高寒草甸生长盛期CO2交换特征对欧拉羊短期放牧的响应

doi:10.11686/cyxb2016168

摘要/Abstract

摘要： 以甘肃玛曲试验站的高寒草甸为研究区域,2014年8月采用LI-8150土壤碳通量观测系统和LED灯模拟饱和光合潜力,观测对照、轻牧、重牧3个放牧梯度下的生态系统潜在净生产力(potential net ecosystem productivity,NEP_pot)及生态系统呼吸(ecosystem respiration,Re)。结果表明,1)对照、轻牧、重牧3个处理的NEP_pot日变化均呈先升高后降低的变化特征,且不同时间NEP_pot大小均呈现出对照>轻牧>重牧(P>0.05);Re及总初级生产力(potential gross primary productivity,GPP_pot)有相似的变化特征;2) 8月的NEP_pot、Re、GPP_pot出现逐旬降低的变化趋势;3) 8月底,轻牧、重牧组地上生物量分别比对照组低24.88%、47.69%(P<0.05);4)地上生物量对放牧响应的敏感性均大于GPP_pot、NEP_pot及Re(P<0.001),NEP_pot、Re、GPP_pot与日均温呈正相关(P≤0.001),与5 cm土壤湿度呈负相关(P<0.01)。因此,随放牧强度的增加,地上生物量的减少,高寒草甸生态系统NEP_pot、Re、GPP_pot逐渐降低。

Abstract: The aim of this study was to evaluate the effects of grazing on ecosystem respiration and productivity in a meadow grassland on the Qinghai-Tibetan Plateau. We used an LI-8150 Automated Soil CO₂ Flux System and a LED light system to simulate maximum photosynthetic active radiation, and measured ecosystem respiration (Re) and potential net ecosystem productivity (NEP_pot) under three grazing treatments (no grazing, light, and heavy grazing) in a meadow grassland of Maqu County, Gansu Province, on the Qinghai-Tibetan Plateau in August 2014. The results can be summarized as follows: 1) The diurnal NEP_pot peaked at noon in all three treatments, and increased with decreasing grazing intensity (P>0.05). The Re and potential gross primary productivity (GPP_pot) showed similar patterns; 2) The NEP_pot, Re, and GPP_pot decreased from early to middle to late August under all of the different grazing rates during the study period; 3) The aboveground biomass in the light and heavy grazing treatments was significantly reduced by 24.88% and 47.69%, respectively, as compared with the no-grazing treatment in late August; 4) Aboveground biomass was more sensitive to grazing than were GPP_pot, NEP_pot, and Re (P<0.001). NEP_pot, Re, and GPP_pot were significantly positively correlated with average temperature (P<0.001) and significantly negatively correlated with soil moisture at 5 cm depth (P<0.001). Consequently, the NEP_pot, Re, and GPP_pot gradually decreased with increasing grazing intensity and decreasing aboveground biomass.

李亚婷, 宜树华, 侯扶江, 常生华, 王召锋, 秦彧, 陈建军. 高寒草甸生长盛期CO₂交换特征对欧拉羊短期放牧的响应[J]. 草业学报, 2017, 26(4): 24-32.

LI Ya-Ting, YI Shu-Hua, HOU Fu-Jiang, CHANG Sheng-Hua, WANG Zhao-Feng, QIN Yu, CHEN Jian-Jun. Response of CO₂ exchanges to short-term grazing by Euler’s sheep in an alpine meadow in the peak of the growing season[J]. Acta Prataculturae Sinica, 2017, 26(4): 24-32.

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高寒草甸生长盛期CO₂交换特征对欧拉羊短期放牧的响应

Response of CO₂ exchanges to short-term grazing by Euler’s sheep in an alpine meadow in the peak of the growing season

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