Effects of Typical Land Use Types on Soil Nitrogen Characteristics in Karst Agricultural Areas of Southwest China

doi:10.11924/j.issn.1000-6850.casb2021-1216

Abstract

Abstract:

To investigate the influence of different land use types on soil nitrogen characteristics in karst area and clarify the migration characteristics and influencing factors of soil nitrogen under different land use types and depths, we took different types of soil (grassland, riverside zone, paddy field and dry land) around Kaizhang reservoir in Huaxi River Basin as the research objects, measured the basic physical and chemical properties of soil, the contents of total nitrogen, nitrate nitrogen and ammonium nitrogen, and analyzed the spatial distribution characteristics of different forms of soil nitrogen under different land use conditions in karst area, the composition proportion of nitrogen and the correlation between nitrogen and various environmental factors. The results showed that the average content of soil total nitrogen in agricultural land (paddy field and dry land) was higher than that in non-agricultural land (grassland and riverside zone), showing ‘surface accumulation’ in the vertical direction and a decrease with the soil depth increase as a whole. Affected by agricultural activities, the content of nitrate nitrogen in agricultural land was higher than that in non-agricultural land. In the vertical direction, the content of nitrate nitrogen in agricultural land changed greatly, and the overall trend decreased with soil depth. The content of ammonium nitrogen had little difference under different land use types, and was relatively stable in the vertical section. Comparing the proportion of nitrate nitrogen and ammonium nitrogen in inorganic nitrogen, it showed that the soil inorganic nitrogen in the study area was mainly ammonium nitrogen. There was a very significantly positive correlation between soil organic matter content and nitrogen in the study area (P<0.01), and there was a significantly negative correlation between soil pH and nitrogen (P<0.05). In summary, the soil nitrogen content of agricultural land is generally higher than that of non-agricultural land, and different land use types have a significant impact on nitrogen distribution in karst agricultural area.

Key words: karst agricultural area, nitrogen composition, land use types, influencing factors, spatial distribution

CLC Number:

TIAN Yutong, HAN Zhiwei, ZHAO Ran, TIAN Yongzhu, LUO Guangfei, YANG Miao. Effects of Typical Land Use Types on Soil Nitrogen Characteristics in Karst Agricultural Areas of Southwest China[J]. Chinese Agricultural Science Bulletin, 2022, 38(33): 89-96.

Figures/Tables 7

References 28

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	全氮	铵态氮	硝态氮	pH	有机质	含水率
全氮	1
铵态氮	0.499^**	1
硝态氮	0.733^**	0.111	1
pH	-0.413^**	-0.24	-0.279^*	1
有机质	0.726^**	0.347^**	0.652^**	-0.222	1
含水率	0.209	-0.163	-0.003	0.094	0.121	1

	全氮	铵态氮	硝态氮	pH	有机质	含水率
全氮	1
铵态氮	0.499^**	1
硝态氮	0.733^**	0.111	1
pH	-0.413^**	-0.24	-0.279^*	1
有机质	0.726^**	0.347^**	0.652^**	-0.222	1
含水率	0.209	-0.163	-0.003	0.094	0.121	1