杉木、柳杉与黄连间作的初步研究

引言林农间作、林药间作等混农林业模式是提高农、林业生态系统功能和生产的有效途径。我国耕地面积小,森林资源不足,因此发展混农林业生产,最大限度地利用林地生产力,提     

Chinese Traditional Bioethics

Chinese traditional bioethics is based on the life origin theory of “Qi (vital force) permeates everything under heaven”, the attitude towards life theory of “loving people” and “loving things”, and the life transcendence theory of “eternity” and “immortality”. The life origin theory answers the question of how life comes into being, which is the basis for exploring the mystery of life. The attitude towards life theory gives answers to the question of how to treat life properly and establishes the basic requirements and criteria for treating life. The life transcendence theory responds to the question of how to make life more meaningful. Those three thoughts support each other and explain each other with the inner logical band between these three basic thoughts, and tentatively offers a reasonable way for the reconstruction of traditional Chinese bioethics, which can be a special theoretical resource for today's bioethical research.     

同域分布中华鬣羚与中华斑羚时空生态位特征

为了解同域分布有蹄类在环境复杂的山地森林生境中以何种方式维持种间关系以实现稳定共存,基于物种分布模型与日活动模式分析了四川省岷山、邛崃、大相岭、小相岭和凉山五大山系同域分布中华鬣羚(Capricornis milneedwardsii)与中华斑羚(Naemorhedus griseus)的时空生态位特征。结果显示:(1)在四川省五大山系,中华鬣羚的适宜栖息地面积为28006.07 km²,占研究区总面积的26.18%,其中高适宜栖息地面积为10015.90 km²,中华斑羚的适宜栖息地面积为21073.32 km²,占研究区总面积的19.71%,其中高适宜栖息地面积为8396.22 km²;(2)中华鬣羚与中华斑羚在生境因子选择上相似性高、栖息地重叠面积大,其空间生态位重叠度指数D=0.776,I=0.949,其适宜栖息地的主要重叠区域位于岷山和邛崃山系;(3)中华鬣羚与中华斑羚的日活动节律重叠指数为0.812;(4)中华鬣羚与中华斑羚属于同域分布的资源利用型竞争物种,中华鬣羚的存在会显著影响中华斑羚的日活动节律(P=0.016);二者同域分布时都会增加其昼间活动强度,并增加活动高峰期的强度及持续时间。本研究初步分析了中华鬣羚与中华斑羚的时空生态位特征,揭示了二者在空间、时间生态位上种群共存及种间竞争的耦合关系。研究有利于深入理解同域分布动物时空生态位特征、近缘物种的共存机制及种间竞争关系,为有蹄类等珍稀野生动物种群及栖息地的保护提供科学参考。     

Chinese crested dog

The Chinese crested dog is devoid of hair except for the crown of the head, lower part of the limbs and tail. The breed is produced by a dominant gene for hypotrichosis (Hr) in combination with the gene for long hair (l). The homozygote HrHr is a prenatal lethal, hence the Chinese crested dog is an obligate heterozygote. The long haired segregants, ++ ll, are known as powderpuffs.     

The Chinese pareiasaurs

Pareiasaurs were important medium‐ to large‐sized herbivores in the Middle and Late Permian, some 268–252 Ma. They are best known from abundant remains of several taxa found in South Africa and Russia, with isolated finds from other parts of the world. Six genera and species of pareiasaurs have been described from China, and yet they have not been reviewed. Of these six, Tsiyuania may be a synonym of Honania, but this taxon is not further considered here. The other four, which were named for separate finds from the Sunjiagou Formation (Changhsingian, 254–252 Ma), show considerable similarities. Despite earlier suggestions, there are no convincing anatomical characters to distinguish Shihtienfenia, Shansisaurus, and Huanghesaurus, and these three genera are synonymized as Shihtienfenia permica Young & Yeh, 1963. The fourth taxon, Sanchuansaurus pygmaeus Gao, 1989, shows distinctly different teeth from those of Huanghesaurus (= Shihtienfenia), and was about one‐third of the size, so it is retained as a second valid pareiasaur from the Chinese latest Permian. Phylogenetic analysis confirms the validity of these two taxa, with Sanchuansaurus belonging among the derived forms, close to Elginiidae, and with Shihtienfenia associated with Pumiliopareiasauria and Pareiasuchus.     

Chinese saline lakes

China has many saline lakes. Most occur in the west and north-east. Four main regions can be distinguished: Qinghai-Tibet Plateau, North western, North-central and Eastern. All types of chemical composition occur, but some regionalization of types is found. The Palaeolimnology of many saline lakes in China has been investigated, and a variety of dating techniques indicate ages between the Quaternary and the Recent. Organisms studied include Artemia, Dunaliella salina and some halophilic bacteria. The important role of organisms in many processes of geochemical and geological interest is stressed. Geoecology, as a combination of geology, mineral deposition and ecology, is a subject worth greater attention.