Shaaban Muhammad, Wang Xiao-Ling, Song Peng, Hou Xiaogai, Wu Yupeng, Hu Ronggui
College of Agriculture, Henan University of Science and Technology, Luoyang, 471023, China.
College of Agriculture, Henan University of Science and Technology, Luoyang, 471023, China.
Environ Res. 2023 Nov 15;237(Pt 2):117059. doi: 10.1016/j.envres.2023.117059. Epub 2023 Aug 31.
Soil nitrous oxide (NO) emissions are alarming for global warming and climate change. NO reduction is carried out only by nosZ gene encoded NO-reductase, which is highly sensitive to acidic pH and copper (Cu) contents. Therefore, a microcosm study was conducted to examine the attribution of soil pH management, Cu supply and nosZ gene abundance for NO emission mitigation. Cu was applied at the dose of 0, 10, 25 and 50 mg kg to three acidic soils (Soil 1, 2 and 3) without and with dolomite (0 and 5 g kg). Cu application and soil pH increment substantially enlarged the abundance of nosZ gene, and consequently mitigated soil NO emissions; highest reduction with 25 Cu mg kg. Decline in NH and subsequently accumulation of NO, and large contents of MBC and DOC in dolomite treated soils led to a substantial NO reduction. The cumulative NO emissions were lowest in the treatment of 25 Cu mg kg with dolomite application for each soil. Results suggest that soil pH increment, an adequate Cu supply, and nosZ gene abundance can potentially lower soil NO emissions in acidic soils.
土壤一氧化二氮（N₂O）排放对全球变暖和气候变化构成严重威胁。只有由nosZ基因编码的N₂O还原酶才能实现N₂O减排，而该酶对酸性pH值和铜（Cu）含量高度敏感。因此，开展了一项微观研究，以探讨土壤pH值调控、铜供应和nosZ基因丰度对减轻N₂O排放的作用。向三种酸性土壤（土壤1、2和3）施加0、10、25和50 mg/kg剂量的铜，且添加和不添加白云石（0和5 g/kg）。施用铜和提高土壤pH值显著增加了nosZ基因的丰度，从而减少了土壤N₂O排放；25 mg/kg铜的减排效果最佳。白云石处理土壤中NH₄⁺减少，随后NO₃⁻积累，且微生物量碳（MBC）和溶解性有机碳（DOC）含量较高，导致N₂O大量减少。每种土壤在施用25 mg/kg铜并添加白云石的处理中，N₂O累积排放量最低。结果表明，提高土壤pH值、充足的铜供应和nosZ基因丰度可能会降低酸性土壤中的N₂O排放。
