亚热带典型林分对表层和深层土壤可溶性有机碳、氮的影响

发布时间：2018-03-09 15:55

本文选题：森林类型　切入点：可溶性有机质　出处：《应用生态学报》2016年04期 　论文类型：期刊论文

【摘要】：林分类型是影响土壤可溶性有机碳、氮库大小的重要因素,但目前对其研究主要集中在表层土壤(0~10 cm).本研究以亚热带地区天然林、毛竹林、格式栲人工林和杉木人工林为对象,用3种不同的浸提方式(冷水、热水和KCl溶液)提取表层(0~10 cm)和深层(40~60 cm)土壤中可溶性有机碳(DOC)和有机氮(DON),研究林分类型对表层和深层土壤可溶性有机碳、氮库的影响.结果表明:林分类型对表层土壤DOC及其占土壤总有机碳(TOC)的比重有显著影响,深层土壤受林分类型的影响不显著;不同林分土壤DON含量仅在表层土壤存在显著差异,在深层土壤差异不显著.林分间土壤微生物生物量碳的差异仅在表层土壤达到显著水平.DON占土壤总氮(TN)的比重在各林分表层和深层土壤间差异均不显著.3种浸提方法得到的DOC和DON库大小顺序为热水KCl冷水,不同浸提方法得到的DOC库及DON库的相关性均达到显著水平,表明冷水、热水和KCl溶液浸提得到的有机碳、氮库含有相似组分.冷水和热水浸提方法得到的表层土壤DOC和DON含量及DOC占TOC比重在天然林和毛竹林均显著大于格式栲和杉木人工林,表明天然林和毛竹林土壤可溶性有机碳、氮含量高于格式栲和杉木人工林,更有利于土壤肥力的恢复.
[Abstract]:Stand type is an important factor affecting the size of soil soluble organic carbon and nitrogen pool, but at present, the study is mainly focused on the surface soil of 10 cm ~ (10 cm). In this study, natural forest, Phyllostachys pubescens forest, plantations of Castanopsis fargesii and Chinese fir plantation in subtropical region were studied. Three different extraction methods (cold water, hot water and KCl solution) were used to extract soluble organic carbon (DOC) and organic nitrogen (DOC) from topsoil (10 cm) and deep layer (40 ~ 60 cm). The effects of stand types on soluble organic carbon (SOC) in topsoil and deep soil were studied. The results showed that stand type had a significant effect on the proportion of DOC in topsoil and its proportion to soil total organic carbon (TOC), but the deep soil was not affected by stand type. The DON content of different stand soils was significantly different only in the surface soil. The difference of soil microbial biomass carbon between stands reached significant level only in the surface soil. Don accounted for the proportion of soil total nitrogen and TNN. There was no significant difference in 3 kinds of extraction between different stand surface and deep soil. The DOC and DON libraries were obtained in the order of hot water, KCl and cold water. The correlation between DOC library and DON library obtained by different extraction methods was significant, indicating that organic carbon was extracted from cold water, hot water and KCl solution. The contents of DOC and DON in surface soil and the proportion of DOC to TOC in natural forest and Phyllostachys pubescens forest were significantly higher than those in normal Castanopsis fargesii and Cunninghamia lanceolata plantation, which indicated that the soil soluble organic carbon of natural forest and Phyllostachys pubescens forest was higher than that of Chinese fir plantation. Nitrogen content was higher than that of Castanopsis fargesii and Cunninghamia lanceolata plantation, which was more favorable for soil fertility recovery.
【作者单位】：湿润亚热带山地生态国家重点实验室培育基地;福建师范大学地理科学学院;福建农林大学林学院;
【基金】：国家自然科学基金项目(41371269) 国家重点基础研究发展计划项目(2014CB954003) 福建省杰出青年科学基金项目(2060203)资助~~
【分类号】：S714.2

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