草业学报 ›› 2022, Vol. 31 ›› Issue (1): 47-56.DOI: 10.11686/cyxb2020477
荆佳强1,2(), 萨仁其力莫格null2, 秦洁2, 张海芳2, 李明2, 杨殿林2()
收稿日期:
2020-10-20
修回日期:
2020-12-28
出版日期:
2021-12-01
发布日期:
2021-12-01
通讯作者:
杨殿林
作者简介:
Corresponding author. E-mail: yangdianlin@caas.cn基金资助:
Jia-qiang JING1,2(), Ren-qi-li-mo-ge SA2, Jie QIN2, Hai-fang ZHANG2, Ming LI2, Dian-lin YANG2()
Received:
2020-10-20
Revised:
2020-12-28
Online:
2021-12-01
Published:
2021-12-01
Contact:
Dian-lin YANG
摘要:
土壤活性有机碳能够准确反映土壤有效性,表征土壤质量变化,是探索可持续草地管理措施的关键指标之一。以内蒙古贝加尔针茅草原为研究对象,采用围封、放牧和刈割野外控制试验,探讨不同利用方式对土壤有机碳(SOC)和活性有机碳的影响,发现不同利用方式下土壤SOC含量表现为围封>刈割>放牧,其中围封区和刈割区土壤SOC含量显著大于放牧区,围封区与刈割区土壤SOC含量差异不显著,在土壤活性有机碳中土壤可溶性有机碳(DOC)含量表现为放牧>围封>刈割。土壤微生物量碳(MBC)和土壤易氧化有机碳(ROC)含量均表现为围封>刈割>放牧,围封区与刈割区土壤MBC和土壤ROC平均含量差异不显著,且均显著大于放牧区。土壤MBC、ROC和SOC之间呈极显著相关性(P<0.01)。土壤ROC和土壤MBC与土壤全氮和土壤全磷呈极显著相关性(P<0.01)。围封与刈割有利于土壤SOC、MBC、ROC的提升,放牧对土壤DOC有一定累积作用。围封和刈割增强了土壤SOC的稳定性,活性有机碳与土壤有机碳和土壤理化性质密切相关,能够敏感地反映土壤有机碳的变化。
荆佳强, 萨仁其力莫格null, 秦洁, 张海芳, 李明, 杨殿林. 不同利用方式对贝加尔针茅草原土壤活性有机碳的影响[J]. 草业学报, 2022, 31(1): 47-56.
Jia-qiang JING, Ren-qi-li-mo-ge SA, Jie QIN, Hai-fang ZHANG, Ming LI, Dian-lin YANG. Effects of different land-use patterns on soil active organic carbon in Stipa baicalensis steppe in Inner Mongolia[J]. Acta Prataculturae Sinica, 2022, 31(1): 47-56.
