發(fā)布時(shí)間：2019-06-13 17:39

【摘要】：沿昌都到噶爾縣的經(jīng)度梯度,對(duì)西藏典型高寒草地植被生產(chǎn)力與植物多樣性開展了1 700 km的野外樣帶調(diào)查。實(shí)驗(yàn)結(jié)果表明:高寒草地的群落結(jié)構(gòu)特征(地上生物量、地下生物量、蓋度和密度)與生物多樣性(物種豐富度、物種多樣性和物種均勻度)均具有明顯的經(jīng)度分布格局。整體而言,這些特征參數(shù)均表現(xiàn)出自西向東沿荒漠草原—典型草原—草甸草原呈逐漸遞增的趨勢(shì);其經(jīng)度格局主要受降雨量和平均氣溫所趨動(dòng),但降雨量和平均溫度的影響在不同指標(biāo)間存在較大差異;地上生物量由二者共同決定,而物種豐富度受降雨量的影響更大。西藏高寒草地的物種豐富度與地上生物量間存在顯著的冪指數(shù)關(guān)系(y=0.219 7 x~(0.754 9),R~2=0.61,P0.01)。上述規(guī)律的發(fā)現(xiàn),不僅有利于我們更好地理解高寒草地對(duì)未來氣候變化的響應(yīng)機(jī)制與適應(yīng)途徑,也將幫助我們合理制定放牧策略以實(shí)現(xiàn)該地區(qū)高寒草地的可持續(xù)發(fā)展。
[Abstract]:Based on the longitude gradient from Changdu to Gaer County, the vegetation productivity and plant diversity of typical alpine grassland in Tibet were investigated by 1 700 km field transect. The results showed that the community structure characteristics (above ground biomass, underground biomass, coverage and density) and biodiversity (species richness, species diversity and species evenness) of alpine grassland had obvious longitude distribution pattern. On the whole, these characteristic parameters show a gradual increasing trend from west to east along desert steppe, typical grassland and meadow grassland, and their longitude pattern is mainly driven by rainfall and average temperature, but the influence of rainfall and average temperature is quite different among different indexes. The above ground biomass is determined by both of them, and the species richness is more affected by rainfall. There was a significant power exponential relationship between species richness and aboveground biomass in alpine grassland in Tibet (y 鈮，

本文編號(hào)：2498695