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苑亚茹,李娜,邹文秀,尤孟阳,韩晓增,马大龙.典型黑土区不同生态系统下土壤团聚体有机碳的分布特征.生态学报,2018,(17).http://dx.doi.org/10.5846/stxb201710281931  
典型黑土区不同生态系统下土壤团聚体有机碳的分布特征
Distribution characteristics of organic carbon in aggregates of soils under three ecosystems in typical Mollisols of northeast China
投稿时间:2017-10-28  修订日期:2018-04-02
DOI: 10.5846/stxb201710281931
关键词水稳性团聚体  闭蓄态微团聚体  有机碳组分  长期定位试验  黑土
Key Wordswater-stable aggregate  occluded microaggregate  organic carbon fraction  long-term experiment  black soil
基金项目国家自然科学青年基金项目(41601316);国家自然科学基金项目(41771327;41571285);黑龙江省自然科学基金项目(D2015002)
作者单位E-mail
苑亚茹 哈尔滨师范大学地理科学学院
中国科学院东北地理与农业生态研究所 
yryuanhrbnu@163.com 
李娜 中国科学院东北地理与农业生态研究所 nal@iga.ac.cn 
邹文秀 中国科学院东北地理与农业生态研究所  
尤孟阳 中国科学院东北地理与农业生态研究所  
韩晓增 中国科学院东北地理与农业生态研究所 xzhan@iga.ac.cn 
马大龙 哈尔滨师范大学地理科学学院  
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摘要:
本研究基于团聚体分组和闭蓄态微团聚体分离技术,利用典型黑土区27年长期定位试验,研究草地生态系统、农田生态系统和裸地生态系统下土壤团聚体及团聚体内部组分中有机碳的分布,以解析不同生态系统下土壤团聚体和有机碳固持间的关系,揭示黑土有机碳的物理稳定性机制。结果显示,与农田相比,草地土壤有机碳含量显著提高7.6%;裸地土壤有机碳含量显著下降14.1%。草地促进了大团聚体 (>250 μm),尤其>2000 μm团聚体的形成,提高了土壤团聚体的稳定性;裸地则降低了土壤的团聚化程度及稳定性,大团聚体和微团聚体含量下降,粉粘粒含量相应增加。草地大团聚体中有机碳含量显著高于农田,且内部各组分有机碳含量均有显著提高,其中粗颗粒有机质、闭蓄态微团聚体和粉黏粒有机碳含量增幅分别为600%、54%和65%;裸地增加了粉粘粒结合有机碳含量,降低了大团聚体和微团聚体中有机碳含量,且大团聚体和微团聚体内部各组分有机碳含量均有所下降。三种生态系统类型土壤均以总粉粘粒结合有机碳为主,占土壤总有机碳52%~79%,其作为惰性碳库是黑土有机碳的重要组成部分。黑土有机碳的累积或损失主要表现为活性较强的有机碳库—团聚体中颗粒有机质的增加或减少,与农田相比,草地土壤有机碳的累积主要归因于大团聚体中粗颗粒有机质的增加,为总有机碳增量的3倍;裸地土壤有机碳的损失主要归因于微团聚体中总细颗粒有机质的减少,对总有机碳损失的贡献率为60%。
Abstract:
Using fractionation of aggregate and occluded microaggregate techniques, the study was performed to determine organic carbon (C) content in aggregates and subfractions within aggregates under three ecosystems including grassland, farmland and bare land in a long-term (27 yr) trial in typical Mollisols of Northeast China, which aimed to analyze the links between aggregation and aggregate-protected C and thus reveal the physical protection mechanism of organic C stabilization of Mollisols. We found that, compared with farmland, grassland significantly increased soil organic C (SOC) content by 7.6%; in contrast, bare land greatly decreased SOC content by 14.1%. Grassland promoted the formation of macroaggregates (>250 μm), especially the large macroaggregates (>2000 μm), and significantly increased the mean weight diameters (MWD) of aggregates and thus aggregate stability, while bare land decreased the proportion of macroaggregates and microaggregates and accordingly increased the content of silt plus clay particles, which led to a deaggregation effect. Compared with farmland, grassland decreased C content in microaggregates and silt plus clay particles, but improved C content in macroaggregates and all subfractions within macroaggregates and C content in coarse particulate organic matter (cPOM_M), occluded microaggregtes (mM) and silt plus clay (S&C_M) increased by 600%, 54% and 65%, respectively; Bare land increased C content in silt plus clay particles but decreased that in macroaggregates and microaggregates and all subfractions within them. Carbon associated with silt and clay particles as passive C pool represents a major part of the total C stock of Mollisols under three ecosystems, which accounted for 52%-79% of the total SOC. The accumulation or loss of Mollisols in northeast China was mainly due to the intra-aggregate particulate organic matter (iPOM) fraction as relatively active C pool. The increment of organic C in grassland relative to farmland was primarily located in total coarse particulate matter (total cPOM) in macroaggregates, which was three times the total increases in bulk SOC in grassland compared with farmland. The loss of organic C in bare land relative to farmland was primarily located in total fine particulate matter (total fPOM) in microaggregates, which contributed to 60% of the total loss in bulk SOC in bare land relative to farmland.
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