April 25, 2024 Hao, R., D. Yu and J. Wu. 2017. Relationship between paired ecosystem services in the grassland and agro-pastoral transitional zone of China using the constraint line method. Agriculture, Ecosystems & Environment 240(Ma):171-181. Home » Hao, R., D. Yu and J. Wu. 2017. Relationship between paired ecosystem services in the grassland and agro-pastoral transitional zone of China using the constraint line method. Agriculture, Ecosystems & Environment 240(Ma):171-181.