Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (Camellia sinensis L.) Planting in Southern Guangxi, China

Revealing the variation in soil aggregate-associated organic carbon (Corg) in tea plantations of various planting ages is crucial to shed more light on the accumulation and decomposition of soil Corg in the tea-planting period. This study measured the co...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Chao Zhang, Xinxin He, Shaoming Ye, Shengqiang Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	soil aggregate tea plantation chronosequence organic C Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/81848b545b0d47a282833c8b2391bd20
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:81848b545b0d47a282833c8b2391bd20
record_format	dspace
spelling	oai:doaj.org-article:81848b545b0d47a282833c8b2391bd202021-11-25T17:38:19ZSoil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China10.3390/f121115301999-4907https://doaj.org/article/81848b545b0d47a282833c8b2391bd202021-11-01T00:00:00Zhttps://www.mdpi.com/1999-4907/12/11/1530https://doaj.org/toc/1999-4907Revealing the variation in soil aggregate-associated organic carbon (C<sub>org</sub>) in tea plantations of various planting ages is crucial to shed more light on the accumulation and decomposition of soil C<sub>org</sub> in the tea-planting period. This study measured the concentrations of soil C<sub>org</sub>, active carbon (C<sub>act</sub>), and recalcitrant carbon (C<sub>rec</sub>) in different-sized aggregates obtained from tea plantations of various planting ages (8, 17, 25, and 43 years old) at the soil depths of 0–20 and 20–40 cm in southern Guangxi, China. According to the wet-sieving approach, soil aggregates were classified as macro- (>0.25 mm) and micro- (<0.25 mm) aggregates, and the former were further divided into coarse (>2 mm), medium (2–1 mm), and fine (1–0.25 mm) fractions. Based on the mean weight diameter (MWD), the stability of soil aggregates was the highest in the 17-year-old tea plantations, and it was closely related to the concentration of soil C<sub>act</sub> (0–20 cm: R<sup>2</sup> = 0.9744, <i>p</i> < 0.05; 20–40 cm: R<sup>2</sup> = 0.8951, <i>p</i> < 0.05), but not C<sub>org</sub> (0–20 cm: R<sup>2</sup> = 0.1532, <i>p</i> > 0.05; 20–40 cm: R<sup>2</sup> = 0.4538, <i>p</i> > 0.05), during the tea-planting process. In the 0–20 and 20–40 cm soil layers, the coarse and medium macro-aggregates had higher concentrations of C<sub>org</sub>, C<sub>act</sub>, and C<sub>rec</sub>, regardless of the tea-planting age; meanwhile, the soil C<sub>act</sub>/C<sub>rec</sub> ratio, indicating the C<sub>org</sub> availability, increased as aggregate size increased, implying that the soil C<sub>org</sub> was younger and more labile in coarse macro-aggregates relative to finer aggregates. Moreover, the tea-planting age significantly affected the C<sub>org</sub>, C<sub>act</sub>, and C<sub>rec</sub> reserves in both soil layers. To be specific, continuous tea planting facilitated the accumulation of soil C<sub>org</sub> and C<sub>rec</sub>, but their reserves’ increase rates decreased over time; meanwhile, the soil C<sub>act</sub> reserve increased during the early (from 8 to 17 years) tea-planting stage and later decreased. Therefore, during the middle (from 17 to 25 years) and late (from 25 to 43 years) tea-planting stages, maintaining the soil as an C<sub>act</sub> pool plays a vital role in facilitating the formation and stabilization of soil aggregates in southern Guangxi, China.Chao ZhangXinxin HeShaoming YeShengqiang WangMDPI AGarticlesoil aggregatetea plantationchronosequenceorganic CPlant ecologyQK900-989ENForests, Vol 12, Iss 1530, p 1530 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	soil aggregate tea plantation chronosequence organic C Plant ecology QK900-989
spellingShingle	soil aggregate tea plantation chronosequence organic C Plant ecology QK900-989 Chao Zhang Xinxin He Shaoming Ye Shengqiang Wang Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
