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热带地理  2014 

生物炭对岩溶区玉米生长、土壤co2及岩溶作用的影响

, PP. 511-517

Keywords: 生物炭,石灰土,玉米生物量,土壤co2,岩溶作用

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Abstract:

?为研究生物炭对岩溶区玉米生长、土壤co2体积分数和排放速率及岩溶作用的影响,通过野外盆栽试验,将蔗渣生物炭分别以土壤质量分数为0%(ck)、0.5%(t1)、1%(t2)、2%(t3)和5%(t4)添加到石灰土中,并栽培玉米。测定玉米生育期中土壤co2体积分数和排放速率、土壤淋溶水中ca2+和质量分数;并测试玉米收割后土壤有机碳质量分数和容重及玉米生物量。结果表明,添加生物炭增加土壤有机碳质量分数,显著降低了土壤容重;2%和5%生物炭添加显著增加了玉米秸秆干重、玉米棒干重和玉米根干重;在玉米苗期,5%生物炭添加显著增加了土壤co2体积分数和排放速率;在玉米拔节期、抽穗期和成熟期,2%和5%生物炭添加显著增加了土壤co2体积分数、排放速率以及在此期间收集的土壤淋溶水ca2+和质量分数。由此可见,蔗渣生物炭作为岩溶区石灰土改良剂,在一定程度上改良石灰土性质,促进了玉米生长,提高了岩溶区土壤co2的体积分数和排放速率,加快了岩溶作用。

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