Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (29): 118-128.doi: 10.11924/j.issn.1000-6850.casb2021-1074

Special Issue: 生物技术 农业生态 耕地保护

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The Quality Grade and Nutrient Characteristics of Cultivated Land in Pingchuan District

PAN Xue(), CAI Liqun(), DONG Bo, NIE Guangyun   

  1. College of Resources and Environment, Gansu Agricultural University, Lanzhou 730070
  • Received:2021-11-08 Revised:2022-01-23 Online:2022-10-15 Published:2022-10-14
  • Contact: CAI Liqun E-mail:793999040@qq.com;cailq@gsau.edu.cn

Abstract:

The study aims to comprehensively and timely grasp the cultivated land quality grade, nutrient spatial distribution characteristics and nutrient content difference of different soil types in Pingchuan District of Baiyin City, Gansu Province, and provide an effective basis for rational planting and fertilization in the future. According to the national standard of Cultivated Land Quality Grade, the cultivated land resource management information system at county scale was used to analyze the cultivated land quality grade, nutrient spatial distribution and nutrient content difference of different soil types in Pingchuan. The results showed that the cultivated land quality in Pingchuan belonged to grade five to ten, without cultivated land of grade one, two, three and four. The cultivated land of grade seven had an area of 13543.35 hm2, accounting for 34.51% of the total cultivated land area in Pingchuan. The overall nutrient level of the cultivated land in Pingchuan was low, and the cultivated land with low soil organic matter content and total nitrogen content showed a bipolar distribution. The cultivated land with low content of available phosphorus was concentrated, and the cultivated land distribution of other grades was scattered. The cultivated land with high available potassium content was concentrated in the villages and towns in southern Pingchuan; and the nutrient contents of deep cultivated lime-calcium soil were overall high among the six soil types in Pingchuan, and the coefficient of variation was the lowest.

Key words: Pingchuan District, cultivated land quality grade evaluation, hierarchical analysis, farmland resource management information system at county scale, soil nutrients

CLC Number: