Effects of long-term vegetation cover changes on the organic carbon fractions in soil aggregates of mollisols
Na LI, Yi-He ZHANG, Xiao-Zeng HAN,*, Meng-Yang YOU, Xiang-Xiang HAONortheast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
Supported by the National Key R&D Program of China(2016YFD0300802-01) the Key Research Program of Frontier Sciences, Chinese Academy of Sciences(QYZDB-SSW-SYS022) the Youth Innovation Promotion Association of Chinese Academy of Sciences(2016211)
Abstract Aims Soil aggregate is the main habitat for decomposition and transformation of soil organic carbon (SOC) and is important to regulate SOC sequestration. The mechanisms of the stability of SOC fractions may vary among different aggregate sizes. The aims of this study were to explore the characteristics of SOC “fractionation” in soil aggregates, and to reveal the mechanisms of carbon (C) sequestration in soil aggregates of mollisols after 31-year changes in vegetation cover. Methods A long-term field experiment with different vegetation cover (grassland, farmland and bareland) was established in National Observation Station of Hailun Agro-ecosystem System. Soil aggregate fractionation, the density and humus fractionation within different aggregate sizes were further carried out. Important findings The results showed that after 31 years of land cover change, the surface SOC and total nitrogen (TN) contents in grassland with higher C inputs increased significantly with time, while the SOC and TN contents decreased significantly in bareland, but with no statistical significance in farmland. The 2-0.25 mm (include 2 mm, the same below) aggregates was the excellent fraction for SOC sequestration under all three land cover. The stability of soil aggregate was in the order of: grassland > farmland > bareland. The mass proportion of soil aggregate and its associated content were highest in grassland, while the proportion of microaggregate and its carbon allocation rate were lowest in grassland. However, due to the lower C inputs in farmland and bareland, the distribution of aggregates was in the order of microaggregate > macroaggregate > silt-clay fraction under these two types of land cover, and organic carbon (OC) content was highest in microaggregates. Different vegetation cover changed the C “fractionation” of density and humus fractions in aggregates. Compared with farmland and bareland soils, OC contents in light fractions in >2 mm and 2-0.25 mm aggregates were higher in grassland, and the OC contents in furic acid, humic acid and humin were highest in 2-0.25 mm aggregates in grassland, while the humus OC accumulated in microaggregates in farmland and bareland. Our results indicated that the plant-derived C entered macroaggregates first, and long-term grass cover enhanced free and light C fractions in macroaggregate, which consequently improved the stability of soil aggregates and enhanced the “fractionation” effects of large aggregates on the humus fractions. Our results revealed the characteristics of carbon sequestration in soil aggregates under different vegetation cover. Keywords:vegetation cover;water-stable aggregates;soil organic carbon;density fraction;humus
