Spectroscopic Characteristics of Dissolved Organic Matter in Afforestation Forest Soil of Miyun District, Beijing

Table 1

Locations and afforestation information of the samples.

Abbreviation	Tree species	Growing period	Coordinates
Y-1	Pagoda tree	1 yr	N40°24′59.6′′, E116°45′43.7′′
Y-4	Pagoda tree	4 yrs	N40°24′30.8′′, E116°45′00.0′′
Y-10	Populus tomentosa	10 yrs	N40°23′58.4′′, E116°43′41.6′′
Y-15	Populus tomentosa	15 yrs	N40°24′00.7′′, E116°43′37.1′′
Y-20	Shrub and locust	20 yrs	N40°20′52.2′′, E116°49′22.0′′