草业学报 ›› 2026, Vol. 35 ›› Issue (8): 14-21.DOI: 10.11686/cyxb2025420
罗欢1(
), 蒋玉奇2, 牛得草2, 郭丁2, 李旭东2(
)
收稿日期:2025-10-18
修回日期:2025-11-12
出版日期:2026-08-20
发布日期:2026-06-22
通讯作者:
李旭东
作者简介:Corresponding author. E-mail: lixudong@lzu.edu.cn基金资助:
Huan LUO1(
), Yu-qi JIANG2, De-cao NIU2, Ding GUO2, Xu-dong LI2(
)
Received:2025-10-18
Revised:2025-11-12
Online:2026-08-20
Published:2026-06-22
Contact:
Xu-dong LI
摘要:
凋落物分解是影响土壤有机碳(SOC)形成的重要过程,而土壤水分条件会对这一过程产生重要影响。研究土壤水分变化对草地凋落物分解及其对土壤有机碳形成的影响,有助于阐明气候变化背景下土壤碳库的动态变化及其稳定机制。本研究以黄土高原温性草原优势物种长芒草为对象,通过将其叶片(SL)和根系(SR)在不同水分条件下[W1:土壤年平均含水量(质量含水量为7.16%);W2:土壤田间持水量的50%(质量含水量为23.55%)]与土壤共同培养3年,分析不同水分条件下凋落物的分解特征以及土壤有机碳和团聚体有机碳的变化。结果表明:与W1相比,W2条件下SL和SR处理的土壤微生物量碳显著增加了25.2%和40.7%,进而显著提高了凋落物的分解速率,同时也显著增加了SOC含量(P<0.05)。另外,土壤水分的增加显著提高了<0.053 mm团聚体的新碳形成效率,SL和SR处理在W2条件下的新碳形成效率较W1分别显著增加6.5%和8.0%(P<0.05)。说明在半干旱区温性草原,土壤水分的增加可促进凋落物的分解,并使凋落物碳分解后更多地向<0.053 mm团聚体中分配,进而促进了矿质结合态有机碳的形成。
罗欢, 蒋玉奇, 牛得草, 郭丁, 李旭东. 土壤水分对黄土高原温性草原凋落物分解及土壤有机碳形成的影响[J]. 草业学报, 2026, 35(8): 14-21.
Huan LUO, Yu-qi JIANG, De-cao NIU, Ding GUO, Xu-dong LI. The impact of soil moisture on litter decomposition and soil organic carbon deposition in the temperate grasslands of the Loess Plateau[J]. Acta Prataculturae Sinica, 2026, 35(8): 14-21.
凋落物 Litter | 培养时间 Co-culture time (a) | 处理 Treatment | 可溶性成分 Soluble components | 半纤维素 Hemicellulose | 纤维素 Cellulose | 木质素 Lignin |
|---|---|---|---|---|---|---|
| 叶片Leave (SL) | 0 | W0 | 0.135±0.001b | 0.163±0.001a | 0.147±0.000a | 0.055±0.000b |
| 3 | W1 | 0.204±0.003a | 0.114±0.010b | 0.036±0.011b | 0.090±0.010a | |
| 3 | W2 | 0.210±0.006a | 0.113±0.009b | 0.026±0.007b | 0.108±0.017a | |
| 根Root (SR) | 0 | W0 | 0.101±0.000b | 0.126±0.001a | 0.165±0.001a | 0.061±0.000b |
| 3 | W1 | 0.148±0.025ab | 0.117±0.016a | 0.069±0.010b | 0.144±0.007a | |
| 3 | W2 | 0.195±0.042a | 0.109±0.006a | 0.050±0.009b | 0.166±0.020a |
表1 不同水分处理下凋落物化学组分的变化
Table 1 Changes in the chemical composition of litter under different moisture treatments (g·kg-1)
凋落物 Litter | 培养时间 Co-culture time (a) | 处理 Treatment | 可溶性成分 Soluble components | 半纤维素 Hemicellulose | 纤维素 Cellulose | 木质素 Lignin |
|---|---|---|---|---|---|---|
| 叶片Leave (SL) | 0 | W0 | 0.135±0.001b | 0.163±0.001a | 0.147±0.000a | 0.055±0.000b |
| 3 | W1 | 0.204±0.003a | 0.114±0.010b | 0.036±0.011b | 0.090±0.010a | |
| 3 | W2 | 0.210±0.006a | 0.113±0.009b | 0.026±0.007b | 0.108±0.017a | |
| 根Root (SR) | 0 | W0 | 0.101±0.000b | 0.126±0.001a | 0.165±0.001a | 0.061±0.000b |
| 3 | W1 | 0.148±0.025ab | 0.117±0.016a | 0.069±0.010b | 0.144±0.007a | |
| 3 | W2 | 0.195±0.042a | 0.109±0.006a | 0.050±0.009b | 0.166±0.020a |
图1 不同水分处理下的凋落物干物质残留率不同大写字母表示不同凋落物处理间差异显著,不同小写字母表示不同水分处理间差异显著(平均值±标准误,P<0.05)。下同。Different capital letters indicate significant differences between different litter treatments, while different lowercase letters indicate significant differences between different moisture treatments [mean±standard error (SE), P<0.05]. The same below.
Fig.1 Dry matter residue rates of litters under different moisture treatments
图4 不同水分处理下各粒径土壤团聚体有机碳含量净变化量不同大写字母表示不同粒径团聚体之间差异显著,不同小写字母表示不同水分处理间差异显著(平均值±标准误,P<0.05)。下同。Different capital letters indicate significant differences among aggregates of different particle sizes, while different lowercase letters indicate significant differences between different moisture treatments [mean±standard error(SE), P<0.05]. The same below.
Fig.4 Net changes in the organic carbon content of soil aggregates with different particle sizes under different moisture treatments
图6 不同水分处理下的土壤微生物量碳含量不同大写字母表示不同凋落物间差异显著,不同小写字母表示不同水分处理间差异显著(平均值±标准误,P<0.05)。 Different capital letters indicate significant differences among different litters, while different lowercase letters indicate significant differences between different moisture treatments(mean±SE, P<0.05).
Fig.6 Soil microbial biomass carbon content under different moisture treatments
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