草业学报2013，Vol.22Issue(2)：22-29,8.
呼伦贝尔草甸草原土壤呼吸及其影响因子对不同放牧强度的响应
Soil respiration of Hulunber meadow steppe and response of its controlling factors to different grazing intensities
摘要
Abstract
From June to September in 2010, soil respiration was measured at six different grazing intensities in experimental plots in Hulunber meadow steppe using a LI-6400-09 Soil Chamber to understand the influence of different grazing intensities on soil respiration of grassland. The controlling factors of soil respiration were taken into account under different grazing intensities. 1) Soil water content, root biomass, above ground bio-mass, and litter accumulation decreased with an increase of grazing intensity. However, soil temperature had an irregular change pattern with an increase of grazing intensity. 2) The dynamic changes in soil respiration rate have a double peak curve from different grazing intensities during the whole experimental period, while the varied mode of the mean value of soil respiration rate can be expressed as R1>R0>R2>R3>R4>R5. There was no significant difference between R0 and R1. The soil respiration rate was higher in R0 and R1 treatments than in the R5 treatment except on September 30th. Soil respiration rate was dramatically influenced by grazing intensity, with a more intense response under the R4 and R5 grazing intensities. 3) The effect of grazing intens-iy on soil respiration changed with variation of grazing season or date showing there was an interaction between them. The partial correlation of time analysis has shown that soil temperature, soil water content, root biomass, above ground biomass, litter accumulation had significantly positive correlations with soil respiration under different grazing intensities but there was a significantly negative correlation with grazing intensities. The lower grazing intensity (R1) had no adverse effect on soil respiration rate and its controlling factors, while the higher grazing intensities (R4 and R5) have obviously influenced them.关键词
草甸草原/土壤呼吸/影响因子/放牧强度/呼伦贝尔Key words
meadow steppe/ soil respiration/ controlled factors/ grazing intensities/ Hulunber分类
农业科技引用本文复制引用
邓钰,柳小妮,闫瑞瑞,王旭,杨桂霞,任正超,辛晓平..呼伦贝尔草甸草原土壤呼吸及其影响因子对不同放牧强度的响应[J].草业学报,2013,22(2):22-29,8.基金项目
内蒙古自治区重大科技项目(20091403),国家973项目(2010CB833502),公益性行业(农业)科研专项(201003019,201003061,200903060),现代农业产业技术体系建设专项和国家自然基金(30960264)资助. （20091403）
