一、引言评价野生动物资源是否丰富,必须有质和量两个尺度,质就是种类是否多样,其在保持生态平衡,科研、文化、美学、观赏、基因保存等方面有多大价值,在这一点上,云南无愧于“动物王国”的美称。而量则指每一种动物的数量。“云南的动物种类多,而每一种动物的数量少。”长期以来,人们只有这种模糊的概念,少到多少?其消长变化如何?没有确定的量。 1984年,云南省科委和林业厅组织了猕猴资源考察队,他们克服了难度大、时间紧、调查范围广及经费不足的困难,对全省的猕猴等动物的数量进行了普查,首次获得了猕猴资源量上的数据 ...
李纯, 胡继旋
doaj
[Dynamic Microbial Shifts and Functional Analysis of Saliva Microbial Communities with Caries Children]. [PDF]
Wang Y, Zhang J, Ling ZX, Deng SL.
europepmc +1 more source
我国南方土地退化的形成是由其生态环境的脆弱性决定的。土地退化不仅表现为土壤退化,还表现为植被退化和土地状况恶化,具有明显的坡面分带性。从50年代到80年代,不同人类活动地区土地退化变化的特点不同。土地退化的动态变化主要是由于土地的开垦及人类活动对植被的破坏。土地退化严重的地区既不是人口较少和经济落后的基岩山区,也不是人口较密、经济发达的低丘岗地区,而是人口增长较快、经济较落后的低山丘陵区。
卢金发
doaj
[Dynamic changes in gut microbiota from 1 to 12 months of age in preterm infants]. [PDF]
Song QY, Zhao XL, Ding BL, Lyu Q, Ma LY.
europepmc +1 more source
[Impact of key indicator dynamic change on 90-day prognosis for patients with acute-on-chronic liver failure]. [PDF]
Wang WL +5 more
europepmc +1 more source
[Non-invasive assessment of liver fibrosis: prioritizing dynamic monitoring and expanding population screening]. [PDF]
Lai PP, Chen SY, Sun YM, You H.
europepmc +1 more source
[Predictive role of dynamic changes in liver stiffness measurement for liver-related endpoint events in chronic hepatitis B]. [PDF]
Sun CL +10 more
europepmc +1 more source
Dynamic changes in physiochemical, structural, and flavor characteristics of ginger-juice milk curd. [PDF]
Pan H, Bao W, Chen Y, Liao H.
europepmc +1 more source
[Dynamic changes in genetic mutations in myelodysplastic neoplasms with progressive disease and leukemic transformation]. [PDF]
Yan X +6 more
europepmc +1 more source
[Changes in circulating levels of calcium and bone metabolism biochemical markers in patients receiving denosumab treatment]. [PDF]
Chen Y +8 more
europepmc +1 more source

