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荒漠区啮齿动物群落及其优势种对不同干扰的响应机制
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摘要
荒漠区严酷的气候条件以及日益加剧的人为干扰,使荒漠区生态系统变得更加脆弱。啮齿动物在荒漠生态系统中占有重要地位。研究这些地区的啮齿动物群落及其优势种对自然和人为干扰的响应对于理解荒漠区的动物多样性维持机理具有重要意义。2006—2011年在阿拉善典型荒漠区的开垦、禁牧、轮牧和过牧4种不同干扰生境中,分别建立2个固定样地。采用标志重捕法对不同干扰下的啮齿动物群落进行监测。并对气候、土壤和植被进行了同步观测。本研究在分析了不同干扰下荒漠啮齿动物栖息地适宜性的基础上,从优势种群和群落两个方面探讨了啮齿动物对不同干扰的响应。种群方面:分析了不同干扰下啮齿动物群落优势种的数量动态及其存活率;结合气候、土壤和植被因子应用结构方程模型分析了啮齿动物优势种丰富度对干扰的响应机制。群落方面:分析了不同干扰下啮齿动物群落中生活史策略者的组成和群落稳定性;最后应用结构方程分析了啮齿动物群落对干扰的响应机理。结果表明:(1)过牧降低了食物的质量和植物隐蔽。放牧(过牧和轮牧)和开垦降低了啮齿动物的总丰富度,并在不同干扰下形成了以不同优势鼠种为主体的啮齿动物群落(2)过度放牧减少了子午沙鼠(Meriones meridianus)和三趾跳鼠(Dipus sagitta)的丰富度,并延缓了三趾跳鼠年内数量高峰的出现时间。开垦降低了跳鼠(五趾跳鼠Allactaga sibirica和三趾跳鼠)的数量,并提前了子午沙鼠出现数量高峰的时间。(3)禁牧使雌性子午沙鼠存活率高于雄性存活率。人为干扰抑制了雌性子午沙鼠存活率,但提高了雄性子午沙鼠的存活率。五趾跳鼠和三趾跳鼠的存活率不受放牧处理和性别的影响。(4)过牧、禁牧和轮牧区优势鼠种丰富度直接受到来自植物隐蔽的最大影响,而土壤硬度对优势鼠种的间接影响最大。开垦区的子午沙鼠丰富度受草本的直接效应最大,而气候条件对其有最大的间接效应。(5)开垦显著的减少了K—忍耐—慢策略者(KSS)在啮齿动物群落中的优势;放牧降低了KSS与r—杂草—快策略者(rRF)的数量,但对rRF策略者的负效应更为显著。(6)开垦显著降低了啮齿动物群落多样性,降低了啮齿动物群落的抵抗力。虽然放牧并没有对啮齿动物群落多样性产生显著影响,但降低了群落的恢复力。(7)过牧、禁牧和轮牧区啮齿动物群落多样性和动物总数量受到植物隐蔽的直接影响较大,而受到土壤的间接效应较大。影响开垦区啮齿动物群落多样性和动物个体数量的最大直接效应均来自草本,而气候条件对二者的间接效应最大。
Harsh climate conditions and intensive human disturbance made desert ecosystemsextremely vulnerable. Rodents play a crucial role in such an ecosystem. Studies onresponses of desert rodent communities and dominant species to natural and humandisturbances are significant to understand driving mechanisms for desert mammal diversityand ecosystem stability. From2006to2011, a study was conducted at cultivated, grazingexclusion, rotational grazed and over gazed sites to investigate effect of grazing andcultivation on rodent communities in Alashan, Inner Mongolia, China. Two sites wereestablished in each habitat, and rodent communities were monitored using live trappingmethod. Vegetation and climatic information were also recorded for each study site. Theresponses of rodents to disturbances were analyzed in two ways. For dominant species,population dynamics and survival probabilities were measured. Relationships of populationabundance with climate, soil compaction and vegetation data were analyzed usingstructural equation modeling (SEM) to test effects of disturbances on rodent dominantspecies. For communities, stabilities and structures with different bionomic strategies weremeasured in different habitats. Response mechanisms of rodent communities todisturbances were also tested by SEM. The results demonstrated that1) intensive grazingreduced food quality and vegetation cover. Grazing and cultivation reduced totalabundance of rodents,and various dominant species occurred under different disturbances.2) Over grazing reduced the population abundance of Meriones meridianus and Dipussagitta,and delayed D. sagitta population peak. Cultivation reduced population abundancefor jerboas, and advanced population peak for M. meridianus.3) A difference in survivalprobability between male and female M. meridianus was detected in grazing exclusion site.Disturbance promoted survival probability of male M. meridianus, while it restrainedfemales. Survival probabilities of jerboas were not influenced by human disturbances andgender difference.4) In non-cultivated sites,including over grazed, grazing exclusion androtational grazed sites,the vegetation shield offered the maximum direct effect ondominant rodents, but indirect effect was largely from soil compaction. Dominant speciesin cultivated sites received more negative effects directly from grasses/forbs, but itreceived more negative effects indirectly from climatic conditions.5)Cultivation decreasedK-Stress-tolerant-Slow (KSS) strategists. Grazing suppressed both KSS and r-Ruderal-Fast(rRF) strategists, and had more negative influence on rRF strategists than any other treatments.6) A significant reduction of rodent community diversity found in cultivatedsites, while community diversity did not significantly differ among over grazed, grazingexclusion and rotationally grazed sites. Cultivation and grazing respectively restrainedcommunity resistance and resilience.7) In non-cultivated sites, including over grazed,grazing exclusion and rotationally grazed sites,both rodent community diversity and totalabundance were influenced by vegetation shield directly, but it was affected by soilcompaction indirectly. In cultivated sites, grasses/forbs had more negative effects on rodentcommunity diversity and total abundance directly than any other factors, while climaticconditions contributed more indirectly on rodent community diversity and total abundance.
引文
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