本文選題：載畜率　切入點：物種組成　出處：《西北植物學(xué)報》2017年11期 　論文類型：期刊論文

【摘要】：以內(nèi)蒙古四子王旗短花針茅(Stipa breviflora)荒漠草原為研究對象,從植物個體尺度入手,通過2016年野外群落調(diào)查試驗,對荒漠草原不同放牧處理[載畜率分別為0(CK)、0.91(LG)、1.82(MG)、2.71(HG)羊/(hm2·a-1)]下的物種組成、植物多樣性與生產(chǎn)力的關(guān)系進行分析,以揭示荒漠草原群落中的物種組成、物種多樣性及其功能群多樣性對不同載畜率的響應(yīng)機制。結(jié)果表明:(1)對照區(qū)的植物種最多,有13科30種,輕度放牧區(qū)只比對照區(qū)少野韭(Allium ramosum)1種植物,而中度放牧區(qū)和重度放牧區(qū)的植物種分別較對照區(qū)減少了30%和40%,其中減少的物種大多屬于多年生雜類草與多年生根莖禾草兩大功能群。(2)多年生叢生禾草在植物群落中占比始終最大(29%~78%),且隨著載畜率的增加而增加,而其他功能群均隨載畜率增加呈減小的趨勢。(3)兩種多樣性指數(shù)中,除了功能群多樣性的Margalef豐富度指數(shù),其他多樣性指數(shù)均在對照區(qū)達(dá)到最大值,且大小依次為對照輕度中度重度放牧區(qū)。(4)物種多樣性的3個α多樣性指數(shù)與草地生產(chǎn)力存在顯著正相關(guān)關(guān)系,功能群多樣性指數(shù)則與生產(chǎn)力無相關(guān)關(guān)系。研究認(rèn)為,長期放牧使得荒漠草原群落結(jié)構(gòu)趨于簡單化,使多年生叢生禾草形成優(yōu)勢單種;且載畜率的增加使得短花針茅荒漠草原植物的多樣性及生產(chǎn)力均顯著下降,高水平的多樣性會導(dǎo)致高水平的草地生產(chǎn)力,比較2種多樣性指數(shù)指標(biāo),物種多樣性指標(biāo)對荒漠草原生產(chǎn)力的貢獻更大。
[Abstract]:The species composition of desert steppe of Stipa breviflora, Siziwang Banner, Inner Mongolia, was studied on the basis of plant individual scale and field community investigation in 2016. The relationship between plant diversity and productivity was analyzed to reveal the response mechanism of species composition, species diversity and functional group diversity to different stocking rates in desert steppe communities. There are 30 species belonging to 13 families and only Allium ramosum)1 species in light herding area. In moderate grazing area and heavy grazing area, the plant species decreased by 30% and 40, respectively, in which most of the decreased species belonged to two major functional groups of perennial hybrid grass and perennial rhizomatous grass. The percentage in the middle of the fall was always the largest, 29% and 78%, and increased with the increase of the stocking rate. However, the other functional groups showed a decreasing trend with the increase of stocking rate. Among the two diversity indices, except the Margalef richness index of functional group diversity, the other diversity indices reached the maximum in the control area. The three 偽 -diversity indices of species diversity were positively correlated with grassland productivity, while the functional group diversity index had no correlation with productivity. The community structure of desert steppe tended to be simplified by long-term grazing, which resulted in the formation of dominant single species of perennial herbage, and the increase of stocking rate significantly reduced the diversity and productivity of the desert steppe of Stipa breviflora. High level of diversity will lead to high level of grassland productivity. Compared with two indexes of diversity, the index of species diversity contributes more to the productivity of desert steppe.
【作者單位】： 內(nèi)蒙古農(nóng)業(yè)大學(xué)草原與資源環(huán)境學(xué)院草地資源教育部重點實驗室;
【基金】：國家自然科學(xué)基金(31560140,31260124) 內(nèi)蒙古科技重大專項項目 “西部之光”人才培養(yǎng)計劃 國家重點研發(fā)計劃(2016YFC0500500)
【分類號】：S812

【相似文獻】

相關(guān)期刊論文 前10條

1 周蕓蕓;趙敏杰;李熙萌;馬帥;馮金朝;;大坂山不同海拔高寒植被物種多樣性研究[J];安徽農(nóng)業(yè)科學(xué);2011年13期

2 金深遜;馬曉寧;戴q，

本文編號：1634493