description	Revealing the variation in soil aggregate-associated organic carbon (C<sub>org</sub>) in tea plantations of various planting ages is crucial to shed more light on the accumulation and decomposition of soil C<sub>org</sub> in the tea-planting period. This study measured the concentrations of soil C<sub>org</sub>, active carbon (C<sub>act</sub>), and recalcitrant carbon (C<sub>rec</sub>) in different-sized aggregates obtained from tea plantations of various planting ages (8, 17, 25, and 43 years old) at the soil depths of 0–20 and 20–40 cm in southern Guangxi, China. According to the wet-sieving approach, soil aggregates were classified as macro- (>0.25 mm) and micro- (<0.25 mm) aggregates, and the former were further divided into coarse (>2 mm), medium (2–1 mm), and fine (1–0.25 mm) fractions. Based on the mean weight diameter (MWD), the stability of soil aggregates was the highest in the 17-year-old tea plantations, and it was closely related to the concentration of soil C<sub>act</sub> (0–20 cm: R<sup>2</sup> = 0.9744, <i>p</i> < 0.05; 20–40 cm: R<sup>2</sup> = 0.8951, <i>p</i> < 0.05), but not C<sub>org</sub> (0–20 cm: R<sup>2</sup> = 0.1532, <i>p</i> > 0.05; 20–40 cm: R<sup>2</sup> = 0.4538, <i>p</i> > 0.05), during the tea-planting process. In the 0–20 and 20–40 cm soil layers, the coarse and medium macro-aggregates had higher concentrations of C<sub>org</sub>, C<sub>act</sub>, and C<sub>rec</sub>, regardless of the tea-planting age; meanwhile, the soil C<sub>act</sub>/C<sub>rec</sub> ratio, indicating the C<sub>org</sub> availability, increased as aggregate size increased, implying that the soil C<sub>org</sub> was younger and more labile in coarse macro-aggregates relative to finer aggregates. Moreover, the tea-planting age significantly affected the C<sub>org</sub>, C<sub>act</sub>, and C<sub>rec</sub> reserves in both soil layers. To be specific, continuous tea planting facilitated the accumulation of soil C<sub>org</sub> and C<sub>rec</sub>, but their reserves’ increase rates decreased over time; meanwhile, the soil C<sub>act</sub> reserve increased during the early (from 8 to 17 years) tea-planting stage and later decreased. Therefore, during the middle (from 17 to 25 years) and late (from 25 to 43 years) tea-planting stages, maintaining the soil as an C<sub>act</sub> pool plays a vital role in facilitating the formation and stabilization of soil aggregates in southern Guangxi, China.
format	article
author	Chao Zhang Xinxin He Shaoming Ye Shengqiang Wang
author_facet	Chao Zhang Xinxin He Shaoming Ye Shengqiang Wang
author_sort	Chao Zhang
title	Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
title_short	Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
title_full	Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
title_fullStr	Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
title_full_unstemmed	Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China
title_sort	soil aggregate-associated carbon fraction dynamics during the process of tea (<i>camellia sinensis</i> l.) planting in southern guangxi, china
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/81848b545b0d47a282833c8b2391bd20
work_keys_str_mv	AT chaozhang soilaggregateassociatedcarbonfractiondynamicsduringtheprocessofteaicamelliasinensisilplantinginsouthernguangxichina AT xinxinhe soilaggregateassociatedcarbonfractiondynamicsduringtheprocessofteaicamelliasinensisilplantinginsouthernguangxichina AT shaomingye soilaggregateassociatedcarbonfractiondynamicsduringtheprocessofteaicamelliasinensisilplantinginsouthernguangxichina AT shengqiangwang soilaggregateassociatedcarbonfractiondynamicsduringtheprocessofteaicamelliasinensisilplantinginsouthernguangxichina
_version_	1718412174755364864

Soil Aggregate-Associated Carbon Fraction Dynamics during the Process of Tea (<i>Camellia sinensis</i> L.) Planting in Southern Guangxi, China

Ejemplares similares