引用本文:刘兴华,章海波,李远,代振飞,付传城,骆永明.黄河三角洲滩涂—湿地—旱地土壤团聚体有机质组分变化规律[J].土壤学报,2019,56(2):374-385.
Liu Xinghua,ZHANG Haibo,Li Yuan,Dai Zhenfei,Fu Chuancheng,Luo Yongming.Variation of Organic Matter in Soil Aggregates with the Succession of Tidal Flatland from Barren Land-Saltmarsh-Upland in the Yellow River Delta[J].Acta Pedologica Sinica,2019,56(2):374-385
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 158次   下载 283 本文二维码信息
码上扫一扫!
分享到: 微信 更多
黄河三角洲滩涂—湿地—旱地土壤团聚体有机质组分变化规律
刘兴华,章海波,李远,代振飞,付传城,骆永明
中科烟台海岸带研究所,浙江农林大学,中科烟台海岸带研究所,中科烟台海岸带研究所,中科烟台海岸带研究所,中科院南京土壤所
摘要:
土壤团聚体有机质是具有生物、化学活性的土壤有机质组分,在土壤碳库周转过程中起重要作用。以黄河三角洲滨海土壤为研究对象,分析土壤团聚体有机质组分含量及稳定性碳同位素,探讨研究区由潮滩到内陆依次分布的无植被荒地、盐生植被湿地和旱地土壤团聚体有机质分配特征、碳库稳定性及来源。结果表明:在无植被荒地—湿地—旱地过渡区,土壤有机质含量呈先增加后降低的趋势,且与大团聚体含量呈显著正相关关系。土壤团聚体有机质可以分为大(微)团聚体表面游离颗粒态有机质(fPOM)、大(微)团聚体内部结合的颗粒态有机质(iPOM)和矿物结合态有机质(mSOM)。无植被荒地fPOM、iPOM(250~2 000 μm)和mSOM的有机碳含量较低;随着盐生植被的生长,湿地土壤中此3种颗粒态有机质的有机碳含量明显增加,最高分别达到410.0 g•kg-1、98.8 g•kg-1和18.8 g•kg-1;湿地过渡为旱地后,3种颗粒态有机质的含量逐渐趋于稳定。无植被荒地土壤颗粒态有机质(包含fPOM和iPOM)中有机碳的分配比均低于20%,盐生植被湿地中该组分分配比在41.8%~75.2%,而农业开垦后相同组分分配比均低于54%。不同土壤有机质组分的δ13C值呈fPOM < iPOM < mSOM,且具有盐生植被湿地 < 旱地 < 无植被荒地的趋势。综上,黄河三角洲无植被荒地土壤有机质总量较低,主要是以矿物结合态有机质为主的稳定碳库,且受海源有机碳影响较大;湿地植被的生长增加了有机质总量,但同时增加了活性碳库的相对比例,对环境条件的改变更为敏感;玉米和小麦耕作降低活性碳库的相对比例,增加了土壤库的稳定性。
关键词:  黄河三角洲  滨海土壤  土壤团聚体  颗粒态有机质  碳稳定性  碳源
DOI:10.11766/trxb201802020082
分类号:
基金项目:国家自然科学基金项目(41371313,41230858,41701263)
Variation of Organic Matter in Soil Aggregates with the Succession of Tidal Flatland from Barren Land-Saltmarsh-Upland in the Yellow River Delta
Liu Xinghua,Zhang Haibo,Li Yuan,Dai Zhenfei,Fu Chuancheng and Luo Yongming
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences,Zhejiang A & F University,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences,Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences,Institute of Soil Science, Chinese Academy of Science
Abstract:
【Objective】Organic matter in soil aggregates (POM, particulate organic matter) is a biologically and chemically active fraction of soil organic matter that plays an important role in terrestrial carbon cycling. The objectives of this study were to characterize the fraction of organic matter and to analyze stability and sources of the soil organic carbon pool in this study area. 【Method】 Soil samples were collected from three tracts of land typical of the studied region in land use, that is, barren land, saltmarsh and upland, for analysis of POM and stable organic carbon isotopes. 【Result】Results show that the content of soil organic carbon presented a curve of first rising from barren land to saltmarsh and then declining from saltmarsh to upland, and was found in a significant positive relationship with the content of soil macroaggregates. The organic matter in soil aggregates could be fractionated into free particulate organic matter (fPOM) on the surface of macro- (micro-) aggregates, intra-macro- (micro-) aggregate particulate organic matter (iPOM, 250~2 000 μm) and mineral-associated soil organic matter. Contents of fPOM, iPOM and mSOM (Mineral-associated Soil Organic Matter) were quite low in the barren land, but soil organic carbon content increased significantly in the three types of SOM in the saltmarsh where some halophytes began to grow, reaching as high as 410.0 g•kg-1, 98.8 g•kg-1 and 18.8 g•kg-1 respectively. When saltmarsh was reclaimed into upland, the rising trend of the three types of POMs leveled off. The POM (including fPOM and iPOM) accounted for only 20% or below of the organic carbon in the barren land, for 41.8%~75.2% in the saltmarsh that had some halophytes growing, and for 54% in the upland. In terms of δ13C, the three types of POM exhibited an order of fPOM < iPOM < mSOM, and the three tracts of lands did an order of saltmarsh < upland < barren land. 【Conclusion】 All the findings in this study demonstrate that although the content of total soil organic carbon is relatively lower in the barren land in the Yellow River Delta, it has a relatively stable carbon pool consisting mainly of mineral-associated organic matter, which is highly affected by marine originated organic carbon. The growth of halophytes in the saltmarsh (wetland) increases the content of total organic matter in the soil and its relative proportion in the active carbon pool, too. Soil organic carbon pool is very sensitive to changes in environment. Cultivation of corn and wheat lowers the relative proportion of active carbon pool, but enhances stability of the so carbon pool.
Key words:  Yellow River Delta  Coastal soils  Soil aggregate  Particulate organic matter  Carbon stability  Carbon source