Effects of Conversion of Degraded Grassland into Plantations on Organic Carbon Turnover of Soil Aggregate in Subtropical Red Soil Area

LI Yanyan; LIU Liangying; ZHANG Zhijian; WU Chunsheng; LIU Yuanqiu; FAN Houbao

doi:10.13870/j.cnki.stbcxb.2019.01.014

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Effects of Conversion of Degraded Grassland into Plantations on Organic Carbon Turnover of Soil Aggregate in Subtropical Red Soil Area

更新时间：2025-03-12

- Effects of Conversion of Degraded Grassland into Plantations on Organic Carbon Turnover of Soil Aggregate in Subtropical Red Soil Area
- Vol. 33, Issue 1, Pages: 80-85(2019)
- 作者机构：
  
  1. 江西农业大学园林与艺术学院,南昌,330045
  2. 南昌工程学院水利与生态工程学院,南昌,330099
  3. 宜春市林业科学研究所,江西,宜春,336000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.01.014
  CLC： S714.1
- Published：2019
- 稿件说明：
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LI Yanyan, LIU Liangying, ZHANG Zhijian, et al. Effects of Conversion of Degraded Grassland into Plantations on Organic Carbon Turnover of Soil Aggregate in Subtropical Red Soil Area[J]. 2019, 33(1): 80-85.
DOI：

LI Yanyan, LIU Liangying, ZHANG Zhijian, et al. Effects of Conversion of Degraded Grassland into Plantations on Organic Carbon Turnover of Soil Aggregate in Subtropical Red Soil Area[J]. 2019, 33(1): 80-85. DOI： 10.13870/j.cnki.stbcxb.2019.01.014.

摘要

选择江西泰和红壤退化区25年的自然恢复草地和2种恢复林地，测定了土壤团聚体有机碳的δ13C，探讨了森林恢复过程有机碳在团聚体中的分配和周转特征。结果表明：3种植被恢复模式土壤大团聚比例最高，微团聚体比例最低，木荷林0-20 cm土层大团聚体比例平均值高于马尾松林和草地；木荷林表层土各粒径团聚体有机碳含量均显著高于草地，表层土粉黏粒（<53 μm）有机碳含量最高，其有机碳δ13C最低；草地表层土团聚体中有机碳δ13C值比全土降低幅度最大，阔叶林中居中；3种植被恢复模式下土壤大团聚体总有机碳储量最大，其次是粉黏粒，最小的是微团聚体，来自人工林的新碳主要分布在土壤表层大团聚体中；马尾松林和木荷林表层土团聚体中有机碳的周转时间为41~53年，低于10-20 cm土层，2种林分粉黏粒中有机碳的周转时间最短，微团聚体中有机碳周转时间最长。研究表明以常绿阔叶树木荷直接进行植被恢复能够有效提升土壤地力，不仅提高了全土中的有机碳含量，也增加了团聚体中的有机碳含量；而以先锋树种马尾松进行的植被恢复效果弱于木荷林，应当采取一定营林措施促进马尾松林的恢复效果。

Abstract

In this study

two stands and natural grassland were selected in Taihe Red soil degraded area of Jiangxi Province to research the distributions and turnover characteristics of organic carbon in soil aggregates. The results showed that the proportion of macroagrregates was the largest and that of microaggregates was the lowest.The content of organic carbon of all aggregates was higher in the Schima plantation than that of the grassland. The organic carbon in soil silt (< 53 μm) was the highest. The δ13C value of soil aggregate in the surface soil had the highest decrease in grassland compared with the original soil

and moderate in broad-leaved forest. The turnover time of soil organic carbonin surface layer in coniferous forest was 41~53 years

lower than that in 10-20 cm soil layer. The turnover time of organic carbon in the clay particle of the two plantation was the shortest and that in the macroaggregate was the longest.The results also showed that vegetation restoration from evergreen broad-leaved Schima superba in the red soil region could effectively enhance soil fertility thus not only increasing the organic carbon content in the original soil

but also increasing the organic carbon content in the aggregate. However

the vegetation restoration effect of Pinu smassoniana plantationwas weaker than that of broad-leaved forest. So some measures should be taken to promote the restoration of coniferous forest.

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