菜地土壤有机碳分级以及总量变化的动态特征研究

Fertilisers significantly affect crop production and crop biomass inputs to soil organic carbon（SOC）. However, the long-term effects of fertilisers on C associated with aggregates are not yet fully understood. Based on soil aggregate and SOC fractionation analysis, this study investigated the long-term effects of organic manure and inorganic fertilisers on the accumulation and change in SOC and its fractions, including the C concentrations of free light fraction, intra-aggregate particulate organic matter（POM） and intra-aggregate mineral-associated organic matter（MOM）. Long-term manure applications improved SOC and increased the concentrations of some C fractions. Manure also accelerated the decomposition of coarse POM（cPOM） into fine POM（fPOM） and facilitated the transformation of fPOM encrustation into intra-microaggregate POM within macroaggregates. However, the application of inorganic fertilisers was detrimental to the formation of fPOM and to the subsequent encrustation of fPOM with clay particles, thus inhibiting the formation of stable microaggregates within macroaggregates. No significant differences were observed among the inorganic fertiliser treatments in terms of C concentrations of MOM, intra-microaggregate MOM within macroaggregate（imMMOM） and intra-microaggregate MOM（imMOM）. However, the long-term application of manure resulted in large increases in C concentrations of MOM（36.35%）, imMMOM（456.31%） and imMOM（19.33%） compared with control treatment.     

氮素补充对高寒草甸土壤团聚体有机碳、全氮分布的影响

土壤结构的稳定性对高寒草甸生态系统有重要意义。为研究不同水平氮素补充对高寒草甸草地土壤团聚体、有机碳和全氮含量及分布格局的影响,于2012-2014年在青藏高原东部夏河县进行3 a的试验研究。试验为随机区组设计,包括0(对照)、50(低氮)、100(中氮)和200(高氮)kg/hm2 4个氮素补充水平。研究结果表明:低、中、高水平氮素补充处理显著提高了0~30 cm土层≥0.25 mm大团聚体质量分数(P0.05),比对照分别提高了4.74%、6.42%和1.96%;较之对照,低、中水平氮素补充处理显著增加了≥5 mm、≥2~5 mm粒级团聚体含量;低、中水平氮素补充处理显著提升了0~30 cm土壤团聚体平均质量直径,分别比对照提升了9.79%和12.63%。不同水平氮素补充处理有机碳、全氮含量大小排序分别为:中氮≈低氮对照高氮、中氮低氮≈高氮对照。不同粒级团聚体中0.25 mm微团聚体有机碳含量最高而全氮含量最低、≥0.25~2 mm粒级有机碳含量最低而全氮含量最高;低、中水平氮素补充提高了不同粒级团聚体0~30 cm土层有机碳含量而高水平氮素补充处理显著降低了有机碳含量;低、中、高水平氮素补充增加了不同粒级团聚体全氮含量,其中中水平氮素补充处理最高,低水平氮补充次之。不同粒级团聚体含量是影响团聚体养分贡献率的主要原因,≥2~5 mm粒级团聚体含量与相应粒级团聚体有机碳含量呈显著正相关关系,≥5 mm和≥2~5 mm粒级团聚体含量与相应粒级团聚体全氮含量分别呈极显著正相关、显著正相关关系。研究表明连续每年补充50~100 kg/hm2氮可以改善高寒草甸土壤结构并提高土壤肥力状况。     

Fire and Tillage as Degrading Factors of Soil Structure in Northern Zagros Oak Forest,West Iran

The effects of fire and the conversion to vineyard on soil organic carbon (SOC), and soil aggregate size distribution and stability were studied in a forest of Iran. For this purpose, topsoil was sampled in an unburned area, a portion of the forest burned three years earlier, and a vineyard, all three contiguous and showing similar topographic features. In the burned forest, soil was sampled in areas undergone high, moderate, or low severity. Air‐dried soil samples were sieved to obtain four aggregate size classes, which were subsequently wet sieved. Soil aggregate distribution index, mean weight diameter, geometric mean diameter, and aggregate stability index were determined on both dry and wet specimens. No significant differences in SOC between burned and unburned forest were found, most probably because of the supply of charred biomass to soil, while in the vineyard thirty years of cultivation had removed half of initial SOC. Both severe fire and cultivation had decreased the stability of aggregates and the relative amount of the biggest ones (8 to 2‐cm diameter). However, aggregate stability was significantly lower in the vineyard than in the burned forest, which points out to a stronger impact of prolonged cultivation than a single fire, although severe. Cultivation and severe fire had decreased the proportion of C in macroaggregates, to the advantage of meso (1 to 0.25 mm) and micro (<0.25 mm) aggregates. A hierarchical cluster analysis of all investigated properties and indices demonstrated that cultivation and highly severe fire both were causes of soil degradation. Copyright © 2016 John Wiley & Sons, Ltd.     

