2000〜2020年の中国農地炭素収支の時空間動態：収穫炭素とわら還元を組み込んだ評価
Spatiotemporal dynamics of China’s cropland carbon budget from 2000 to 2020: incorporating harvested carbon and straw return (原題)
Dandan Du, Bo Dong, Fengfeng Du, 方彦杰, Xiaofeng Jiang
🤖 gxceed AI 要約
日本語
中国農地（約1.28億ha）を対象に、収穫による炭素持ち出し（HC）とわら還元を組み込んだ純生態系生産（NBP）を2000〜2020年で推計した研究。NEPは増加傾向にあるもののHCの増加率が上回るため、わら還元の有無にかかわらず農地は純炭素源（−136〜−361 Tg C/年）と評価された。収穫炭素を考慮した農地炭素収支の包括的評価手法を提示し、持続的農業の炭素管理に科学的根拠を与える。
English
This study estimates China's cropland carbon budget (2000-2020) by incorporating harvested carbon (HC) and straw return into net biome production (NBP). Although NEP rose, HC increased faster, so croplands acted as a net carbon source under all straw-return scenarios (-136 to -361 Tg C/yr). It offers a comprehensive accounting framework linking harvest and residue management to sustainable agriculture carbon strategies.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
農地・土地利用の炭素収支はScope 3やLULUCF、SBTiのFLAG（森林・土地・農業）ガイダンスと接続する論点であり、食品・農業関連企業のサプライチェーン排出算定に関わる。日本企業が中国産農産物を調達する場合の間接排出評価の参考になりうる。
In the global GX context
Cropland carbon accounting connects to LULUCF, SBTi FLAG guidance, and Scope 3 land-sector emissions, informing how agri-food supply chains report land-based carbon. It adds empirical evidence on harvest and residue management as material drivers of net biome production, relevant to global agricultural carbon frameworks.
👥 読者別の含意
🔬研究者:収穫炭素とわら還元を組み込んだNBP推計手法は、農地炭素収支研究の方法論的参照点となる。
🏢実務担当者:中国産農産物を調達する食品・農業企業が、Scope 3やFLAG算定で土地利用炭素をどう扱うかの示唆を得られる。
🏛政策担当者:農業由来の炭素源・吸収源を政策評価に組み込む際、収穫と残渣管理を考慮すべき根拠を提供する。
📄 Abstract（原文）
Agroecosystems play a crucial role in regulating the terrestrial carbon cycle, especially in China where there are about 128 million hectares of cropland, accounting for about 10% of the global cropland area. Previous regional-scale studies have primarily used net ecosystem production (NEP) to represent cropland carbon uptake, whereas carbon export through crop harvest has received less attention when assessing the overall cropland carbon budget. Moreover, because straw return can retain part of the harvested carbon within cropland ecosystems, the net carbon balance may vary with the extent of straw return. Therefore, this study aimed to characterize carbon dynamics in China’s croplands by estimating net biome production (NBP) under three straw return scenarios, including no return, full return, and regionally differentiated return practices. During 2000–2020, the mean NEP of China’s croplands was 185.5 ± 300.8 g C m −2 yr −1 . After integrating pixel-level NEP estimates over the harvested cropland area, the national cropland NEP was estimated at 157.4 ± 22.9 Tg C yr −1 , whereas total HC reached 518.6 ± 90.5 Tg C yr −1 . Overall, the cropland ecosystem acted as a carbon source in all three scenarios, with national totals of −361.3 ± 69.4 Tg C yr −1 (no straw return), −135.8 ± 31.9 Tg C yr −1 (full straw return), and −233.8 ± 48.3 Tg C yr −1 (regionally differentiated straw return). In addition, both NEP and HC exhibited increasing trends from 2000 to 2020 despite a declining NBP trend due to a higher increasing rate of HC. China’s croplands functioned as a net carbon source when crop harvest was considered during 2000–2020. This study provides a comprehensive assessment of China’s cropland carbon budget by taking into account impacts of harvest and straw‑return practices. The findings improve understanding of the spatiotemporal dynamics of cropland carbon budgets and provide scientific evidence to support carbon management strategies for sustainable agriculture.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1186/s13021-026-00521-6first seen 2026-10-07 05:04:48
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