Soil aggregate-related organic carbon and relevant enzyme activities as affected by tea (Camellia sinensis L.) planting age in hilly region of southern Guangxi, China

Our study aimed to provide a scientific basis for an appropriate tillage management of wheat-maize rotation system, which is beneficial to the sustainable development of agriculture in the fluvo-aquic soil areas in China. Four tillage treatments were investigated after maize harvest, including rotary tillage with straw returning (RT), deep ploughing with straw returning (DP), subsoiling with straw returning (SS), and no tillage with straw mulching (NT). We evaluated soil organic carbon (SOC), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), microbial biomass carbon (MBC), and particulate organic carbon (POC) in bulk soil and soil aggregates with five particle sizes (>5 mm, 5–2 mm, 2–1 mm, 1–0.25 mm, and <0.25 mm) under different tillage managements. Results showed that compared with RT treatment, NT treatment not only increased soil aggregate stability, but also enhanced SOC, DOC, and POC contents, especially those in large size macroaggregates. DP treatment also showed positive effects on soil aggregate stability and labile carbon fractions (DOC and POXC). Consequently, we suggest that no tillage or deep ploughing, rather than rotary tillage, could be better tillage management considering carbon storage. Meanwhile, we implied that mass fractal dimension (Dm) and POXC could be effective indicators of soil quality, as affected by tillage managements.

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Soil aggregate–associated mercury (Hg) and organic carbon distribution and microbial community characteristics under typical farmland–use types

Chemosphere ◽

10.1016/j.chemosphere.2021.129987 ◽

2021 ◽

Vol 275 ◽

pp. 129987

Author(s):

Penggang Pei ◽

Tao Sun ◽

Yingming Xu ◽

Yuebing Sun

Keyword(s):

Microbial Community ◽

Organic Carbon ◽

Soil Aggregate ◽

Carbon Distribution ◽

Community Characteristics

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Soil aggregate stability to predict organic carbon outputs from soils

Geoderma ◽

10.1016/j.geoderma.2014.12.013 ◽

2015 ◽

Vol 243-244 ◽

pp. 205-213 ◽

Cited By ~ 56

Author(s):

V. Chaplot ◽

M. Cooper

Keyword(s):

Organic Carbon ◽

Aggregate Stability ◽

Soil Aggregate ◽

Soil Aggregate Stability

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Soil carbon fractions and enzyme activities under different vegetation types on the Loess Plateau of China

10.5194/se-2016-137 ◽

2016 ◽

Cited By ~ 2

Author(s):

Haixin Zhang ◽

Quanchao Zeng ◽

Shaoshan An ◽

Yanghong Dong ◽

Frédéric Darboux

Keyword(s):

Alkaline Phosphatase ◽

Organic Carbon ◽

Loess Plateau ◽

Enzyme Activities ◽

Soil Layer ◽

Shaanxi Province ◽

The Loess Plateau ◽

Sucrase Activity ◽

Carbon Fractions ◽

Carbon Fraction

Abstract. Vegetation restoration was effective way of protecting soil erosion and water conservation on the Loess Plateau. Carbon fractions and enzyme activities were sensitive parameters for assessment of soil remediation through revegetation. Forest, forest steppe and grassland soils were collected at 0–5 cm and 5–20 cm soil layers in Yanhe watershed, Shaanxi Province. Urease, sucrase, alkaline phosphatase, soil organic carbon (SOC), microbial biomass carbon (MBC), easily oxidized organic carbon (EOC) and dissolved organic carbon (DOC) were measured. The results showed that carbon fraction contents and enzyme activities in the same soil layer followed the order that forest was higher than others. Carbon fraction contents and enzyme activities appeared that the 0–5 cm was higher than 5–20 cm soil layer. In addition, correlation analysis showed that urease activity was related to SOC, MBC, EOC and DOC at 0–5 cm layer; it was correlated with SOC, MBC and EOC at 5–20 cm layer. Sucrase activity had significant positive relationship with SOC, MBC and EOC. Alkaline phosphatase activity was related to EOC and DOC at 0–5 cm layer; it was correlated with MBC and EOC at 5–20 cm layer. The CCA reflected the relationship between sucrase activity and SOC. The contributions from the various forms of carbon fractions and enzyme activities as evaluated by the canonical coefficient of CV were on the order of SOC > DOC > MBC > EOC; sucrase > urease > alkaline phosphatase. Vegetation type was an important factor influencing the variation of soil enzyme activities and carbon fractions on the Loess Plateau.

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