Spatial Distribution and Formation of Phosphorus in Typical Land-use Soils in Karst Agricultural Areas

doi:10.11924/j.issn.1000-6850.casb2021-0903

Abstract

Abstract:

A study on the spatial distribution, migration characteristics and influencing factors of phosphorus in vertical and horizontal soil under different land use types in karst agricultural areas was carried out. A total of 56 samples were collected from 9 soil profiles under typical land use types (grassland, riverside, paddy field, dry land, etc.) around Kaizhang reservoir, and the water content, pH, organic matter, exchangeable acid, total phosphorus, available phosphorus and inorganic phosphorus of each soil profile were determined. The results demonstrated that the total phosphorus content and available phosphorus content were measured to be over a wide range of 420.73-1669.53 mg/kg and 2.50-64.14 mg/kg, respectively, and the soil phosphorus activation coefficient was in the range of 0.34%-5.96%. It was found that available phosphorus content in the surface soil of agricultural land was more than 15 mg/kg, which was correlated with the overuse and waste of phosphate fertilizer. Meanwhile, the risk of phosphorus leaching downward into underground water was found in the surface soil of dry land in the agricultural area behind the dam (the average content of available phosphorus was 64.14 mg/kg). The soil inorganic phosphorus forms in paddy field and dry land were mainly Fe-P and Al-P, and in grassland and riverside were mainly Fe-P and O-P. The results indicated that soil pH was significantly and negatively correlated with available phosphorus, Fe-P and Al-P, and soil organic matter was significantly and positively correlated with total phosphorus, available phosphorus, Al-P, and Fe-P. It is concluded that the soil phosphorus content of agricultural area is generally higher than that of non-agricultural area because of different phosphorous distributions in different land use types. The study clarifies the spatial distribution of phosphorus and its forms in karst agricultural areas, which could provide a basis for the prevention and control of agricultural non-point source pollution caused by phosphorus.

Key words: karst agricultural area, phosphorus, soil profile, inorganic phosphorus form, distribution characteristics

CLC Number:

YANG Miao, TIAN Yongzhu, HAN Zhiwei, LUO Guangfei, ZHAO Ran, TIAN Yutong, XIAO Han. Spatial Distribution and Formation of Phosphorus in Typical Land-use Soils in Karst Agricultural Areas[J]. Chinese Agricultural Science Bulletin, 2022, 38(29): 108-117.

Figures/Tables 11

References 35

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	pH	交换性H⁺	交换性Al³⁺
pH	1
交换性H⁺	-0.706^**	1
交换性Al³⁺	-0.304^*	0.370^**	1

	pH	交换性H⁺	交换性Al³⁺
pH	1
交换性H⁺	-0.706^**	1
交换性Al³⁺	-0.304^*	0.370^**	1

	pH	OM	TP	AP	Al-P	Fe-P	O-P	Ca-P
pH	1
OM	-0.222	1
TP	-0.072	0.695^**	1
AP	-0.278^*	0.411^**	0.572^**	1
Al-P	-0.407^**	0.498^**	0.613^**	0.919^**	1
Fe-P	-0.281^*	0.587^**	0.775^**	0.774^**	0.813^**	1
O-P	0.207	0.199	0.215	0.061	0.103	0.115	1
Ca-P	0.01	0.007	0.033	0.058	0.048	-0.041	0.089	1

	pH	OM	TP	AP	Al-P	Fe-P	O-P	Ca-P
pH	1
OM	-0.222	1
TP	-0.072	0.695^**	1
AP	-0.278^*	0.411^**	0.572^**	1
Al-P	-0.407^**	0.498^**	0.613^**	0.919^**	1
Fe-P	-0.281^*	0.587^**	0.775^**	0.774^**	0.813^**	1
O-P	0.207	0.199	0.215	0.061	0.103	0.115	1
Ca-P	0.01	0.007	0.033	0.058	0.048	-0.041	0.089	1