川西高原季节性雪被覆盖对窄叶鲜卑花凋落物分解和养分动态的影响
摘要： 2010年1—5月在川西高原采用人工雪厚度梯度试验（0、30和100 cm），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，30 cm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.
关键词: 川西高原, 雪被覆盖, 窄叶鲜卑花, 凋落物分解, 养分
Abstract: Soil-borne bag method was adopted to study the decomposition and nutrient dynamics of Sibiraea angustata leaf litter under different depths (0, 30 and 100 cm) of snow cover in western Sichuan plateau in January-May, 2010. In snow-free plot, the mass loss rate of the litter over the five months was 29.9%; in the plots with 30 and 100 cm snow cover, the litter mass loss rate was 33.8% and 35.2%, respectively. During the decomposition, definite N enrichment in the litter was observed, while the P enrichment fluctuated. The C content and C/N ratio of the litter decreased sharply at the early stage of decomposition, but increased gradually after then. Snow cover greatly contributed to the rapid decomposition of litter and the N enrichment in the litter, but had little effects on the litter C and P contents. In western Sichuan plateau, durable snow cover with a depth of >30 cm could alter the litter decomposition pattern, and substantially affect the soil nutrient turnover and plant community composition.
Key words: western Sichuan plateau, snow cover, Sibiraea angustata, litter decomposition, nutrient.
相关知识
模拟气候变化对3种草原植物群落混合凋落物分解的影响
凋落物混合效应的“绽放”：花和叶凋落物相互作用对陆地和水生生态系统分解的作用,Biogeosciences
青藏高原东部窄叶鲜卑花灌丛土壤C、N、P生态化学计量学特征
花椒林地土壤动物多样性及其对凋落物分解的作用——以贵州花江峡谷为例
立枯物和凋落物对土壤微环境及植物生长的影响
施氮对青藏高原东缘窄叶鲜卑花灌丛土壤呼吸的影响
青藏高原东缘窄叶鲜卑花灌丛生长季土壤无机氮对增温和植物去除的响应
青藏高原东缘窄叶鲜卑花灌丛生长季土壤无机氮对增温和植物去除的响应.PDF
《Geoderma》带你真正了解植物凋落物分解和固碳的奥秘
气候变暖对森林土壤碳循环的影响
网址: 川西高原季节性雪被覆盖对窄叶鲜卑花凋落物分解和养分动态的影响 https://m.huajiangbk.com/newsview394700.html
| 上一篇: 弄岗北热带喀斯特季节性雨林15 |
下一篇: 水培植物季节性光照管理 |
