基于随机森林模型的西藏人口分布格局及影响因素

doi:10.11821/dlxb201904004

Abstract

Abstract:

Clarifying the spatial pattern of population distribution, its influencing factors and regional differences at the township level is of great guiding significance for formulating sustainable development policies in ecologically fragile areas. Based on the population census data of Tibet at the township level in 2010, the population density and spatial factors were extracted. The density and clustering characteristics of the population distribution were analyzed by spatial statistical method. The multiple linear regression method and the random forest regression method were used to explore the population influencing factors and their regional differences of population distribution. The results showed that: (1) The population density of Tibet at the township level showed a strong spatial non-equilibrium. The general trend was high in the southeast and low in the northwest, and there was a strong spatial coupling between the main rivers and the main traffic trunks in high density area. (2) The "core-edge" characteristic of population clustering was obvious, and roughly to the wave of Borong (Nyalam County)-Gangni (Anduo County) as the demarcation line. (3) In the multiple linear regression method, the artificial surface index had the greatest influence on the population distribution, followed by the nighttime light index and road network density. (4) Random forest method was more accurate than multiple linear regression method to predict the population density, which can be used to sort the importance of the influencing factors. The influencing factors of the first six factors were the night light index, artificial surface index, road network density, industrial output value, GDP and multi-year average temperature, and these factors were positively correlated with population density. Among topographic factors, the contribution rate of elevation and slope was the largest, which was negatively correlated with population density. (5) The influencing factors and their interactions of population distribution in Tibet showed obvious regional differences. The valley was a gathering area for population in the study region, mainly in Lhasa River Valley, Nianchu River Valley and Sanjiang River Valley. (6) Through the analysis of random forest regression, the conceptual model can be used to express the influencing factors of population distribution, and the dominant factors were summarized as land use structure, road accessibility and urbanization level.

Key words: population distribution, influencing factor, township scale, random forest, conceptual model

Chao WANG, Aike KAN, Yelong ZENG, Guoqing LI, Min WANG, Ren CI. Population distribution pattern and influencing factors in Tibet based on random forest model[J].Acta Geographica Sinica, 2019, 74(4): 664-680.

Figures/Tables 10

Tab. 1

Influencing factors of population distribution

影响因素	影响因子	描述
地形地貌(A)	海拔(A₁)	地形地貌是影响人口分布的最基本因素之一：随着海拔高度的增加,地形起伏度呈现逐渐升高趋势,人口也随之减少^[20];在中国人口大多居住在坡度小于15°的地区^[19];而坡向是构成地形地貌因素的重要定量指标,通过调节各自然要素的分配影响人口分布,已有研究将其作为乡镇尺度人口分布的影响因子^[28]。
	坡度(A₂)
	坡向(A₃)
	地形起伏度(A₄)
气候(B)	多年平均降雨量(B₁)	人类对不同水热条件影响下的资源和环境条件具有选择偏好,在较广的范围内,人口密度与气温、降水量呈显著的正相关关系^[29]。
气候(B)	多年平均气温(B₂)
植被覆盖(C)	NDVI(C)	以NDVI为代表的植被指数能反映植被覆盖情况,一方面显示了人类生产生活所依赖的植被资源分布,另一方面则展示了不适宜居住区的空间分布(如沙漠和密林)^[30]。
土地利用(D)	土地利用指数(D_n)	根据“无土地则无人口”原则,人口分布受特定的土地利用类型影响,且土地利用面积与人口分布具有强相关性^[22]。
河流(E)	河网密度(E₁)	河流一方面为人们提供充足而稳定的水源,另一方面造就沿岸地势低平、土壤肥沃的格局,为人们居住生活、基础设施建设和发展生产提供适宜的空间^[20]。
河流(E)	距河流距离(E₂)
道路(F)	路网密度(F₁)	基于交通条件的区域可达性与人口分布关系密切,该因素对欠发达地区人口集聚所起的作用远大于发达地区^[15]。
道路(F)	距道路距离(F₂)	基于交通条件的区域可达性与人口分布关系密切,该因素对欠发达地区人口集聚所起的作用远大于发达地区^[15]。
经济发展(G)	夜间灯光指数(G₁)	夜间灯光亮度是城镇化的一个解释性指标,能反映城镇化水平,根据灯光影像的亮度值和人口距离衰减定律可以估算人口总数和人口分布^[31,32];也可以在一定程度上反映GDP,但两者的定量关系仍存在较大不确定性,并且夜间灯光指数反映的是消费而非生产^[33],不能完全替代经济统计数据;另外它还能反映区域的总体能源消耗量^[34,35]。一般来说,区域人口分布与经济发展之间具有较强的一致性,产业结构的差异也会影响人口分布^[36,37]。
	GDP(G₂)
	工业总产值(G₃)
	农林牧渔业产值(G₄)