PDF (1295KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 引用本文 李娜, 张一鹤, 韩晓增, 尤孟阳, 郝翔翔. 长期不同植被覆盖对黑土团聚体内有机碳组分的影响. 植物生态学报, 2019, 43(7): 624-634. DOI: 10.17521/cjpe.2019.0028 LI Na, ZHANG Yi-He, HAN Xiao-Zeng, YOU Meng-Yang, HAO Xiang-Xiang. Effects of long-term vegetation cover changes on the organic carbon fractions in soil aggregates of mollisols. Chinese Journal of Plant Ecology, 2019, 43(7): 624-634. DOI: 10.17521/cjpe.2019.0028
土壤团聚体是土壤结构的基本单元, 是土壤的重要组成部分, 具有保证和协调土壤水肥气热、影响土壤微生物活性、维持和稳定土壤适宜三相比等作用(李娜等, 2013)。近年来, 土壤团聚体的固碳机制一直是全球碳源汇研究的热点。土壤有机碳(SOC)是土壤团聚结构的重要构成物质, 经微生物的分解转化, 被分解成密度、大小和稳定性不同的组分(Six et al., 2012), 这些组分在胶结物质胶结、矿物吸附和电性吸附等作用下形成不同粒级大小的团聚体(Chenu & Stotzky, 2002), 导致不同粒径大小的团聚体中, 有机碳的数量和稳定程度不尽相同。团聚体内有机碳的生物、物理和化学结合方式是有机碳固定及保护机制研究的重要内容(Six et al., 1998, 2012; Chenu & Stotzky, 2002)。土壤团聚体对有机碳物理保护过程已进行了较多研究(Six et al., 2000, 2004; Lugato et al., 2010), 但对于各粒级团聚体内有机碳的碳固存机制尚无定论。有****认为, 较大粒级团聚体内的有机碳大部分为半腐解态植物残体或松散结合态有机碳和多糖类物质(Beare et al., 1994), 而微团聚体内的有机碳主要来源于微生物代谢产物等较难分解的、腐殖化程度较高的有机物(Chaney & Swift, 1986)。外源物质进入土壤后, 需经一系列的生物化学分解转化过程, 才能转变为土壤有机碳, 土壤团聚体为这一系列过程提供了合适的“场所”, 进而引起有机碳组分在不同粒径团聚体中的“分馏”, 即有机碳被重新分配。分馏所形成的不同活性和密度组分的有机碳只有在合适的“场所”或者与矿质相结合, 形成稳定性有机碳, 才能被长时间保存下来(Bossuyt et al., 2001; 李凯等, 2010)。所以土壤团聚体是土壤固碳的核心。但是, 到目前为止, 关于团聚体的固碳机制还未完全清楚, 团聚体的形成对有机碳的“分馏”特征如何?特别是团聚体内部有机碳密度组分和化学组分分异方面的研究还相对缺乏。
Fig. 1Contents of soil organic carbon and total nitrogen in initial soil and soils under different vegetation covers (mean ± SD). Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers. BL, bareland; FL, farmland; GL, grassland.
Fig. 2Distribution of soil aggregates and mean weight diameter (MWD) of aggregates under different vegetation covers (mean ± SD). Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers.
Fig. 3Contents of organic carbon in soil aggregates fractions under different vegetation covers (mean ± SD). Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers.
Fig. 4Organic carbon contents in different density fractions of aggregates under different vegetation covers (mean ± SD). Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers.
新窗口打开|下载原图ZIP|生成PPT 图5不同植被覆盖下表层全土腐殖质组分的碳含量和腐殖化指标(平均值±标准偏差)。FA, 富里酸; HA, 胡敏酸; HU, 胡敏素。不同小写字母表示处理间差异显著(p < 0.05)。
Fig. 5Contents of organic carbon in humic substances and humification index in bulk soil under different vegetation covers (mean ± SD). FA, fulvic acid; HA, humic acid; HU, humin. Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers.
