不同土地利用方式和气候区域下土壤溶解性有机碳差异特征

李亚林; 练金山; 任凤玲

doi:10.12153/j.issn.1674-991X.20240292

不同土地利用方式和气候区域下土壤溶解性有机碳差异特征

doi: 10.12153/j.issn.1674-991X.20240292

1.
生态环境部土壤与农业农村生态环境监管技术中心
2.
北方干旱半干旱耕地高效利用全国重点实验室，中国农业科学院农业资源与农业区划研究所

基金项目: 国家重点研发计划项目( 2023YFC3707703)

详细信息

作者简介:
李亚林（1995—），男，博士研究生，主要从事土壤碳循环研究，henanyalin@163.com

通讯作者:
任凤玲(1992—)，女，博士，主要从事土壤培肥与肥力演变及土壤改良等方面的研究，flren0302@163.com

中图分类号: X53
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出版历程
- 收稿日期: 2024-05-06
- 录用日期: 2024-07-15
- 修回日期: 2024-06-12

Characteristics of dissolved organic carbon under various land use types and climatic regions

1.
Techical Center for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment
2.
State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences

摘要

摘要:
土壤溶解性有机碳（DOC）是土壤有机碳库的重要组成部分，探讨不同土地利用方式下土壤有机碳（SOC）和DOC含量、DOC分配比例（DOC/SOC）及其差异性特征，对于深刻认识SOC周转及其可持续管理具有重要意义。通过搜集、提取2000—2024年我国已发表的涉及农田、林地和草地3种土地利用方式下表层土壤（0~20 cm）DOC含量的相关数据，共获得116篇目标文献，得到549组匹配数据；定量分析不同气候区和土壤类型条件下，不同土地利用方式（农田、林地和草地）对DOC含量影响及其SOC与DOC的相互关系。结果表明：不同土地利用方式下，SOC和DOC含量差异显著，即林地中SOC和DOC含量均高于草地和农田。不同气候区，3种土地利用方式下DOC与SOC之间均呈现极显著的正相关关系（P<0.01），且DOC分配比例各不相同。亚热带季风性气候区，林地土壤中DOC所占比例的均值为2.30%，显著高于农田（0.87%）和草地（0.66%）（P<0.05）；温带季风性气候区，3种土地利用方式下DOC分配比例无显著差异（P>0.05），其中林地（1.27%）>农田（1.18%）>草地（1.03%）；温带大陆性气候区，农田、林地和草地土壤中DOC分配比例分别为1.76%、1.43%和1.28%，但无显著差异（P>0.05）。农田中不同类型土壤的DOC分配比例存在显著差异，其中褐土的DOC分配比例最高，均值为1.61%，其次是灰漠土（1.38%）、黑土（1.10%）、红壤（0.99%）和潮土（0.89%），而水稻土最低（0.74%）。研究结果对于揭示不同土地利用方式下的DOC变化具有重要意义，同时为不同土地利用方式下DOC管理提供参考。
- 土地利用方式 /
- 土壤有机碳 /
- 土壤溶解性有机碳 /
- 土壤类型
Abstract:
The soil dissolved organic carbon (DOC) is an important component of soil organic carbon (SOC) pool. Exploring the variations of SOC, DOC contents and the proportions of DOC to SOC under different land use types is of great significance to deeply understand the turnover and sustainable management of SOC. The DOC content data of surface soil (0-20 cm) under the three land use types, including cropland, forestland and grassland, were collected and extracted from published studies conducted in China from 2000 to 2024. A total of 116 target literature were obtained, yielding 549 matched data sets. A quantitative analysis was conducted to determine the impact of different land use types, climate zones and soil types on DOC content under different climate regions and soil types, as well as the relationship between SOC and DOC. The results showed there was a significant difference in the contents of SOC and DOC under the three land use types. The SOC and DOC contents under forestland were higher than those in grassland and cropland. In different climatic regions, there was a significant positive correlation between DOC and SOC under the three land use types (P<0.01), and the proportion of DOC was different. In subtropical monsoon climate region, the mean value of DOC proportion in forestland soil was 2.30%, which was significantly higher than that in cropland (0.87%) and grassland (0.66%, P<0.05); in temperate monsoon climate region, there was no significant difference in DOC proportion (P>0.05) under the three land use types, including forestland (1.27%) > cropland (1.18%) > grassland (1.03%); in temperate continental climate region, DOC proportion in cropland, forestland and grassland soil was 1.76%,1.43% and 1.28%, respectively, but there was no significant difference (P>0.05). The DOC proportion in different soil types of croplands is significantly different. Among them, the DOC proportion in cinnamon soil was the highest, and the mean value was 1.61%, followed by gray desert soil (1.38%), black soil (1.10%), red soil (0.99%) and fluvo-aquic soil (0.89%), while paddy soil was the lowest (0.74%). The research has important implications for revealing DOC changes and providing important theoretical significance for the management of DOC under different land use practices.
- land use type /
- soil organic carbon /
- soil dissolved organic carbon /
- soil type

