绿色环境暴露对居民心理健康的影响研究——以南京为例

doi:10.18306/dlkxjz.2020.05.007

摘要/Abstract

摘要：

绿色环境暴露对心理健康的影响长期以来都受到国内外不同领域学者的关注,但从个体与环境交互的角度关注衡量个体对环境实际感知的研究较少。论文试图基于对居民视觉感知和时空活动等因素的考虑,结合机器学习等技术扩展绿色环境暴露的测度方式,并构建绿色环境暴露对心理健康影响的概念框架。同时,以南京为实证对象,运用结构方程模型对比分析绿地率、绿视率、绿色视觉暴露对心理健康影响的差异。研究发现,3种绿色环境暴露测度指标对心理健康均有显著正向影响,但影响程度和路径存在差异,建立更加综合的绿色环境暴露评价指标体系至关重要。主观建成环境可以作为绿视率和绿色视觉暴露对心理健康影响的中介变量,身体活动仅作为绿色视觉暴露影响心理健康的中介变量。研究拓展了绿色环境暴露对心理健康影响的研究框架,并对城市绿地系统的规划管理具有参考价值。

关键词: 环境暴露, 绿色视觉暴露, 绿视率, 心理健康, 机器学习, 南京

Abstract:

The impact of greenspace exposure on mental health has long been the focus of scholars in different fields in China and internationally. Most studies are based on a single individual perspective, such as activity time, range of activities, and so on, or a single environmental perspective, such as the number of green spaces, green space accessibility, among others. Few studies have measured individuals' perception of the environment from the perspective of the interaction between the individuals and the environment. This study constructed a conceptual framework for the impact of green environment exposure on mental health based on considerations of residents' visual perception and spatiotemporal activities. In addition, this study also proposed a green visual exposure measurement method based on green view index and individual spatiotemporal activity, and estimated the green rate using convolutional neural network model and machine learning. This study took Nanjing City as an empirical research object, and used structural equation modeling to compare and analyze the differences in the impact of green rate, green view index, and total green visual exposure on mental health. In addition to observing the direct influences, environmental perception, physical activity, and sense of belongingness were selected as mediating variables to analyze the pathways of different indicators that affect mental health. The results show that the three greenspace exposure measurement indicators have a significant correlation with mental health, but the degree of influence and pathway are different. It is important to establish a more comprehensive green environment exposure evaluation index system. Subjective built-up environment perception can be used as a mediator of the impact of green view index and total green visual exposure on mental health. Physical activity only serves as a mediator of the impact of the total amount of green visual exposureon mental health. This study expands the research framework of the impact of greenspace exposure on mental health, and has important reference value for the planning and management of urban greenspace system.

Key words: environmental exposure, green visual exposure, green view index, mental health, machine learning, Nanjing City

李智轩, 何仲禹, 张一鸣, 金霜霜, 王雪梅, 朱捷, 刘师岑. 绿色环境暴露对居民心理健康的影响研究——以南京为例[J]. 地理科学进展, 2020, 39(5): 779-791.

LI Zhixuan, HE Zhongyu, ZHANG Yiming, JIN Shuangshuang, WANG Xuemei, ZHU Jie, LIU Shicen. Impact of greenspace exposure on residents’ mental health: A case study of Nanjing City[J]. PROGRESS IN GEOGRAPHY, 2020, 39(5): 779-791.

图/表 13

图1

图2

表1

表2

图3

表3

图4

表4

表5

表6

居民个人及家庭属性与模型其余变量的交叉分析"

