ISWC OpenIR  > 水保所知识产出(1956---)
黄土丘陵区水蚀坡面土壤有机碳矿化动态模拟
张亚锋1,2; 许明祥1,3; 陈盖3; 王超华3
2016
Source Publication中国水土保持科学
Volume14Issue:4Pages:9-17
Abstract

为了深入理解侵蚀影响下的碳排放机制,本文以黄土丘陵区不同有机碳背景的水蚀坡面土壤为研究对象,采
用3 因素( 土壤有机碳水平、温度和土壤含水量) 4 水平的正交试验设计,通过对坡面不同部位土壤的室内矿化培
养实验,分析水蚀坡面土壤有机碳矿化特征,并模拟土壤有机碳矿化动态。结果表明: 土壤有机碳质量分数是影响
水蚀坡面有机碳矿化的主要因素,不同有机碳背景下,水蚀坡面表现出不同有机碳矿化特征。当土壤有机碳水平
较低时,坡面侵蚀促进了沉积区土壤有机碳矿化; 当土壤有机碳水平较高时,沉积区土壤有机碳矿化受到抑制。一
级动力学方程较好的描述土壤有机碳矿化累积动态( R > 0. 98) ,有机碳矿化潜力( Cp
值) 能综合反映土壤有机碳水
平、温度和含水量对有机碳矿化的影响。通过Cp
值修正,得到的土壤有机碳矿化多因素方程拟合度较高( R2 >
0. 95) ,能够很好地拟合不同有机碳水平下土壤有机碳矿化动态。

Other Abstract

[Background] In order to understand the mechanism of soil carbon emission under soil
erosion,we chose the study area located in Ansai County of Shaanxi Province. It is a typical loess hilly
and gully region where annual precipitation distribution is not even,precipitation on July-September
accounts for about 60% of annual rainfall,and most are heavy rainstorms. The zonal soil is dark loessial
one that lost completely due to serious soil erosion,thus soil is mainly loessial one ( calcareous ustic
cambisols) developed from parent-soil loess. As one of the most serious water erosion area all over the
world,the selected area is suitable for exploring erosion induced carbon emission. [Methods]Based on
the orthogonal experiment design with three factors ( soil organic carbon ( SOC) level,soil temperature,
and water content) and four levels of the factors,incubation experiment for soil mineralization wasconducted with soil sampled at different slope positions of a water-eroded sloping land under different soil
organic carbon background in the Loess Hilly Region. Random sampling method was used to collect
samples in the positions of water-eroded sloping land ( control area,eroded area and deposition area) .
The dynamic characteristics of SOC mineralization were analyzed and modelled. [Results] 1 ) SOC
level,soil temperature and soil water content affected significantly the mineralization rate and
accumulated mineralization amount of SOC ( P < 0. 05) . The primary and secondary relation of the three
variables was: SOC level > soil temperature > soil water content. 2) Based on the first-order kinetic
equation,which could well describe the accumulation dynamics of soil organic carbon mineralization,a
multi-factor equation with high fitting degree was obtained by modifying the Cp value ( R2 > 0. 95) .
[Conclusions]1) Soil organic carbon content was one of the main factors affecting the soil organic
carbon mineralization at different slope positions. The response of soil organic carbon mineralization to
soil erosion on the eroded slope varied with the soil organic carbon background of the sloping land. The
mineralization of soil organic carbon was stimulated at sediment area of the slope with a lower content of
soil organic carbon,whereas it was depressed with higher organic carbon content. 2) The first-order
kinetic equation well described the accumulation dynamics of soil organic carbon mineralization ( r >
0. 98) ,its Cp value ( organic carbon mineralization potential) reflected the influence of soil organic
carbon,soil temperature,and water content on organic carbon mineralization. 3) Through modifying the
Cp value,a multi-factor equation for describing the dynamics of soil organic carbon mineralization was
obtained. This equation presented a solid fitting effect on predicting the dynamics of soil organic carbon
mineralization under different soil organic carbon levels.

Keyword土壤有机碳 水蚀坡面 矿化动态 影响因素 模拟
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8599
Collection水保所知识产出(1956---)
Affiliation1.中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
2.中国科学院大学
3.西北农林科技大学林学院
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
张亚锋,许明祥,陈盖,等. 黄土丘陵区水蚀坡面土壤有机碳矿化动态模拟[J]. 中国水土保持科学,2016,14(4):9-17.
APA 张亚锋,许明祥,陈盖,&王超华.(2016).黄土丘陵区水蚀坡面土壤有机碳矿化动态模拟.中国水土保持科学,14(4),9-17.
MLA 张亚锋,et al."黄土丘陵区水蚀坡面土壤有机碳矿化动态模拟".中国水土保持科学 14.4(2016):9-17.
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