減窒素条件下での緑肥-小麦輪作体系における緑肥品種の混作が温室効果ガス排出に与える制御効果

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides field-level data on GHG trade-offs under nitrogen reduction and intercropping strategies.

🏢実務担当者:Suggests specific green manure mixtures (e.g., common vetch + rapeseed) for farmers to reduce emissions without yield loss.

🏛政策担当者:Supports policies promoting nitrogen fertilizer reduction and green manure adoption in temperate wheat systems.

生態学的に脆弱な青海高原における低炭素春コムギ生産戦略を探るため、分割区法を用いた2年間の圃場試験を実施した。主区には3つの窒素（N）施用レベルを設定した：N0（0 kg·ha−1、N無投入）、N1（157.5 kg·ha−1、慣行量比30%減肥）、N2（225 kg·ha−1、慣行量）。副区には4つの緑肥混作パターンを設けた：普通ビロードレンゲ単作（CK）、普通ビロードレンゲと裸麦（HB）の混作、普通ビロードレンゲと hairy vetch（HV）の混作、普通ビロードレンゲとセイヨウアブラナ（RS）の混作。緑肥処理全体で平均すると、N1はN2と比較して地球温暖化係数（GWP）を14.56%、温室効果ガス強度（GHGI）を16.89%削減した。N1処理下では、CKと比較して、RSは累積CO2排出量を7.77%、GWPを7.45%削減し、N2と同等のコムギ子実収量を維持し、CKより2.92%低い最小のGHGIを得た。土壌特性に関しては、すべての緑肥パターンがCKと比較して土壌有効リン（AP）と有効カリウム（AK）を有意に増加させた。具体的には、HBはAPを12.81%、AKを16.38%増加させ、RSもAPを4.37%、AKを2.36%増加させた。さらに、HBは土壌有機物（SOM）を5.85%、アンモニア態窒素（NH4–N）を8.13%、硝酸態窒素（NO3–N）を4.34%向上させた。土壌NH4–NとNO3–Nは、処理間のGHGIの主要な駆動要因として特定された。青海チベット高原では、30%の窒素削減と目標指向型の緑肥混作—排出削減にはRS、高収量と肥沃度向上にはHB—を組み合わせることで、春コムギ生産における実行可能な低炭素戦略が提供される。

AI 翻訳（deepseek-v4-flash）。 正確を期す場合は下の原文を参照してください。

To explore low-carbon spring wheat production strategies for the ecologically fragile Qinghai Plateau, a two-year field experiment was conducted using a split-plot design. The main plots were set with three nitrogen (N) application levels: N0 (0 kg·ha−1, no N input), N1 (157.5 kg·ha−1, 30% N reduction relative to conventional rate), and N2 (225 kg·ha−1, the conventional rate). The subplots comprised four green manure mixed cropping patterns: sole cropped common vetch (CK), common vetch mixed with hull-less barley (HB), common vetch mixed with hairy vetch (HV), and common vetch mixed with rapeseed (RS). Averaged across green manure treatments, N1 reduced global warming potential (GWP) by 14.56% and greenhouse gas intensity (GHGI) by 16.89% compared with N2. Under the N1 treatment, compared with CK, RS reduced cumulative CO2 emissions by 7.77% and GWP by 7.45%, maintained wheat grain yield comparable to those under N2, and obtained the minimum GHGI which was 2.92% lower than CK. Regarding soil properties, all green manure patterns significantly increased soil available phosphorus (AP) and available potassium (AK) compared with CK. Specifically, HB increased AP by 12.81% and AK by 16.38%, and RS also increased AP by 4.37% and AK by 2.36%. In addition, HB enhanced soil organic matter (SOM) by 5.85%, ammonium nitrogen (NH4–N) by 8.13%, and nitrate nitrogen (NO3–N) by 4.34%. Soil NH4–N and NO3–N were identified as key drivers of GHGI across treatments. On the Qinghai–Tibet Plateau, a 30% N reduction combined with target-oriented green manure mixtures—RS for emission mitigation and HB for high yield and fertility—offers a viable low-carbon strategy for spring wheat production.

• crossref https://doi.org/10.3390/plants15142194first seen 2026-07-20 05:57:29 · last seen 2026-07-31 07:25:33