indicate statistically significant differences in numbers of surviving seedlings between species at α = 0.05.

Figure 4  Effects of weed-control treatment on height increments of surviving seedlings from 2005 to 2007 (means with error bars indicating SEM; n=34 for control, 48 for herbicide and 37 for carpet and weed mat). Letters indicate statistically significant differences in mean height increment between treatments at α = 0.05.

Figure 5  Differences between species in height increments of surviving seedlings from 2005 to 2007 (means with error bars indicating SEM; n=1 for Aristotelia serrata, 34 for Cordyline australis, 16 for Coprosma robusta, 22 for Kunzea ericoides, 25 for Plagianthus regius, 28 for Pittosporum tenuifolium and 30 for Podocarpus totara). Letters indicate statistically significant differences in mean height increment between species at α = 0.05. No error bar or letter is presented for A. serrata as only one specimen survived.

Figure 6  Effects of weed-control treatment on crown area increments of surviving seedlings from 2005 to 2007 (Means with error bars indicating SEM; n as for Fig. 4). Letters indicate statistically significant differences in mean crown area increment between treatments at α = 0.05.

Figure 7  Differences between species in crown area increments of surviving seedlings from 2005 to 2007 (Means with error bars indicating SEM; n as for Fig. 5). Letters indicate statistically significant differences in mean crown area increment between species at α = 0.05. No error bar or letter is presented for Aristotelia serrata, as only one specimen survived.