中国地理科学 ›› 2021, Vol. 31 ›› Issue (2): 234-247.doi: 10.1007/s11769-021-1187-7

• 论文 • 上一篇    

Influences of Seasonal Freezing and Thawing on Soil Water-stable Aggregates in Orchard in High Cold Region, Northeast China

LIANG Yunjiang1, DENG Xu1, SONG Tao1, CHEN Guoshuang2, WANG Yuemei1, ZHANG Qing1, LU Xinrui2   

  1. 1. College of Agriculture, Yanbian University, Yanji 133002, China;
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China
  • 收稿日期:2020-05-20 发布日期:2021-02-06
  • 通讯作者: LU Xinrui E-mail:luxinrui@iga.ac.cn
  • 基金资助:
    Under the auspices of National Natural Science Foundation of China (No. 31460117, 41877024)

Influences of Seasonal Freezing and Thawing on Soil Water-stable Aggregates in Orchard in High Cold Region, Northeast China

LIANG Yunjiang1, DENG Xu1, SONG Tao1, CHEN Guoshuang2, WANG Yuemei1, ZHANG Qing1, LU Xinrui2   

  1. 1. College of Agriculture, Yanbian University, Yanji 133002, China;
    2. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China
  • Received:2020-05-20 Published:2021-02-06
  • Contact: LU Xinrui E-mail:luxinrui@iga.ac.cn
  • Supported by:
    Under the auspices of National Natural Science Foundation of China (No. 31460117, 41877024)

摘要: Soil aggregate stability, as an important indicator of soil functions, may be affected by seasonal freezing and thawing (SFT) and land use in high cold and wet regions. Therefore, comprehensive understanding the effects of SFT on aggregate stability in orchards during winter and spring is crucial to develop appropriate management strategies that can effectively alleviate the degradation of soil quality to ensure sustainable development of orchard ecosystems. To determine the mechanism of degradation in orchard soil quality, the effects of SFT on the stability of water-stable aggregates were examined in apple-pear orchards (Pyrus ussuriensis var. ovoidea) of four different ages (11, 25, 40, and 63 yr) on 0 to 5% slopes before freezing and after thawing from October 2015 to June 2016 in Longjing City, Yanbian Prefecture, Northeast China, involving a comparison of planted versus adjacent uncultivated lands (control). Soil samples were collected to investigate water-stable aggregate stability in three incremental soil layers (0-20, 20-40 and 40-60 cm). In the same samples, iron oxide, organic matter, and clay contents of the soil were also determined. Results showed that the destructive influences of SFT on water-stable aggregates were more pronounced with the increased orchards ages, and SFT exerted severe effects on water-stable aggregates of older orchards (40 and 63 yr) than juvenile orchards. Undergoing SFT, the soil instability index and the percentage of aggregate destruction increased by mean 0.15 mm and 1.86%, the degree of aggregation decreased by mean 1.32%, and the erosion resistance weakened, which consequently led to aggregate stability decreased. In addition, soil free, amorphous, and crystalline iron oxide as well as soil organic matter and clay contents are all important factors affecting the stability of water-stable aggregates, and their changes in their contents were consistent with those in the stability of water-stable aggregates. The results of this study suggest that long-term planting fruit trees can exacerbate the damaging effects of SFT on aggregate stability and further soil erosion increases and nutrient losses in an orchard, which hider sustainable use of soil and the productivity orchards.

关键词: water-stable aggregates, orchard age, apple-pear orchard, soil seasonal freezing and thawing, soil degradation, high cold region

Abstract: Soil aggregate stability, as an important indicator of soil functions, may be affected by seasonal freezing and thawing (SFT) and land use in high cold and wet regions. Therefore, comprehensive understanding the effects of SFT on aggregate stability in orchards during winter and spring is crucial to develop appropriate management strategies that can effectively alleviate the degradation of soil quality to ensure sustainable development of orchard ecosystems. To determine the mechanism of degradation in orchard soil quality, the effects of SFT on the stability of water-stable aggregates were examined in apple-pear orchards (Pyrus ussuriensis var. ovoidea) of four different ages (11, 25, 40, and 63 yr) on 0 to 5% slopes before freezing and after thawing from October 2015 to June 2016 in Longjing City, Yanbian Prefecture, Northeast China, involving a comparison of planted versus adjacent uncultivated lands (control). Soil samples were collected to investigate water-stable aggregate stability in three incremental soil layers (0-20, 20-40 and 40-60 cm). In the same samples, iron oxide, organic matter, and clay contents of the soil were also determined. Results showed that the destructive influences of SFT on water-stable aggregates were more pronounced with the increased orchards ages, and SFT exerted severe effects on water-stable aggregates of older orchards (40 and 63 yr) than juvenile orchards. Undergoing SFT, the soil instability index and the percentage of aggregate destruction increased by mean 0.15 mm and 1.86%, the degree of aggregation decreased by mean 1.32%, and the erosion resistance weakened, which consequently led to aggregate stability decreased. In addition, soil free, amorphous, and crystalline iron oxide as well as soil organic matter and clay contents are all important factors affecting the stability of water-stable aggregates, and their changes in their contents were consistent with those in the stability of water-stable aggregates. The results of this study suggest that long-term planting fruit trees can exacerbate the damaging effects of SFT on aggregate stability and further soil erosion increases and nutrient losses in an orchard, which hider sustainable use of soil and the productivity orchards.

Key words: water-stable aggregates, orchard age, apple-pear orchard, soil seasonal freezing and thawing, soil degradation, high cold region