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不同温度及化肥绿肥施用比例对果园土壤有机碳矿化的影响
作者: 王 峰a  王义祥b  陈玉真a  吴志丹a  江福英a  尤志明a  张文锦a  翁伯琦b *  
单位: (福建省农业科学院 a 茶叶研究所  福建 福安 355015;b 农业生态研究所  福州 350013)  
关键词: 果园土壤  温度  化肥  绿肥  施用比例  土壤有机碳矿化  
分类号:S152.4
出版年,卷(期):页码:2012 ,43 ( 12 ): 页码:1991-1996
摘要:

【Objective】This research aimed to understand the different responses of organic carbon mineralization to green manure fertilizers on orchard soil under different temperatures in order to provide parameters for constructing the orchard ecosystem carbon cycle model. 【Method】By the indoor culture simulation test (culturing period lasting for 85 d), under the 3 temperature conditions of 10, 20, and 30℃, effects of different proportions of chemical nitrogen fertilizer and green manure (no fertilization, 100% nitrogen fertilizer, 75% chemical nitrogen fertilizer+25% green manure, 50% chemical nitrogen fertilizer+50% green manure, 25% chemical nitrogen fertilizer+75% green manure, and 100% green manure; each nitrogen fertilizer application rate was 0.15 gN/kg in dry soil) were discussed and the influential characteristics of organic carbon mineralization in orchard soil were studied. 【Result】The organic carbon mineralization rates in fertilization soil maintained higher levels during the beginning of the culturing period, but rapidly declined afterwards; during the late culturing period, the organic carbon mineralization rates remained relatively stable. The cumulative soil organic carbon mineralization emissions were 1439.4-4732.8 mg/kg, hence the cumulative emission of CO2 after the whole green manure soil treatment reached maximum. Soil organic carbon mineralization rate increased as the temperature rose, and the temperature sensitivity (Q10) of different garden soil manure organic carbon mineralization also differed. The temperature sensitivity of soil organic carbon mineralization under the no fertilization treatment was at minimum, while sensitivity under the 25% chemical nitrogen fertilizer+75% green manure treatment was at maximum. Difference between each treatment was distinctively significant. 【Conclusion】Different proportions of fertilizer and green manure application increased the temperature sensitivity in soil organic carbon mineralization; also, the combined action of nitrogen fertilizer, green manure, and temperature could cause increased CO2 emission from the orchard into the atmosphere.

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