Soil organic carbon and nitrogen in aggregates in response to over seven decades of farmyard manure application

The study aimed to evaluate the effects of long-term fertilisation on soil aggregation and the associated changes in soil organic carbon (SOC) and nitrogen (N) pools in aggregates. The combined application of mineral fertiliser and manure improved soil aggregation, SOC and N content in aggregates, compared to manure or mineral fertiliser alone, and thus proved to be a suitable fertilisation strategy to increase C sequestration in agroecosystems.     

长期施用不同有机物料对土壤团聚体特征的影响

农业有机物料是重要的资源,为研究施用不同有机物料对土壤水稳性团聚体分布、稳定性及有机碳的影响,采用对照(CK)、玉米秸秆(Str)、堆肥(C)、牛粪(PM)、沼渣(BgR)、生物炭(BC)6种处理,通过田间7年定位试验,利用湿筛法得到不同粒级的土壤水稳性团聚体,测定土壤有机碳含量,计算了水稳性团聚体平均质量直径(MWD)、几何平均直径(GMD)值、分形维数(D)和土壤不稳定团粒指数(E_(LT))。结果表明:与对照相比,5种不同有机物料处理下0~15 cm土层水稳性大团聚体(0.25 mm)含量、平均质量直径(MWD)、几何平均直径(GMD)、土壤有机碳含量显著增加(P0.05),分形维数(D)、土壤不稳定团粒指数(E_(LT))显著减小(P0.05),土壤团聚体结构稳定性明显得到增强。土壤有机碳与水稳性大团聚体(0.25mm)含量间呈现出极显著正相关关系(P0.001)。生物炭和秸秆处理的团聚体稳定性变化最为明显,土壤结构改善效果最好,生物炭、沼渣处理最有利于促进土壤有机碳的累积。各处理15~30 cm土层,土壤团聚体及有机碳含量差异不显著(P0.05)。采取施用不同有机物料的方式对耕地进行保育,显著提高了耕作层水稳性大团聚体含量和有机碳含量,增强了团聚体结构稳定性,改善了土壤结构和肥力状况。     

铵、钾同时存在时, 土壤对铵的优先吸附

The water stability of aggregates in various size classes separated from 18 samples of red soils under different managements, and the mechanisms responsible for the formation of water-stable soil aggregates were studied. The results showed that the water stability of soil aggregates declined with increasing size, especially for the low organic matter soils. Organic matter plays a key role in the formation of water-stable soil aggregates. The larger the soil aggregate size, the greater the impact of organic matter on the water stability of soil aggregates. Removal of organic matter markedly disintegrated the large water-stable aggregates (> 2.0 mm) and increased the small ones (< 0.25-0.5mm) to some extent, whereas removal of free iron(aluminium) oxides considerably destroyed aggregates of all sizes, especially the < 0.25-0.5 mm classes. The contents of organic matter in water-stable aggregates increased with aggregate sizes. It is concluded from this study that small water-stable aggregates (< 0.25-0.5 mm) were chiefly cemented by Fe and Al oxides whilst the large ones (> 2.0 mm) were mainly glued up by organic matter. Both free oxides and organic matter contribute to the formation and water stability of aggregates in red soils.     

不同肥力水平土壤团聚体的稳定性及对氮肥盐溶液的响应

在室内利用筛分技术研究了关中地区相同质地类型3个不同肥力水平土团聚体的组成及其稳定性,并在4个不同浓度氯化铵溶液中进行湿筛,探讨了不同肥力土壤团聚体对盐溶液的反应特征及抗化学物质分散的能力,以便揭示长期施用无机氮肥对土壤团聚体的作用与影响。结果表明,干、 湿筛结果显示3个肥力水平土壤直径＞0.25 mm团聚体的含量均随肥力水平的升高显著增加,供试土团聚体的水稳性较差,湿筛后直径＜0.25 mm的微团聚体含量在85%以上,而富有农学价值的直径在15 mm的水稳性团聚体在高肥力土壤中含量仅为2.80%,中肥力土壤为1.47%,低肥力土壤为0.84%。3种肥力土壤团聚体组成受氯化铵溶液浓度的影响,在4种浓度的氯化铵溶液中湿筛后,直径25 mm的团聚体的含量随溶液浓度增大而减少,而0.252 mm团聚体含量明显增加。试验得到的主要结论为, 不同肥力水平土壤团聚体质量差异明显; 团聚体的化学稳定性受盐溶液浓度和肥力水平的共同作用,随氮肥溶液浓度增大,团聚体组成集中在0.252 mm的较小范围,盐分使得多级的团聚体组成向单一化方向变化; 高肥力土壤受氮肥溶液的影响相对较弱,中、 低肥力土壤对氮肥溶液的响应则较为强烈。     

