Effects of Litter Input on Organic Carbon and Its Chemical-Bound Forms of Soil Microaggregate in Schima Superba Forest

Zhu Liqin; Huang Rongzhen; WangJinping; Huang Guomin; Wan Hongyu; Lin Lijing

doi:10.13961/j.cnki.stbctb.20230220.006

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Effects of Litter Input on Organic Carbon and Its Chemical-Bound Forms of Soil Microaggregate in Schima Superba Forest

- Effects of Litter Input on Organic Carbon and Its Chemical-Bound Forms of Soil Microaggregate in Schima Superba Forest
- Bulletin of Soiland Water Conservation Vol. 43, Issue 1, Pages: 307-313(2023)
- 作者机构：
  
  1. 南昌工程学院, 江西省退化生态系统修复与流域生态水文重点实验室,江西,南昌,330099
  2. 汕头华侨经济文化合作试验区管委会,广东,汕头,515000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.20230220.006
  CLC： S714.2
- Published：2023
- 稿件说明：
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Zhu Liqin, Huang Rongzhen, WangJinping, et al. Effects of Litter Input on Organic Carbon and Its Chemical-Bound Forms of Soil Microaggregate in Schima Superba Forest[J]. Bulletin of Soiland Water Conservation, 2023, 43(1): 307-313.
DOI：

Zhu Liqin, Huang Rongzhen, WangJinping, et al. Effects of Litter Input on Organic Carbon and Its Chemical-Bound Forms of Soil Microaggregate in Schima Superba Forest[J]. Bulletin of Soiland Water Conservation, 2023, 43(1): 307-313. DOI： 10.13961/j.cnki.stbctb.20230220.006.

摘要

[目的] 探究地上凋落物、地下根系和菌根输入对红壤恢复林地土壤微团聚体的影响，为退化地进行森林恢复后土壤功能重建和生态系统碳循环提供依据。[方法] 以亚热带红壤侵蚀退化地恢复形成的典型阔叶林分木荷纯林为研究对象，设置无凋落物(CT)、菌根(M)、根系+菌根(RM)、地上+地下凋落物(LRM)和地上凋落物加倍(DLRM) 5种输入处理，对土壤微团聚体组成、有机碳及其化学结合形态进行分析。[结果] 木荷恢复林土壤微团聚体质量百分比、有机碳、钙键结合态有机碳(Ca-SOC)、铁铝键结合态有机碳〔Fe(Al)-SOC〕和Ca-SOC/SOC在不同处理间均无显著差异(p＞0.05)；相对于CT，LRM处理使20～50 μm和50～200 μm粒级微团聚体Fe(Al)-SOC/SOC分别降低了40.06%和46.67%(p＜0.05)。土壤微团聚体质量百分比、有机碳、Ca-SOC和Fe(Al)-SOC均随粒级的增大而减小，有机碳及结合态有机碳趋于在较小粒级的微团聚体颗粒组(＜20 μm)中富集。微团聚体Ca-SOC含量(0.55～1.28 g/kg)远低于Fe(Al)-SOC含量(6.88～13.34 g/kg)，但其在不同粒级中的变化幅度大于Fe(Al)-SOC；Ca-SOC/SOC(1.54%～3.44%)亦小于Fe(Al)-SOC/SOC(16.75%～42.54%)。微团聚体质量百分比、有机碳、Ca-SOC和Fe(Al)-SOC两两之间呈极显著正相关关系(r=0.497～0.757，p＜0.01)。[结论] 木荷恢复林土壤微团聚体及其有机碳受粒级的影响，对地上凋落物、地下根系和菌根的短期输入有所响应，但未达到显著水平，需要在更长的时间尺度上开展研究。

Abstract

[Objective] The effects of changes in aboveground litter

underground roots

and mycorrhizal inputs on soil microaggregates of restored red soil forestland were analyzed in order to provide a basis for soil function reconstruction and understanding the ecosystem carbon cycle after forest restoration of degraded lands. [Methods] The study was conducted in a pure Schima superba forest

a typical broad-leaved forest recovered from eroded and degraded red soil in a subtropical region. Five input treatments were established: no litter (CT)

mycorrhiza (M)

root+mycorrhiza (RM)

aboveground+underground litter (LRM)

and double aboveground+underground litter (DLRM). The composition of soil microaggregates

organic carbon

and their chemically bound forms were analyzed. [Results] There were no significant differences in soil microaggregate mass percentage

organic carbon

Ca-SOC

Fe (Al)-SOC

and Ca-SOC/SOC among the different treatments (p＞0.05). Compared with CT

LRM reduced Fe (Al)-SOC/SOC of microaggregates of size 20—50 μm and 50—200 μm by 40.06% and 46.67%

respectively (p＜0.05). Soil microaggregate mass percentage

organic carbon

Ca-SOC

and Fe (Al)-SOC decreased as particle size increased

and organic carbon and bound organic carbon tended to be enriched in smaller particle size groups (＜20 μm). The content of Ca-SOC in microaggregates (0.55—1.28 g/kg) was much lower than observed for Fe (Al)-SOC (6.88—13.34 g/kg)

but its variation range in different particle sizes was greater than that of Fe (Al)-SOC. The percentage of Ca-SOC/SOC (1.54%—3.44%) was also less than the percentage of Fe (Al)-SOC/SOC (16.75%—42.54%). Microaggregate mass percentage

organic carbon

Ca-SOC

and Fe (Al)-SOC were positively correlated (r=0.497—0.757

p＜0.01). [Conclusion] Soil microaggregates and their organic carbon in a restored S. superba forest were affected by particle size. Both quantities responded to short-term inputs of aboveground litter

underground roots

and mycorrhiza

but did not reach a significant level

and therefore need to be studied over a longer time period.

关键词

Keywords

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