农用地水稳性团聚体中球囊素相关土壤蛋白及其与有机碳、氮的关系

Zhao Xu, Wang Cuili, Zhao Jing, Hou Beibei, Li Yanrong, Qiu Xiaoqing, Song Panpan, Wang Junqiang
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引用次数: 1

摘要

大量研究表明,glalin -related soil protein (GRSP)在土壤团聚体形成和土壤碳平衡中起着重要作用。然而,迄今为止,对半干旱区撂荒农耕地GRSP与水稳性团聚体(WSA)之间的关系还缺乏认识。以民勤绿洲不同年代的撂荒农用地为研究对象。探讨了土地撂荒过程中GRSP的变化及其与WSA的关系。研究结果表明:土壤中可提取glomalin-related soil protein (e-GRSP)和总glomalin-related soil protein (t-GRSP)含量均高于传统耕地,且随着撂耕年限的增加而增加。垂直剖面上e-GRSP和t-GRSP含量高于0 ~ 20 cm和40 ~ 60 cm土层。e-GRSP和t-GRSP占土壤总有机碳(TOC)的比例分别为0.62% ~ 2.0%和1.97% ~ 8.1%。e-GRSP和t-GRSP也分别与TOC (P P 2 mm)、有机碳(OC)和氮(N)呈显著的二次相关。此外,e-GRSP和t-GRSP与粘土和粉土含量(<0.053 mm)以及粘土和粉土中OC和N呈显著和极显著负相关。总体而言,土地撂荒提高了GRSP含量。此外,撂荒后的GRSP倾向于促进大量WSA形成和有机质在大团聚体中的富集。粘土和粉土中的有机质积累也受到抑制。这种现象有助于建立合理的团聚体层次,提高土壤团聚体的稳定性。
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Glomalin-Related Soil Protein and Its Relationship with Organic Carbon and Nitrogen in Water-stable Aggregates in Abandoned Agricultural Lands
A large number of studies have shown that glomalin-related soil protein (GRSP) plays an important role in soil aggregate formation and soil carbon balance. However, to date, we lack understanding on the relationship between GRSP and water-stable aggregates (WSA) in abandoned agricultural lands of semi-arid region. We considered abandoned agricultural lands of different ages in Minqin Oasis as the research object. We discussed the changes of GRSP and the relationship between GRSP and WSA during land abandonment. The research results showed the following: the content of extractable glomalin-related soil protein (e-GRSP) and total glomalin-related soil protein (t-GRSP) is higher than that of traditional arable lands, and the content increases as the years of land abandonment increase. e-GRSP and t-GRSP contents are higher than the soil layer of 0–20 and 40–60 cm in terms of vertical section. The proportion ranges of e-GRSP and t-GRSP in soil total organic carbon (TOC) are 0.62%–2.0% and 1.97%–8.1% respectively in the abandoned agricultural lands. e-GRSP and t-GRSP also exhibit significant quadratic correlation with TOC ( P P 2 mm and the organic carbon (OC) and nitrogen (N) existing in such sizes, respectively. In addition, significant and extremely significant negative correlation exist between the e-GRSP and t-GRSP and the clay and silt contents (<0.053 mm) and the OC and N in clay and silt. In general, land abandonment has raised the GRSP content. Moreover, the GRSP after land abandonment tends to promote large WSA formulation and organic matter enrichment in large aggregates. Organic matter accumulation in clay and silt was also inhibited. This phenomenon helps build a reasonable aggregate hierarchy and improve the stability of soil aggregates.
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