Effect of biochar on soil structure and storage of soil organic carbon and nitrogen in the aggregate fractions of an Albic soil

ABSTRACT

Field experiment was conducted to evaluate the effect of corn straw derived-biochar (700 °C) applied at 0 (control), 10 (B1), 20 (B2) and 30 t ha^?1 (B3) on water stable aggregate (WSA), mean weight diameter (MWD), total organic carbon (TOC) and total nitrogen (TN) in WSA fractions of Albic soil. Compared with control, WSA in > 2 mm fraction increased, by 40.8% and 51.5% (0–10 cm depth) in B1 and B3, respectively. B1, B2 and B3 (10–20 cm depth) increased by 55.2%, 69.6% and 62.4%, respectively. MWD increased by 34.4%, 21.6%, and 17.6% with B3 at 0–10 cm, 10–20 cm and 20–30 cm depths, respectively. TOC in the > 2 mm fraction increased by 28.6%, 22.1%, and 23.2% (0–10 cm depth) in B1, B2, and B3, respectively, TN in 2–0.5 mm fractions increased by 32.4%, 23.4% and 33.6% (0–10 cm depth); and in the 0.25–0.05 mm fractions increased by 14.8%, 19.8% and 18.7% (10–20 cm depth), in B1, B2 and B3, respectively. Our findings suggest biochar application at 30 t ha^?1 could improve structural stability and sequestration of TOC and TN in Albic soils.     

长期施肥棕壤团聚体分布及其碳氮含量变化

【目的】探究玉米-玉米-大豆轮作体系不同施肥处理对土壤团聚体分布及其有机碳、全氮的影响,以期深入了解施肥对土壤培肥、改善土壤结构的机制。【方法】选取不施肥（CK）,化肥（NPK）,低量有机肥（M1）,低量有机肥与化肥配施（M1NPK）,高量有机肥（M2）,高量有机肥与化肥配施（M2NPK）6个处理。采集棕壤37年长期定位试验微区不同施肥处理的0-20 cm和20-40 cm土样,分析其水稳性团聚体（ 1 mm、1~0.5 mm、0.5~0.25 mm、0.25~0.053 mm及 0.053 mm）分布及其有机碳、全氮分配特征。【结果】棕壤长期施肥对团聚体分布及其碳氮的影响0-20 cm大于20-40 cm,随土层深度的增加,有机碳（SOC）、全氮（TN）含量减少。各处理团聚体及碳、氮在团聚体中的分配主要在黏粉粒中（40%以上）。与CK相比,NPK处理显著提高了黏粉粒的含量,降低大团聚体与微团聚体含量,显著增加黏粉粒储碳比例;M1、M2处理显著增加 1 mm团聚体数量及其SOC含量,显著增加 0.25 mm各粒级团聚体的储碳比例,且M2处理显著高于M1处理;M1NPK、M2NPK处理也显著增加 1 mm团聚体数量及其SOC含量,M1NPK与M2NPK处理在NPK处理的基础上依次增加0.5~0.25 mm（M1NPK）、1~0.5 mm及 1 mm团聚体的储碳比例,M2NPK处理 0.25 mm团聚体储碳比例最高,土壤团聚体全氮的变化趋势与有机碳类似。【结论】棕壤连续有机无机配合施用可显著增加土壤大团聚体数量、SOC、TN含量及其储碳、氮比例,是提高土壤质量、改善土壤结构的有效施肥措施。     

