Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area

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Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area

- Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area
- Bulletin of Soiland Water Conservation Vol. 32, Issue 1, Pages: 44-48(2013)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  2. 渭南师范学院化学与生命科学学院,陕西,渭南,714000
  3. 西北农林科技大学生命学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
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- Published：2013
- 稿件说明：
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Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 44-48.
DOI：

Effect of Different Soil Water Contents on Soil Respiratory Intensity of Robinia Pseudoacacia Forest in Loess Area[J]. Bulletin of Soiland Water Conservation, 2013, 32(1): 44-48. DOI：

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60cm);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CO

的累计释放量。结果表明

100%和20%含水量条件下各深度土壤CO

释放量为20cm土样>60cm土样>40cm土样;20cm土样去除DOC后CO

释放量明显减少

40cm明显增加

60cm没有明显变化;混合枯落物土样在100%含水量条件下CO

释放量最高;20%和2%含水量条件下刺槐枯落物CO

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。

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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