KS3 Geography 人口与聚落 迁移 考点精讲
人口地理是 KS3 地理(英国初中阶段,Year 7 至 Year 9)的重要板块。学生需要掌握人口分布与密度、人口增长、年龄结构、人口迁移,以及聚落从村庄到城市的演变规律。本篇文章按考纲知识点逐条梳理,中英对照,配合数据、公式和案例,帮助初中生系统复习并从容应对校内测评。
Population and settlement is a core topic in KS3 Geography, taught between Year 7 and Year 9. You need to understand how people are distributed across the world, why populations grow or shrink, how age structures change, why people migrate, and how settlements develop from hamlets into large cities. This article covers the key knowledge points in Chinese and English, with data, formulas and case studies you can use in class tests and homework.
1. 人口分布与密度 Population Distribution and Density
人口分布(population distribution)描述人口在地球表面的空间分布状况。人口密度(population density)衡量单位面积上居住的人数,计算公式为:人口密度 = 人口总数 ÷ 土地面积,常用单位是"人/平方公里"。全球人口分布极不均匀:亚洲东部、南亚和欧洲西部人口稠密,而极地、热带沙漠、高山和赤道雨林地区人口稀少。亚洲集中了全球约 60% 的人口,但亚洲的沙漠和高原又几乎无人居住,所以不能只说"亚洲人多",要用密度数据说明差异。
Population distribution describes where people live across the Earth's surface. Population density measures how many people live in a given area, calculated as density = total population ÷ land area, usually expressed in people per km². The world's population is spread very unevenly: East Asia, South Asia and Western Europe are densely populated, while polar regions, hot deserts, high mountains and equatorial rainforests are sparsely populated. Asia holds about 60% of the world's people, yet large parts of Asia are empty desert or plateau, so always quote density figures instead of making vague statements.
影响分布的因素分为自然和人文两类。自然因素包括地形、气候、水源与土壤:平原比高山更适宜居住,温和湿润的气候比极端气候更吸引人,靠近河流的地区水源充足,肥沃的土壤有利于农业。人文因素包括经济发展水平、交通与就业机会:沿海平原与城市经济发达、岗位多,人口因此集中。英国平均人口密度约 279 人/平方公里,但英格兰东南部远高于苏格兰高地;中国人口主要分布在"胡焕庸线"以东约 43% 的国土上,这条线至今仍是人口分布的重要分界。
Two groups of factors control distribution. Physical factors include relief, climate, water supply and soil: lowland plains are easier to live on than high mountains, temperate climates attract more people than extreme ones, river valleys supply fresh water, and fertile soil supports farming. Human factors include economic development, transport and jobs, so coastal plains and cities with strong economies become crowded. The UK averages about 279 people per km², but the South East is far more crowded than the Scottish Highlands. In China, most people live east of the Hu Line, on roughly 43% of the national territory, and this line still marks a striking contrast in population density.
典型计算题:某城市人口 120 万,面积 300 平方公里,人口密度是多少?解答:先把 120 万写成 1,200,000,再除以 300,得到 4,000 人/平方公里。答题时务必写单位,并注意"万"与具体数字之间的换算,这是 KS3 数据题的常见失分点。
Worked example: A city has 1.2 million people living in an area of 300 km². What is its population density? Convert 1.2 million to 1,200,000, then divide by 300, giving 4,000 people per km². Always state the unit in your answer and be careful converting between words like million and figures; unit errors are one of the most common marks lost in KS3 data questions.
2. 人口增长 Population Growth
人口增长由出生率(birth rate)与死亡率(death rate)之差决定。出生率指每千人口中每年的出生人数,死亡率指每千人口中每年的死亡人数,自然增长率(natural increase)等于出生率减死亡率。出生率高于死亡率时人口增加,反之人口减少。英国 2022 年出生率约 10.1‰,死亡率约 9.1‰,自然增长率仅约 1‰,人口接近零增长;而尼日尔出生率约 45‰、死亡率约 13‰,自然增长率超过 30‰,人口迅速翻倍。
Population growth depends on the balance between the birth rate and the death rate. The birth rate is the number of live births per 1,000 people per year, the death rate is the number of deaths per 1,000 people per year, and natural increase equals the birth rate minus the death rate. When births exceed deaths the population grows; when deaths exceed births it shrinks. In 2022 the UK birth rate was about 10.1 per 1,000 and the death rate about 9.1 per 1,000, so natural increase was only around 1 per 1,000, close to zero growth. In Niger, by contrast, the birth rate is about 45 per 1,000 and the death rate about 13 per 1,000, so the population grows fast enough to double in a generation.