不同施肥处理对黑垆土各粒级团聚体中有机碳含量分布的影响

依托中国科学院黄土高原长武农业生态试验站中的长期定位试验(始于1984年),利用湿筛法获得不同粒径的团聚体,研究了长期施肥对不同粒级水稳性团聚体中有机碳分布的影响。试验涉及化肥和轮作培肥两个长期试验的9个处理。化肥试验:同一施磷基础上的5个施氮水平(N0、N45、N90、N135、N180);轮作培肥试验:不施肥(CK)、化肥(NP)、有机肥(M)、化肥有机肥配施(NPM)。结果表明:长期施肥显著影响土壤水稳性团聚体含量(p0.05),提高了2mm粒级水稳性团聚体含量,降低了0.25mm水稳性团聚体含量。施氮(N45、N90、N135、N180)处理主要提高了5mm、0.5～0.25mm水稳性团聚体中有机碳的含量,与N0相比,提高量为44.3%～73.3%;有机肥(M、NPM)处理对各粒级团聚体中有机碳的含量均有提高,与CK相比,提高量为40.7%～92.2%,其中5mm团聚体中有机碳含量分别提高了66.7%和92.2%。低氮(N0、N45、N90)处理、不施肥(CK)处理的1～0.5mm团聚体中的有机碳对土壤有机碳的贡献率最大,占13.7%～23.7%;高氮(N135、N180)处理和氮磷配施(NP)处理、有机肥(M、NPM)处理的5mm团聚体中的有机碳对土壤有机碳的贡献率最大,占17.3%～24.9%。土壤有机碳与5mm、5～2mm团聚体含量呈显著正相关关系,与0.25mm团聚体含量呈极显著负相关。     

生物炭施用下潮土团聚体微生物量碳氮和酶活性的分布特征

[目的]探究生物炭配施化肥对不同粒级团聚体中微生物量碳、氮(MBC、MBN)含量和胞外酶活性的影响,分析影响团聚体胞外酶活性变化的主控因素,为提升土壤质量提供科学依据.[方法]田间微区试验在河南现代农业研究基地进行,供试土壤为石灰性潮土.设置4个处理:不施肥(CK)、单施化肥(NPK)、单施生物炭(BC)和生物炭配施化...     

生物炭碳固定于稳定性土壤团聚体中：土壤黏土矿物及其它土壤性质的作用

Aggregation and structure play key roles in water-holding capacity and stability of soils.In this study,the incorporation of carbon(C) from switchgrass biochar into stable aggregate size fractions was assessed in an Aridisol(from Colorado,USA) dominated by 2:1 clays and an Alfisol(from Virginia,USA) containing weathered mixed 1:1 and 2:1 mineralogy,to evaluate the effect of biochar addition on soil characteristics.The biochar was applied at 4 levels,0,25,50,and 100 g kg~(-1),to the soils grown with wheat in a growth chamber experiment.The changes in soil strength and water-holding capacity using water release curves were measured.In the Colorado soil,the proportion of soil occurring in large aggregates decreased,with concomitant increases in small size fractions.No changes in aggregate size fractions occurred in the Virginia soil.In the Colorado soil,C content increased from 3.3 to 16.8 g kg~(-1),whereas in the53 μm fraction C content increased from 5.7 to 22.6 g kg~(-1) with 100 g kg~(-1)biochar addition.In the Virginia soil,C content within aggregate size fractions increased for each size fraction,except the2 000 μm fraction.The greatest increase(from 6.2 to 22.0 g kg~(-1)) occurred in the 53–250 μm fraction.The results indicated that C was incorporated into larger aggregates in the Virginia soil,but remained largely unassociated to soil particles in the Colorado soil.Biochar addition had no significant effect on water-holding capacity or strength measurements.Adding biochar to more weathered soils with high native soil organic content may result in greater stabilization of incorporated C and result in less loss because of erosion and transport,compared with the soils dominated by 2:1 clays and low native soil organic content.     

Soil organic carbon,nitrogen, and phosphorus distribution in stable aggregates of an Ultisol under contrasting land use and management history

Different land‐use affects the organization of mineral soil particles and soil organic components into aggregates and the consequent arrangement of the aggregates will influence essential ecosystem functions. We investigated a continuous rubber plantation (forested), land fallowed for 10 y (fallow), 10‐y continuous arable cropping land and cropped land with top soil removed (TSR) for concentrations of C, N, and P in bulk soil and dry aggregates. Results showed that a high level of soil disturbance decreased the proportion of surface (0–15 cm) soil aggregate stability (low mean weight diameter) in TSR by 149% and arable cropping by 125% compared with the forested. Aggregate associated SOC was higher in aggregate‐size fractions of forested land‐use when compared with that in 10‐y fallow, continuous arable cropping, and TSR. For aggregate associated N, fallow and forested land‐use types concentrated higher proportion across aggregate sizes than the arable cropping and TSR. Macro aggregate fractions generally contained higher concentrations of C, N, and P compared with the micro‐aggregates. Water transmission indicators like total porosity and saturated hydraulic conductivity recorded higher values with forested and fallow land‐use than the others. We can thus conclude that long‐term soil disturbance due to cultivation and removal of top soil reduces the accumulation of soil C, N, and P in bulk soil and decreases water transmission properties. On the other hand, aggregate‐associated C, N and P accumulations are dependent on the level of soil surface disturbance and aggregate sizes.     

