干旱荒漠区河岸带土壤碳格局和成因  

Pattern and Causes of Soil Carbon Distribution in Riparian Zone in Arid Desert Area

作　　者：张雪妮[1,2] 吕光辉[1,2] 贡璐[1,2] 秦璐[1,2] 何学敏[1,2] 刘昊奇[1,2] 

机构地区：[1]新疆大学资源与环境科学学院,新疆乌鲁木齐830046 [2]绿洲生态教育部重点实验室,新疆乌鲁木齐830046

出　　处：《土壤通报》2013年第6期1385-1391,共7页Chinese Journal of Soil Science

基　　金：国家自然科学重点基金(41130531);教育部创新团队项目(IRT1180)资助

摘　　要：利用多元回归和通径分析相结合的方法，基于各样带（T1～T3）土壤有机碳（SOC）和土壤无机碳（SIC）分布格局和差异性特征，剖析土壤碳的影响因素及其互作机制。结果表明：（1）浅层SOC（0-20cm）和sm（0～10cm）的样带间差异较显著，SOC和SIC在样带问的总体顺序均为T1〉T2〉T3；（2）全氮是影响样带-SOC的主要直接因素，土壤含水率、pH值和电导率通过全氮的负向作用间接影响SOC；影响样带二SOC的4个直接因素作用均衡，间接通径为其相互问的正作用；电导率是样带三SOC的主要决策因素。（3）影响样带-SIC的5个直接通径中海拔作用最大，间接通径主要为海拔、植被类型和容重问的互作；样带二SIC的主要决策因素为土壤含水量；土壤类型和海拔是影响样带三SIC的直接和间接通径。（4）不同样带SOC和SIC的影响机制各具特征，微尺度的土壤碳格局和成因分析对于区域碳循环异质性研究十分必要。Based on the distribution pattern and difference characteristics of soil organic carbon （SOC） and soil inorganic carbon （SIC） on each transect （T1 - T3）, this paper researched influencing factors and their interaction mechanisms on soil carbon by employing method of multiple regression and path analysis. The results indicated： （1） Among transects, the differences of SOC （0 - 20 cm） and SIC （0 - 10 era） of surface subsamples were more significant compared to the deeper ones, and both of SOC and SIC in the transects presented an overall trend of TI〉T2〉T3. （2） TN was an important direct influencing factor on SOC in the first transect, while the other factors like soil water content, pH value and electric conductivity influenced the TN through the negative orienting effect of SOC in the first transect. Direct effects of electric conductivity, soil water content, elevation and TN on SOC of the second transect were in equilibrium condition, and the main indirect effects of the second transect were positive interaction among soil water content, electric conductivity and elevation. The main determining factor of SOC in the third transect was electric conductivity. （3） Among the five factors directly influencing SIC in the first transect, the elevation made the greatest contribution, and the interactions of elevation, vegetation type and bulk density were the main indirect effects on SIC of the first transect. Soil water content was main determining factor on SIC of the second transect. Soil type and elevation composed direct and indirect impacts on SIC of the third transect. with transects, analysis on distribution and causes of soil carbon Influencing mechanism of SOC and SIC varied fine scale were necessary to explore regional carbon recycle heterogeneity researches.

关 键 词：荒漠区 样带 通径分析 土壤有机碳 土壤无机碳 影响因素 

分 类 号：S153[农业科学—土壤学]