干旱区生态环境知识资源中心(Arid): 干湿交替对半干旱区沙地樟子松人工林土壤C 和N 矿化速率影响

Arid

	干湿交替对半干旱区沙地樟子松人工林土壤C 和N 矿化速率影响
其他题名	Effects of drying-rewetting on soil C and N mineralization rates in Mongolian pine plantation in a semi-arid region
	范志平; 胡亚林; 黎锦涛; 曾德慧
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2015
卷号	34 期号:12 页码:3360-3367
中文摘要	在干旱/半干旱地区,土壤干湿交替是非常普遍的自然现象。近年来,随着极端降水和极端干旱气候事件增加,干湿交替对土壤C 和N 循环过程影响受到广泛重视。本研究以我国北方半干旱地区科尔沁沙地樟子松人工林为对象,模拟土壤干湿交替对土壤C 和N矿化速率影响及其延时效应。结果表明,土壤呼吸CO_2释放速率随土壤干旱化增加不断降低,干旱土壤重新湿润后,土壤呼吸速率能够迅速恢复到初始水平。与恒湿处理相比,干湿交替变化能够降低土壤呼吸CO_2释放累积量和土壤硝态氮含量; 而干湿交替处理土壤呼吸 CO_2释放累积量、土壤硝态氮含量和净硝化速率均显著高于恒干处理。在干湿交替结束后延时期间,土壤呼吸CO_2释放速率、累积释放量对干湿交替变化表现出延时性,而土壤净硝化速率在不同处理间差异不显著。研究表明,土壤水分是影响半干旱地区沙地樟子松人工林土壤C 和N 循环的重要环境因子,且土壤C 和N 矿化速率对土壤干湿交替变化的延时响应存在差异。
英文摘要	Drying-rewetting of soil is a common phenomenon in arid and semi-arid region. In recent years,the impacts of drying-rewetting events on soil C and N cycling have been given widely attention considering the increasing occurrences of extreme precipitation and drought. In this study,we used a laboratorial incubation method to study the responses of soil C and N mineralization rates to soil drying-rewetting and the time-delay effects in a Mongolian pine (Pinus sylvestris var. mongolica) plantation in Keerqin Sandy Land,a semi-arid region in northern China. We found that the soil CO_2 release rate gradually decreased with the increasing soil drought. How-ever,the soil respiration rate could recover to its original level when rewetting the drying soil. Soil cumulative CO_2 release and NO_3~- -N concentration were lower in drying-rewetting treatment compared to the wet treatment (keeping continuously moist conditions) ,but soil cumulative CO_2 release,NO_3~- -N concentration and net nitrification rate were higher than that in drought treatment(keeping continuously dry conditions) . During the delay stage,there were time-delay effects of soil drying-rewetting events on the soil CO_2 release rate and its accumulation,but not for the soil net nitrification rate. Our results indicated that soil water was an important environmental factor controlling soil C and N cycles,and different time-delay effects of soil drying-rewetting events exis-ted on soil C and N mineralization rates in the Mongolian pine plantation in the semi-arid region.
中文关键词	半干旱地区 ; 干湿交替 ; 土壤呼吸速率 ; 土壤N 矿化速率 ; 科尔沁沙地
英文关键词	semi-arid region drying-rewetting event soil respiration rate soil N mineralization rate Keerqing Sandy Land
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Fisheries
WOS研究方向	Fisheries
CSCD记录号	CSCD:5604138
来源机构	中国科学院沈阳应用生态研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233251
作者单位	范志平, 辽宁石油化工大学生态环境研究院, 抚顺, 辽宁 113001, 中国.; 胡亚林, 福建农林大学林学院, 福州, 福建 350002, 中国.; 黎锦涛, 中国科学院沈阳应用生态研究所, 中国科学院大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.; 曾德慧, 中国科学院沈阳应用生态研究所, 中国科学院大青沟沙地生态实验站, 沈阳, 辽宁 110016, 中国.
推荐引用方式 GB/T 7714	范志平,胡亚林,黎锦涛,等. 干湿交替对半干旱区沙地樟子松人工林土壤C 和N 矿化速率影响[J]. 中国科学院沈阳应用生态研究所,2015,34(12):3360-3367.
APA	范志平,胡亚林,黎锦涛,&曾德慧.(2015).干湿交替对半干旱区沙地樟子松人工林土壤C 和N 矿化速率影响.生态学杂志,34(12),3360-3367.
MLA	范志平,et al."干湿交替对半干旱区沙地樟子松人工林土壤C 和N 矿化速率影响".生态学杂志 34.12(2015):3360-3367.