| 长期施肥红壤稻田有机碳演变规律及影响因素 |
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| 引用本文： | 余喜初,李大明,柳开楼,黄庆海,叶会财,徐小林,陈 明,胡惠文.长期施肥红壤稻田有机碳演变规律及影响因素[J].土壤,2013,45(4):655-660. |
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| 作者姓名： | 余喜初 李大明 柳开楼 黄庆海 叶会财 徐小林 陈 明 胡惠文 |
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| 作者单位： | 江西省红壤研究所,国家红壤改良工程技术研究中心/农业部江西耕地保育科学观测实验站,江西进贤331717 |
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| 基金项目： | 公益性行业(农业)科研专项经费项目(201203030和201003016)、国家重点基础研究发展计划(973计划)子课题项目(2011CB100501-S06)资助 |
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| 摘 要： | 利用1981年起设置的水稻土长期施肥定位试验,分析了CK(不施肥)、N(单施氮肥)、NPK(氮磷钾配施)、NPK2(2倍氮磷钾配施)和NPKM(有机无机肥配施)等施肥措施下土壤有机碳的演变规律及其与作物产量和土壤养分(全氮、碱解氮、全磷、速效磷、全钾和速效钾)的相关性.结果表明:试验30年后,各个处理的土壤有机碳含量均有上升,其中CK、N、NPK、NPK2和NPKM的土壤有机碳在试验30年分别比试验前增加18.95％、17.72％、23.36％、16.92％和32.68％.与CK处理相比,NPK、NPK2和NPKM处理的土壤有机碳平均提高了4.09％、4.03％和25.68％.土壤有机碳含量与水稻产量呈显著相关(P＜0.001),相关系数r为0.410,这说明土壤有机碳含量的增加可以促进水稻增产.土壤有机碳与土壤养分中的碱解氮、速效磷和全磷含量均表现出极显著相关(P＜0.001),相关系数r分别为0.452、0.559和0.487,但是与钾含量相关不显著.这表明:有机无机肥配施可以持续快速提高红壤性水稻土的有机碳含量,同时在有机无机肥配施过程中应适当增施钾肥,从而促进土壤肥力平衡和维持作物高产稳产,实现农业可持续性.
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| 关 键 词： | 水稻土 土壤有机碳 土壤养分 长期施肥 |
Evolution and Influencing Factors of Soil Organic Carbon Under Long-term Fertilization in Subtropical Paddy Field of China |
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| YU Xi-chu,LI Da-ming,LIU Kai-lou,HUANG Qing-hai,YE Hui-cai,XU Xiao-lin,CHEN Ming,HU Hui-wen.Evolution and Influencing Factors of Soil Organic Carbon Under Long-term Fertilization in Subtropical Paddy Field of China[J].Soils,2013,45(4):655-660. |
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| Authors: | YU Xi-chu LI Da-ming LIU Kai-lou HUANG Qing-hai YE Hui-cai XU Xiao-lin CHEN Ming HU Hui-wen |
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| Institution: | National Engineering and Technology Research Center for Red Soil Improvement, Scientific Observational and Experimental Station of Arable Land Conservation in Jiangxi, Ministry of Agriculture, Research Institute of Red Soil of Jiangxi Province |
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| Abstract: | The evolution and influencing factors of soil organic carbon under long-term fertilization field experiment carried out from 1981 were studied based on the measurement of soil organic carbon (SOC), rice yield and soil nutrients in Poyang Lake Field Reddish Paddy Soil Pivotal Observational and Experimental Station of Agricultural Ministry. The treatments included CK (no fertilizer), N (nitrogen fertilizer), NPK (combined nitrogen, phosphorus and potassium fertilizers), NPK2 (combination of high rate of nitrogen, phosphorus and potassium fertilizers) and NPKM (combination of nitrogen, phosphorus and potassium fertilizers and organic manure). The results showed that: SOC contents increased after 30 a by 18.95%, 17.72%, 23.36%, 16.92% and 32.68% in CK, N, NPK, NPK2 and NPKM, respectively, and SOC contents of NPK, NPK2 and NPKM increased by 4.09%, 4.03% and 25.68% compared to CK, respectively. SOC content was significant correlated (P<0.001) with grain yield, the correlation coefficient (r) was 0.410, it indicated that the grain yield could be improved by increasing soil SOC. SOC content was also significantly correlated (P<0.001) with alkali solution nitrogen, total phosphorus, available phosphorus, r were 0.452, 0.559 and 0.487, respectively; but was not significant correlated with total potassium in this study. It indicated that it is wise way to combined use of nitrogen, phosphorus and potassium fertilizers and organic manure to improve soil organic carbon quickly and largely in paddy field and should increase the input of potassium fertilizers in combination use of nitrogen, phosphorus and potassium fertilizers and organic manure for maintaining soil fertility balance and ensure higher crop yields. |
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| Keywords: | Paddy soil Soil organic carbon Soil nutrient Long-term fertilization |
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