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引用本文:倪进治,徐建民,谢正苗,王德建.不同施肥处理下土壤水溶性有机碳含量及其组成特征的研究[J].土壤学报,2003,40(5):724-730. DOI:10.11766/trxb200203130513
Ni Jin-zhi,Xu Jian-min,Xie Zheng-miao,Wang De-jian.CONTENTS OF WSOC AND CHARACTERISTICS OF ITS COMPOSITION UNDER DIFFERENT FERTILIZATION SYSTEMS[J].Acta Pedologica Sinica,2003,40(5):724-730. DOI:10.11766/trxb200203130513
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不同施肥处理下土壤水溶性有机碳含量及其组成特征的研究
倪进治1,2, 徐建民1, 谢正苗1, 王德建3
1.浙江大学土水资源与环境研究所, 杭州, 310029;2.中国科技大学地球与空间科学学院, 合肥, 230026;3.中国科学院南京土壤研究所, 南京, 210008
摘要:
长期不同施肥处理下,土壤水溶性有机碳(WSOC)含量范围为321~455mgkg-1,大小顺序为NPK+4500kg稻草>NPK+2250kg稻草>对照>NPK;WSOC占土壤总有机碳(TOC)百分比的范围为015%~019%,大小顺序为NPK+4500kg稻草≈对照>NPK+2250kg稻草>NPK。土壤中WSOC的含量与TOC、微生物生物量碳(SMBC)的含量都呈显著性正相关。13C核磁共振(13CNMR)的研究结果表明,WSOC都主要是由碳水化合物C、羧基C和长链脂肪C组成。不同施肥处理下,WSOC和SMBC占TOC百分比的变异系数(CV)都小于它们在土壤中绝对含量的变异系数,且WSOC/TOC的变异系数大于SMBC/TOC。WSOC/TOC是反映不同施肥处理下土壤有机质质量的一个较好指标。
关键词:  施肥  水溶性有机碳  13C-NMR  结构特征  有机质质量
DOI:10.11766/trxb200203130513
分类号:
基金项目:* 国家重点基础研究发展规划项目(批准号:G1999011809);高等学校骨干教师资助计划;浙江省自然科学基金(批准号:RC99032)资助
CONTENTS OF WSOC AND CHARACTERISTICS OF ITS COMPOSITION UNDER DIFFERENT FERTILIZATION SYSTEMS
Ni Jin-zhi1,2, Xu Jian-min1, Xie Zheng-miao1, Wang De-jian3
1.Dept. of Resource Sciences, Zhejiang University, Hongzhou 310029, China;2.Dept. of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;3.Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
Abstract:
Under a long-term experiment on different fertilization treatments, the contents of water-soluble organic carbon (WSOC) in the soil ranged from 32.1 to 45.5 mg kg-1, following the order of NPK+4500 kg rice straw>NPK+2250 kg rice straw>CK>NPK. The percentages of WSOC to total soil organic carbon (TOC) ranged from 0.15% to 0.19%, following the order of NPK+4500 kg rice straw≈CK>NPK+2250 kg rice straw>NPK. The contents of WSOC had significantly positive correlations with both TOC and soil microbial biomass carbon(SMBC). 13C-NMR results showed that WSOC were mainly com posed of carbohydrates carbon, carboxyl carbon and long-chain aliphatic carbon. Under different fertilization treatments, the coefficients of variation (CV) of WSOC/TOC and SMBC/TOC were lower than those of their absolute contents in soil. Furthermore, the CV of WSOC/TOC was higher than that of SMBC/TOC. The percentage of WSOC to TOC was a good indicator of the quality of soil organic matter under different fertilization treatments.
Key words:  Fertilization  Water-soluble organic carbon  13C-NMR  Structure characteristics,Quality of soil organic matter