Effect of stocking rate on soil-atmosphere CH4 flux during spring freeze-thaw cycles in a northern desert steppe, China.
Effect of stocking rate on soil-atmosphere CH4 flux during spring freeze-thaw cycles in a northern desert steppe, China.
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北方荒漠草原春季冻融循环期间放养率对土壤-大气CH4通量的影响
DOI：
10.1371/journal.pone.0036794
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Huang D
中科院分区：
文献类型：
--
作者：
Wang CJ;Tang SM;Wilkes A;Jiang YY;Han GD;Huang D
背景草原土壤对甲烷(CH4)的吸收受多种特定因素的影响，是一个复杂的过程。放牧率的增加促进了草原退化，对气体交换的后果尚不清楚。为了评估放牧管理对荒漠草原CH4吸收的影响，我们研究了冬春过渡期土壤-大气CH4交换。方法/主要研究结果本实验在12个放牧小区进行，每个放牧梯度上有4个处理，有3个重复：不放牧(0只羊/公顷，NG)、轻牧(0.75只羊/公顷，LG)、中牧(1.50只羊/公顷，MG)和重度放牧(2.25只羊/公顷，HG)。使用自动空腔衰荡分光光度计，测量了2010年3月1日至4月29日和2011年3月2日至4月27日的甲烷通量。根据土壤冻融循环(土壤正、负温度交替出现)的状况，将试验分为阶段I和阶段II。结果表明，阶段I(7.51ugCH4-Cm−2 h−1)对CH4的平均吸收显著低于阶段II(83.0 7µgCH4-Cm−2 h−1)。平均超过2年，冻融期的甲烷通量为−84.76ugCH4-Cm−2 h−1(NG)，−88.76ugCH4-Cm−2 h−1(LG)，−64.77ugCH4-Cm−2 h−1(MG)和−28.80ugCH4-Cm−2 h−1(HG)。结论/意义CH4摄取活性受冻融周期和放养率的影响。土壤对CH4的吸收与土壤的含水率和温度有关。在中国北部荒漠草原春季冻融循环中，镁和汞降低了甲烷的吸收，而汞对甲烷的吸收有相当大的促进作用。
Background Methane (CH4) uptake by steppe soils is affected by a range of specific factors and is a complex process. Increased stocking rate promotes steppe degradation, with unclear consequences for gas exchanges. To assess the effects of grazing management on CH4 uptake in desert steppes, we investigated soil-atmosphere CH4 exchange during the winter-spring transition period. Methodology/Main Finding The experiment was conducted at twelve grazing plots denoting four treatments defined along a grazing gradient with three replications: non-grazing (0 sheep/ha, NG), light grazing (0.75 sheep/ha, LG), moderate grazing (1.50 sheep/ha, MG) and heavy grazing (2.25 sheep/ha, HG). Using an automatic cavity ring-down spectrophotometer, we measured CH4 fluxes from March 1 to April 29 in 2010 and March 2 to April 27 in 2011. According to the status of soil freeze-thaw cycles (positive and negative soil temperatures occurred in alternation), the experiment was divided into periods I and II. Results indicate that mean CH4 uptake in period I (7.51 µg CH4–C m−2 h−1) was significantly lower than uptake in period II (83.07 µg CH4–C m−2 h−1). Averaged over 2 years, CH4 fluxes during the freeze-thaw period were −84.76 µg CH4–C m−2 h−1 (NG), −88.76 µg CH4–C m−2 h−1 (LG), −64.77 µg CH4–C m−2 h−1 (MG) and −28.80 µg CH4–C m−2 h−1 (HG). Conclusions/Significance CH4 uptake activity is affected by freeze-thaw cycles and stocking rates. CH4 uptake is correlated with the moisture content and temperature of soil. MG and HG decreases CH4 uptake while LG exerts a considerable positive impact on CH4 uptake during spring freeze-thaw cycles in the northern desert steppe in China.
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发表时间：
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期刊：
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