影响出生率的因素包括教育普及、女性就业率、医疗水平、宗教文化观念和政府政策;影响死亡率的主要是医疗进步、营养改善、清洁饮用水和卫生设施。英国自 18 世纪工业革命后死亡率率先下降,出生率随后降低,这一先后顺序被称为人口转型(demographic transition),一般分为四个阶段:阶段一高出生高死亡,人口稳定;阶段二高出生低死亡,人口爆炸式增长;阶段三出生率开始下降;阶段四低出生低死亡,人口趋于稳定甚至减少。考题常给出一组国家数据,要求判断各国处于哪个阶段,判断依据是出生率与死亡率的具体数值差距。
Birth rates are influenced by education, female employment, healthcare, religious and cultural values, and government policy. Death rates mainly fall when medicine improves, nutrition gets better, and clean water and sanitation spread. In the UK the death rate began to fall during the 18th-century Industrial Revolution and the birth rate dropped later; this sequence is called the demographic transition model. It has four stages: high birth and death rates in stage 1, a high birth rate with a falling death rate in stage 2 when growth explodes, a falling birth rate in stage 3, and low birth and death rates in stage 4 when the population stabilises or declines. Exams often give you data for several countries and ask which stage each one is in; judge by the gap between the birth rate and the death rate.
3. 年龄结构与人口金字塔 Age Structure and Population Pyramids
人口金字塔(population pyramid)用左右对称的条形图展示一个地区各年龄段男女人口所占比例,是 KS3 必考图表。塔底宽大、年轻人口多的金字塔代表快速增长型人口,常见于低收入国家;塔身接近垂直、各层宽度相近的代表稳定型人口,如英国;塔底窄、塔顶宽的代表老龄化收缩型人口。依赖比(dependency ratio)指 0 至 14 岁儿童与 65 岁以上老人之和除以 15 至 64 岁劳动人口,比值高说明每个劳动者需要抚养更多人,政府要投入更多教育和养老资金。
A population pyramid uses paired horizontal bars to show the percentage of males and females in each age group, and it is a compulsory skill in KS3. A wide base with many young people shows a rapidly growing population, typical of lower-income countries. Nearly vertical sides of similar width show a stable population, like the UK. A narrow base with a wider top shows an ageing, shrinking population. The dependency ratio compares people aged 0 to 14 and those over 65 with the working-age population aged 15 to 64. A high ratio means each worker supports more dependants, forcing the government to spend more on schools or pensions.
读金字塔的步骤:第一步看塔底宽度判断青少年比例;第二步看塔身中段判断劳动年龄人口;第三步看塔顶判断老年人口;第四步把形状与国家发展水平联系起来,预测未来的需求,例如学额、医院和养老院。英国人口老龄化明显,2022 年约 19% 的人口超过 65 岁,给国民医疗体系 NHS 和养老金带来压力;尼日尔超过一半人口在 18 岁以下,未来需要大量学校和就业岗位。答题时要用数据支撑结论,例如"塔底占 40%,说明青少年比例高"。
How to read a pyramid: first look at the width of the base for the share of young people, then the middle bars for the working-age population, then the top for the elderly, and finally link the shape to the country's development level to predict future needs such as school places, hospitals and care homes. The UK population is ageing rapidly, with about 19% of people over 65 in 2022, which strains the NHS and the pension system. In Niger more than half the population is under 18, so the country will need many more schools and jobs. Always support your conclusions with figures, for example stating that the wide base shows a high proportion of children.
4. 迁移 Migration
迁移(migration)指人们长期移居到另一个地方。按国界可分为国内迁移(internal migration)与国际迁移(international migration);按意愿可分为自愿迁移(voluntary migration)与被迫迁移(forced migration),难民(refugee)是因战争、迫害或灾害被迫离开家园的人。解释迁移最常用推拉理论(push-pull model):迁出地的推力包括失业、低工资、战争、自然灾害和土地短缺;迁入地的拉力包括就业机会、高收入、好学校、医疗条件和安全自由。
Migration is the long-term movement of people from one place to another. It can be internal, within a single country, or international, across borders. It can also be voluntary or forced: a refugee is someone forced to leave home because of war, persecution or disaster. The push-pull model explains why people move. Push factors in the area of origin include unemployment, low wages, war, natural disasters and land shortage. Pull factors in the destination include jobs, higher pay, good schools, healthcare, safety and freedom.
