| 紫花苜蓿与无芒雀麦不同栽培模式下土壤团聚体形态结构、组成及有机碳特征 |
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| 引用本文： | 张家洋,蔺芳,詹乃才,任敏.紫花苜蓿与无芒雀麦不同栽培模式下土壤团聚体形态结构、组成及有机碳特征[J].浙江农林大学学报,2019,36(6):1077-1086. |
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| 作者姓名： | 张家洋 蔺芳 詹乃才 任敏 |
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| 作者单位： | 新乡学院 生命科学技术学院, 河南 新乡 453000 |
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| 基金项目： | 河南省科技攻关项目172102110192河南省科技攻关项目162102110028 |
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| 摘 要： | 通过豫北地区6 a定位试验，以撂荒地为对照，研究了紫花苜蓿Medicago sativa单播、无芒雀麦Bromus inermis单播、紫花苜蓿/无芒雀麦混播3种不同的栽培模式对土壤团聚体组成与有机碳垂直分布的影响，并探讨了两者的相互关系。结果表明:人工草地建植后，土壤团聚体形态结构改善较为明显；土壤机械稳定性团聚体组成以5.00~3.00和3.00~2.00 mm粒径为主（比例为35.55%~57.12%）；土壤水稳性团聚体组成以 < 0.25 mm和3.00~1.00 mm为主（比例为53.47%~74.47%）；无论机械稳定性团聚体还是水稳性团聚体，不同栽培模式下土壤团聚体质量分形维数的大小顺序依次为撂荒地、无芒雀麦单播、紫花苜蓿单播、紫花苜蓿/无芒雀麦混播；土壤总有机碳、活性有机碳和腐殖质碳质量分数均随土层的增加而降低，各栽培模式下0~40 cm土壤有机碳质量分数从大到小依次为紫花苜蓿/无芒雀麦混播、紫花苜蓿单播、无芒雀麦单播、撂荒地；Pearson双侧检验结果显示:总有机碳、活性有机碳以及腐殖质碳质量分数两两之间均具有极显著的相关性（P < 0.01）。机械稳定性和水稳性团聚体的分形维数值均与小粒径团聚体（< 0.25 mm）呈极显著正相关（P < 0.01）。结论:相对于撂荒地，人工建植草地后能够显著改变土壤团聚体的分布，促进土壤固碳，其中又以紫花苜蓿/无芒雀麦混播为最佳栽培模式。
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| 关 键 词： | 土壤学 栽培模式 土壤团聚体 有机碳 分形维数 相关性 |
| 收稿时间： | 2018-10-30 |
Morphological structure,composition, and organic carbon characteristics of soil agglomerations for alfalfa and ryegrass planting patterns |
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| ZHANG Jiayang,LIN Fang,ZHAN Naicai,REN Min.Morphological structure,composition, and organic carbon characteristics of soil agglomerations for alfalfa and ryegrass planting patterns[J].Journal of Zhejiang A&F University,2019,36(6):1077-1086. |
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| Authors: | ZHANG Jiayang LIN Fang ZHAN Naicai REN Min |
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| Institution: | School of Life Science and Technology, Xinxiang University, Xinxiang 453000, Henan, China |
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| Abstract: | Through consecutive location tests in northern Henan Province over 6 years and compared with a waste land, the effects of different planting patterns for alfalfa(Medicago sativa) and ryegrass(Bromus inermis) on the composition of soil aggregate structure and vertical distribution of organic carbon were studied using a correlation analysis. The relationship between the two was also discussed. Results showed that morphological structure of the soil aggregates changed after an artificial grassland was planted. Soil dry-sieving aggregates consisted mainly of 2.00-3.00 mm and 3.00-5.00 mm particle sizes (proportion:35.55%-57.12%); whereas, soil water-stable aggregates were composed of particles < 0.25 mm and 1.00-3.00 mm in size (proportion:53.47%-74.47%). The order of fractal dimensions for both dry-sieving aggregates and water-stable aggregates was wasteland > ryegrass single-sowing > alfalfa single-sowing > alfalfa/ryegrass mixed-sowing. Total organic carbon content, soil active organic carbon, and humus carbon decreased with an increase of soil depth, and organic carbon content in the 0-40 cm soil layer was alfalfa/ryegrass mixed-sowing > alfalfa single-sowing > ryegrass single-sowing > wasteland. Also, a two-sided test for pears showed a highly significant correlation (P < 0.01) to total organic carbon and active organic carbon(r=0.975), active organic carbon and humus carbon(r=0.975), and total organic carbon and humus carbon (r=0.954); and fractal dimension values were highly significant (P < 0.01) and positively correlated to small-particle size aggregates (< 0.25 mm) for both dry-sieving aggregates (r=0.972) and water-stable aggregates (r=0.980). In conclusion, compared to wasteland, the distribution of soil aggregates was greatly changed and soil carbon sequestration was promoted after artificial grassland was planted with alfalfa/ryegrass mixed-sowing being the best planting pattern. |
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