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秸秆覆盖大幅增加竹林土壤碳排放

2025-06-19 13:06 by 独眼巨人的笑声

在南方的毛竹林里,冬季覆盖秸秆是常见的管理措施——农民用稻草、竹枝等材料覆盖地表,既能保温保湿,又能促进春笋提前上市,增加经济收益。但这种看似“常规”的操作,却可能悄悄改变土壤与大气间的碳交换。浙江大学研究团队在浙江湖州的毛竹林中设置了“无覆盖”、 “一年覆盖”、 “连续三年覆盖”三组处理,持续监测覆盖期和覆盖材料移除后的“长期效应期”土壤CO2排放及相关指标。结果发现,覆盖期间,秸秆覆盖区的土壤CO2排放量比无覆盖区高出约18倍。这主要是因为覆盖材料像“保温被”一样提高了土壤温度,为微生物活动和竹鞭、竹笋生长创造了更适宜的环境,加速了土壤有机质分解和植物根系呼吸。值得注意的是,即便在覆盖物移除后的“长期效应期”,碳排放仍比未覆盖区域高出230%–270%。此时,土壤温度对排放的影响减弱,而土壤养分成为关键驱动因素——覆盖过程中,秸秆及配套的猪粪等材料分解后,显著提升了土壤中有机碳、氮、磷等养分含量,为微生物提供了更丰富的“食物”,持续刺激其活性,从而维持了较高的CO2排放水平。

www.eurekalert.org/news-releases/1087996?language=chinese

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秸秆覆盖大幅增加竹林土壤碳排放

2025-06-19 13:06 by 独眼巨人的笑声

在南方的毛竹林里,冬季覆盖秸秆是常见的管理措施——农民用稻草、竹枝等材料覆盖地表,既能保温保湿,又能促进春笋提前上市,增加经济收益。但这种看似“常规”的操作,却可能悄悄改变土壤与大气间的碳交换。浙江大学研究团队在浙江湖州的毛竹林中设置了“无覆盖”、 “一年覆盖”、 “连续三年覆盖”三组处理,持续监测覆盖期和覆盖材料移除后的“长期效应期”土壤CO2排放及相关指标。结果发现,覆盖期间,秸秆覆盖区的土壤CO2排放量比无覆盖区高出约18倍。这主要是因为覆盖材料像“保温被”一样提高了土壤温度,为微生物活动和竹鞭、竹笋生长创造了更适宜的环境,加速了土壤有机质分解和植物根系呼吸。值得注意的是,即便在覆盖物移除后的“长期效应期”,碳排放仍比未覆盖区域高出230%–270%。此时,土壤温度对排放的影响减弱,而土壤养分成为关键驱动因素——覆盖过程中,秸秆及配套的猪粪等材料分解后,显著提升了土壤中有机碳、氮、磷等养分含量,为微生物提供了更丰富的“食物”,持续刺激其活性,从而维持了较高的CO2排放水平。

www.eurekalert.org/news-releases/1087996?language=chinese

#长城

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