| 引用本文: | 甘国渝,金慧芳,李燕丽,等.秸秆及其生物炭添加对土壤Olsen-P及磷素组分的影响[J].灌溉排水学报,0,():-. |
| ganguoyu,jinhuifang,liyanli,et al.秸秆及其生物炭添加对土壤Olsen-P及磷素组分的影响[J].灌溉排水学报,0,():-. |
|
| |
|
|
| 本文已被：浏览 267次 下载 0次 |
|
|
|
| 秸秆及其生物炭添加对土壤Olsen-P及磷素组分的影响 |
|
甘国渝1, 金慧芳1, 李燕丽1, 杨军1, 李继福1, 姚荣江2, 杨劲松2, 朱海1
|
|
1.长江大学;2.中国科学院南京土壤研究所
|
|
| 摘要: |
| 【目的】为研究和对比秸秆和生物炭添加对土壤磷素含量及Olsen-P含量变化的影响，以江汉平原典型水稻土为研究对象，进行了室内恒温土培试验。【方法】试验设置不同水分模拟旱地和水田两种土地利用方式，分别设高量生物炭（BC2）、低量生物炭（BC1）、高量秸秆（SC2）、低量秸秆（SC1）和无添加（CK）处理，25℃下恒温培养30 d。利用Hedley磷素形态分级法对各处理土壤进行磷素分级，同时测定土壤Olsen-P含量及其它理化指标。【结果】在旱地土壤中，添加生物炭使得土壤Olsen-P含量增加了1.78~1.46 mg/kg，添加秸秆使得土壤Olsen-P含量分别增加了4.46~1.72 mg/kg。在水田土壤中，添加生物炭使得土壤Olsen-P含量分别增加了22.42~12.04 mg/kg，添加秸秆使得土壤Olsen-P含量分别增加了6.37~4.27 mg/kg。磷素形态分级结果表明各处理土壤中不同磷素组分含量差异较大，由高到低依次表现为HCl-P＞NaOH-P＞NaHCO3-P＞H2O-P。综合旱地和水田土壤来看，添加生物炭提高了土壤pH、总氮（TN）、可溶性有机碳（DOC）和有机碳（SOC）含量。而添加秸秆提高了土壤总磷（TP）、DOC和SOC含量。添加生物炭处理土壤中，Olsen-P含量与H2O-P、NaHCO3-P、SOC和NH4+-N含量呈极显著正相关。添加秸秆处理土壤Olsen-P含量与NaOH-P、HCl-P、TN和NH4+-N含量呈显著正相关。【结论】可见，生物炭和秸秆还田主要是通过影响土壤pH、TN和SOC含量，促进土壤中Olsen-P的积累，同时改变土壤的磷素分级状况，进而提高土壤供磷水平和能力。 |
| 关键词: 生物炭；秸秆；Hedley磷素形态分级法；Olsen-P |
| DOI： |
| 分类号:中图分类号：S565 文献标识码：A |
| 基金项目:国家自然科学基金项目（42207414、42107370）、湖北省教育厅中青年人才项目（Q20181303）和长江大学湿地生态与农业利用教育部工程研究中心开放基金项目（KF202115）共同资助 |
|
| Effects of straw and biochar addition on soil Olsen-P and phosphorus fractions |
|
ganguoyu1, jinhuifang1, liyanli1, yangjun1, lijifu1, yaorongjiang2, yangjingsong2, zhuhai1
|
|
1.Yangtze University;2.Nanjing Institute of Soil Sciences, Chinese Academy of Sciences
|
| Abstract: |
| 【Background】In order to investigate and compare the effects of straw and biochar addition on soil phosphorus content and Olsen-P content, a typical paddy soil was collected to carried out an 30 days indoor incubation experiment. 【Methods】Dry land and paddy field were simulated by controlling soil water content. For each land use type, five treatments were set including high amount of biochar (BC2), low amount of biochar (BC1), high amount of straw (SC2), low amount of straw (SC1) and no addition (CK). Phosphorus fractions was classified by Hedley phosphorus speciation method, the content of Olsen-P and other soil physicochemical indexes were also meansured at the same time. 【Result】 In dryland soil, biochar addition increased the content of Olsen-P with the amount of increase ranges from 1.78 to 1.46 mg/kg, and straw addition increased the content of Olsen-P with the amount of increase ranges from 4.46 to 1.72 mg/kg, respectively. In paddy field soil, adding biochar increased soil Olsen-P content with the amount of increase ranges from 22.42 to 12.04 mg/kg, and adding straw increased soil Olsen-P content with the amount of increase ranges from 6.37 to 4.27 mg/kg, respectively. The phosphorus fractionation results showed that the phosphorus components in each treatment were quite different, and the phosphorus components displayed a pattern in order of HCl-P>NaOH-P>NaHCO3-P>H2O-P. In terms of soil physicochemical indexes, the addition of biochar increased soil pH, total nitrogen (TN), soluble organic carbon (DOC) and organic carbon (SOC) content. The addition of straw increased soil total phosphorus (TP), DOC and SOC contents. Furthermore, in the biochar treated soil, the content of Olsen-P was significantly positively correlated with the content of H2O-P, NaHCO3-P, SOC and NH4+-N; in the straw treated soil, the content of Olsen-P was significantly positively correlated with the content of NaOH-P, HCl-P, TN and NH4+-N. 【Conclusion】we can conclude that biochar and straw addition promote the accumulation of Olsen-P in the soil mainly by affecting the content of soil pH, TN and SOC, and change the soil phosphorus components at the same time, thereby improving the level and ability of soil phosphorus supply. |
| Key words: Biochar; Straw; Hedley phosphorus speciation classification; Olsen-P |
|
|
|
|
