Kahikatea Dacrycarpus dacrydioides and Totara-Matai Podocarpus totara-Prumnopitys taxifolia forest patches in the agricultural landscape, Westland, New Zealand: representatives of a past and future condition

2003 ◽  
Vol 9 (4) ◽  
pp. 278 ◽  
Author(s):  
C. J. Miller ◽  
D. A. Norton ◽  
T. K. Miller

Due to extensive clearance, podocarp forests on alluvial floodplains are under-represented, relative to their original extent, in the New Zealand agricultural landscape, and remnants are a priority for protection. This study uses a stand dynamics approach to 1) determine whether Kahikatea Dacrycarpus dacrydioides and Totara-Matai Podocarpus totara-Prumnopitys taxifolia forest patches in Westland, New Zealand, are remnants of pre-European forest, and 2) predict whether podocarp species will remain dominant in these patches. The majority of patches were initiated following European land clearance, with few being remnants of the original forest. Recruitment of podocarp seedlings and saplings into the canopy is no longer occurring in these stands, and over time they are likely to become dominated by angiosperm species. Within patch management may be an option to maintain podocarp dominance, while providing an economic return for landholders. While the forest types are representative of the original forest, the forest communities are not, with a lower � diversity than in intact Kahikatea forest in the region. Planning for and managing patches as a shifting mosaic in the landscape is likely to be the most successful approach for maintaining their conservation value in the region.

2018 ◽  
Vol 422 ◽  
pp. 323-337 ◽  
Author(s):  
Adam Benneter ◽  
David I. Forrester ◽  
Olivier Bouriaud ◽  
Carsten F. Dormann ◽  
Jürgen Bauhus

2019 ◽  
Vol 65 (6) ◽  
pp. 796-804 ◽  
Author(s):  
Steven M Gray ◽  
Gary J Roloff ◽  
Andrew J Dennhardt ◽  
Brian P Dotters ◽  
Thomas T Engstrom

Abstract We evaluated how forest type, vegetation structure in trapping webs, and proximate forest types influenced localized (~6.35 hectares) abundances for commonly captured small mammals in northern California, USA. We trapped from May to August of 2011–13 in 69 forest patches that represented: (1) clearcuts (3–5 years postharvest), (2) 10–20 year-old conifer plantations, (3) rotation-aged conifer stands, and (4) Watercourse and Lake Protection Zones. We captured 11 species; four in sufficient numbers for regression modeling. Our average abundance estimates for the study were 4.57 (standard error [SE] = 0.43), 0.32 (SE = 0.11), 0.90 (SE = 0.30), and 0.25 (SE = 0.09) individuals per web location (~0.75 hectares) for Peromyscus spp., Neotoma spp., California ground squirrels, and Allen’s chipmunks. We found that web-level ground cover (shrubs and grass), downed wood, and types of forests containing our trapping webs best described small mammal abundances, whereas proximate forest types were not important. Our results indicated that retaining localized structures in the form of understory shrub cover and downed wood positively influences small mammal abundance in intensively managed forests of northern California.


2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Ehsan Rahimi ◽  
Shahindokht Barghjelveh ◽  
Pinliang Dong

Abstract Background The growing human population around the world is creating an increased demand for food. In agricultural landscapes, forests are cleared and turned into agricultural land to produce more food. Increasing the productivity of agricultural land per unit area may prevent extreme forest degradation. Since many agricultural products are dependent on pollinators, it is possible to increase crop production by increasing the pollination rate in the agricultural landscapes. Pollinators are highly dependent on forest patches in agricultural landscapes. Therefore, by creating new forest patches around agricultural fields, we can increase the pollination rate, and thus the crop production. In this regard, estimating the effects of different scenarios of forest fragmentation helps us to find an optimized pattern of forest patches for increasing pollination in an agricultural landscape. Methods To investigate the effect of different forest fragmentation scenarios on pollination, we used simulated agricultural landscapes, including different forest proportions and degrees of fragmentation. Using landscape metrics, we estimated the relationship between pollination and landscape structure for each landscape. Results Our results showed that for increasing pollination, two significant factors should be considered: habitat amount and capacity of small patches to supply pollination. We found that when the capacity of small patches in supplying pollination was low, fragmented patterns of forest patches decreased pollination. With increasing capacity, landscapes with a high degree of forest fragmentation showed the highest levels of pollination. There was an exception for habitat amounts (the proportion of forest patches) less than 0.1 of the entire landscape where increasing edge density, aggregation, and the number of forest patches resulted in increasing pollination in all scenarios. Conclusion This study encourages agriculturists and landscape planners to focus on increasing crop production per unit area by pollinators because it leads to biodiversity conservation and reduces socio-economic costs of land-use changes. We also suggest that to increase pollination in agricultural landscapes by creating new forest patches, special attention should be paid to the capacity of patches in supporting pollinators.


2019 ◽  
Vol 647 ◽  
pp. 1573-1585 ◽  
Author(s):  
Daniel Ziche ◽  
Erik Grüneberg ◽  
Lutz Hilbrig ◽  
Juliane Höhle ◽  
Thomas Kompa ◽  
...  

2018 ◽  
Vol 29 (6) ◽  
pp. 978-988 ◽  
Author(s):  
Krista Takkis ◽  
Tiiu Kull ◽  
Tiit Hallikma ◽  
Piia Jaksi ◽  
Karin Kaljund ◽  
...  

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