复种模式对豫西褐土团聚体稳定性及其碳、氮分布的影响

[目的]长期单一的玉米–小麦复种模式会引起土壤结构破坏、农田生产力下降.探究不同复种模式对农田土壤团聚体稳定性及其碳、氮分布的影响,为维持土壤结构稳定,实现农业可持续发展提供科学依据.[方法]定位试验在河南洛阳褐土上进行.设置冬小麦–夏玉米(T1)、冬小麦–夏花生(T2)、冬小麦–夏玉米||花生间作(2行玉米间作4行花...     

长期培肥下红壤有机碳组成与团聚体稳定性的关系

为研究培肥措施对红壤有机碳组成和团聚体稳定性的影响,以及有机碳与团聚体稳定性的关系,通过长期定位实验,选取不同施肥措施(未培肥CK、化肥NPK、化肥+秸秆NPKS和粪肥AM)下的典型红壤为研究对象,分析土壤有机碳组成和团聚体稳定性差异,揭示3种施肥措施下不同层次的有机碳组成和团聚体稳定性的变化规律.结果表明,3种施肥措施均可以提高土壤表层(0 ～25 cm)有机碳质量分数(尤其是颗粒有机碳),其中AM效果最显著,NPKS次之.不同施肥措施下红壤不同层次的团聚体稳定性顺序为AM＞ NPKS＞ NPK＞ CK.与CK相比,AM处理对表下层(5～15 cm)土壤的总有机碳和团聚体稳定性的提高效果最显著.回归分析表明,颗粒有机碳(POC)与湿筛法平均质量直径以及快速湿润(FW)、慢速湿润(SW)、预湿润震荡(WS)3种处理的平均质量直径的相关性最好(R2 =0.79、0.80、0.66、0.81),说明相对于其他组分,颗粒有机碳更有利于降低消散作用以及抵抗机械破碎进而增强团聚体稳定性,是间接评价土壤团聚体稳定性的良好指标.     

添加水稻秸秆对不同类型土壤团聚体分布和稳定性的影响

以不同类型土壤(红壤、潮土、砂姜黑土)为研究对象,通过室内模拟试验,研究水稻秸秆添加对3种类型土壤水稳性团聚体分布及稳定性的影响。培养温度为28℃,培养时间为120d。研究结果表明:未添加水稻秸秆的3种类型土壤(对照组),微团聚体(250μm)占主体,2 000μm粒级水稳性团聚体含量最少。与对照相比,添加水稻秸秆后促使2 000μm粒级水稳性团聚体显著增加(p0.05),大团聚体(250μm)占主体。红壤、潮土、砂姜黑土试验组250μm水稳性团聚体比对照组增加的比例分别为35.6%,41.1%,22.0%,潮土的增加比例最为明显。3种类型土壤水稳性团聚体的平均重量直径(MWD),几何平均直径(GMD)显著增加(p0.05),分形维数(D)值、土壤不稳定团粒指数(ELT)显著减少,土壤结构和抗侵蚀能力明显得到改善,潮土的稳定性指标变化最为明显,团聚体结构改善效果最好。3种类型土壤0.25mm(R0.25)水稳性团聚体含量与GMD,MWD间呈极显著正相关关系(p0.001)。     

耕作对土壤有机物和土壤团聚体稳定性的影响

Agricultural sustainability relates directly to maintaining or enhancing soil quality. Soil quality studies in Canada during the 1980‘s showed that loss of soil organic matter (SOM) and soil aggregate stability was standard features of non-sustainable land management in agroecosystems. In this study total soil organic carbon (SOC), particulate organic matter (POM), POM-C as a percentage of total SOC, and aggregate stability were determined for three cultivated fields and three adjacent grassland fields to assess the impact of conventional agricultural management on soil quality. POM was investigated using solid-state ^13C nuclear magnetic resonance (NMR) to determine any qualitative differences that may be attributed to cultivation. Results show a highly significant loss in total SOC, POM and aggregate stability in the cultivated fields as compared to the grassland fields and a significant loss of POM-C as a percentage of total SOC.Integrated results of the NMR spectra of the POM show a loss in carbohydrate-C and an increase in aromatic-C in the cultivated fields, which translates to a loss of biological lability in the organic matter. Conventional cultivation decreased the quantity and quality of SOM and caused a loss in aggregate stability resulting in an overall decline in soil quality.     

