adjustment to regulate water use intensity has great
limitations.
(4) Studying the effect of industrial structure
upgrading within the industry, as shown in Figure 3,
2012 is a significant node. From 2000 to 2012, the
cumulative contribution values of the output value of
the first, second, and third industries to the upgrading
effect of industrial structure is -276.16 billion cubic
meters / billion, -161.68 billion cubic meters / billion,
and -655.50 billion cubic meters / billion respectively,
which played an inhibitory role; from 2012 to 2019,
the cumulative contribution value of the output value
of the first, second and third industries to the
upgrading effect of the industrial structure was
154.74 billion cubic meters / billion, 92.25 billion
cubic meters / billion and 43.42 billion cubic meters /
billion respectively, which played a promoting role;
since 2019, it has turned to inhibition. With the rising
contribution rate of the tertiary industry, the utility
value of industrial structure upgrading has been
effectively increased, and the water intensity of the
economic belt has been inhibited from 2000 to 2012.
Since 2012, the state has implemented the most
stringent water resources management system,
strengthened the red line management of water
resources development and utilization control, and
strictly implemented the total amount of water
control. The use of regional water resources has been
strictly planned and managed, and the construction of
a water-saving society has been comprehensively
promoted, which effectively improves the water use
efficiency of the three major industries. Therefore,
while focusing on the industrial structure, we should
pay more attention to the optimization and upgrading
of the industry itself (Zhang 2020). Combined with
the driving mechanism of the water-saving
technology effect of the tertiary industry and the
extraction effect of domestic water on water intensity,
we should improve the internal proportion of the
tertiary industry and develop a more water-saving and
high-quality tertiary industry to inhibit the increase of
water intensity in the Yangtze River Economic Belt.
5 CONCLUSIONS AND POLICY
RECOMMENDATIONS
5.1 Conclusion
In this paper, the LMDI decomposition expansion
model of the time dimension difference of water
intensity is constructed to explore the specific
mechanism affecting the internal water intensity of
the Yangtze River Economic Belt. The effect of water
intensity is divided into industrial effect, industrial
structure upgrading effect, tertiary industry water-
saving technology effect, and domestic water
extraction effect. Through data integration and
empirical analysis, it is found that the upgrading of
industrial structure is an important restraining factor
for water use intensity from 2000 to 2020, but its
driving effect changed from negative to positive in
2012-2019 promoting the growth of water use
intensity. In terms of the other three effects, the
tertiary industry water-saving technology effect and
domestic water extraction effect are the primary and
secondary factors that inhibit the growth of water use
intensity in each province and city of the economic
belt, while the industrialization effect generally
promotes the increase of water use intensity.
5.2 Policy Recommendations
5.2.1 Optimizing the Inter-Industry
Structure and Developing a
Higher-quality Tertiary Industry
Provinces and cities should pay attention to the
relationship between the upgrading of industrial
structure and the water use intensity, adhere to the
priority of water-saving strategy (Ma 2014), “
determine the demand with water ” and “ adjust to
water ”, continuously increase the proportion of
industries and services which have high water use
efficiency, continuously improve the industrial
quality and the intensity of knowledge economy of
the tertiary industry in each province and city, and
vigorously support the development of water-saving
industries, so as to achieve effective control of water
use intensity.
5.2.2 Focus on Technology and Promote the
Continuous Development of a
Water-saving Society
Strengthen the strength of science and technology,
strengthen the foundation of science and technology,
strengthen the implementation of policies such as the
national water-saving action plan, improve the
process flow, vigorously develop water-saving
technology, optimize the water use capacity of high
water consumption industries such as steel and
petrochemical, and cultivate water-saving
enterprises. Speed up the transformation of
theoretical results to the actual, promote the
production and industrialization of water-saving
technology, and build a water-saving society.