草业学报2018，Vol.27Issue(1)：62-72,11.DOI:10.11686/cyxb2017040
黄河上游高寒草甸矮嵩草生理特征对流域不同生境的响应
Physiological responses of Kobresia humilis to different habitats in the alpine meadow of the Yellow River
摘要
Abstract
Kobresia humilis is one of the dominant species in the alpine meadow.We analyzed the physiological and ecological characteristics of K.humilis growing in several different habitats in a small catch-pit with secondary tributaries draining into the Yellow River,near Nanqi village,Henan County,Qinghai Province.The habitats were hill top,hill slope,beach land,terrace 1,and terrace 2.We explored the interaction between K.humilis and soil factors in these habitats.Soil analyses showed that soil moisture,total nitrogen,total P2O5,available phosphorus,and organic matter were higher in the terrace 1,terrace 2,beach land,and hill top habitats,and lower on the hill slope.Beach land showed the lowest soil pH and total K2O,and highest available potassium content.Therefore,soil fertility was higher in the terrace 1,terrace 2,and beach land habitats.Because of the different catch-pits in the various habitats,total biomass was higher in the terrace 1,terrace 2,and beach land habitats,and lower in the hill top and hill slope habitats.K.humilis was distributed in every habitat except on the floodplain wetland in terrace 1,and it was the dominant species in the beach land habitat.Its coverage,importance value,biomass,and proportion of total biomass were higher in the beach land habitat than in the hill slope habitat.Catalase activity and the contents of malondialdehyde,soluble protein,soluble sugars,proline,and carotenoids were higher in K.humilis from the hill top,hill slope,and terrace 2 habitats than in K.humilis from other habitats,but the chlorophyll a and b contents were lower.These indexes showed the opposite trends in the beach land habitat.Correlation analyses between soil factors and the physiological characteristics of K.humilis showed that some physiological characteristics were strongly correlated with soil moisture,pH,and total K2O.According to these comprehensive analyses of K.humilis across a range of ecological habitats,we conclude that K.humilis is suited to growth on soil with low pH,and moderate moisture and nutrition status.It can adapt to its habitat by increasing its resistance and competitive abilities under the conditions of low soil moisture and low nutrient content.关键词
高寒草甸/流域/矮嵩草/生理/生境Key words
alpine meadow/catch-pit/Kobresia humilis/physiology/habitats引用本文复制引用
李积兰,李希来,马福俊..黄河上游高寒草甸矮嵩草生理特征对流域不同生境的响应[J].草业学报,2018,27(1):62-72,11.基金项目
国家国际科技合作专项项目(2015DFG31870),国家重点研发计划项目(2016YFC0501903)和青海省科技厅项目(2015-SF-117,2017-HZ-802)资助. （2015DFG31870）
