Priming of soil carbon decomposition in two Inner Mongolia grassland soils following sheep dung addition: a study using ¹³C natural abundance approach.
Priming of soil carbon decomposition in two Inner Mongolia grassland soils following sheep dung addition: a study using ¹³C natural abundance approach.
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DOI：
10.1371/journal.pone.0078578
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Wang C
中科院分区：
文献类型：
--
作者：
Ma X;Ambus P;Wang S;Wang Y;Wang C
为研究羊粪对土壤固碳的影响，采用152 d的培养试验，对内蒙古两种不同类型的草原土壤进行了研究，即代表顶极群落的羊草（Leymus chinensis）占优势的草原（有机质含量为2.1%）和严重退化的冷蒿（Artemisia frigida）占优势的草原（有机质含量为1.3%）。从饲喂L. chinensis（C3植物，δ 13 C = −26.8‰;粪便δ 13 C = −26.2‰）或糙隐子草（C4植物，δ 13 C = −14.6‰;粪便δ 13 C = −15.7‰）。 新鲜的C3和C4羊粪与两个草原土壤混合，并在受控条件下培养13 C-CO2排放分析。分别于添加羊粪后17、43、86、127和152 d采集土壤样品，检测土壤和羊粪组分的δ 13 C信号。结果表明，羊粪碳的分解率分别为16.9%和16.6%，其中3.5%和2.8%固定在土壤中。chinensis和A. frigida草原，分别，而其余的分解羊粪排放的二氧化碳。在152天内，从粪便处理的土壤中呼吸的累积碳量比未改良的对照高7-8倍。在这两个草原土壤，CA。60%的CO_2来自羊粪分解，40%来自土壤C.在这两种土壤中都观察到了土壤碳分解的引发效应，即L.土壤中以CO2形式排放了1.4 g和1.6 g额外的土壤C kg−1干土。chinensis和A.寒地土壤。因此，L的净C损失。chinensis和A.寒冷土壤分别为0.6 g和0.9 g C kg-1土壤，分别占L总C的2.6%和7.0%。chinensis和A. frigida草原土壤，分别。研究结果表明，内蒙古退化草地放牧可能会导致土壤C净流失，这是由于正启动效应，从而加速了土壤退化。
To investigate the effect of sheep dung on soil carbon (C) sequestration, a 152 days incubation experiment was conducted with soils from two different Inner Mongolian grasslands, i.e. a Leymus chinensis dominated grassland representing the climax community (2.1% organic matter content) and a heavily degraded Artemisia frigida dominated community (1.3% organic matter content). Dung was collected from sheep either fed on L. chinensis (C3 plant with δ13C = −26.8‰; dung δ13C = −26.2‰) or Cleistogenes squarrosa (C4 plant with δ13C = −14.6‰; dung δ13C = −15.7‰). Fresh C3 and C4 sheep dung was mixed with the two grassland soils and incubated under controlled conditions for analysis of 13C-CO2 emissions. Soil samples were taken at days 17, 43, 86, 127 and 152 after sheep dung addition to detect the δ13C signal in soil and dung components. Analysis revealed that 16.9% and 16.6% of the sheep dung C had decomposed, of which 3.5% and 2.8% was sequestrated in the soils of L. chinensis and A. frigida grasslands, respectively, while the remaining decomposed sheep dung was emitted as CO2. The cumulative amounts of C respired from dung treated soils during 152 days were 7–8 times higher than in the un-amended controls. In both grassland soils, ca. 60% of the evolved CO2 originated from the decomposing sheep dung and 40% from the native soil C. Priming effects of soil C decomposition were observed in both soils, i.e. 1.4 g and 1.6 g additional soil C kg−1 dry soil had been emitted as CO2 for the L. chinensis and A. frigida soils, respectively. Hence, the net C losses from L. chinensis and A. frigida soils were 0.6 g and 0.9 g C kg−1 soil, which was 2.6% and 7.0% of the total C in L. chinensis and A. frigida grasslands soils, respectively. Our results suggest that grazing of degraded Inner Mongolian pastures may cause a net soil C loss due to the positive priming effect, thereby accelerating soil deterioration.
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温带半干旱草原的年甲烷吸收量受载畜率、地上植物生物量和表土透气性的调节
影响因子：
11.6
作者：
Chen, Weiwei;Wolf, Benjamin;Han, Xingguo
通讯作者：
Han, Xingguo
影响因子：
9.7
作者：
Kristiansen, SM;Brandt, M;Christensen, BT
通讯作者：
Christensen, BT
DOI：
10.1002/jpln.200421412
发表时间：
2004-12-01
期刊：
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
影响因子：
--
作者：
Kuzyakov, Y;Bol, R
通讯作者：
Bol, R
影响因子：
9.7
作者：
Kuzyakov, Y;Bol, R
通讯作者：
Bol, R
影响因子：
9.7
作者：
Blagodatskaya, E.;Yuyukina, T.;Kuzyakov, Y.
通讯作者：
Kuzyakov, Y.