不同耕法下秸秆还田对土壤WSOC荧光特性的影响  

Effects of Straw Returning on Soil WSOC Fluorescence Characteristics with Different Tillage Methods

作　　者：李玉梅[1] 王根林[2] 李承阳 刘峥宇 孟祥海[5] 王伟[1] 邵广忠[5] 胡颖慧[5] LI Yu-mei;WANG Gen-lin;LI Cheng-yang;LIU Zheng-yu;MENG Xiang-hai;WANG Wei;SHAO Guang-zhong;HU Ying-hui(Heilongjiang Academy of Agricultural Sciences Institute of Soil Fertility and Environmental Resources,Harbin 150086,China;Heilongjiang Academy of Agricultural Sciences Institute of Animal Sciences,Harbin 150086,China;Northeast Agricultural University of Biological Science,Harbin 150021,China;Heilongjiang SuiBin Farm,Suibin 154213,China;Mudanjiang Branch of Heilongjiang Academy of Agricultural Sciences,Mudanjiang 157041,China)

机构地区：[1]黑龙江省农业科学院土壤肥料与环境资源研究所,黑龙江哈尔滨150086 [2]黑龙江省农业科学院畜牧研究所,黑龙江哈尔滨150086 [3]东北农业大学生命学院,黑龙江哈尔滨150021 [4]黑龙江省绥滨农场,黑龙江绥滨154213 [5]黑龙江省农业科学院牡丹江分院,黑龙江牡丹江157041

出　　处：《光谱学与光谱分析》2020年第4期1232-1237,共6页Spectroscopy and Spectral Analysis

基　　金：国家重点研发项目(2016YFD0300806);省级资助项目(GX18B013);黑龙江省重点基金项目(ZD2016008,LBH-Q14148)资助。

摘　　要：为探讨秸秆还田对土壤水溶性碳(WSOC)的影响,采用田间定位试验,研究连续免耕、浅翻、深翻与免耕秸秆覆盖、秸秆浅翻及深翻还田方式下,旱地草甸土WSOC随土层深度变化的荧光特征。结果表明:0~50 cm土层, 3种耕法与相应秸秆还田方式土壤WSOC均解析出2类3个荧光组分,即类腐殖质组分C1(240/400 nm)和C2(245, 400/465 nm)及类蛋白质组分C3(220, 275/325 nm);无论浅翻还是深翻, 0~20 cm表土层C1>C2>C3, 20~30 cm土层C3组分的变化与C1, C2组分呈负相关,秸秆还田增加了30~50 cm土层C3组分的含量;荧光指数分析表明,土壤WSOC组成为非生物源与生物源的混合物, 10~20 cm土层异源特征明显,免耕与免耕秸秆覆盖20~50 cm土层自生源特征较强;秸秆深翻还田40~50 cm土层腐殖质的产生和积累趋势增强, C2/C1比值高于秸秆浅翻还田和秸秆覆盖。To study the effect of straw returning on composition of soil water-soluble carbon, the fluorescence spectral characteristics of WSOCwith depth were researched onland meadows with continuous no-tillage, shallow turning, deep turning and no-till cover, shallow and deep straw returning methods, and the results showed that the WSOC was all resolved two types of three fluorescent components in 0~50 cm soil layer with 3 kinds of tillage and corresponding straw returning, namely humus-like components C1(240/400 nm) and C2(245, 400/465 nm) and protein-like component C3(220, 275/325 nm). Regardless of shallow or deep returning, the sequence was C1>C2>C3 in 0~20 cm topsoil, butthe change of C3 composition in 20~30 cm soil layer was negatively correlated with C1 and C2 components. It was also founded that the content of C3 component in 30~50 cm soil layer was increased with continuous straw returning. Fluorescence index analysis showed that the WSOC composition is a mixture of non-biological sources and biological sources, which indicated that the heterogeneous characteristics of the soil layer was obvious in 10~20 cm soil. For the reason of no disturbance to the soil in whole growing season with no-tillage and no-tillage straw cover, the self-generated characteristics in 20~50 cm soil layer was much strong. The ratio of C2/C1 in the 40~50 cm soil layer of straw deep returning was higher than that of shallow tillage and straw cover, indicating that thetenth of humus production and accumulation would be increased.

关 键 词：旱地草甸土 秸秆还田 耕法 WSOC 

分 类 号：S3[农业科学—农艺学]