保护地不同灌溉方式下土壤碳库管理指数的研究

Soil C Pool Management Index of Different Irrigation Methods in Protected Field

以沟灌、滴灌和渗灌3种灌溉方法进行保护地长期定位灌溉试验，保护地分3层采取0～45cm土层的土壤样品，测定供试土壤的总有机碳、活性有机碳含量，计算出碳库管理指数，研究了不同灌溉方法对保护地土壤总有机碳和活性有机碳的影响。结果表明，土壤总有机碳和活性有机碳均随土层的加深而减少。在0～15cm和15～30cm土层，3种灌溉处理土壤的总有机碳含量顺序为滴灌〉渗灌〉沟灌，而30～45cm的总有机碳含量顺序则为渗灌〉滴灌〉沟灌；各层次土壤活性有机碳含量排列顺序均为渗灌〉滴灌〉沟灌，且30～45cm土层渗灌与沟灌的差异达到了5％显著水平；各灌溉处理、不同深度土层的土壤碳库管理指数大小排列顺序均为渗灌〉滴灌〉沟灌，但只有15～30cm土层滴灌、渗灌的碳库管理指数与沟灌的差异达到了5％显著水平。

The experiment of different irrigation methods include furrow irrigation, drip irrigation and subsurface irrigation was conducted for a long term, and soils were sampled at different 3 depths within 45 cm, and determined the content of soil total organic carbon, active carbon and counted CPMI（carbon pool management index）. The effect of different irrigation methods on total organic carbon and active carbon was studied in a protected field. The results indicated that the content of soil total organic carbon and active carbon were decreased with deeper layer. In 0 to 15 cm and 15 to 30 cm soil layer the order of soil total organic carbon was drip irrigation〉subsurface irrigation 〉furrow irrigation, and 30 to 45 cm soil layer the order of soil total organic carbon was subsurface irrigation〉 drip irrigation〉furrow irrigation. Different soil layer soil active carbon order was subsurface irrigation〉drip irrigation〉furrow irrigation, and the content of soil active carbon in 30 to 45 cm soil layer subsurface irrigation treatment was significantly higher compared to furrow irrigation treatment at the 5% level. CPMI order of different irrigation methods and different soil layers was subsurface irrigation〉 drip irrigation〉 furrow irrigation, none but in 15 to 30 cm soil layer subsurface irrigation treatment and drip irrigation treatment were significantly higher than furrow irrigation treatment for CPMI at 5% level.