本文選題：典型草原　切入點：嚙齒動物　出處：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：研究不同放牧方式對嚙齒動物及植物群落的影響,可以進一步明確嚙齒動物密度對牧草產(chǎn)量損失的關(guān)系,這對于計算草地危害閾值和經(jīng)濟閾值至關(guān)重要,也可以對草地畜牧業(yè)管理決策提供指導(dǎo)。本研究于2012年-2016年,在錫林郭勒典型草原(東烏珠穆沁旗),應(yīng)用標(biāo)志重捕法和樣方法對嚙齒動物密度以及9月份植物群落特征進行了調(diào)查,用嚙齒動物密度及其日食量來估算嚙齒動物對牧草的損害程度,確定牧草損失量。為了揭示不同放牧方式下嚙齒動物及植物群落的動態(tài)特征,以及它們之間的互相關(guān)系,分析了嚙齒動物群落的物種數(shù)特征與各物種的種群動態(tài);同時分析了典型草原植物群落在不同放牧方式下的年度特征。研究結(jié)果表明:(1)不同放牧方式下嚙齒動物群落的結(jié)構(gòu)組成較為一致,過牧區(qū)的物種數(shù)略高于禁牧區(qū)、輪牧區(qū);在2012年-2016年期間發(fā)生了群落演替的現(xiàn)象。并且不同放牧方式下嚙齒動物捕獲數(shù)量的年度變化差異不顯著,但過牧區(qū)的嚙齒動物數(shù)量變化率明顯高于輪牧區(qū)、禁牧區(qū)。(2)不同放牧方式下植物群落組成基本相似,只有冷蒿(Artemisia frigida)的密度在2013年-2015年出現(xiàn)了明顯降低。而不同放牧方式下植物高度差異不顯著(P0.05),密度、生物量以及牧草損失比均有顯著性差異(P0.05),3種放牧區(qū)中過牧區(qū)的植物高度、密度、生物量以及牧草損失比例均較低,而禁牧區(qū)均較高。(3)嚙齒動物密度與牧草損失量的最佳擬合曲線是三參數(shù)S型曲線,為:Loss=k/(1+ea-rdensity);當(dāng)嚙齒動物密度906標(biāo)準(zhǔn)鼠單位/hm~2時,牧草產(chǎn)量發(fā)生最大損失(牧草產(chǎn)量損失比=23.30%);該類型草地嚙齒動物對牧草損害的危害閾值為每公頃174標(biāo)準(zhǔn)鼠單位。(4)2012年-2016年5年的鼠害平均經(jīng)濟閾值為172標(biāo)準(zhǔn)鼠單位/hm~2。(5)綜合考慮危害閾值與防治閾值可以得出,既不會造成明顯的經(jīng)濟損失,也不會造成牧草發(fā)生明顯損失的閾值范圍為172-174標(biāo)準(zhǔn)鼠單位/hm~2。
[Abstract]:By studying the effects of different grazing methods on rodents and plant communities, the relationship between rodent density and forage yield loss can be further clarified, which is of great importance to the calculation of grassland damage threshold and economic threshold.It can also provide guidance for grassland animal husbandry management decision.In this study, the density of rodents and the characteristics of plant communities in September were investigated in the typical grassland of Xilingol (East Urumqin Banner) from 2012 to 2016.The density of rodents and their daily food intake were used to estimate the damage degree of rodents to forage and to determine the loss of forage.In order to reveal the dynamic characteristics of rodent and plant communities under different grazing patterns and their relationships, the species number characteristics of rodent communities and the population dynamics of various species were analyzed.At the same time, the annual characteristics of typical grassland plant communities under different grazing patterns were analyzed.The results showed that the composition of rodent community under different grazing methods was consistent, and the species number in overgrazing area was slightly higher than that in forbidden grazing area and rotational grazing area, and the community succession occurred from 2012 to 2016.The annual variation of rodent catch number was not significant under different grazing patterns, but the rodent population change rate in overgrazing area was significantly higher than that in rotational grazing area, and the composition of plant community was similar under different grazing modes.The density of Artemisia frigida decreased significantly from 2013 to 2015.However, there was no significant difference in plant height under different grazing patterns (P 0.05), but there were significant differences in plant height, density, biomass and the loss ratio of forage grass in three grazing areas. The plant height, density, biomass and loss ratio of forage grass in three grazing areas were lower than those in other grazing areas.The best fitting curve between rodent density and forage loss is three-parameter S-shaped curve, which is 1 ea-rdensity.When rodent density is 906 standard rat unit / unit / hm ~ 2,The maximum loss of forage yield (forage yield loss ratio is 23.30m; the threshold of damage to forage by rodents of this type is 174 standard rodent units per hectare. 4) the average economic threshold of rodent damage is 172 standard rodent units for the 5 years from 2012 to 2016.The hazard threshold and the prevention threshold can be obtained by considering the hazard threshold and the prevention threshold.The threshold range of significant loss in forage is 172-174 standard rat unit / hmmf2.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：S812.6

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