Scenario Analysis of Renewable Energy–Biodiversity Nexuses Using a Forest Landscape Model

Frontiers in Ecology and Evolution

卷:8

Masahiro Nakaoka¹  Takashi Machimura³  Chihiro Haga³  Marimi Maeda³  Takanori Matsui³  Takahiro Inoue⁴  Hideaki Shibata⁴  Wataru Hotta⁵  Shizuka Hashimoto⁶  Osamu Saito⁶  Junko Morimoto⁷ 

[1] Akkeshi Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Akkeshi, Japan;

[2] Department of Ecosystem Studies, The University of Tokyo, Bunkyo-ku, Japan;

[3] Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Suita, Japan;

[4] Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Japan;

[5] Graduate School of Agriculture, Hokkaido University, Sapporo, Japan;

[6] Institute for Global Environmental Strategies, Hayama, Japan;

[7] Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan;

关键词: climate change;    renewable energy mix;    farmland abandonment;    solar power generation;    woody biomass energy;    LANDIS-II;   

DOI  :  10.3389/fevo.2020.00155

来源: DOAJ

【 摘 要 】

The introduction of renewable energy (RE) is essential for building a sustainable society. However, RE can cause conflicts between energy production and biodiversity conservation. This study conducted a scenario analysis to evaluate potential conflicts in the nexuses between energy and biodiversity for the Bekambeushi River watershed located in northeastern Japan. The increasing rate of pastureland abandonment resulting from a declining farmer population is a source of great uncertainty in this area. Two alternative sources of RE were selected to utilize these abandoned pasturelands, each taking a unique approach to meet targets stipulated by regional energy plans, thereby producing different ecological consequences at the landscape scale. Thirty-one RE introduction options were simulated, comprising a range of pastureland abandonment expansion speeds and ratios of solar photovoltaic (PV) plant installation to biomass energy use. These were superimposed using two IPCC representative concentration pathway (RCP) scenarios, 2.6 and 8.5, resulting in 62 scenarios that were summarized as three groups based on the RE supply–demand balance and the ecological impacts. The LANDIS-II model was used to simulate these scenarios from 2016 to 2100. The results indicate that both the rate of pastureland abandonment and the ratio of the two RE sources had a large impact on changes in tree species diversity and the habitat suitability of raptors. Abandoned pastureland converted to tree biomass energy production shifted to pioneer species-dominated forest. The plant species composition of transitional forests varied between the climate scenarios. The higher temperature of the RCP 8.5 scenario toward 2100 prevented the establishment of Betula platyphylla and altered tree species diversity and the habitat suitability of Ketupa blakistoni blakistoni. Biomass energy utilization produced less energy than the demand but increased the three ecological indicators. Solar PV systems provided more energy than the regional demand, but the tree diversity and habitat suitability indices for two raptors declined. However, an appropriate mixture of the two RE sources satisfied the regional energy demand and maintained ecological conditions. Our results suggest that land–energy planning should consider energy–biodiversity nexuses to strike a balance between decarbonization and biodiversity conservation.

【 授权许可】

Unknown