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Influences of seasonal freezing and thawing on soil Water-stable Aggregates in Orchard in High Cold Region,Northeast China

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Chinese Geographical Science 2021年第2期31卷 234-247页

作者： LIANG Yunjiang DENG Xu SONG Tao CHEN Guoshuang WANG Yuemei ZHANG Qing LU Xinrui College of Agriculture Yanbian UniversityYanji 133002China Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130012China

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 ***,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 *** 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 ***)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 *** 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 *** 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 *** 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 *** results of this study suggest that long-term planting fr

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

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