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塔里木胡杨林保护区塔里木马鹿生境动态及其影响因素分析 被引量:4
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作者 艾尼瓦尔.吐米尔 马合木提.哈力克 《生态科学》 CSCD 2007年第1期63-68,共6页
采用GIS技术,结合实地考察数据和历史数据,通过对信息加工与处理,对1973-2003年间塔里木胡杨林自然保护区马鹿塔里木亚种(Cervus elaphus yarkandensis)分布区的生境动态情况进行了研究,同时对影响塔里木马鹿栖息地变化的主要因素进行... 采用GIS技术,结合实地考察数据和历史数据,通过对信息加工与处理,对1973-2003年间塔里木胡杨林自然保护区马鹿塔里木亚种(Cervus elaphus yarkandensis)分布区的生境动态情况进行了研究,同时对影响塔里木马鹿栖息地变化的主要因素进行了分析。结果表明,自1973-2003年在塔里木胡杨林自然保护区中各种生境类型的变化比较显著,其中(1)水资源严重缺乏,水量剧烈减少,水域面积大幅缩小(2)沙漠面积和低盖度植被面积略有减少,高盖度植被面积减少强烈,保护区内耕地面积快速增加,荒漠化趋势明显,总体上马鹿塔里木亚种分布区的各种生境类型处于变化状态,栖息地环境趋向恶化。 展开更多
关键词 栖息地动态 马鹿塔里木亚种 地理信息系统
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Spatiotemporal dynamics of ecological variation of waterbird habitats in Dongtan area of Chongming Island 被引量:5
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作者 范学忠 张利权 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2012年第3期485-496,共12页
Based on Landsat TM images, we explored the pattern of variation of suitable waterbird habitats from 1990 to 2008 in the Dongtan area of Chongming Island at the Changjiang (Yangtze) River mouth. By applying our highly... Based on Landsat TM images, we explored the pattern of variation of suitable waterbird habitats from 1990 to 2008 in the Dongtan area of Chongming Island at the Changjiang (Yangtze) River mouth. By applying our highly accurate indicator model (R=0.999, P<0.01), we quantified the variations of fluctuation intensity for local waterbird habitats during 1990-2008, and for the main waterbird groups (Anatidae, Charadriidae, Ardeidae and Laridae) from 2006 to 2008, to evaluate the impact of habitat quantity change on the waterbird habitat status and the population dynamics of the different waterbird groups. The results show that the aquaculture ponds (AP) and the Scirpus mariqueter zone (SMZ) underwent drastic habitat changes during certain periods (AP: 1997-2000, 2000-2003, 2005-2008; SMZ: 1997-2000), and the fluctuation intensity differed among habitat types in the order AP>SMZ>TSH (total suitable habitat)>BSA (bare mud flat and shallow water area). The abandonment of tracts of aquaculture ponds in Dongtan in mid-2006 brought about an intensive population fluctuation, caused by rapidly changing habitat with the population expanding to adjacent areas. At present, Anatidae and Ardeidae are threatened in the Dongtan area with declining populations because of their very "picky" habitat requirements (i.e., high reliance on AP). The Charadriidae experienced enormous population declines in the late 1990s, however, they have since recovered to normal levels as habitat change has stabilized. Our findings suggest that the current challenges for habitat management are the protection and stabilization of AP and SMZ habitats. 展开更多
关键词 WATERBIRD BIODIVERSITY habitat management population dynamics nature reserve Chongrning Island Changjiang (Yangtze) River estuary
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Demography and dynamics of mountain nyala Tragelaphus buxtoni in the Bale Mountains National Park,Ethiopia 被引量:1
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作者 Yosef MAMO Michelle A.PINARD Afework BEKELE 《Current Zoology》 SCIE CAS CSCD 北大核心 2010年第6期660-669,共10页
We studied the population dynamics of endangered mountain nyala Tragelaphus buxtoni between 2003-2005 in the Bale Mountains National Park. Line-transect sampling and total count methods were used to gather data on dem... We studied the population dynamics of endangered mountain nyala Tragelaphus buxtoni between 2003-2005 in the Bale Mountains National Park. Line-transect sampling and total count methods were used to gather data on demographics and movement patterns. The population's age-group composition was 58% adults, 25% sub-adults, 9% juveniles, 5% calves and 3% unidentified with a female-male sex ratio of 2:1. Population density was found to be significantly different between the two sub-populations (Dinsho Sanctuary and Gaysay/Adelay). A significant difference was found for age-group composition across the two sub-populations except adult females, sub-adult males and calves. The Dinsho sub-population was an isolated group. Separation and containment of the mountain nyala population could have negatively affected their ability to search for habitat requirements and mates from distant areas. The population varied between 830-908 individuals (95% CI), a reduction of 45% from earlier reports. However, the mean population density increased due to contraction of the species' habitat range. We observed a population decrease of 2%-5% per year over the course of our study. Many of the assessed demographic parameters did not significantly change over the three years. This suggests that the decrease in nyala population was not due to random variations in reproduction. Anthropogenic factors such as competition with livestock for forage, habitat encroachment and poaching by the local people might have been partly responsible for the depleted population in our study areas [Current Zoology 56 (6): 660q569, 2010]. 展开更多
关键词 Density DYNAMICS Group size Mountain nyala MOVEMENT Sex ratio
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基于改进型遥感生态指数的生态系统服务价值评估方法
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作者 魏之首 关燕宁 +7 位作者 蔡丹路 张春燕 姚武韬 廖周伟 邓锐 钱佳琪 夏亦寒 郭杉 《地球信息科学学报》 EI CSCD 北大核心 2024年第7期1763-1778,共16页
本文通过构建遥感生态指数(RSEI)与动态栖息地指数相结合的改进型遥感生态指数(DRSEI)作为时空动态调节因子,对国家公园这种具有丰富物种的自然生态系统服务价值评估方法进行了改进。改进型遥感生态指数(DRSEI)作为时空动态调节因子的... 本文通过构建遥感生态指数(RSEI)与动态栖息地指数相结合的改进型遥感生态指数(DRSEI)作为时空动态调节因子,对国家公园这种具有丰富物种的自然生态系统服务价值评估方法进行了改进。改进型遥感生态指数(DRSEI)作为时空动态调节因子的方法与应用遥感生态指数、净初级生产力指数(NPP)作为时空动态调节因子的方法进行比较分析表明:引入能够表达生态系统生物多样性时空变化特征的动态栖息地指数构建改进型遥感生态指数,由于该指数的空间信息特征更加丰富,且考虑到了区域的生物多样性因子,改进型遥感生态指数(DRSEI)作为时空动态调节因子的生态系统服务价值评估方法可以更加全面客观地反映区域生态系统的结构、功能与过程的时空分异,准确评估生态系统服务时空动态价值,为国家公园生态系统服务价值评估提供了新视角。利用该方法定量评估和分析了武夷山国家公园2017—2021年生态系统服务价值的时空变化状况,2017—2021年武夷山国家公园生态系统服务价值总体呈上升的趋势,呈现较为适当的生态环境保护与资源开发利用状况。 展开更多
关键词 生态系统服务价值 改进型遥感生态指数 时空动态调节因子 遥感动态栖息地指数 武夷山国家公园
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