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Soil Aggregate Stability and Aggregate‐Associated Organic Carbon under different Land Use/Land Cover Types
Soil Use and Management ( IF 3.8 ) Pub Date : 2020-04-01 , DOI: 10.1111/sum.12549
Tshering Dorji 1 , Damien J. Field 2 , Inakwu O. A. Odeh 2
Affiliation  

Soil aggregate stability (SAS) is an indicator for soil condition and is greatly influenced by land use or land cover (LULC) type and other soil and environmental attributes. This study investigated the soil aggregate‐size distribution, SAS, aggregate‐associated organic carbon (AAOC) and the relative importance of factors affecting SAS and AAOC. Based on conditioned Latin hypercube sampling, soil aggregate samples were collected from the “A” horizon and wet sieved into large macroaggregates (>2.0 mm), small macroaggregates (0.25–2.0 mm), microaggregates (0.053–0.25 mm) and mineral fraction ( shrubland > natural grassland > orchard > blue pine > broadleaf > mixed conifer > dry land > paddy land. The AAOC of the large macroaggregates constituted for 76%–90% of the total AAOC under all LULC types except under dry land (65%) and paddy land (38%). While SAS was largely influenced by the AAOC of small macroaggregates, microaggregates and large macroaggregates and LULC type, the AAOC of different aggregate fractions was mostly affected by LULC type, altitude and slope. SAS did not exhibit any significant relationship with the AAOC of different aggregate fractions under the natural LULC types but showed a strong relationship under the agricultural land indicating that AAOC is more critical for SAS under the agricultural land than under the natural LULC.

中文翻译:

不同土地利用/土地覆盖类型下土壤团聚体稳定性和团聚体相关有机碳

土壤团聚体稳定性 (SAS) 是土壤状况的指标,受土地利用或土地覆盖 (LULC) 类型以及其他土壤和环境属性的影响很大。本研究调查了土壤团聚体粒径分布、SAS、团聚体相关有机碳 (AAOC) 以及影响 SAS 和 AAOC 的因素的相对重要性。基于条件拉丁超立方体采样,从“A”层收集土壤团聚体样品并湿筛成大团聚体(>2.0 mm)、小团聚体(0.25-2.0 mm)、微团聚体(0.053-0.25 mm)和矿物部分(灌木地>天然草地>果园>青松>阔叶>混针叶>旱地>水田。除旱地(65%)和水田(38%)外,所有 LULC 类型下大型团聚体的 AAOC 占总 AAOC 的 76%–90%。SAS 主要受小团聚体、微团聚体和大团聚体的 AAOC 和 LULC 类型的影响,而不同团聚体的 AAOC 主要受 LULC 类型、海拔和坡度的影响。SAS 与自然 LULC 类型下不同骨料比例的 AAOC 没有任何显着关系,但在农地下显示出很强的关系,这表明 AAOC 对农地下的 SAS 比自然 LULC 下更重要。不同骨料组分的AAOC主要受LULC类型、海拔高度和坡度的影响。SAS 与自然 LULC 类型下不同骨料比例的 AAOC 没有任何显着关系,但在农地下显示出很强的关系,这表明 AAOC 对农地下的 SAS 比自然 LULC 下更重要。不同骨料组分的AAOC主要受LULC类型、海拔高度和坡度的影响。SAS 与自然 LULC 类型下不同骨料比例的 AAOC 没有任何显着关系,但在农地下显示出很强的关系,这表明 AAOC 对农地下的 SAS 比自然 LULC 下更重要。
更新日期:2020-04-01
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