典型案例:英国国内迁移中,退休老人常从大城市迁往沿海地区养老,年轻人则迁往伦敦等就业中心;这种"老人去海边、年轻人进城"的对比常被用于考试。中国大规模乡城迁移(rural-urban migration)使数亿农民工进入珠三角、长三角的工厂与工地,为城市提供廉价劳动力并汇款回乡,但城市出现住房与学位紧张,乡村则流失最年轻、最有技能的劳动力,即人才流失(brain drain)。写迁移影响时务必分迁出地与迁入地两面:迁出地劳动力减少、老龄化加重,但汇款增加;迁入地劳动力充足、经济增长,但住房、交通与公共服务承压。
Case studies matter. In the UK, retired people often move from big cities to the coast, while young adults move to London and other job centres, a pattern examiners love to test. In China, large-scale rural-urban migration has moved hundreds of millions of workers into factories and construction sites in the Pearl River and Yangtze River Deltas. They supply cheap labour to the cities and send money home to their villages, but cities face housing and school-place shortages, while villages lose their youngest and most skilled workers, a process called brain drain. When writing about the impacts of migration, always cover both sides: the origin loses labour and ages faster but receives remittances, while the destination gains workers and economic growth but must cope with housing, transport and public service pressure.
5. 聚落与聚落类型 Settlements and Settlement Patterns
聚落(settlement)是人类居住和从事活动的场所,分为乡村聚落与城市聚落。选址受两方面影响:site 指具体地点条件,如水源、地势平坦程度、防御地形; situation 指相对位置,如与河流、港口、公路和矿藏的关系。早期聚落多建于河流交汇处,因为需要饮用水、灌溉与运输;山丘顶部则因易守难攻被选作城堡城镇。答题时先判断题目问的是 site 还是 situation,再用关键词作答,避免混淆。
A settlement is a place where people live and work, and settlements are grouped into rural settlements, such as villages and hamlets, and urban settlements, such as towns and cities. Where a settlement is built depends on its site and its situation. The site is the actual land, for example a river crossing, flat ground or a defensive hill. The situation is the position relative to other features, such as rivers, ports, roads and mineral deposits. Early settlements grew at river confluences for drinking water, irrigation and transport, while hilltops were chosen because they were easy to defend. Read the question carefully: site questions ask about the land itself, situation questions ask about the location in relation to the wider area.
乡村聚落形态主要有三种:团状(nucleated)房屋集中在一个中心四周,常见于低地肥沃区;带状(linear)沿河流、道路或山谷延伸;散居(dispersed)房屋彼此远离,常见于山地牧场。聚落的功能包括市场、港口、工业、行政、旅游与居住,多数城市是复合功能。聚落等级(hierarchy)由低到高为小村 hamlet、村庄 village、城镇 town、城市 city:等级越高人口越多,提供的服务种类越全,服务范围越大,但数量越少。人们愿意为医院、大学等高级服务走很远,却只为便利店等日常服务走短距离,这一原则叫服务阈值与服务范围。
Rural settlement patterns come in three main shapes: nucleated settlements have houses clustered around a centre, common on fertile lowland; linear settlements stretch along a road, river or valley; dispersed settlements have scattered farmsteads, typical of upland pasture. Settlements perform functions such as market, port, industrial, administrative, tourist and residential, and most cities combine several functions. The settlement hierarchy runs from hamlet, village and town up to city. Higher-order settlements have more people, a wider range of services and a larger sphere of influence, but there are fewer of them. People will travel a long way for rare high-order services such as a hospital or university, but only a short distance for everyday needs such as a corner shop, which is the idea of threshold population and service range.
