Ren Xiaoying, Yang Wenwen, Ye Liping, Lin Siyan, Li Yuan, Wang Weiqi, Sardans Jordi, Chen Junma, Chen Shiyu, Yu Siqi, Hou Li, Tariq Akash, Peñuelas Josep
Key Laboratory of Ecological-Geographic Processes in Humid Subtropics, Ministry of Education, Fujian Normal University, Fuzhou, 350117, China.
Fuzhou Economic Crops Technical Station, Fuzhou, 350001, China.
J Environ Manage. 2025 Aug;389:126282. doi: 10.1016/j.jenvman.2025.126282. Epub 2025 Jun 19.
Reducing chemical fertilizer use while enhancing soil organic carbon (SOC) stability, through straw return and biochar amendment presents an integrated strategy for climate change mitigation and sustainable agriculture. However, the effectiveness of their carbon (C) sequestration potential and organic C pool stability is influenced by varing environmental conditions. This study investigated the effects of straw and biochar on C sequestration potential and SOC pool stability in jasmine garden soil in Fuzhou, China. Six treatments were compared: No Fertilizer (Control), Fertilizer (F) (NPK fertilizer), No Fertilizer + Straw (NF + S), Fertilizer + Straw (F + S), No Fertilizer + Biochar (NF + B), and Fertilizer + Biochar (F + B). Fertilizer (compound NPK 16:16:16) was applied at a total rate of 260 kg·ha-1, split into two applications of 130 kg·ha-1 each. Straw and biochar were both applied at a rate of 8000 kg·ha-1 each. We measured mineral-associated organic C (MAOC), particulate organic C (POC), their binding mechanisms, and key physicochemical properties. The results showed that, compared to the control, NF + B significantly increased MAOC (13.29 %; p < 0.05). Biochar application (F + B and NF + B) significantly increased POC (150.57 %-211.34 %) and calcium-bound organic C (Ca-SOC) (22.22 %-31.94 %; p < 0.05), with more pronounced effects in the absence of fertilizer. Both straw and biochar applications significantly improved soil pH (2.74 %-15.40 %) and decreased soil bulk density (BD) (10.08 %-26.36 %; p < 0.05), while straw significantly increased electrical conductivity (EC) (17.91 %-35.82 %; p < 0.05). Furthermore, both straw and biochar amendments significantly increased SOC (34.66 %-57.18 %), easily oxidizable organic C (EOC) (23.35 %-48.58 %), and dissolved organic C (DOC) (15.98 %-93.00 %; p < 0.05). Redundancy analysis (RDA) showed that pH (70.4 % variance explained) and SOC (7.5 % variance explained) were the dominant drivers of SOC pool stability. These findings suggest that biochar amendment, particularly without chemical fertilizers, represents a promising strategy for enhancing soil C sequestration and stability in jasmine gardens. This approach holds significant potential for sustainable agricultural practices and climate change mitigation in subtropical regions.
通过秸秆还田和生物炭改良来减少化肥使用，同时提高土壤有机碳（SOC）稳定性，是一种应对气候变化和实现可持续农业的综合策略。然而，它们的碳（C）固存潜力和有机碳库稳定性的有效性受到不同环境条件的影响。本研究调查了秸秆和生物炭对中国福州茉莉花种植园土壤碳固存潜力和SOC库稳定性的影响。比较了六种处理：不施肥（对照）、施肥（F）（氮磷钾复合肥）、不施肥+秸秆（NF+S）、施肥+秸秆（F+S）、不施肥+生物炭（NF+B）和施肥+生物炭（F+B）。施肥（复合氮磷钾16:16:16）总量为260 kg·ha-1，分两次施用，每次130 kg·ha-1。秸秆和生物炭的施用量均为8000 kg·ha-1。我们测量了与矿物相关的有机碳（MAOC）、颗粒有机碳（POC）、它们的结合机制以及关键的物理化学性质。结果表明，与对照相比，NF+B显著增加了MAOC（13.29%；p<0.05）。施用生物炭（F+B和NF+B）显著增加了POC（150.57%-211.34%）和钙结合有机碳（Ca-SOC）（22.22%-31.94%；p<0.05），在不施肥的情况下效果更明显。施用秸秆和生物炭均显著提高了土壤pH值（2.74%-15.40%）并降低了土壤容重（BD）（10.08%-26.36%；p<0.05），而秸秆显著增加了电导率（EC）（17.91%-35.82%；p<0.05）。此外，施用秸秆和生物炭均显著增加了SOC（34.66%-57.18%）、易氧化有机碳（EOC）（23.35%-48.58%）和溶解有机碳（DOC）（15.98%-93.00%；p<0.05）。冗余分析（RDA）表明，pH值（解释了70.4%的方差）和SOC（解释了7.5%的方差）是SOC库稳定性的主要驱动因素。这些发现表明，特别是在不使用化肥的情况下，生物炭改良是提高茉莉花种植园土壤碳固存和稳定性的一种有前景的策略。这种方法在亚热带地区的可持续农业实践和气候变化缓解方面具有巨大潜力。
