| 黄土区刺槐林土壤含水量变化对土壤呼吸强度的影响 |
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| 引用本文： | 吕海波,梁宗锁.黄土区刺槐林土壤含水量变化对土壤呼吸强度的影响[J].水土保持通报,2013,33(1):44-48,52. |
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| 作者姓名： | 吕海波 梁宗锁 |
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| 作者单位： | 1. 中国科学院水利部水土保持研究所,陕西杨凌712100;渭南师范学院化学与生命科学学院,陕西渭南714000
2. 中国科学院水利部水土保持研究所,陕西杨凌712100;西北农林科技大学生命学院,陕西杨凌712100 |
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| 基金项目： | 中国科学院知识创新项目“土壤—植被—大气界面碳传输的各环节的物理特征和生理生态过程与C库的源汇效应研究”(KZCX2-XB2-05-01);陕西省教育厅项目“大荔沙苑温室西瓜滴灌可行性及最优灌溉制度研究”(12JK0814);渭南市科技创新项目“渭南地区主要农作物秸秆搭配还田的增肥效果研究”(2012JCYJ-7) |
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| 摘 要： | 通过室内培养实验来评估土壤含水量的变化对土壤枯落物层、不同深度土壤层及DOC淋失后的土壤呼吸的影响.采集安塞纸坊沟31a刺槐林土样及林下混合枯落物,通过碱液吸收法测定100％,20％和2％含水量条件下3个深度土样(20,40和60 cm)；去除DOC土样(仅100％含水量条件下)；3种处理枯落物混合土样(林下混合枯落物、刺槐枯落物和草本类枯落物)培养过程中CO2的累计释放量.结果表明,100％和20％含水量条件下各深度土壤CO2释放量为20 cm土样＞60 cm土样＞40 cm土样；20 cm土样去除DOC后CO2释放量明显减少,40 cm明显增加,60 cm没有明显变化；混合枯落物土样在l00％含水量条件下CO2释放量最高；20％和2％含水量条件下刺槐枯落物CO2释放量明显大于草类,而100％含水量条件下草类枯落物略大于刺槐枯落物.研究证明土壤含水量对SOC组分含量和枯落物种类不同的土壤层呼吸强度存在差异性影响,强降水对DOC的淋失可造成表层土壤呼吸的减弱.
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| 关 键 词： | CO2释放量 土壤呼吸 溶解性有机碳 土壤深度 |
| 收稿时间： | 2011/12/21 0:00:00 |
| 修稿时间： | 2012/4/14 0:00:00 |
Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area |
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| L&#; Hai-bo and LIANG Zong-suo.Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area[J].Bulletin of Soil and Water Conservation,2013,33(1):44-48,52. |
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| Authors: | L&#; Hai-bo and LIANG Zong-suo |
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| Institution: | 1,3(1.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;2.College of Chemistry and Life Science,Weinan Normal University, Weinan,Shaanxi 714000,China;3.College of Life Science,Northwest A&F University,Yangling,Shaanxi 712100,China) |
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| Abstract: | An incubational experiment was designed to assess how soil water content affects the respiratoryintensities of litter layers,different soil layers and DOC-removed soil samples.Soil and mixed litter sampleswere taken in 31year Robinia pseudoacaciaforest in Zhifanggou Watershed,Ansai County.The accumulative CO2-release amounts of soil samples and DOC-removed soil samples(100% water content only)at threesoil depths(20,40and 60cm)and in three controlled litter-mixed soil samples(mixed by complex litters,including Robinia pseudoacacialitters and herbage litters)were determined in laboratory under the three soilwater contents of 100%,20% and 2%,respectively.Results showed that the CO2-release levels at the different soil depths were in the order of:20cm >60cm >40cm under the controlled 100% and 20% watercontents.Under the 100% water content and after DOC was removed,the accumulative CO2-release amountof the soil samples at the 20cm depth decreased,but obviously increased for samples at the 40cm soil depthand had no remarkable change at the 60cm soil depth.The accumulative CO2-release amount of complex litter-mixed soil samples was the highest under the 100% water content.The amount of simply Robinia pseudoacacialitter-mixed samples was obviously higher than that of herbage litter-mixed samples under the 20% and 2% water contents,but slightly lower under the 100% water content.The asynchronous effect of water content levels is suggested on the respiratory intensity of the soil layers with different SOC compositions andlitter types.Removed DOC by heavy precipitation from soil subsurface layers can reduce respiratory intensityof surface soil layers. |
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| Keywords: | CO2-release soil respiration dissolved organic carbon soil depth |
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