6. 城市化与城市土地利用 Urbanisation and Urban Land Use
城市化(urbanisation)指城市人口占总人口比例不断上升、城市地域持续扩大的过程。英国在 19 世纪工业革命期间率先快速城市化,如今约 84% 的人口住在城市;中国城市化率从 1978 年的约 18% 升至 2023 年的约 66%。城市化主要由乡城迁移与城市自然增长共同推动。城市内部土地利用常呈同心圆状:市中心为中央商务区 CBD,集中商店、写字楼与银行,地价最高、建筑最高;向外是内城(inner city),分布旧工厂与老住宅,常需更新改造;再向外是郊区(suburb),独栋住宅带花园,环境安静,地价相对较低。
Urbanisation is the rising share of a country's population living in towns and cities, together with the physical growth of urban areas. Britain urbanised rapidly during the 19th-century Industrial Revolution, and about 84% of its people now live in cities. China's urbanisation rate climbed from about 18% in 1978 to about 66% in 2023. Urbanisation is driven by rural-urban migration plus natural increase inside cities. Land use inside a city often follows a concentric pattern: the central business district, or CBD, sits at the centre with shops, offices and banks, the highest land values and the tallest buildings; the inner city around it holds older factories and terraced housing that often need regeneration; and the suburbs beyond contain houses with gardens, quieter streets and lower land prices.
快速城市化带来城市问题:住房短缺与贫民窟、交通拥堵、空气污染、垃圾处理压力与犯罪率上升。建设可持续城市(sustainable city)是主要对策:发展地铁与快速公交、增加绿地与步行区、推广节能建筑、垃圾分类回收、治理河道。伦敦征收拥堵费(congestion charge)以减少市中心车流,新加坡采用电子道路收费 ERP,新加坡还严格限制私家车数量,这些都可作为案例。答城市问题题按四要素展开:现象、原因、后果、对策,条理清晰才能拿全分数。
Rapid urbanisation creates problems: housing shortages and informal settlements, traffic congestion, air pollution, waste disposal pressure and rising crime. The main response is to build sustainable cities with metro systems and bus rapid transit, more green space and pedestrian zones, energy-efficient buildings, waste sorting and river clean-ups. London introduced the congestion charge to cut traffic in the centre, while Singapore uses electronic road pricing and strictly limits private car ownership; both are useful case studies. Structure every urban problems answer in four parts: the problem, its cause, its consequence and the solution, and you will cover all the marks on the mark scheme.
7. 关键术语与答题技巧 Key Terms and Exam Skills
高频术语默写清单:population distribution 人口分布;population density 人口密度;birth rate 出生率;death rate 死亡率;natural increase 自然增长;migration 迁移;push factor 推力;pull factor 拉力;refugee 难民;urbanisation 城市化;settlement hierarchy 聚落等级;central business district 中央商务区。这些词既是选择题考点,也是问答题的得分关键词,拼写错误会直接扣分,建议抄写三遍再默写一遍。
Revision checklist of key terms: population distribution, population density, birth rate, death rate, natural increase, migration, push factor, pull factor, refugee, urbanisation, settlement hierarchy and central business district. These words appear in multiple-choice questions and are the credit keywords in extended answers, so spelling them correctly matters; write each one three times, then test yourself from memory.
考试常见命令词:describe 描述,写出你在图或数据中看到的变化,例如"人口持续上升";explain 解释,给出原因,用 because 把原因和结果连起来;compare 比较,两边都要写并指出异同;evaluate 评价,先写正反两面再下结论。数据题先看单位和坐标轴再计算;图表题先看图例;地图题先看比例尺和方向。最后留五分钟检查:单位有没有写,术语拼写对不对,案例地名人名是否准确。
Know your command words. Describe means state what you can see in a graph or map, for example that the population rises steadily. Explain means give reasons, linking cause and effect with because. Compare means write about both sides and identify similarities and differences. Evaluate means argue both for and against and reach a conclusion. In data questions, check the units and axes before calculating; in map questions, check the scale and direction first. Always keep five minutes at the end to check your units, your spelling of key terms and the accuracy of your place names.
小结:人口与聚落这一章的关键在于把概念、数据与案例三者结合。每个知识点都要能回答三个问题:它是什么(定义)、为什么(原因与因素)、有什么影响(后果与对策)。把本文的公式、金字塔读法、推拉理论框架和城市问题四要素背熟,再配合真题练习,KS3 地理测评就能稳步拿高分。
Summary: the secret to the population and settlement topic is linking concepts, data and case studies together. For every knowledge point you should be able to answer three questions: what is it, why does it happen, and what are the impacts. Master the density formula, the pyramid reading steps, the push-pull framework and the four-part urban problems structure from this article, then practise with real past questions, and your KS3 Geography assessments will steadily improve.
CASIO fx-991CN X 科学计算器 考试必备¥168📱 去京东购买京东精选需要一对一辅导?Need One-on-One Tutoring?
A-Level / GCSE / IB / KS3 全科辅导,地理学科专长
或截图后用「扫一扫 → 相册」选择本图