内蒙古锡林河流域羊草草原植物生长旺季呼吸的影响因素分析和区分 Influencing factors and partitioning of respirat

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Influencing factors and partitioning of respiration in a Leymus chinensis steppe in Xilin River Basin,Inner Mongolia, China

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Abstract:水利论文+aDU"V [ ?*~

&h(xd)Xz2L(Um;Q0Based on the static opaque chamber method, the respiration rates of soil microbial respiration, soil respiration, and ecosystem respiration were measured through continuous in-situ experiments during rapid growth season in semiarid Leymus chinensis steppe in the Xilin River Basin of lnner Mongolia, China. Soil temperature and moisture were the main factor affecting respiration rates. Soil temperature can explain most CO2 efflux variations (R2=0.376-0.655) excluding data of low soil water conditions. Soil moisture can also effectively explain most of the variations of soil and ecosystem respiration (R2=0.314-0.583), but it can not explain much of the variation of microbial respiration (R2=0.063). Low soil water content (≤5%) inhibited CO2 efflux though the soil temperature was high. Rewetting the soil after a long drought resulted in substantial increases in CO2 flux at high temperature. Bivariable models based on soil temperature at 5 cm depth and soil moisture at O-10 cm depth can explain about 70% of the variations of CO2 effluxes. The contribution of soil respiration to ecosystem respiration averaged 59.4%, ranging from 47.3% to 72.4%; the contribution of root respiration to soil respiration averaged 20.5%, ranging from 11.7% to 51.7%. The contribution of soil to ecosystem respiration was a little overestimated and root to soil respiration little underestimated because of the increased soil water content that occurred as a result of plant removal.水利论文*{#n%_^vPN%~

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:L[9v2p'DP3Ko?0耿元波[1]水利论文,M+?Mr!@;K

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GENG Yuanbo[1]水利论文~'W"^ar]

1^!F#jz;Ykf?0LUO Guangqiang[2]

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Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China

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8r%E8h|~[ {*P(V0Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China水利论文 d _@j \8[

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Journal:

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x|5@$~7S/X0JOURNAL OF GEOGRAPHICAL SCIENCES

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年,卷(期):

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2011, 21(1)水利论文nMMF*q

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Leymus chinensis steppe水利论文.b4ve9?3z?q;hf p&{%M

u$QD3gW3~){ x0ecosystem respiration

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soil respiration

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microbial respiration水利论文'A5W-cD+~2D\,b

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temperature

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moisture水利论文5u6P:K7kui

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1v.opi%VJ0在线出版日期:

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2011年8月15日水利论文)mfONUb&V

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基金项目:水利论文d;`b7N+l(WrL

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National Natural Science Foundation of China,National Key Technologies R&D Program during the 1lth Five-year Plan of China,Independent Innovation Project of Institute of Geographic Sciences and Natural Resources Research,CAS

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,ia:S}^ aC0Based on the static opaque chamber method, the respiration rates of soil microbial respiration, soil respiration, and ecosystem respiration were measured through continuous in-situ experiments during r...

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