HTML全文

图 1 不同气候区农田、林地和草地表层土壤DOC的分配比例

注：n为样本数。不同小写字母表示不同分组间差异显著（P<0.05）。箱体中间实线代表中位数，正方形代表平均值，上下两条误差线分别代表95%和5%的置信区间，上下圆点分别代表最大值和最小值。全文同。

Figure 1. Allocation proportion of DOC in surface soil of cropland, forestland and grassland in different climate regions

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图 2 不同气候区3种土地利用方式下SOC和DOC相互关系

注：阴影部分表示95%置信区间，全文同。

Figure 2. Relationship between SOC and DOC under three land use types in different climatic zones

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图 3 农田中不同土壤类型的DOC分配比例

注：数字后面不同小写字母表示各分组间差异显著（P<0.05）。

Figure 3. Allocation proportion of DOC under different soil types of cropland

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图 4 农田中不同土壤类型的DOC与SOC关系

Figure 4. Relationship between DOC and SOC in different soil types of cropland

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表 1 不同土地利用方式下土壤中SOC和DOC的含量

Table 1. Contents of soil organic carbon (SOC) and dissolved organic carbon (DOC) under different land use types

气候区	土地利用方式	样本数（n）	SOC含量/（g/kg）		DOC含量/（mg/kg）
气候区	土地利用方式	样本数（n）	平均值	范围	平均值	范围
亚热带季风性气候区	农田	179	14.70±0.43β	4.22~30.05	117.86±6.78b	16.85~339.23
	林地	113	17.62±0.63α	4.58~36.33	405.83±30.56a	20.99~1682.08
	草地	26	13.20±1.82β	3.90~52.03	76.37±19.70b	0.14~469.78
温带季风性气候区	农田	116	15.81±0.73β	1.19~36.91	178.14±13.74b	6.38~612.90
	林地	29	19.42±1.95α	5.98~41.45	210.29±20.35a	61.72~481.52
	草地	19	12.05±2.34βγ	2.25~42.41	105.37±18.7b	35.13~318.81
温带大陆性气候区	农田	26	7.88±0.63α	2.46~13.22	136.79±17.78a	16.57~303.10
	林地	21	10.89±1.85α	2.66~34.72	162.82±34.62a	15.28~515.49
	草地	20	9.64±1.28α	2.36~22.40	126.66±23.38a	11.38~372.75
注：同列不同字母α、β、γ和a、b、c分别表示相同气候区不同土地利用方式间SOC和DOC含量在5%水平上差异显著。表中平均值均为平均值±SD。

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表 2 不同土地利用方式下SOC和DOC的关系

Table 2. Correlation between soil dissolved organic carbon(y) and soil organic carbon (x) under different land use types

气候区	土地利用方式	样本数（n）	方程	R²	斜率
亚热带季风性气候区	全部	318	y=17.86x−62.06	0.22^**	17.86
	农田	179	y=5.01x+44.22	0.10^**	5.01 b
	林地	113	y=26.28x−57.21	0.29^**	26.28 a
	草地	26	y=8.34x−33.77	0.58^**	8.34 b
温带季风性气候区	全部	164	y=8.87x+38.04	0.28^**	8.87
	农田	116	y=9.94x+21.04	0.28^**	9.94 a
	林地	29	y=6.37x+86.59	0.35^**	6.37 a
	草地	19	y=6.78x+23.65	0.70^**	6.78 a
温带大陆性气候区	全部	67	y=16.61x−13.37	0.72^**	16.61
	农田	26	y=16.98x+3.02	0.33^**	16.98 a
	林地	21	y=17.49x−27.59	0.87^**	17.49 a
	草地	20	y=16.05x−28.16	0.77^**	16.05 a
注：不同字母分别表示斜率在5%水平上差异显著（P<0.05）；**表示在P<0.01水平上显著相关。方程中，y为DOC含量，x为SOC含量。全文同。

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