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湖北省不同地貌类型城市农地城市流转驱动机制比较研究 总被引：2，自引：1，他引：1
协调好经济发展和农地保护的矛盾是实现我国社会经济可持续发展战略的重要基础,农地城市流转是这一矛盾的焦点。农地城市流转在不同地貌类型城市中具有不同的特征。本文从影响农地城市流转的社会经济因素出发,应用1999年～2004年湖北省数据分析了不同地貌类型城市农地城市流转的驱动机制。研究表明,影响因子本身及其影响系数在不同地貌类型城市发生不同程度的变化。其中,固定资产投资、GDP和产业结构升级对湖北省平原城市农地城市流转的影响最明显,固定资产投资、GDP和人均耕地面积对湖北省丘陵城市农地城市流转的影响最明显,城乡居民收入差距、GDP和总人口对湖北省山地城市农地城市流转的影响最明显,各个影响因素对不同地貌类型农地城市流转的推动方向也不完全相同。 相似文献
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《Endeavour》2022,46(3):100812
Hugh Diamond was a psychiatrist, antiquarian, and photographer, who was the first person to take photographs of female asylum patients. These photographs, using the newly invented technology of the camera, were intended to be objective and accurate visual indicators of mental illness. Considering Diamond’s overlapping interests, his project must be understood within the larger cultural and historical context and the tensions inherent in medical photography and portraiture. Despite the goal of capturing “objective, scientific data,” the photographs instead relied on traditional iconography dating back to the Greeks and Middle Ages and can be analyzed from an art historical perspective. As an antiquarian, Diamond collected portraits of his patients just as he collected various other objects. As such, while Diamond may be considered a humanistic leader of the moral treatment movement, his work in capturing these “specimens,” the female patients, reflects a perpetuation of the stigmatization of mental illness to be put on display for the Victorian audience. 相似文献
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The present paper deals with a collection of plant fossils from the Wu-
yun Group of Heilongjiang Province. These fossils belong to 28 families, 39 genera
and 53 species. The flora is composed of 7 species of pteridophytes, 8 of conifers and 37
of angiosperms. All have been fully described, of which ten are new species.
Most elements of this flora are subtropic or warm-temperate, with only a few of
them are temperate ones. The flora consists of conifers and broad-leaved trees adapted
to humid warm-temperate or subtropic climate.
With the physiognomy of leaves, 40 per cent of them are of entire margin, and most
are medium-sized, with some megaphyllous. The nervation is mostly palmate. These
characters indicate that the climate was warm-temperate or subtropic.
Among 35 genera known from the Late Cretaceous of East Asia, 27 are also found
in North America, which indicates that the floristic relationship between East Asia and
North Americal was closer at that time than it is now. Therefore the number of
genera in common has been decreasing through the age, because these two regions have
been detached from each other since the late Eocene, as a result of continental drift.
Only some relic forms left on both sides, and only 4.1% of genera are common to both
continents. After the early Tertiary the floras of East Asia and North America have
been developing independently.
The Chinese flora of the Late Cretaceous may be divided into three Zones from the
north to the south: (1) warm temperate-subtropic zone, rich in Metasequoia, Ginkgo,
Trochodendroides, Platanus, Trochodendron, Protophyllum, Ampelopsis Pterospermites
and Menispermites; (2) subtropic or dry subtropic transitional zone; and (3) subtropic-
tropic zone, rich in Brachyphyllum, Cinnamomum, Nectandra and Palms.
The Wuyun flora is considered closely related to the Chajiayang Group and Sikhote-
Alin flora of USSR, with 15 genera in common and also related to the Kuji flora of
Japan (Cenonian), with 11 genera in common. It is interesting to note that 11 genera
are also found in North America (Canada and Alaska) of the Late Cretaceous. The pa-
lynological assemblage of the Wuyun flora is closely related to Minshui flora of the So-
uliao Basin, 15 genera being common to the both. Seventy per cent of megafossils of
the Wuyun flora have become extinct, which seems to show that the age of the flora is
older than Paleocene and is assigned to the Latest Late Crataceous (Maestrichtian-Dani-an). 相似文献
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