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32Livestock grazing is a crucial cause of vegetation degradation and desertification in sandy lands. 33The sparse-elm grassland of Horqin Sandy Land, China has suffered severe degradation of 34 biodiversity and ecosystem services. Management to exclude grazing is often necessary for

Street trees provide critical ecosystem services and economic benefits that are often disregarded, due to their unknown monetary value. This study analyzed the structural characteristics of Dalian's street trees and estimated the monetary value of structural and functional benefits by i-Tree Streets. Dalian's street trees encompassed 28 species and were dominated by Ginkgo biloba, Platanus acerifolia and Sophora japonica, comprising 64.1% of a total of 57,699 trees. The age structure of street trees was distributed somewhat unevenly, with 18% young trees, 56% maturing trees, 25% mature trees and 1% old trees. These trees provide annual functional benefits valued at US$4.9 million and delivered a benefit-cost ratio of 3.