Floral composition of the vegetation on levees of traditional and reconstructed paddies in Sakai city, Japan.

Yamaguchi, Hirofumi; Umemoto, Susumu; Maenaka, Hisayuki

doi:10.3719/weed.43.249

Cited by 19 publications

(7 citation statements)

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“…In addition, invasive alien plants such as Solidago altissima often dominate dry fields and displace native plants (Okubo and Maenaka, 1995;Yamaguchi et al, 1998). Aquatic insects have also lost larval-stage habitats.…”

Section: Efficient Irrigation/drainage Systemsmentioning

confidence: 99%

A review of post-war changes in rice farming and biodiversity in Japan

Katayama

Baba

Kusumoto

et al. 2015

Agricultural Systems

155

100

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A B S T R A C TFlooded rice fields can provide habitats for wetland species and ecosystem services similar to those of natural wetlands. During the last three decades, however, farming practices and management systems have been intensified in many rice-producing countries. In addition, more recent socioeconomic changes have caused agricultural abandonment in some parts of East and Southeast Asian countries such as Japan. This study reviewed long-term statistics on rice farming, as well as the impact of agricultural intensification and abandonment on farmland biodiversity at multiple spatial scales in Japan. The impact of pesticide use was greatest in the 1950s-1970s, when the use of highly toxic agents had not yet been prohibited. More recently, different components of agricultural intensification have been the largest threat for various taxa, for example, chemical pesticides for aquatic plants and invertebrates and modern efficient irrigation/ drainage systems for amphibians, fishes, and waterbirds. The negative impacts of agricultural abandonment on farmland species have been rapidly increasing with the expansion of abandoned fields and the subsequent vegetation succession and loss of habitat heterogeneity. We also discuss the effectiveness of environmentally friendly farming practices, including the reduced use of pesticides, winter paddy flooding, and installation of fishways, to reduce the negative impacts of agricultural intensification on farmland species in rice-paddy landscapes.

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Section: Efficient Irrigation/drainage Systemsmentioning

confidence: 99%

A review of post-war changes in rice farming and biodiversity in Japan

Katayama

Baba

Kusumoto

et al. 2015

Agricultural Systems

155

100

View full text Add to dashboard Cite

show abstract

“…Laborsaving measures such as plot consolidation and artificial ridge covering using ground cover plants or plastic sheets for weed control can be adopted in order to encourage farmers not to abandon paddies. As a consequence of the improvement of socio-economic conditions in rural areas, drastic changes occurred in the agricultural ecosystem, resulting in a rapid decrease of biodiversity and rare species (Sakoda and Takeda 1998;Yamaguchi et al 1998;Ito et al 1999;Arita and Kobayashi 2000;Matsumura 2002;Okubo 2002).…”

Section: Introductionmentioning

confidence: 99%

The relationships between the structure of paddy levees and the plant species diversity in cultural landscapes on the west side of Lake Biwa, Shiga, Japan

Fukamachi

Oku

Miyake³

2005

Landscape Ecol Eng

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The relationships between the structure of paddy levees and the plant species diversity in cultural landscapes on the west side of Lake Abstract Paddy levees form networks of narrow linear habitats and play various roles in cultural landscapes. Traditional landscapes on the west side of Lake Biwa consist of paddy field terraces and both ''stone'' and ''soil'' levees that have been maintained by paddy field management using local resources. Paddy levees in this study site are principally classified into five different types. Our study points out how differences in paddy levee structure as well as in management practices influence the plant species. Seventeen paddy levee transects were split into four habitat types based on their species components by TWINSPAN. Spatial characteristics and physical structures of paddy levees depended on natural conditions and human activities. The speciesarea curves of each levee type showed a clear distinction:

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“…Most farmers mow (and sometimes burn) tree and shrub seedlings and herbs (including grasses) one to six times a year to control pathogen/insect attacks on crops (Seo and Kido 2000), thus maintaining seminatural grassland conditions (Appendix A). Recent land-use changes (both paddy abandonment and consolidation) have caused a rapid decline in the grassland plant diversity of satokusachi vegetation throughout Japan (Yamaguchi et al 1998, Fukamachi et al 2005, Matsumura and Takeda 2010, Uematsu et al 2010). As of 2005, a total of 386 000 ha of cultivated land had been abandoned in Japan (about 10% of the total cultivated land area [Ministry of Agriculture Forestry and Fisheries 2005]), and most abandoned fields were concentrated in paddy terraces because of their low accessibility and low productivity (Uematsu et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Topography‐ and management‐mediated resource gradients maintain rare and common plant diversity around paddy terraces

Uematsu

Ushimaru

2013

Ecological Applications

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Examining the causes of interspecific differences in susceptibility to bidirectional land-use changes (land abandonment and use-intensification) is important for understanding the mechanisms of global biodiversity loss in agricultural landscapes. We tested the hypothesis that rare (endangered) plant species prefer wet and oligotrophic areas within topography- and management-mediated resource (soil water content, nutrient, and aboveground biomass) gradients, making them more susceptible to both abandonment and use-intensification of agricultural lands. We demonstrated that topography and management practices generated resource gradients in seminatural grasslands around traditional paddy terraces. Terraced topography and management practices produced a soil moisture gradient within levees and a nutrient gradient within paddy terraces. Both total and rare species diversity increased with soil water content. Total species diversity increased in more eutrophied areas with low aboveground biomass, whereas rare species diversity was high under oligotrophic conditions. Rare and common species were differentially distributed along the human-induced nutrient gradient, with rare species preferring wet, nutrient-poor environments in the agricultural landscapes studied. We suggest that conservation efforts should concentrate on wet, nutrient-poor areas within such landscapes, which can be located easily using land-use and topography maps. This strategy would reduce the costs of finding and conserving rare grassland species in a given agricultural landscape.

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Floral composition of the vegetation on levees of traditional and reconstructed paddies in Sakai city, Japan.

Cited by 19 publications

References 0 publications

A review of post-war changes in rice farming and biodiversity in Japan

A review of post-war changes in rice farming and biodiversity in Japan

The relationships between the structure of paddy levees and the plant species diversity in cultural landscapes on the west side of Lake Biwa, Shiga, Japan

Topography‐ and management‐mediated resource gradients maintain rare and common plant diversity around paddy terraces

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