青海扁茎早熟禾地下生物量垂直动态  

Underground Biomass Vertical Dynamic of Poa pratensis var. anceps cv. Qinghai

作　　者：刘文辉[1] 颜红波[1] 周青平[1] 

机构地区：[1]青海省畜牧兽医科学院,青海西宁810016

出　　处：《西北农业学报》2009年第4期233-239,共7页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：科技部"根茎型青海扁茎早熟禾新品种繁育与示范"项目(05EFN216300307);科技部"三江源区根茎型优良牧草原种快速扩繁与栽培技术研究"项目(2005-SN-02);农业部"青藏高原牧草种质资源保护利用项目(070401)";国家科技基础条件平台项目"植物种质资源共享平台建设"(2007DKA21007-14)

摘　　要：在青海高寒地区对生长2 a青海扁茎早熟禾（Poa pratensis var. anceps Gaud. cv. Qinghai）地下垂直动态进行了研究,以探讨其地下垂直分布规律。结果表明：青海扁茎早熟禾主根全部分布于0~5 cm土层中,根茎、毛根、根茎分蘖芽和总生物量均集中分布于0~10 cm土层中。除毛根在返青后半个月时间内地下垂直分布呈＂〉＂型外,根茎生物量、根茎长、根茎分蘖芽数、毛根和地下总生物量垂直分布在一个生长季均呈＂T＂型分布,且符合Y=1-βD变化,但分布数量和比例不同。青海扁茎早熟禾地下与地上生物量呈显著正相关,根冠比0.41。根茎周转率〉毛根周转率〉主根周转率;根茎分蘖芽数周转率〉根茎生物量周转率〉根茎长周转率。The vertical dynamic of underground biomass of the second years＇ Poa pratensis var. anceps cv. Qinghai was studied to disclose the regulation of underground biomass vertical distribution in alpine region, Qinghai province. The results showed that the root of Poa pratensis var. anceps cv. Qinghai mainly is distributed in the soil layer of 0-5 cm. Rhizome, rhizome, capillary root, number of tiller and underground biomass mainly is distributed in the soil layer of 0-10 cm. They displayed a ＂T＂ type distribution presented by Y= 1-β^D function in vertical in all growing period, except capillary root showed ＂〉＂ type distribution in the period of recovering from winter. It is different of quantity and proportion in vertical distribution. The underground biomass was significantly positively correlated with the aboveground biomass. It＇s root shoot ratio is 0.41. The result of turnover rate compared is rhizome＇ s 〉capillary root＇s 〉root＇s, the number of tiller＇s 〉rhizome biomass＇s 〉length of rhizome＇s.

关 键 词：青海扁茎早熟禾 地下生物量 垂直动态 

分 类 号：S812[农业科学—草业科学]