Climate Change and Dryland Agricultural Ecosystem Management

effective new method. Finally, the article bring forwards suggestions to improve the water resources
sustainable development. It can provide decision-making for water resources sustainable utilization.
The main conclusions as follows:
(1) This article mainly considered the water resources relatively single in arid inland river basin and
according the system thinking as the instruction, put forward four sub-systems of water resources
condition, social, the economical and the ecological environment and fourteen evaluating indicators to
compose the water resources sustainable evaluation index system.
(2) In the evaluation method, this article combined the entropy value and the projection pursuit,
obtained the water resources sustainable development condition. The results showed that the trend of
water resources sustainable potential is benign. The basin water resources sustainable utilization level
is bad slightly and the water resources potential was small. Along with water saving irrigation practice
and industrial structure redressal, the water resources sustainable development level had the change
for the better in 2010 and 2020.
(3) The example analysis indicated that this model is reliable and the analysis result is reasonable. The
results can analysis the subject matter in water resources development and it can provide the scientific
basis for the water resources sustainable development. It is a new method to evaluate the water
resources sustainable level.
(4) The water resources condition is the most important factor to affect water resources sustainable
level in the basin. In order to achieve the water resources sustainable target, we suggested some advice
as follows: The basin should pay great attention to the water resources depth development from now
on, reduces the agricultural water, develop water-preservation industry, implement water saving
irrigation, advocated micro-salty water as resources and increases the new water source. Through
these measure's further implementation, the contradictory of water resources supply and demand will
alleviate enormously and the water resources sustainable utilization level will be improved.
Keywords: EV-PP model; evaluation index; sustainable utilization; Manas River basin
Model-based estimation of the canopy transpiration of Qinghai
spruce (Picea crassifolia) forest in the Qilian Mountains
Tian Fengxia1, 2, Zhao Chuanyan3,∗, Feng Zhaodong1
1 MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China
2 Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China
3 MOE Key Laboratory of Arid and Grassland Ecology, Lanzhou University, Lanzhou 730000, China
Abstract: The canopy transpiration of forests is one of the most important components in the water
balance and it is nevertheless the least-understood component primarily because observational data are
unavailable. Modeling thus remains to be an effective tool in estimating the canopy transpiration of
forests. Qinghai spruce (Picea crassifolia) forest plays an important role in regulating the water
balance in the Qilian Mountains through its effects on different hydrological components (including
rainfall interception, canopy transpiration, and soil infiltration) and again the canopy transpiration of
∗ Corresponding author: ZHAO Chuanyan3, Email: nanzhr@lzb.ac.cn
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