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2024-04-20
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BB02587207-11-P053
pdf
4.49 MB
27
基本情報
データ種別:学術成果リポジトリ
タイトル
Agricultural Land-Use Change in Northeastern Asia and Climate Change
作成者
OKAMOTO, Katsuo
SHINDO, Junko
KAWASHIMA, Hiroyuki
作成者の別表記
岡本, 勝男
新藤, 純子
川島, 博之
内容
[ABSTRACT] The self-sufficiency of rice in China, which has the largest population in the world, is 100% and Chinese people tend to prefer quality over quantity. The total area of paddy field in the northeastern part of China has increased because the climate conditions in this region are suitable for cultivating Japonica rice (short-grain rice). Large quantities of irrigation water are consumed for cultivating rice. Rainfed rice cropping is possible in places with sufficient precipitation, whereas rice cropping in regions with low precipitation is limited in places with easy access to water for irrigation. Flatlands are advantageous for rice cropping because of their geographical and social conditions. The eastern Heilongjiang province of China was selected as the test area for satellite image analysis. Land use/land cover was classified using the Landsat Thematic Mapper (TM) data of 1988 and the Enhanced Thematic Mapper Plus (ETM+) data of 2002. According to the statistics of Heilongjiang Province, the total area of paddy field has increased rapidly since 1995. On the basis of the 1988 land-use/land-cover classification map, areas suitable for rice cropping were determined and compared with the distribution of paddy fields in 2002. Most of the paddy fields in 2002 were changed from dry arable lands in 1988. The areas suitable for rice cropping are those with easy access to water for irrigation. Moreover, as a result of climate changes, air temperature and precipitation may become unsuitable for the cultivation of major cereals in Asia. Conversely, agriculture would affect the environment unfavorably. The major river basins with rice-cropping zones from East to Southeast Asia were studied. The possible changes in water quality in the future were evaluated. The data used included the river course, land-use/land-cover classification, population, climate, nitrous oxide (NOx) emission, and country boundary. Statistical data on rice yield, harvested area, fertilizer usage, food production, food consumption and food trade were also used to construct nitrogen load maps. The nitrogen load changes seasonally depending on the cropping systems used and the amount of precipitation. In the future, nitrogen discharge from humans and fertilizer use will increase along with the increase in population and cultivation intensity. Fertilizer use and NOx deposition will also increase along with economic growth. Therefore, the nitrogen concentration in river water will also increase. Excessive irrigation and fertilizer use during the dry season will result in the further deterioration of water quality, creating nonsustainable ecosystems in river basins.
ハンドルURL
https://opac.ll.chiba-u.jp/da/curator/104210/
フルテキストへのリンク
https://opac.ll.chiba-u.jp/da/curator/104210/BB02587207-11-P053.pdf
公開者
Chiba University. Center for Environmental Remote Sensing
公開者の別表記
千葉大学環境リモートセンシング研究センター
NII資源タイプ
会議発表用資料
NCID
BB02587207
掲載誌名
Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
巻
11
開始ページ
53
終了ページ
65
刊行年月
2005-12-13
著者版フラグ
publisher
カテゴリ
環境リモートセンシング研究センター「CEReSシンポジウム資料集」
その他の情報を表示
コンテンツの種類
会議発表用資料 Presentation
DCMI資源タイプ
text
ファイル形式 [IMT]
application/pdf
言語 [ISO639-2]
eng
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