| 黄土丘陵区坡地侵蚀对土壤呼吸的影响 |
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| 引用本文： | 裴会敏,许明祥,脱登峰.黄土丘陵区坡地侵蚀对土壤呼吸的影响[J].水土保持通报,2012,32(4):1-4. |
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| 作者姓名： | 裴会敏 许明祥 脱登峰 |
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| 作者单位： | 1. 西北农林科技大学林学院,陕西杨凌,712100
2. 西北农林科技大学林学院,陕西杨凌712100 中国科学院水利部水土保持研究所,陕西杨凌712100 |
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| 基金项目： | 国家自然科学基金项目“黄土高原深层土壤有机碳固存及对土地利用/覆被变化的响应”(41171228);中科院战略性先导科技专项子课题“西北农田土壤固碳潜力与速率研究”(XDA05050504);中科院知识创新重要方向项目“黄土高原退耕还林还草对陆地生态系统C循环的影响”(KZCX2-YW-443) |
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| 摘 要： | 以黄土丘陵区两种肥力水平的坡地土壤为研究对象,采用人工模拟侵蚀(表土剥离0,5,10cm)和动态密闭气室法(Li-8100,USA),探讨了坡地不同侵蚀强度下土壤呼吸的变化特征及水热因子对土壤呼吸的影响。结果表明:(1)一定温度和湿度条件下,强度侵蚀显著降低土壤呼吸速率(P<0.05),其影响程度与土壤肥力有关,高肥土壤侵蚀5cm后呼吸速率较未侵蚀土壤降低了32%,而低肥土壤呼吸速率降低了14%;(2)两种肥力土壤呼吸的侵蚀效应在干湿交替前后表现出不同的变化规律,降雨使土壤呼吸速率激增,且放大了表土流失的侵蚀效应;(3)观测期内土壤呼吸速率与土壤湿度呈显著正相关,而与土壤温度无明显相关性,说明短期内影响侵蚀土壤呼吸速率日际变化的主要因子为土壤湿度;(4)在计算坡面CO2排放时若忽视侵蚀的影响,将可能高估侵蚀引起的原位碳排放效应。严重表土流失可能通过影响土壤呼吸而改变陆地生态系统碳平衡。
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| 关 键 词： | 土壤呼吸 表土流失 黄土丘陵区 |
| 收稿时间： | 2012/2/20 0:00:00 |
Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region |
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| PEI Hui-min,XU Ming-xiang and TUO Deng-feng.Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region[J].Bulletin of Soil and Water Conservation,2012,32(4):1-4. |
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| Authors: | PEI Hui-min XU Ming-xiang and TUO Deng-feng |
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| Institution: | 1(1.Forestry College,Northwest A & F University,Yangling,Shaanxi 712100,China;2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China) |
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| Abstract: | To understand the effects of erosion on soil respiration(Rs),we analyzed temporal variations of Rs on the slope lands and its relationship with soil temperature and moisture under artificial stimulated erosion conditions(top soils removed at the depths of 0,5,10cm,referred to as E0,E5and E10)with a dynamic closed chamber.Two type of lands in which the fertility levels differed distinctly were chosen to deploy the experiments.The results indicate that with similar temperature and rainfall,the rates of Rswere affected significantly by erosion and the affecting degree was related closely to the fertility level of the land.Comparing to the control(original soil without removal of top soil),the Rsrates of the soils with the erosion level of E5 decreased by 32%and 14%in the fertile and poor soils,respectively.The rainfall stimulated the Rsrates and amplified the effects of erosion on the Rsrates.Soil moisture contents were closely correlated with the Rs rates,and conversely,the soil temperature was not.Soil moisture was the main controlling factor responsible for the variations of soil respiration rates during water erosion events.The results suggested that the effects of erosion on Rsrates should be considered in understanding and estimating carbon loss in the loess hilly region.Soil erosion may alter the carbon balance through dynamic changes of Rsin these ecosystems,which could have important negative consequences for ecosystem functions and sustainability. |
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| Keywords: | soil respiration surface soil loss loess hilly region |
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