Effects of snow cover and freeze-thaw cycles on stability of surface soil aggregates in forest
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摘要: 以长白山地区3种不同林型土壤为研究对象,利用野外采样观测与室内模拟培养相结合的方式,研究积雪与冻融过程对土壤团聚体稳定性的影响。结果表明:1)冬季冻融过程使白桦成熟林土壤团聚体稳定性(MWD)出现显著下降(P<, 0.01),但并未显著影响白桦幼龄林和阔叶红松成熟林。冬季冻结及春季冻融过程都能显著影响团聚体MWD值(P<, 0.01), 2)提前雪盖能够防止土壤秋冬季冻融及冬季土壤结冻,并能够显著增加团聚体MWD值,但并不能防止春季融雪冻融阶段团聚体MWD值下降。3)土壤团聚体在冻融过程中受到不同冻融次数、不同林型以及不同含水率影响,差异显著。本文的研究结果表明,气候变暖、冬季降水格局变化这些全球变化因素能够影响到雪盖、土壤温度、湿度等因素,从而影响土壤团聚体稳定性。Abstract: Snow cover is an important ecological factor that can affect soil freezing-thawing process by changing the heat exchange between atmosphere and soil, and therefore impact soil aggregates. We conducted laboratory incubation experiment and field sampling to study the effects of snow cover and freeze-thaw process on the stability of soil aggregates in three types of forest in Changbai Mountains, northeast China. The results showed that: 1) the winter freeze-thaw process significantly decreased the stability of soil aggregates in the mature broad-leaf forest (P<, 0.01), but did not significantly affect that of the young broad-leaved forest and mature broad leaf-Korean pine mixed forest. The stability of soil aggregates was significantly affected by freeze in winter and freeze-thaw process in spring. 2) Snow cover in advance can prevent soil freeze-thaw process in early winter and freezing in winter and therefore significantly increase aggregate stability value, but cannot prevent the decrease of soil aggregate stability value during the spring freeze-thaw process. 3) Forest type, freeze-thaw cycles and water content significantly influence soil aggregates stability. In conclusion, the soil aggregates stability can be affected by the global climate changes such as climate warming and precipitation pattern change through changing factors like snow cover, soil temperature, and soil moisture.
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Key words:
- freeze-thaw cycles /
- water-stable aggregate, temperate forest /
- forest type /
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