利用方式 Land use patterns | pH | 土壤有机碳 Soil organic carbon (SOC, g·kg-1) | 全氮 Total nitrogen (TN, g·kg-1) | 全磷 Total phosphorus (TP, g·kg-1) | 铵态氮 NH4+-N (mg·kg-1) | 硝态氮 NO3--N (mg·kg-1) |
---|---|---|---|---|---|---|
围封Enclosure | 6.72±0.05b | 13.54±0.03a | 2.46±0.10a | 0.41±0.00a | 4.52±0.05b | 1.19±0.04b |
放牧Grazing | 6.74±0.03b | 13.01±0.07b | 2.46±0.10a | 0.42±0.00a | 5.15±0.23a | 1.56±0.04a |
刈割Mowing | 7.26±0.11a | 13.30±0.11a | 2.61±0.03a | 0.41±0.01a | 4.74±0.05ab | 1.23±0.04b |
表1 不同利用方式下贝加尔针茅草原土壤理化因子
Table 1 Soil organic carbon content and basic physical and chemical properties of S. baicalensis steppe under different land use patterns
利用方式 Land use patterns | pH | 土壤有机碳 Soil organic carbon (SOC, g·kg-1) | 全氮 Total nitrogen (TN, g·kg-1) | 全磷 Total phosphorus (TP, g·kg-1) | 铵态氮 NH4+-N (mg·kg-1) | 硝态氮 NO3--N (mg·kg-1) |
---|---|---|---|---|---|---|
围封Enclosure | 6.72±0.05b | 13.54±0.03a | 2.46±0.10a | 0.41±0.00a | 4.52±0.05b | 1.19±0.04b |
放牧Grazing | 6.74±0.03b | 13.01±0.07b | 2.46±0.10a | 0.42±0.00a | 5.15±0.23a | 1.56±0.04a |
刈割Mowing | 7.26±0.11a | 13.30±0.11a | 2.61±0.03a | 0.41±0.01a | 4.74±0.05ab | 1.23±0.04b |
图1 不同利用方式下贝加尔针茅草原土壤可溶性有机碳含量不同大写字母表示不同利用方式在相同土层0.05水平差异显著,不同小写字母表示相同利用方式不同土层在0.05水平差异显著。下同。Different capital letters indicate that different land use types have significant differences at the 0.05 level in the same soil layer, and different lowercase letters indicate that the same land use types have significant differences at 0.05 level in different soil layers. The same below.
Fig.1 Changes of soil dissolved organic carbon (DOC) content under different land use patterns in S. baicalensis steppe
图2 不同利用方式下贝加尔针茅草原土壤易氧化有机碳含量
Fig.2 Changes of soil readily oxidizable organic carbon (ROC) content under different land use patterns in S. baicalensis steppe
利用方式 Land use patterns | 可溶性有机碳 比例 DOC/SOC | 易氧化有机碳比例 ROC/SOC | 微生物生物量碳比例 MBC/SOC |
---|---|---|---|
围封Enclosure | 0.61±0.01b | 59.15±0.51a | 4.92±0.19a |
放牧Grazing | 0.70±0.01a | 52.75±2.38b | 3.59±0.05b |
刈割Mowing | 0.55±0.05b | 58.93±1.44a | 4.83±0.25a |
表2 不同利用方式下土壤活性有机碳的分配比例
Table 2 Distribution ratio of soil active organic carbon under different utilization methods (%)
利用方式 Land use patterns | 可溶性有机碳 比例 DOC/SOC | 易氧化有机碳比例 ROC/SOC | 微生物生物量碳比例 MBC/SOC |
---|---|---|---|
围封Enclosure | 0.61±0.01b | 59.15±0.51a | 4.92±0.19a |
放牧Grazing | 0.70±0.01a | 52.75±2.38b | 3.59±0.05b |
刈割Mowing | 0.55±0.05b | 58.93±1.44a | 4.83±0.25a |
指标Index | 易氧化有机碳ROC | 微生物生物量碳MBC | 土壤有机碳SOC | pH | 全氮TN | 全磷TP |
---|---|---|---|---|---|---|
可溶性有机碳DOC | -0.20 | -0.32 | -0.25 | -0.30 | -0.24 | -0.08 |
易氧化有机碳ROC | 0.92** | 0.95** | -0.24 | 0.95** | 0.58** | |
微生物生物量碳MBC | 0.90** | -0.08 | 0.89** | 0.51** |
表3 土壤活性有机碳含量与土壤理化指标之间的相关系数
Table 3 Correlation coefficients between soil active organic carbon content and soil physical and chemical indexes
指标Index | 易氧化有机碳ROC | 微生物生物量碳MBC | 土壤有机碳SOC | pH | 全氮TN | 全磷TP |
---|---|---|---|---|---|---|
可溶性有机碳DOC | -0.20 | -0.32 | -0.25 | -0.30 | -0.24 | -0.08 |
易氧化有机碳ROC | 0.92** | 0.95** | -0.24 | 0.95** | 0.58** | |
微生物生物量碳MBC | 0.90** | -0.08 | 0.89** | 0.51** |
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