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首页> 中文期刊> 《农业科学学报（英文版）》 >Soil aggregation and aggregate associated organic carbon and total nitrogen under long-term contrasting soil management regimes in loess soil

Soil aggregation and aggregate associated organic carbon and total nitrogen under long-term contrasting soil management regimes in loess soil

         
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摘要

This study investigated the effects of three contrasting soil management regimes and different nutrient treatments on the distribution of water-stable aggregates (>2, 1–2, 0.5–1, 0.25–0.5, and <0.25 mm) and associated soil organic carbon (SOC) and total nitrogen (TN) content in loess soil. A 21-yr long-term experiment was performed, in which soil management re-gimes include cropland abandonment (Abandonment), bare falow (Falow) and wheat-falow cropping (Cropping). Under Cropping, the folowing nutrient treatments were employed: control (CK, no nutrient input), nitrogen only (N), nitrogen and potassium (NK), phosphorus and potassium (PK), NP, NPK, and manure (M) plus NPK (MNPK). Results demonstrated that Abandonment signiifcantly increased the content of soil macro-aggregates (>0.25 mm) and mean weight diameter (MWD) at 0–10 and 10–20 cm soil horizons compared with Cropping, whereas Falow yielded lower values of above two parameters. Abandonment increased SOC and TN contents in al aggregate sizes by 17–62%and 6–60%, respectively, at 0–10 cm soil layer compared with Cropping. Conversely, Falow decreased SOC and TN contents in al aggregates by 7–27% and 7–25%, respectively. Nevertheless, the three soil management regimes presented similar SOC contents in al aggregates at 10–20 cm soil horizon. Only Cropping showed higher TN content in >0.5 mm aggregates than the two other regimes. Consequently, Abandonment enhanced the partitioning proportions of SOC and TN in >1 mm macro-aggregates, and Falow promoted these proportions in micro-aggregates compared with Cropping. Under Cropping, long-term fertilization did not affect the distribution of aggregates and MWD values compared with those under CK, except for NPK treatment. Fertilizer treatments enhanced SOC and TN contents in aggregates at al tested soil depths. However, fertilization did not affect the partitioning proportions of SOC and TN contents in al aggregates compared with CK. Comprehensive results showed that different soil management regimes generated varied patterns of SOC and TN sequestration in loess soil. Abandonment enhanced soil aggregation and sequestered high amounts of SOC and TN in macro-aggregates. Long-term amendment of organic manure integrated with NPK maintained soil aggregate stability and improved SOC and TN sequestration in al aggregates in loess soil subjected to dryland farming.

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  • 来源
    《农业科学学报（英文版）》 |2015年第12期|2405-2417|共13页
  • 作者

    XIE Jun-yu; XU Ming-gang; Qiangjiu Ciren; YANG Yang; ZHANG Shu-lan; SUN Ben-hua; YANG Xue-yun;

  • 作者单位

    Colege of Resources and Environment, Northwest A&F University, Yangling 712100, P.R.China;

    National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

    Agriculture and Animal Husbandry in Cona County, Shannan 856700, P.R.China;

    Department of Agronomy, Hetao Colege, Bayannur 015000, P.R.China;

    Colege of Resources and Environment, Northwest A&F University, Yangling 712100, P.R.China;

    Colege of Resources and Environment, Northwest A&F University, Yangling 712100, P.R.China;

    Colege of Resources and Environment, Northwest A&F University, Yangling 712100, P.R.China;

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