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特大冰雪害后杉木人工林土壤氮素矿化特点

发表时间:2014-10-15  浏览量:1525  下载量:483
全部作者: 谢昕云,赵竑绯,施文涛,徐小牛
作者单位: 安徽农业大学林学与园林学院;安徽农业科学研究院
摘 要: 为探讨冰雪灾害对森林生态系统养分循环的影响,对安徽老山自然保护区不同受损程度(轻、中、重3种类)的13年生杉木[Cunninghamia lanceolata (Lamb.) Hook.]林土壤氮素矿化特点进行了为期2年的观测分析。结果表明,不同受损林分0~20 cm表土氮素净矿化速率大小依次为:重度>中度>轻度,中度和重度受损林分土壤硝化速率显著提高,分别占净矿化速率的63.7%和70.6%,显著高于轻度受损林分(56.8%)。年均氮素矿化速率和硝化速率与土壤温度、有效氮及溶解有机氮(dissolved organic nitrogen, DON)含量呈显著的正相关(P<0.05)。研究结果表明,雪灾干扰引起土壤氮素生物地球化学过程明显变化,硝化作用增强,造成土壤氮素损失增加。
关 键 词: 森林培育学;冰雪害;氮素矿化;土壤微生物生物量;有效氮;人工林
Title: Characteristics of soil nitrogen mineralization in a Chinese-fir plantation after the extremely heavy glaze and snow storms
Author: XIE Xinyun, ZHAO Hongfei, SHI Wentao, XU Xiaoniu
Organization: School of Forestry & Landscape Architecture, Anhui Agricultural University; Anhui Academy of Agriculture Science
Abstract: In order to reveal the impact of heavy snow-storm on nutrient cycling in forest ecosystems, the characteristics of soil N mineralization in a 13-year-old Cunninghamia lanceolata (Lamb.) Hook. plantation with different (slight, moderate and severe) damages were studied over two years. The results showed that the rates of net N mineralization of 0-20 cm mineral soil for the differently damaged stands were order as severe>moderate>slight damage. The rates of nitrification were significantly increased for the moderately and severely damaged stands after the snow storm. The nitrification rates in the moderately and severely damaged stands accounted for 63.7% and 70.6% of net N mineralization rate, while 56.8% in the slightly-damaged stand. The results of regression analysis showed that the annual mean rates of N mineralization and nitrification were significantly and positively correlated to soil temperature, available N and dissolved organic N contents (P<0.05). Our finding indicated that the soil N biogeochemical processes were significantly altered by the severe disturbance of glaze and snow-storm, with a significant increase in nitrification and N loss in forest ecosystems.
Key words: silviculture; glaze and snow storm; N mineralization; soil microbial biomass; available nitrogen; plantation
发表期数: 2014年10月第19期
引用格式: 谢昕云,赵竑绯,施文涛,等. 特大冰雪害后杉木人工林土壤氮素矿化特点[J]. 中国科技论文在线精品论文,2014,7(19):1900-1906.
 
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