| 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 |
| |
| 引用本文： | 耿元波,罗光强.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[J].地理学报(英文版),2011,21(1):163-175. |
| |
| 作者姓名： | 耿元波 罗光强 |
| |
| 作者单位： | Institute of Geographic Sciences and Natural Resources Research,CAS;Graduate University of Chinese Academy of Sciences |
| |
| 基金项目： | Foundation： National Natural Science Foundation of China, No.41071138; National Key Technologies R＆D Program during the 1 lth Five-year Plan of China, No.2006BAJ 10B04; Independent Innovation Project of Institute of Geographic Sciences and Natural Resources Research, CAS, No.200905009 |
| |
| 摘 要： | Based 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 Inner 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. Bi-variable models based on soil temperature at 5 cm depth and soil moisture at 0-10 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.
|
| 关 键 词： | Leymus chinensis steppe ecosystem respiration soil respiration microbial respiration temperature moisture |
| 收稿时间： | 20 December 2005 |
Influencing factors and partitioning of respiration in a <Emphasis Type="Italic">Leymus chinensis</Emphasis> steppe in Xilin River Basin,Inner Mongolia,China |
| |
| Yuanbo?Geng,Guangqiang?Luo.Influencing factors and partitioning of respiration in a Leymus chinensis steppe in Xilin River Basin,Inner Mongolia,China[J].Journal of Geographical Sciences,2011,21(1):163-175. |
| |
| Authors: | Yuanbo Geng Guangqiang Luo |
| |
| Institution: | (1) School of Urban and Environmental Sciences, Northeast Normal University, Jilin, 130024, China;(2) Department of Ecology, College of Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing, 100871, China;(3) Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Jilin, 130024, China;(4) Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan |
| |
| Abstract: | Based 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 Inner Mongolia, China. Soil temperature and moisture were the main factor affecting respiration
rates. Soil temperature can explain most CO2 efflux variations (R
2=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 (R
2=0.314–0.583), but it can not explain much of the variation of microbial respiration (R
2=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 0–10 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. |
| |
| Keywords: | Leymus chinensis steppe ecosystem respiration soil respiration microbial respiration temperature moisture |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
| 点击此处可从《地理学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《地理学报(英文版)》下载免费的PDF全文 |
|