中亚热带四种森林土壤团聚体及其有机碳分布特征

选择中亚热带地区4种典型森林类型:杉木林、湿地松林、毛竹林和次生林4种森林土壤为研究对象,研究了森林类型对土壤不同发生层水稳性团聚体及其有机碳分布特征的影响。结果表明:不同森林类型对>5 mm和2~5 mm土壤团聚体含量影响显著(p<0.05),表现为次生林>杉木林>毛竹林>湿地松林,而在其他粒径无显著差异。0~30 cm土层内团聚体R0.25和MWD次生林显著高于其他人工林,杉木林次之,湿地松林和毛竹林最低,其他土层无显著差异。各森林类型同土层不同粒径团聚体中有机碳含量随粒径大小变化,团聚体粒径越小,有机碳含量越高。0~10 cm土层同粒径土壤团聚体有机碳含量从大到小依次是次生林、杉木林、湿地松林和毛竹林,而在其他土层各森林类型之间差异不显著。     

中国黄土高原区轮耕对土壤团聚体、有机碳氮含量的影响

In rain-fed semi-arid agroecosystems, continuous conventional tillage can cause serious problems in soil quality and crop production, whereas rotational tillage (no-tillage and subsoiling) could decrease soil bulk density, and increase soil aggregates and organic carbon in the 0-40 cm soil layer. A 3-year field study was conducted to determine the effect of tillage practices on soil organic carbon (SOC), total nitrogen (TN), water-stable aggregate size distribution and aggregate C and N sequestration from 0 to 40 cm soil in semi-arid areas of southern Ningxia. Three tillage treatments were tested: no-tillage in year 1, subsoiling in year 2, and no-tillage in year 3 (NT-ST-NT); subsoiling in year 1, no-tillage in year 2, and subsoiling in year 3 (ST-NT-ST); and conventional tillage over years 1-3 (CT). Mean values of soil bulk density in 0-40 cm under NT-ST-NT and ST-NT-ST were significantly decreased by 3.3% and 6.5%, respectively, compared with CT, while soil total porosity was greatly improved. Rotational tillage increased SOC, TN, and water-stable aggregates in the 0-40 cm soil, with the greatest effect under ST-NT-ST. In 0-20 and 20-40 cm soils, the tillage effect was confined to the 2-0.25 mm size fraction of soil aggregates, and rotational tillage treatments obtained significantly higher SOC and TN contents than conventional tillage. No significant differences were detected in SOC and TN contents in the >2 mm and <0.25 mm aggregates among all treatments. In conclusion, rotational tillage practices could significantly increase SOC and TN levels, due to a fundamental change in soil structure, and maintain agroecosystem sustainability in the Loess Plateau area of China.     

施肥措施对复垦土壤团聚体碳氮含量和作物产量的影响

研究复垦后不同施肥措施下有机碳(OC)和全氮(TN)在水稳性团聚体及粉黏粒组分中的分布特征,以期深入理解不同施肥措施下土壤有机碳的固持机制。以生土和连续6年不同施肥措施的复垦土壤为研究对象,采集0～20 cm耕层土壤样品,利用湿筛法进行土壤粒径分组,分析大粒径大团聚体(> 2 mm)、小粒径大团聚体(>0.25～2 mm)、微团聚体(0.053～0.25 mm)和粉黏粒组分(<0.053 mm)中OC和TN含量,判断各粒径团聚体及粉黏粒组分中有机碳储量的驱动因素,探究团聚体及粉黏粒组分中有机碳含量与作物产量之间的关系。试验设不施肥(CK)、施氮磷钾化肥(NPK)、单施有机肥(M)和有机无机肥配施(MNPK)4个处理。结果表明:1)整个试验周期(2008—2013年),同CK相比,NPK、M以及MNPK处理均显著提高了玉米籽粒产量,且以MNPK处理的效果最显著,分别提高了79.49%、116.07%和113.85%。2)大团聚体和微团聚体中OC和TN含量相近,总体高于粉黏粒组分。同生土相比,CK、NPK和M处理均显著提高了>0.25～2、0.053～0.25 mm...