Tab. 1

Fig. 1

Tab. 2

Fig. 2

Tab. 3

Fig. 3

Fig. 4

Fig. 5

Tab. 4

Fig. 6

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人口密度分级(人/km²)	统计单元个数(个)	总人口(人)	人口占比(%)	总面积(km²)	面积占比(%)
0~1	102	235880	7.86	768471	63.82
1~4	189	550149	18.33	244664	20.32
4~7	115	482070	16.06	91516	7.60
7~10	75	378282	12.60	45631	3.79
10~40	126	870345	28.99	51935	4.31
40~70	7	43936	1.46	918	0.08
70~100	1	6621	0.22	74	0.01
100~400	6	142181	4.74	722	0.06
400~700	2	93542	3.12	172	0.01
>700	1	199159	6.63	68	0.01

影响因子	序号	与人口密度相关系数	与人口总数相关系数	相关系数平均值
海拔	A₁	-0.137^**	-0.172^**	-0.155
坡度	A₂	-0.058	-0.058	-
坡向	A₃	0.013	0.016	-
地形起伏度	A₄	-0.043	-0.058	-
多年平均降雨量	B₁	-0.057	-0.02	-
多年平均气温	B₂	0.171^**	0.197^**	0.184
NDVI	C	-0.001	0.047	-
冰川和永久积雪指数	D₁	-0.044	-0.047	-
草地指数	D₂	-0.043	-0.008	-
耕地指数	D₃	0.078	0.088^*	-
灌木指数	D₄	0.067	0.049	-
裸地指数	D₅	-0.05	-0.100^*	-
人造地表指数	D₆	0.942^**	0.810^**	0.876
森林指数	D₇	-0.025	-0.009	-
湿地指数	D₈	-0.015	-0.02	-
水体指数	D₉	-0.023	-0.021	-
苔原指数	D₁₀	-0.005	0.072	-
河网密度	E₁	0.498^**	0.437^**	0.468
距河流距离	E₂	-0.045	-0.071	-
路网密度	F₁	0.664^**	0.630^**	0.647
距道路距离	F₂	-0.048	-0.089^*	-
夜间灯光指数	G₁	0.902^**	0.792^**	0.847
GDP	G₂	0.398^**	0.490^**	0.444
工业总产值	G₃	0.453^**	0.452^**	0.453
农林牧渔业产值	G₄	0.036	0.327^**	-

地区	R²	MAE	排序1	排序2	排序3	排序4	排序5	排序6
拉萨市	0.98	50.84	G₁	D₆	B₂	G₃	A₁	D₂
昌都地区	0.96	1.94	A₁	D₆	G₁	B₂	G₂	D₃
山南地区	0.95	3.36	D₃	B₂	A₁	D₆	G₁	D₁
日喀则地区	0.97	3.53	D₆	G₁	D₃	F₁	B₂	A₁
那曲地区	0.92	0.60	C	A₁	B₁	B₂	F₁	D₆
阿里地区	0.98	0.30	D₆	G₁	D₃	B₂	F₁	D₁
林芝地区	0.87	1.16	G₁	D₆	F₁	F₂	D₈	A₂

Population distribution pattern and influencing factors in Tibet based on random forest model

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