| 长期不同施肥制度对红壤性水稻土活性有机质及碳库管理指数的影响 |
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| 作者姓名： | 吴小丹 蔡立湘 鲁艳红 谢坚 廖育林 郑圣先 聂军 |
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| 作者单位： | 中南大学研究生院隆平分院,湖南省土壤肥料研究所,农业部望城水稻生态环境重点野外观测实验站 |
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| 基金项目： | 国家"十一五"科技支撑计划项目
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中加合作项目
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| 摘 要： | 【研究目的】以长期定位试验点的红壤性水稻土为研究对象,探讨长期不同施肥制度对红壤性水稻土活性有机质和碳库管理指数的影响。【方法】采用3种浓度的KMnO4(33、167、333mmol/L)氧化法测定土壤高活性有机质、中活性有机质和活性有机质3部分含量。【结果】研究表明:红壤性水稻土中的活性有机质以中活性有机质为主。连续种植25a水稻后,CK处理的土壤活性有机质含量降低,CMI(碳库管理指数)下降。各施肥处理的土壤有机质、活性有机质组分含量和碳库管理指数均有所增加,CMI以NPK RS处理上升最大,NK处理最小。土壤活性有机质含量和CMI的增幅大于土壤总有机质的增幅,水稻产量与CMI的相关性达到极显著水平。【结论】长期化肥与有机肥、稻草配合施用能明显增加红壤水稻土活性有机质组分和水稻产量。CMI可以作为评价土壤质量的指标。
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| 关 键 词： | 有机质 活性有机质 碳库管理指数 土壤质量 |
Effects of Long-term Fertilization Systems on Soil Labile Organic Matter and Carbon Management Index of Reddish Paddy Soil |
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| Authors: | Wu Xiao-Dan Li-Xiang Cai yan-hong lu jian xie yu-lin liao sheng-xian zheng jun nie |
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| Abstract: | OBJECTIVE]Effects of long-term fertilization on labile organic matter and carbon management index(CMI)in reddish paddy soil were studied in order to assess soil quality.METHOD]Soil labile organic matter with three fractionations was measured by oxidation of KMnO4,namely,high labile organic matter(measured by oxidation of 33mmol/L KMnO4),middle labile organic matter(measured by oxidation of 167 mmol/L KMnO4),and labile organic matter(measured by oxidation of 333 mmol/L KMnO4).RESULTS]The results showed that middle labile organic matter was the main part among labile organic matter in the reddish paddy soil.After 25 years,the labile organic matter in soils with long term of no fertilizer application(CK),and CMI were decreased.Soil total organic matter,labile organic matter content and CMI in the treatments with fertilizer applied were higher than those in CK and soil initial value,and there was significantly increase in labile organic matter and CMI.The CMI in the NPK RS treatment was the highest;whereas the lowest in the NK treatment.The increases in range of soil labile organic matter content and CMI were higher than those of soil total organic matter,of which increase range of CMI was the largest.The correlation between CMI and rice yield was highly significant(p<0.01).CONCLUSION]Combined application of organic manure or rice straw with inorganic fertilizer could increase labile organic matter fractions in the reddish paddy soil of southern China and rice yield.The CMI will be a good index to assess influence of fertilization practice on soil quality. |
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| Keywords: | organic matter labile organic matter carbon management index soil quality |
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