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[1]张艳如,陈秋文,孙美美,等.黄土丘陵区4种植被类型土壤呼吸季节及年际变化[J].应用与环境生物学报,2018,24(04):729-734.[doi:10.19675/j.cnki.1006-687x.2017.09027]
 ZHANG Yanru,CHEN Qiuwen,et al.Seasonal and interannual variation of soil respiration in four vegetation types in the loess hilly region[J].Chinese Journal of Applied & Environmental Biology,2018,24(04):729-734.[doi:10.19675/j.cnki.1006-687x.2017.09027]
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黄土丘陵区4种植被类型土壤呼吸季节及年际变化()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
24卷
期数:
2018年04期
页码:
729-734
栏目:
研究论文
出版日期:
2018-08-20

文章信息/Info

Title:
Seasonal and interannual variation of soil respiration in four vegetation types in the loess hilly region
作者:
张艳如陈秋文孙美美时伟宇杜盛
1西北农林科技大学林学院 杨凌 712100 2西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室 杨凌 712100 3中国科学院水利部水土保持研究所 杨凌 712100 4西南大学地理科学学院 重庆 400715
Author(s):
ZHANG Yanru1 2 CHEN Qiuwen1 2 SUN Meimei2 3 SHI Weiyu4 & DU Sheng2 3**
1 College of Forestry, Northwest A&F University, Yangling 712100, China 2 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China 3 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China 4 School of Geographical Sciences, Southwest University, Chongqing 400715, China
关键词:
土壤呼吸土壤湿度土壤温度黄土丘陵区生长季
Keywords:
soil respiration soil moisture soil temperature loess hilly region growing season
分类号:
S714
DOI:
10.19675/j.cnki.1006-687x.2017.09027
摘要:
土壤碳库是陆地生态系统中的最大碳库,通过土壤呼吸向大气排放CO2是土壤碳固存的重要支出项. 以黄土丘陵区4种典型植被类型(天然辽东栎林、人工刺槐林、天然侧柏林、天然灌丛)为研究对象. 在各植被类型中设置20 m × 20 m的样方,在每个样方的四角和中心分别设立一个PVC环,测定分析3个生长季(2011、2013、2014年)林地土壤呼吸特征及其对主要环境因子的响应. 结果表明,各林地生长季内土壤呼吸表现出明显的季节变化规律,前期较低,中后期达到较高水平,4种植被类型呈现大致相同的变化趋势. 不同植被类型间土壤呼吸水平存在一定差异,总体表现为辽东栎林>侧柏林>灌丛>刺槐林. 3个生长季土壤呼吸速率在植被类型间的变异系数较年际的变异系数低. 4种植被类型的土壤温湿度与土壤呼吸的相关关系都极显著(P < 0.01),但土壤呼吸速率对土壤湿度的响应更敏感,刺槐林尤为突出. 用土壤温度和土壤湿度共同拟合土壤呼吸速率效果良好,可以较好地解释某种植被类型对环境条件的响应规律. 综上,在黄土丘陵区,4种植被类型土壤呼吸具有明显的季节性;就年际变化来看环境因素对其影响大过植被类型间的影响;干旱半干旱地区土壤湿度对土壤呼吸的影响更显著,且土壤温度与土壤湿度共同拟合对土壤呼吸解释性更强. (图1 表6 参29)
Abstract:
Soit carbon (C) stock is the largest C pool in terrestrial ecosystems, and the emission of CO2 through soil respiration contributes to the majority of soil C expenditure and atmospheric C. Soil respiration is also one of the major processes controlling the C budget of terrestrial ecosystems. A slight change in soil CO2 emission might cause drastic variations in global C balance. Therefore, it is of great significance to investigate the characteristics of soil respiration of soils growing different types of vegetation over a long period, and determine its relationship with variables such as soil temperature and moisture. The rate of soil respiration was measured each month in the growing seasons (from April to October) of 2011, 2013, and 2014 using the Li-8100 CO2 flux measurement system in the central Loess Plateau. Four types of vegetation (Quercus liaotungensis, Platycladus orientalis, Robinia pseudoacacia, and a natural shrub) were chosen for the periodical measurements. A permanent sample plot was established for each type of vegetation, and five polyvinyl chloride (PVC) collars were placed in each plot for the measurements. The temperature and water content of the soil in the upper 12 cm near the collar were measured using a digital soil temperature probe and a TDR 200 soil moisture meter at the same time when the soil respiration was measured. The soil respiration rates were fitted to the soil temperature and moisture with an exponential function, power function, linear function, and an equation combining the two variables. The results showed that: (1) the seasonal variation in the rates of soil respiration in the soils growing the four types of vegetation were almost the same, and were lower in the earlier period and then increased to high levels in the middle and later periods; (2) the rates of soil respiration in the same month varied with the type of vegetation grown, and were in the descending order: Q. liaotungensis > P. orientalis > shrub > R. pseudoacacia; (3) the average values of the rates of soil respiration in 2011, 2013, and 2014 were 2.77, 3.48, and 5.08 μmol m-2 s-1, respectively. The variation in soil respiration was higher across the three years than the variation for the types of vegetation grown; and (4) the rate of soil respiration was positively correlated to soil temperature and moisture for all the types of vegetation. A better fit was obtained by using the equation that included both the variables, soil temperature and moisture, than by an equation that included a single factor. Our results suggested that both seasonal and inter-annual variations of soil respiration occurred in the soils growing the four types of vegetation in the region. The temperature and water content of soils are the major regulating factors, and soil respiration in the Loess Plateau is more greatly affected by environment factors than by the type of vegetation.

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更新日期/Last Update: 2018-08-25