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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Q0{X/[0[;h/v0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

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Tc:s'Aj H0Influencing factors and partitioning of respiration in a Leymus chinensis steppe in Xilin River Basin,Inner Mongolia, China水利论文5R](]c:Pvr

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:vJH@6}X8m _0Based 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1et _3PY p{T

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作者:

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耿元波[1]水利论文6@4c.K Z Q{1_5oLn:E7D

7w,lsA@D0罗光强[2]水利论文g3g8m7kJ&R;R5M-o

)g;wCj,]0Author:

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&h&gq7Gi)}WDc0GENG Yuanbo[1]

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Eu(x3H@gC'f{0LUO Guangqiang[2]

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!Z g!W$QKOz0Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China水利论文5t$j7jT Qya&OL V8N

CAqV T%p)C Qx%bh0Institute 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z |#}w6qE#p b2I

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期 刊:水利论文4D5@w)WY9R

k WA)Y?X bLA0地理学报(英文版)

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ISTIC水利论文+_'Q!n|mxb

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JOURNAL OF GEOGRAPHICAL SCIENCES水利论文5c3x'c&On8@E

+`0O\*dli%XG5k Au0年,卷(期):

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~i&r~ p ?02011, 21(1)水利论文[g(kd2C'c {,V#@5}

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u [tB8` K Z0S812水利论文 A@2uCb(b%W MD

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Keywords:水利论文!Q0~,U#e%{8tT

%H3iru:boS!DyLD0Leymus chinensis steppe水利论文3g:W s:kB0fk8d8T

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ecosystem respiration水利论文qN"YP.S\^

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soil respiration水利论文 T,N'U-t3m i K

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microbial respiration

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5]xM D2j5r0temperature

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水利论文Q*\{#L$Acd

2011年8月15日

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n)pi!do P.`E0基金项目:水利论文*v&}BbgQC

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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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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水利论文u.aX\m%b$o?

;G|8GM8~,{!P0[期刊论文] 地理学报(英文版)水利论文 \3|3`W!n7R D-PR'Ig

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y/u,^%@&jk{S0Based 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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