| 摘要: |
| 以华北平原玉米‖大豆为研究对象,研究间作对农田土壤CO2、CH4和N2O排放的影响,在此基础上对系统净温室气体平衡(Net greenhouse gas balance,△GWP)进行评价。结果表明,整个生育期玉米单作处理(M)的CO2累积排放最高(12.6 t/hm2),玉米大豆间作处理比M处理减少4.0%~8.9%。M处理的土壤N2O排放最高(16.0 kg/hm2),显著高于间作处理,间作处理比M减少32.2%~36.6%(P<0.05)。间作和单作处理间土壤CH4排放没有显著差异(P>0.05)。土壤CO2排放动态主要与土壤温度显著相关,而土壤N2O排放则主要与土壤水分含量显著相关(P<0.05)。不同系统的△GWP不同,M系统的△GWP为8 681 kg/hm2,高于等行距间作系统(6 635 kg/hm2),而低于宽窄行间作系统(9 753 kg/hm2)。结果显示,合理的玉米‖大豆间作模式能够减少农田温室气体排放。 |
| 关键词: 玉米‖大豆间作 土壤温室气体 净排放潜力 |
| DOI：10.11841/j.issn.1007-4333.2015.04.09 |
| 投稿时间：2014-10-09 |
| 基金项目:"十二五"国家科技支撑计划项目(2012BAD14B03,2011BAD16B15);中央级科研院所基本科研业务费(1630022014019) |
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| Effect of maize-soybean intercropping on greenhouse gas emission and the assessment of net greenhouse gas balance in North China Plain |
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HUANG Jian-xiong1,2, SUI Peng1, GAO Wang-sheng1, CHEN Yuan-quan1
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| (1.College of Agriculture and Biotechnology, China Agricultural University, Beijing 100193, China;2.Rubber Research Institute/Danzhou Investigation & Experiment Station of Tropical Crops of Ministry of Agriculture, China Tropical Agriculture Science Institute, Danzhou 571737, China) |
| Abstract: |
| The effect of maize-soybean intercropping on soil greenhouse gas (GHG) emission and net GHG balance (△GWP) of agricultural systems in North China Plain were investigated.Results showed that in the whole growing season the highest accumulative soil CO2 emissions (12.6 t/hm2), were observed in the treatment of monocultural maize (M), which were 4.0%-8.9% higher than that in the intercropping treatments.Accumulative soil N2O emissions were highest in the M treatment (16.0 kg/hm2), which were 32.2%-36.6% higher than that in the intercropping treatments (P<0.05).There was no significant difference on soil CH4 emissions between intercropping and monoculture treatments (P>0.05).The Pearson's correlation assay showed that soil CO2 emissions were mainly related to soil temperature, while soil N2O emissions were mainly correlated with soil water content (P<0.05).Results also showed that △GWP differed between agricultural systems.The △GWP of M treatment was 8 681 kg/hm2, which was higher than that in the intercropping system with equal planting space (6 635 kg/hm2) but lower than that with wide-narrow planting space (9 753 kg/hm2), indicating that appropriate intercropping system has a potential for reducing GHG emissions and △GWP in corn production in North China Plain. |
| Key words: maize-soybean intercropping soil greenhouse gas potential of net greenhouse gas emission |
