江汉平原典型农业灌排单元土壤有机碳密度分布特征

周黎; 冯伟; 易军; 刘目兴; 刘秀芸; 陈露; 庄道珩; 张海林

doi:10.13870/j.cnki.stbcxb.2021.06.029

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江汉平原典型农业灌排单元土壤有机碳密度分布特征

更新时间：2025-03-12

- 江汉平原典型农业灌排单元土壤有机碳密度分布特征
- Distribution Characteristics of Soil Organic Carbon Density Under a Typical Agricultural Irrigation-Drainage Unit in Jianghan Plain
- 水土保持学报 2021年35卷第6期页码：213-221
- 作者机构：
  
  1. 地理过程分析与模拟湖北省重点实验室,武汉,430079
  2. 华中师范大学出版社,武汉,430079
  3. 华中师范大学可持续发展研究中心,武汉,430079
- 作者简介：
  
  [ "周黎(1996-),女,安徽合肥人,硕士研究生,主要从事土壤水文研究。E-mail:15375517096@163.com" ]
- 基金信息：
  
  国家自然科学基金项目（41601215，41771261）湖北省自然科学基金项目（2016CFA026，2019CFB766）华中师范大学中央高校基本科研业务费项目（CCNU20QN030，CCNU20TD008）
- DOI：10.13870/j.cnki.stbcxb.2021.06.029
  中图分类号： S153.6
- 纸质出版：2021
- 稿件说明：
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周黎, 冯伟, 易军, 等. 江汉平原典型农业灌排单元土壤有机碳密度分布特征[J]. 水土保持学报, 2021,35(6):213-221.

ZHOU Li, FENG Wei, YI Jun, et al. Distribution Characteristics of Soil Organic Carbon Density Under a Typical Agricultural Irrigation-Drainage Unit in Jianghan Plain[J]. 2021, 35(6): 213-221.
周黎, 冯伟, 易军, 等. 江汉平原典型农业灌排单元土壤有机碳密度分布特征[J]. 水土保持学报, 2021,35(6):213-221. DOI： 10.13870/j.cnki.stbcxb.2021.06.029.

ZHOU Li, FENG Wei, YI Jun, et al. Distribution Characteristics of Soil Organic Carbon Density Under a Typical Agricultural Irrigation-Drainage Unit in Jianghan Plain[J]. 2021, 35(6): 213-221. DOI： 10.13870/j.cnki.stbcxb.2021.06.029.

摘要

农田土壤有机碳库是陆地生态系统最重要的土壤碳库之一，明晰农田土壤有机碳的空间分布特征与影响机制，可为农田土壤肥力及固碳能力评价提供采样依据和理论基础。以江汉平原典型农业灌排单元（面积45 hm2）为研究对象，测定了104个样点0—200 cm深度范围内1 560个土壤样品的有机碳含量，并计算碳密度，揭示土壤有机碳密度的空间分布特征，并分析耕作方式和耕作历史对其分布的影响。结果表明：（1）0—200 cm农田土壤剖面内，20，200 cm厚度土层有机碳密度的均值变化范围分别为1.75~3.77，11.67~34.24 kg/m2，随着土层深度的增加，农田土壤有机碳密度先急剧降低后缓慢增加，且100—200 cm土层的有机碳密度约占整个土壤剖面的45.26%，深层有机碳储量需引起重视；（2）在灌排单元尺度上，0—20 cm土层和0—200 cm剖面有机碳密度均具有较强空间自相关性，表明成土母质和地形等结构性因素是影响灌排单元尺度土壤有机碳空间空间分布特征的主导因子；（3）耕作方式和耕作历史影响农田土壤的有机碳密度，稻田所有土层的有机碳密度均高于旱地，0—200 cm剖面的有机碳密度是旱地的1.31倍；老稻田所有土层的有机碳密度均高于新稻田；林地改稻田和旱地改稻田样地在0—200 cm剖面有机碳总密度差异较小，但林地浅层土体的碳密度更大；合理的增加稻田面积是快速提高农田碳储量的有效途径之一；（4）灌排单元尺度农田土壤有机碳密度的代表性稳定深度为180—200 cm，在进行土壤有机碳密度调查时应尽量延伸采样深度。研究结果为提高农田土壤有机碳密度估算的准确性与采样设计的合理性，以及农田土壤的固碳能力评价提供了科学依据。

Abstract

Farmland soil organic carbon pool is one of the most important soil carbon pools in terrestrial ecosystem. Clarifying the spatial distribution characteristics and influence mechanism of farmland soil organic carbon can provide sampling and theoretical basis for the evaluation of soil fertility and carbon sequestration capacity. Taking a typical agricultural irrigation and drainage unit (area: 45 hm2) in the Jianghan plain as the research object

the soil organic carbon contents (SOC) of 1 560 soil samples in 104 sites with the depth of 0—200 cm were measured

and the soil carbon density (SOCD) was calculated. We revealed the spatial characteristics and the distribution patterns of soil organic carbon density

and analyzed the influence of cultivation mode and history on its distribution. The results showed that: (1) In the 0—200 cm soil profile

the mean variation of SOCD in the 20 cm and 200 cm soil layer was 1.75~3.77 kg/m2 and 11.67~34.24 kg/m2

and the SOCD decreased sharply at first and then increased slowly as the increase of soil depth. The SOCD in 100—200 cm soil layer accounted for about 45.26% of the whole soil profile. Therefore

we should pay more attention to the deep-layer SOCD. (2) The SOCD in 0—20 cm and 0—200 cm soil layer under an Irrigation-Drainage Unit had strong spatial autocorrelation

indicating that structural factors such as soil parent material and topography were the dominant factors affecting the spatial distribution of SOCD under an Irrigation-Drainage Unit. (3) The SOCD among different cultivation modes and history were significantly different. It showed that the SOCD of all soil layers in paddy field was higher than that of upland field. The SOCD of was1.31 times that of upland field in the 0—200 cm

and the old paddy field was higher than the new paddy field in all soil layers. However

the difference between the total SCOD of the woodland to paddy field and the SCOD of the dryland to paddy field was relatively small in the 0—200 cm

while the higher SOCD was observed in woodland than dryland. The above shows that increasing the area of paddy field is one of the effective ways to rapidly increase farmland carbon storage. (4) The representative stable depth of SOCD at the scale of irrigation and drainage units was 180—200 cm

and the sampling depth should be extended as deep as possible when we investigated SOCD. These results provide a scientific basis for improving the accuracy of estimation of SOCD and the rationality of sampling design

as well as the evaluation of soil carbon sequestration capacity.

关键词

Keywords

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