Daily Variation of Soil Greenhouse Gas Fluxes in Rubber Plantations Under Different Levels of Organic Fertilizer Substitution

文献类型： 外文期刊

第一作者： Zhang, Wangxin

作者： Zhang, Wangxin;Ran, Hongyu;Lu, Wen;Ali, Waqar;Yang, Qiu;Liu, Wenjie;Chen, Qingmian;Xu, Wenxian;Liu, Wenjie;Fang, Mengyang;Yang, Huai

作者机构：

关键词： fertilization treatment; soil greenhouse gas fluxes; daily variation; optimal sampling time

期刊名称：FORESTS （ 影响因子：2.5； 五年影响因子：2.7 ）

ISSN：

年卷期： 2025 年 16 卷 4 期

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收录情况： SCI

摘要： It has been widely recognized that replacing chemical fertilizers with organic fertilizers (organic substitution) could significantly increase the long-term productivity of the land and potentially enhance resilience to climate change. Nevertheless, there is limited information on the accurate monitoring of soil greenhouse gas (GHG) fluxes at different levels of organic substitution in rubber plantations. Before accurate estimation of soil GHG fluxes can be made, it is important to investigate diurnal variations and suitable sampling times. In this study, six treatment groups of rubber plantations in the Longjiang Farm of Baisha Li autonomous county, Hainan Island, including the control (CK), conventional fertilizer (NPK), and organic substitution treatments in which organic fertilizer replaced 25% (25%M), 50% (50%M), 75% (75%M), and 100% (100%M) of chemical nitrogen fertilizer were selected as study objectives. The soil GHG fluxes were observed by static chamber-gas chromatography for a whole day (24 h) during both wet and dry seasons. The results showed the following: (1) There was a significant single-peak daily variation of GHGs in rubber plantation soils. (2) The soil GHG fluxes observed from 9:00-12:00 are closer to the daily average fluxes. (3) Organic fertilizer substitution influenced soil CO2 and N2O fluxes and had no significant effect on soil CH4 fluxes. Fluxes of soil CO2 and N2O increased firstly and then decreased gradually when the substitution ratios exceeded 50% or 75%. (4) Soil CO2 and N2O fluxes were positively correlated with soil temperature and soil moisture, and CH4 fluxes were negatively correlated with soil temperature and soil moisture in both wet and dry seasons. The study indicated that understanding the daily pattern of GHG changes in rubber forest soils under different levels of organic fertilizer substitution and the optimal observation time could improve the accurate assessment of long-timescale observation studies.

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