Fig. 6Contents of organic carbon in soil aggregates under different vegetation covers (mean ± SD). Different lowercase letters above the bar differ at 0.05 levels among different vegetation covers.
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ZhuGY, ShangguanZP, DengL ( 2017). Soil aggregate stability and aggregate-associated carbon and nitrogen in natural restoration grassland and Chinese red pine plantation on the Loess Plateau Catena, 149, 253-260. DOI:10.1016/j.catena.2016.10.004URL [本文引用: 2]
Aggregate-protected and unprotected organic matter pools in conventional- and no-tillage soils 1 1994
... 土壤团聚体是土壤结构的基本单元, 是土壤的重要组成部分, 具有保证和协调土壤水肥气热、影响土壤微生物活性、维持和稳定土壤适宜三相比等作用(李娜等, 2013).近年来, 土壤团聚体的固碳机制一直是全球碳源汇研究的热点.土壤有机碳(SOC)是土壤团聚结构的重要构成物质, 经微生物的分解转化, 被分解成密度、大小和稳定性不同的组分(Six et al., 2012), 这些组分在胶结物质胶结、矿物吸附和电性吸附等作用下形成不同粒级大小的团聚体(Chenu & Stotzky, 2002), 导致不同粒径大小的团聚体中, 有机碳的数量和稳定程度不尽相同.团聚体内有机碳的生物、物理和化学结合方式是有机碳固定及保护机制研究的重要内容(Six et al., 1998, 2012; Chenu & Stotzky, 2002).土壤团聚体对有机碳物理保护过程已进行了较多研究(Six et al., 2000, 2004; Lugato et al., 2010), 但对于各粒级团聚体内有机碳的碳固存机制尚无定论.有****认为, 较大粒级团聚体内的有机碳大部分为半腐解态植物残体或松散结合态有机碳和多糖类物质(Beare et al., 1994), 而微团聚体内的有机碳主要来源于微生物代谢产物等较难分解的、腐殖化程度较高的有机物(Chaney & Swift, 1986).外源物质进入土壤后, 需经一系列的生物化学分解转化过程, 才能转变为土壤有机碳, 土壤团聚体为这一系列过程提供了合适的“场所”, 进而引起有机碳组分在不同粒径团聚体中的“分馏”, 即有机碳被重新分配.分馏所形成的不同活性和密度组分的有机碳只有在合适的“场所”或者与矿质相结合, 形成稳定性有机碳, 才能被长时间保存下来(Bossuyt et al., 2001; 李凯等, 2010).所以土壤团聚体是土壤固碳的核心.但是, 到目前为止, 关于团聚体的固碳机制还未完全清楚, 团聚体的形成对有机碳的“分馏”特征如何?特别是团聚体内部有机碳密度组分和化学组分分异方面的研究还相对缺乏. ...
Influence of microbial populations and residue quality on aggregate stability 2 2001
... 土壤团聚体是土壤结构的基本单元, 是土壤的重要组成部分, 具有保证和协调土壤水肥气热、影响土壤微生物活性、维持和稳定土壤适宜三相比等作用(李娜等, 2013).近年来, 土壤团聚体的固碳机制一直是全球碳源汇研究的热点.土壤有机碳(SOC)是土壤团聚结构的重要构成物质, 经微生物的分解转化, 被分解成密度、大小和稳定性不同的组分(Six et al., 2012), 这些组分在胶结物质胶结、矿物吸附和电性吸附等作用下形成不同粒级大小的团聚体(Chenu & Stotzky, 2002), 导致不同粒径大小的团聚体中, 有机碳的数量和稳定程度不尽相同.团聚体内有机碳的生物、物理和化学结合方式是有机碳固定及保护机制研究的重要内容(Six et al., 1998, 2012; Chenu & Stotzky, 2002).土壤团聚体对有机碳物理保护过程已进行了较多研究(Six et al., 2000, 2004; Lugato et al., 2010), 但对于各粒级团聚体内有机碳的碳固存机制尚无定论.有****认为, 较大粒级团聚体内的有机碳大部分为半腐解态植物残体或松散结合态有机碳和多糖类物质(Beare et al., 1994), 而微团聚体内的有机碳主要来源于微生物代谢产物等较难分解的、腐殖化程度较高的有机物(Chaney & Swift, 1986).外源物质进入土壤后, 需经一系列的生物化学分解转化过程, 才能转变为土壤有机碳, 土壤团聚体为这一系列过程提供了合适的“场所”, 进而引起有机碳组分在不同粒径团聚体中的“分馏”, 即有机碳被重新分配.分馏所形成的不同活性和密度组分的有机碳只有在合适的“场所”或者与矿质相结合, 形成稳定性有机碳, 才能被长时间保存下来(Bossuyt et al., 2001; 李凯等, 2010).所以土壤团聚体是土壤固碳的核心.但是, 到目前为止, 关于团聚体的固碳机制还未完全清楚, 团聚体的形成对有机碳的“分馏”特征如何?特别是团聚体内部有机碳密度组分和化学组分分异方面的研究还相对缺乏. ...
Change of organic carbon content and its fractions in black soil under long-term application of chemical fertilizers and recycled organic manure 1 2006
Transformation of organic matter from maize residues into labile and humic fractions of three European soils as revealed by 13C distribution and CPMAS-NMR Spectra 1 2000
Soil aggregate stability and aggregate-associated carbon and nitrogen in natural restoration grassland and Chinese red pine plantation on the Loess Plateau 2 2017