变量名称	心理健康	绿色视觉暴露	身体活动总量	归属感		主观建成环境
变量名称	心理健康	绿色视觉暴露	身体活动总量	社区	南京	美观度	安全感	舒适度	安静感
性别
男	24.24(4.93)	0.47(0.15)	0.28(0.24)	2.57(0.88)	3.02(0.93)	2.80(1.17)	2.56(1.07)	2.35(0.97)	2.70(1.13)
女	24.64(4.98)	0.41(0.13)	0.29(0.26)	2.35(0.94)	2.92(1.06)	2.57(1.08)	2.37(1.07)	2.53(0.96)	2.53(1.13)
年龄
18岁及以下	23.32(5.59)	0.34(0.18)	0.33(0.26)	2.35(1.11)	2.70(1.01)	2.30(1.20)	2.35(1.20)	2.50(1.16)	2.75(1.22)
19~59岁	24.34(4.84)	0.45(0.20)	0.26(0.23)	2.51(0.88)	2.98(0.96)	2.70(1.08)	2.46(1.03)	2.48(0.94)	2.70(1.60)
60岁及以上	25.29(5.10)	0.44(0.20)	0.39(0.30)	2.23(0.94)	3.04(1.12)	2.77(1.30)	2.53(2.24)	2.23(1.03)	2.18(1.11)
学历
本科以下	24.65(4.97)	0.44(0.19)	0.35(0.28)	2.36(0.96)	2.91(1.07)	2.78(1.19)	2.50(1.14)	2.46(1.03)	2.62(1.17)
本科及以上	24.25(4.92)	0.43(0.15)	0.23(0.20)	2.55(0.86)	3.02(0.91)	2.61(1.07)	2.43(1.01)	2.43(0.92)	2.61(1.09)
家庭年收入
10万元以下	24.19(4.63)	0.45(0.18)	0.30(0.27)	2.50(0.92)	2.97(1.04)	2.69(1.15)	2.46(1.09)	2.43(0.93)	2.47(1.11)
10万~20万元	24.84(4.94)	0.47(0.17)	0.31(0.25)	2.36(0.85)	2.92(0.95)	2.66(1.11)	2.44(1.06)	2.48(1.04)	2.77(1.21)
20万~50万元	23.68(5.46)	0.37(0.14)	0.24(0.20)	2.43(0.93)	2.95(0.94)	2.60(1.10)	2.52(1.10)	2.37(0.97)	2.60(1.00)
50万元以上	27.11(4.70)	0.39(0.13)	0.23(0.21)	2.94(1.09)	3.41(1.00)	3.24(1.20)	2.47(1.07)	2.59(0.87)	2.88(1.11)
是否拥有汽车
有小汽车	24.70(4.81)	0.44(0.20)	0.32(0.27)	2.51(0.90)	2.99(1.00)	2.60(1.08)	2.47(1.05)	2.43(0.94)	2.70(1.13)
无小汽车	24.03(5.15)	0.43(0.19)	0.26(0.24)	2.38(0.92)	2.94(0.99)	2.82(1.20)	2.45(1.12)	2.47(1.02)	2.49(1.12)
总体	24.44(4.95)	0.44(0.20)	0.29(0.25)	2.46(0.91)	2.97(0.99)	2.69(1.13)	2.46(1.07)	2.44(0.97)	2.62(1.13)

表6

表7

模型拟合指数"

模型	$χ 2 / DF$	GFI	CFI	RMESA
模型1	2.610	0.908	0.842	0.067
模型2	2.768	0.905	0.832	0.070
模型3	2.596	0.910	0.849	0.067
参考值	1~3	>0.90	>0.90	<0.08

表7

表8

图5

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层级结构	卷积核尺寸	输出图片尺寸
Input		224×224×3
Conv2D	3×3	222×222×32
MaxPooling2D	2×2	111×111×32
Dropout		111×111×32
Conv2D	3×3	109×109×64
MaxPooling2D	2×2	54×54×64
Dropout		54×54×64
Conv2D	3×3	52×52×128
AveragePooling2D	2×2	26×26×128
Dropout		26×26×128
Conv2D	1×1	26×26×128
Dropout		26×26×128
Flatten		86528
Dense		256
Dropout		256
Dense		1

小区名称	建设年代	房价/元	小区属性	距市中心距离/km	楼层	有效问卷数
五福里	1949年前	3万以下	房改房/公房	0~5	低层	35
芳草园	1949—1998年	4万以上	商品房	0~5	高层	65
居安里	1949—1998年	3万~4万	房改房/公房	0~5	多层	63
海棠园	1999年后	4万以上	商品房	5~10	多层	64
莲花新城	1999年后	3万以下	安置房/经适房	5~10	高层	50
云燕园	1949—1998年	3万以下	房改房/公房	5~10	多层	40
银城东苑	1999年后	3万~4万	商品房	5~10	高层	42

小区名称	小区周边绿地率/%	小区周边绿视率/%	有效观测点数量/个	有效图片数量/张
五福里	15.07	24.00	2095	4282
芳草园	6.60	28.14	1017	2092
居安里	14.28	21.37	4305	10505
海棠园	12.36	29.53	1879	4096
莲花新城	15.51	16.50	1349	2128
云燕园	22.17	21.36	825	1663
银城东苑	10.26	35.81	855	1379

居民活动路线	出行时长/min	路线平均绿视率/%
路线A	10	24.12
路线B	15	25.73
路线C	6	23.15
路线D	13	22.23

变量类别	潜变量	测量变量	测量变量类型及取值
解释变量	绿色环境暴露	小区周边绿地率(模型1)	连续变量
		小区周边绿视率(模型2)	连续变量
		居民绿色视觉暴露(模型3)	连续变量(0~1)
中介变量	主观建成环境	我认为小区及周边绿化充足	有序分类变量(1~5)
		我认为在小区及周边步行是安全的
		我认为在小区及周边步行是舒适的
		我认为小区及周边环境安静
	身体活动	IPAQ中文版短表周身体活动总量	连续变量(0~1)
	归属感	我对现在居住的小区有归属感	有序分类变量(1~5)
		我对南京有归属感	有序分类变量(1~5)
因变量	心理健康	SWEMWBS中文版心理健康评分	有序分类变量(7~35)