摘要
土壤团聚体的组成和稳定性是评价土壤质量的重要指标,土壤胶结物质是团聚体形成的物质基础,两者密切相关.通过研究不同施肥处理下团聚体胶结物质含量的变化,阐明采煤塌陷区复垦土壤团聚体的分布与形成机制.设不施肥(CK)、施化肥(NPK)、单施有机肥(M)和有机无机肥配施(MNPK)4个处理,另取未复垦生土(RS)和周边未破坏多年种植的熟土(US)作为参照.采集耕层(0-20 cm)非扰动的土样,利用干筛法分析团聚体(> 2、0.25-2、0.053-0.25 mm)和粉黏粒组分(<0.053 mm)的分布比例,测定团聚体有机胶结物质(多糖、富里酸、胡敏酸和有机碳)和无机胶结物质(碳酸钙和颗粒组成)的含量.结果表明,同RS相比,各施肥处理均显著提高了> 0.25 mm机械稳定性团聚体的数量(R0.25),增幅为5.32%-5.94%,但是均显著降低了平均重量直径(mean weight diameter,MWD)(除M处理外),降幅为7.51%-9.83%,而M处理显著提高了几何平均直径(geometric mean diameter,GMD),增幅为5.65%.同CK相比,各施肥处理对大团聚体(> 0.25 mm)以及粉黏粒组分(<0.053 mm)的分布比例无显著影响,仅M和MNPK处理显著降低了微团聚体(0.053-0.25 mm)的分布比例,降幅为49.45%-62.40%.各施肥处理对富里酸含量无显著影响.NPK处理仅显著降低了土壤有机碳含量.M处理显著提高了土壤有机碳和碳酸钙含量,却显著降低了土壤黏粒含量.而MNPK处理显著提高了土壤各胶结物质含量(除富里酸和黏粒外).胶结物质与机械稳定性团聚体的分布比例和稳定性的冗余分析结果表明,各胶结物质中,仅胡敏酸对机械稳定性团聚体的分布比例和稳定性变化的解释率达到了显著水平(P <0.05),能够解释57.1%机械稳定性团聚体的分布比例和稳定性变化,并且其单独贡献率为75.9%.综上所述,经过6年培肥,同未复垦土壤相比,各施肥处理显著提高了大团聚体的数量,但同周边农田土壤相比,仍有待进一步培肥提�
The composition and stability of soil aggregates are important indicators for evaluating soil quality,and soil cementing materials are the basis for aggregate formation. These are closely related to each other.The distribution and formation mechanisms of reclaimed soil aggregates in coal mining subsidence areas were clarified in this study by studying the changes in the aggregate cementing material content under different fertilization regimes. This study involved four different fertilization treatments: CK(no fertilizer), NPK(chemical fertilizer alone), M(manure alone), and MNPK(chemical fertilizer combined with manure). In addition,unreclaimed raw soil(RS) and the surrounding undamaged multi-year cultivated mature soil(US) were used as references. The cultivated layer(0–20 cm) soil samples were collected, and the distribution of aggregates(< 2, 0.25–2, 0.053–0.25 mm) and < 0.053 mm silt and clay fractions were analyzed by dry sieving. The contents of aggregate cementing materials, including organic cementing materials(polysaccharide, fulvic acid,humic acid, and organic carbon) and inorganic cementing materials(calcium carbonate, sand, silt, and clay),were also determined. Compared with RS, all fertilization treatments significantly increased the number of macroaggregates(R0.25) by 5.32%–5.94%. However, the mean weight diameter(MWD) significantly decreased by 7.51%–9.83%(except for M treatment), and M treatment significantly increased the geometric mean diameter(GMD) by 5.65%. Compared with CK, different long-term fertilization treatments had no significant effects on the distribution of > 2 mm, 0.25–2 mm aggregates and < 0.053 mm silt and clay fractions. M and MNPK treatments significantly decreased the distribution of 0.053–0.25 mm aggregates by 49.45%–62.40%. None of the fertilization treatments had any significant effect on fulvic acid content. The NPK treatment significantly decreased soil organic carbon content. The M treatment significantly increased the soil organic carbon and calcium car
作者
高健永
王楚涵
张慧芳
曹寒冰
谢钧宇
洪坚平
李廷亮
孟会生
GAO Jianyong;WANG Chuhan;ZHANG Huifang;CAO Hanbing;XIE Junyu;HONG Jianping;LI Tingliang;MENG Huisheng(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province,Taiyuan 030031,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2022年第4期1042-1050,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(41807102,U1710255-3)
土壤环境与养分资源山西省重点实验室开放基金项目(2020001,2019003)
山西省优秀博士,博士后来晋工作奖励项目(SXBYKY2021004)
山西省高等学校科技创新项目(2019L0363)
山西农业大学科技创新基金(博士科研启动)项目(2020BQ50)和山西农业大学“杰青优青培育工程”项目(2022YQPYGC05)资助。
关键词
施肥
复垦土壤
团聚体稳定性
胶结物质
胡敏酸
fertilization
reclaimed soil
aggregate stability
cementing material
humic acid
