Change Characteristics and Evaluation of Soil Nutrient of Gully Cultivated Land in Loess Hilly and Gully Region
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S153.6

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    Abstract:

    [Objective] The characteristics of soil nutrient changes after gully control and land consolidation were investigated in order to improve the land consolidation methods, take the proper cultivation management measures and increase the nutrient utilization efficiency of the loess hilly and gully region.[Methods] Taking the typical land-consolidation project in Yan'an City, Shaanxi Province as the research object, soil samples at different locations of the gullies before and at 2, 3 a and 6 a after the consolidation were collected, and the change characteristics of soil organic matter, total nitrogen, available phosphorus and available potassium were analyzed based on the statistical analysis method. The comprehensive evaluation of soil nutrients was performed by matter-element model.[Results] ① The soil nutrient level in the study area was generally low, except for the available potassium. The variation of soil nutrients in the gully was relatively large, belonging to moderate degree of variation. After the land consolidation, the variation coefficient of soil nutrients tended to decrease. ② Soil organic matter content decreased at first and then increased with the increase of project implementation within 6 years after the gully consolidation, and the content of soil organic carbon was lower than that before consolidation. Soil total nitrogen and available phosphorus increased at first and then decreased, which was higher than those before years. Soil available potassium decreased continuously after consolidation. ③ Three years after the land consolidation, the soil nutrient evaluation level in the study area returned to the level before remediation, and had the potential to continue to improve.[Conclusion] Compared with slope land consolidation, soil nutrients could recover faster following the gully land consolidation in the loess hilly and gully region. According to the variation characteristics of soil nutrients in different locations, the grain yield could be increased through adjusting the spatial layout of crops and implementing different management strategies.

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王晶,董起广,张露,白清俊.黄土丘陵沟壑区沟道造地土壤养分变化特征及评价[J].水土保持通报英文版,2020,40(6):64-70,77

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History
  • Received:August 01,2020
  • Revised:September 01,2020
  • Adopted:
  • Online: January 23,2021
  • Published: