引用本文:黄诚诚,王迎春,张渐飞,王立刚.东北黑土典型坡耕地土壤呼吸特征的研究[J].中国生态农业学报,2018,26(1):1-7
HUANG Chengcheng,WANG Yingchun,ZHANG Jianfei,WANG Ligang.Characteristics of soil respiration on typical cropland slope in mollisol region of Northeast China[J].Chinese Journal of Eco-Agriculture,2018,26(1):1-7
DOI:10.13930/j.cnki.cjea.170569
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东北黑土典型坡耕地土壤呼吸特征的研究
黄诚诚1, 王迎春1, 张渐飞2, 王立刚1
1.中国农业科学院农业资源与农业区划研究所/农业部面源污染控制重点实验室/中国农业科学院-美国新罕布什尔大学可持续农业生态系统联合实验室 北京 100081;2.黑龙江省绥化市青冈县人民办事中心 青冈 151600
摘要:  本研究以东北黑土典型坡耕地为研究对象,利用LI-8100土壤呼吸测量仪对玉米全生育期土壤呼吸进行了原位监测,分析了坡耕地不同部位(坡顶、坡肩、坡背、坡趾)土壤呼吸速率变化规律、土壤呼吸总量、土壤呼吸速率与土壤水热因子之间的关系。结果表明:该地区土壤呼吸速率呈现"春秋季低夏季高"的季节性变化规律,坡趾位置土壤呼吸峰值显著高于坡顶、坡肩、坡背位置(P<0.05)。不同部位土壤呼吸速率与土壤温度呈现显著线性关系(P<0.05),与土壤含水量相关性不显著(P>0.05)。土壤呼吸总量以坡趾位置最高[523.97 g(CO2-C)·m-2],显著高于坡背[443.13 g(CO2-C)·m-2]、坡肩[426.81 g(CO2-C)·m-2]、坡顶[388.5 g(CO2-C)·m-2]3个位置18.5%、22.8%和34.9%(P<0.05)。说明黑土坡耕地不同位置土壤呼吸存在显著差异,准确评价黑土坡耕地土壤呼吸需要综合考虑坡耕地不同坡位的差异,减少引用平地监测结果来评估坡耕地土壤呼吸量所造成的偏差。
关键词:  黑土  坡耕地  土壤呼吸  土壤温度  土壤湿度
中图分类号:S-3
基金项目:国家自然科学基金项目(31770486)、公益性行业(农业)科研专项(201303126-2,201303103)、国家重点研发计划项目(2016YFE0101100)和中国农业科学院创新工程(CAAS-XTCX2016008-02)资助
Characteristics of soil respiration on typical cropland slope in mollisol region of Northeast China
HUANG Chengcheng1, WANG Yingchun1, ZHANG Jianfei2, WANG Ligang1
1.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China;2.Heilongjiang Province Qinggang County People's Service Center, Qinggang 151600, China
Abstract:  The characteristics of soil respiration in cropland slopes are different from those in cropland plains. In order to accurately evaluate greenhouse gases emission in Northeast China farmland, it was necessary to study the patterns and factors influencing soil respiration in different cropland slopes. The study was conducted on a typical cropland slope in a mollisol region in Northeast China. An entire cropland slope was divided into four slope positions based on change in gradient-summit, shoulder-slope, back-slope and toe-slope. The LI-8100 probe was used to monitor soil respiration throughout the maize growing period. Water content and temperature of the surface soil (0-20 cm soil layer) were respectively measured using soil moisture meter and thermometer. The relationship between soil carbon dioxide (CO2) flux and the impact of temperature, soil moisture content were then analyzed for different slop positions (summit, shoulder-slope, back-slope and toe-slope). The study laid the basis for scientific evaluation of soil respiration and carbon balance in mollisol in cropland slopes. The results showed that CO2 flux in summer was higher than in spring and autumn. Peak soil respiration occurred during the period from maize silking to tasseling, which was from July 3 to August 23 in the study area. During this period, the cumulative respiration was 58.7%-59.9% of total soil respiration for the whole growing period of maize across the four slope positions, indicating it was the main period of soil respiration in mollisol regions in Northeast China. The peak rate of soil respiration was significantly different in each slope position (P < 0.05). It was significantly higher in the toe-slope position[7.56 μmol(CO2)·m-2·s-1] than at the summit[5.60 μmol(CO2)·m-2·s-1], shoulder-slope[6.08 μmol(CO2)·m-2·s-1] and back-slope[6.47 μmol(CO2)·m-2·s-1]. The results showed that soil respiration rates among different slope positions in typical mollisol regions were significantly different, especially in summer. CO2 flux had a positive, linear correlation with soil temperature for all the slope positions (P < 0.05). The exponential equation best expressed the relationship between soil temperature and soil respiration rate. Then temperature sensitivity (Q10) was the strongest for the back-slope position, compared with the others. There was an insignificant correlation between soil respiration and soil volumetric water content. These results indicated that change in soil temperature significantly influenced soil respiration rate. The cumulative emission of CO2 in toe-slope[523.97 g(CO2-C)·m-2] was 18.5%, 22.8% and 34.9% higher than in back-slope[443.13 g(CO2-C)·m-2], shoulder-slope[426.81 g(CO2-C)·m-2] and summit[388.50 g(CO2-C)·m-2], respectively. This was caused by the migration and redistribution of organic carbon, the change in soil bulk density, and the related effect on soil under the different environmental factors. The results of the study suggested that it was necessary to consider the respiration characteristics of different slope positions in order to limit any deviations in the monitoring results based on cropland plains respiration in the scientific evaluation of soil respiration on cropland slopes.
Keyword:  Mollisol  Cropland slope  Soil respiration  Soil temperature  Soil moisture content
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