中国の主要農耕地における著しい酸性化
1College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
まとめ
中国における集中農業は,窒素循環とカチオン吸収が主な原動力であることから,土壌の大幅な酸性化をもたらした. 酸性堆積は,この広範囲にわたる農業用土壌の問題に最小限に寄与します.
科学分野:
- 農業科学 農業科学とは
- 環境科学 環境科学
- 土壌科学は,土壌科学である.
背景:
- 土壌酸性化は,中国の集中農業システムにおける重要な問題である.
- 土壌のpH値の低下は,作物生産と土壌の健康に脅威をもたらします.
研究 の 目的:
- 中国の主要作物生産地域における土壌酸性の変化を評価する.
- これらの農業用土壌における土壌酸化の主な要因を特定する.
主な方法:
- 土壌のpHの変化を評価するために2つの全国調査を利用しました.
- 多くのサイトでペアリングされた比較を行い,長期のモニタリングデータを分析した.
- 窒素循環と塩基カチオン吸収が土壌酸性化に与える量的な貢献.
主要な成果:
- 主要な農業地域では,1980年代から2000年代にかけて,土壌のpHが著しく低下した (P<0.001).
- 窒素サイクルプロセスは,年間1ヘクタールあたり20−221キロモールH+を放出します.
- 塩基カチオンの吸収は,年間1ヘクタールあたり15〜20キロモールH+を増加させた.
- 酸性堆積は,年間1ヘクタールあたり0.4〜2.0キロモールH+を最小限に寄与しました.
結論:
- 集中農業の実践,特に窒素循環と塩基酸塩の吸収は,中国における土壌酸性化の主要な原動力である.
- 酸性堆積は,中国の農業用土壌の酸性化において小さな役割を果たしている.
- 土壌酸性化を緩和し,農業生産性を維持するために緊急の管理戦略が必要である.
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