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2010年1—5月在川西高原采用人工雪厚度梯度试验(0、30和100cm),应用网袋分解法对窄叶鲜卑花叶片凋落物进行分解试验,测定了凋落物的分解速率及其养分动态.结果表明:在无雪被覆盖的样地上分解5个月后的凋落物质量损失率为29.9%,而中雪和深雪样地的凋落物质量损失率分别为33.8%和35.2%.分解过程中,凋落物氮存在一定的富集现象,磷处于波动的富集状态,碳质量分数和碳氮比均呈现前期急剧下降后期逐渐上升的趋势.雪被覆盖显著增加了凋落物的质量损失率和氮含量,而对碳和磷含量无显著影响.在川西高原地区,30cm以上的持续雪被覆盖能够改变凋落物的分解过程,从而可能对土壤营养物质转化和植物群落构建产生实质性的影响.
From January to May in 2010, the artificial snow thickness gradient test (0, 30 and 100 cm) was applied in the western Sichuan Plateau to decompose the litter of narrow-leaf hippocastanum leaves by net-bag decomposition method. The litter decomposition rate and its nutrient content The results showed that the litter weight loss rate was 29.9% after 5 months of decomposition in the snow-covered plots, and 33.8% and 35.2% of the litters in the snow and deep snow samples, respectively. During the process, there was a certain enrichment of litter nitrogen, phosphorus was in a fluctuating and enrichment state, and the carbon mass fraction and C / N ratio all showed a gradual upward trend in the early period of rapid decline.The snow cover significantly increased the mass loss of litter Rate and nitrogen content, but had no significant effect on carbon and phosphorus content.In the western Sichuan plateau, the continuous snow cover of more than 30cm could change the decomposition process of litter, which may have a substantial effect on soil nutrient conversion and plant community construction influences.