Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region

PEI Hui-min; XU Ming-xiang; TUO Deng-feng

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Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region

- Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region
- Bulletin of Soiland Water Conservation Vol. 31, Issue 4, Pages: 1-4(2012)
- 作者机构：
  
  1. 西北农林科技人学林学院, 陕西杨凌,712100
  2. 中国科学院水利部水上保持研究所, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：
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- Published：2012
- 稿件说明：
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PEI Hui-min, XU Ming-xiang, TUO Deng-feng. Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 1-4.
DOI：

PEI Hui-min, XU Ming-xiang, TUO Deng-feng. Effects of Erosion on Soil Respiration on Slopeland in Loess Hilly Region[J]. Bulletin of Soiland Water Conservation, 2012, 31(4): 1-4. DOI：

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CO

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．

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

10 cm

referred to as E0

E5 and 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 Rs were affected sig-nificantly 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 Rs rates 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 Rs rates and amplified the effects of erosion on the Rs rates. Soil moisture contents were closely correlated with the Rs rates

and conversely

the soil temperature was not. Soil moisture was the main controlling factor responsi-ble for the variations of soil respiration rates during water erosion events. The results suggested that the effects of erosion on Rs rates 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 Rs in these ecosystems

which could have important negative consequences for ecosystem functions and sustainability.

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