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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):1-9.[doi:10.3724/SP.J.1145.2017.09027]
 ZHANG Yanru,CHEN Qiuwen,et al.Seasonal and interannual variation of soil respiration in four vegetation types on the loess hilly region*[J].Chinese Journal of Applied & Environmental Biology,2018,24(04):1-9.[doi:10.3724/SP.J.1145.2017.09027]
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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:
1-9
栏目:
研究论文
出版日期:
2018-08-25

文章信息/Info

Title:
Seasonal and interannual variation of soil respiration in four vegetation types on the loess hilly region*
文章编号:
201709027
作者:
张艳如1 2 陈秋文1 2 孙美美2 3 时伟宇4 杜盛2 3**
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**
1College of Forestry, Northwest A&F University, Yangling 712100, China 2State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China 3Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100,China 4School 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 Plateau growing season
DOI:
10.3724/SP.J.1145.2017.09027
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。本文以黄土丘陵区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了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,测定分析了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;在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:
Carbon (C) stocks are the largest C pool in terrestrial ecosystems, and CO2 emission through soil respiration contributes to major parts of soil C spending and atmospheric C source. Soil respiration is also one of the major processes controlling C budget of terrestrial ecosystems. A slight change of soil CO2 emission might cause drastic variation of global C balance. Therefore, it is of great significance to investigate soil respiration characteristics of various vegetation types in a long period and to figure out its relationship with soil temperature and moisture variables. Here, we conducted monthly measurements of soil respiration rate in the growing seasons (from April to October) of 2011, 2013 and 2014 using Li-8100 CO2 flux measurement system in the central Loess Plateau. Four vegetation types were chosen for the periodical measurements, which consist of a natural oak (Quercus liaotungensis) forest, a naturaloriental arborvitae (Platycladus orientalis) forest, a black locust (Robinia pseudoacacia) plantation, and a natural shrub land. A permanent sample plot was established in each vegetation type, and five polyvinyl chloride (PVC) collars were placed in each plot for the measurements. Soil temperature and water content at the top 12 cm depth near each collar were measured using a digital soil temperature probe and a TDR 200 soil moisture meter at the same time as the soil respiration measurement. Soil respiration rates were fitted to soil temperature and moisture with exponential function, power function, linear function, and a combined equation for the two variables, respectively. The results showed that: (1) The seasonal variation tendencies of soil respiration rates in the four vegetation types were almost the same, which were lower in the earlier period and then increased to high levels in the middle and later periods. (2) In the same measured month the soil respiration rates varied with vegetation, following a descending sequence as oak forest > oriental arborvitae forest > shrub> black locust plantation. (3) The average values of soil respiration rates in the three years were 2.77, 3.48 and 5.08 μmol m-2 s-1, respectively. Variations with years were higher than variations with vegetation types. (4) Soil respiration rate was positively correlated with soil temperature and soil moisture in all the vegetation types. It was better fitted by the equation including both soil temperature and moisture variables than by a single factor. Our results suggested that there were both seasonal and inter-annual variations of soil respiration in the four vegetation types in the region. Soil temperature and soil water content both are major regulating factors and the soil respiration within this site is more affected by environment factors than the types of vegetation.

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备注/Memo

备注/Memo:
收稿日期:2017-09-15 接受日期:2017-09-29
*国家自然科学基金项目(41171419, 41201258, 41411140035, 41471440)资助
**通讯作者(E-mail: shengdu@ms.iswc.ac.cn)
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更新日期/Last Update: 2017-11-15