施用硅酸盐肥料可减少毛竹林土壤温室气体排放。
Silicate fertilizer application reduces soil greenhouse gas emissions in a Moso bamboo forest.
机构信息
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; School of Environmental and Resources Science, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China; School of Environmental and Resources Science, Zhejiang A&F University, Lin'an, 311300 Zhejiang, China.
出版信息
Sci Total Environ. 2020 Dec 10;747:141380. doi: 10.1016/j.scitotenv.2020.141380. Epub 2020 Aug 6.
Silicate fertilizer application in croplands is effective in mitigating soil methane (CH) emissions and increasing rice yield. However, the effects of silicate fertilizer on soil greenhouse gas (GHG) emissions in Moso bamboo forests, and the underlying mechanisms are poorly understood. In the present study, a two-year field experiment was conducted to investigate the effect of silicate fertilizer rates (0 (CK), 0.225 and 1.125 Mg ha) on soil GHG emissions in a Moso bamboo forest. The results showed that silicate fertilizer application significantly reduced soil CO and NO emissions, and increased soil CH uptakes. Compared to the CK treatments, the cumulative soil CO emission fluxes decreased by 29.6% and 32.5%, and the cumulative soil NO emission fluxes decrease by 41.9% and 48.3%, the CH uptake fluxes increased by 13.5% and 32.4% in the 0.225 and 1.125 Mg ha treatments, respectively. The soil GHG emissions were significantly positively related to soil temperature (P < 0.05), but negatively related to soil moisture; however, this relationship was not observed between CH uptake fluxes and moisture in CK treatment. Soil CO emission and CH uptake were significantly positively related with water-soluble organic C (WSOC) and microbial biomass C (MBC) concentrations in all treatments (P < 0.05). Soil NO emissions were significantly positively related to MBC, NH-N, NO-N, and microbial biomass N (MBN) concentrations in all treatments (P < 0.05), but not with WSOC concentration. Structural equation modeling showed that application of silicate fertilizer directly reduced soil GHG emission by decreasing the labile C and N pools, and indirectly by influencing the soil physicochemical properties. Our findings suggest that silicate fertilizer can be an effective tool in combatting climate change by reducing soil GHG emissions in Moso bamboo forests.
农田施用硅酸盐肥料可有效减少土壤甲烷（CH）排放并提高水稻产量。然而，硅酸盐肥料对毛竹林土壤温室气体（GHG）排放的影响及其潜在机制尚不清楚。本研究通过为期两年的田间试验，研究了硅酸盐肥料用量（0（CK）、0.225 和 1.125 Mg ha）对毛竹林土壤 GHG 排放的影响。结果表明，硅酸盐肥料的施用显著降低了土壤 CO 和 NO 的排放，并增加了土壤 CH 的吸收。与 CK 处理相比，0.225 和 1.125 Mg ha 处理下的累积土壤 CO 排放通量分别降低了 29.6%和 32.5%，累积土壤 NO 排放通量分别降低了 41.9%和 48.3%，CH 吸收通量分别增加了 13.5%和 32.4%。土壤 GHG 排放与土壤温度显著正相关（P<0.05），但与土壤水分呈负相关；然而，在 CK 处理中，CH 吸收通量与水分之间未观察到这种关系。在所有处理中，土壤 CO 排放和 CH 吸收与水溶性有机碳（WSOC）和微生物生物量 C（MBC）浓度显著正相关（P<0.05）。在所有处理中，土壤 NO 排放与 MBC、NH-N、NO-N 和微生物生物量 N（MBN）浓度显著正相关（P<0.05），但与 WSOC 浓度无关。结构方程模型表明，硅酸盐肥料的施用通过降低可利用的 C 和 N 库直接减少土壤 GHG 排放，通过影响土壤理化性质间接减少土壤 GHG 排放。本研究结果表明，硅酸盐肥料可以通过减少毛竹林土壤 GHG 排放成为应对气候变化的有效工具。
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