Soil Chemical Properties under Various Land-Use Types in the Karst Area with a Case Study in Shibing County of China

Table 1

Characteristics of each sampling site.

No.	Land-use type	Altitude (m)	Vegetation	Coverage	Features
1	Pear orchard	1053	Pear tree	0.75	The average height of trees was 1.3 m, and the average age of trees was 4 years. No fruit was observed, and there were low weeds under the forest
2	Flue-cured tobacco field	1064	Flue-cured tobacco	0.20	From 2016 to 2018, flue-cured tobacco was cultivated. The average height of flue-cured tobacco was 10 cm when sampling, and no weeds were observed
3	Limestone shrubland	1071	Mainly Cyclobalanopsis glauca	0.85	The soil was moist. The thickness of the soil layer was 20 cm, and the thickness of the litter layer was 3 cm. Soil animals such as earthworms were found
4	Paddy field	972	Weeds	0.90	It was not yet cultivated, waterless with rice piles, and distributed with weeds such as rat grass, muddy vegetables, and sorghum. Gravel was found in soil
5	Dolomite shrubland	990	Mostly Cinnamomum camphora	0.85	The thickness of the litter layer was 3 cm, and the thickness of the soil layer was 20 cm. The sand content was high, and the soil was dry
6	Grass slope	1061	Mainly ferns and Miscanthus floridulus	1	It was a natural grass slope with a thickness of 15 cm. It was high in grit content. Shrubs were sparsely distributed
7	Dryland	1043.1	No vegetation	0	The crops planted in 2017 were peppers. The land has been ploughed, and no crops have been planted. No weeds were found
8	Forest	956	Mostly Platycladus and Pinus massoniana	0.90	The thickness of the litter layer was 1.5 cm, and the thickness of the soil layer was 10 cm. The sand content was high, and there were lichens