摘要
通过盆栽模拟试验,用静态箱法采样,气相色谱测定样品CO2浓度,研究大豆出苗到开花期长期定量施肥土壤CO2排放速率的变化规律。结果表明,长期定量施肥大豆生长对土壤呼吸影响有明显的规律性,NPK+OM>NPK>NP>NK>CK;长期定量施肥对裸土呼吸速率影响较小,NPK+OM呼吸速率较大为53.8mgCm-2h-1,NP次之为50.7mgCm-2h-1,其它施肥影响不大,气温对裸土呼吸影响较大,而对种植大豆的土壤呼吸前期(出苗后9天)影响较大,生长后期(出苗9天以后)影响较小。裸土呼吸速率变化与气温变化趋势相似,种植大豆促进土壤呼吸增大。如果忽略大豆生长对土壤有机质分解的激发效应,大豆根际呼吸占总土壤呼吸的23%～56%。
The diurnal changes of soil respiration in black soil from germination to flowering stage of soybean and the influencing factors were investiganted with static dark chamber method and gas chromatograph technique in pot experiment. Results showed that soybean growth affected soil respiration under long-term quantitative fertilization （NPK＋OM〉NPK〉NP〉NK〉CK）. Temperature affected soil respiration from germination to the 9th day. Respiration rate in no planted soil varied with temperature, but increased in soybean planting treatment. Soybean rhizosphere respiration was 23%-56% of total soil respiration.
出处
《土壤通报》
CAS
CSCD
北大核心
2007年第5期887-890,共4页
Chinese Journal of Soil Science
基金
国家重点基础研究发展计划(973计划)(2005CB121101)
黑龙江省自然科学项基金资助项目(C200615)
中国科学院野外台站基金
关键词
长期定量施肥
大豆
黑土呼吸
Long-term quantitative fertilization
Soybean
Soil respiration
