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中亚热带生物土壤结皮对土壤养分含量及N2O通量的影响

发表时间:2017-03-31  浏览量:1256  下载量:335
全部作者: 杨舟然,陈奶寿,王凯,陈仕东,陈岳民
作者单位: 福建师范大学地理科学学院,湿润亚热带山地生态国家重点实验室;青海铜业有限责任公司
摘 要: 以结皮覆盖土壤(soil covered by biological soil crusts,SCCs)和裸地土壤(bare soil,BS)(0~5 cm)为研究对象,通过室内恒温(25℃)培养,采用等压取样法,探究中亚热带地区生物土壤结皮(biological soil crusts,BSCs)对土壤养分含量以及氮保持的影响。结果表明,1)BSCs降低了其下层无机氮(inorganic nitrogen,IN)含 量 ,BS的NO3−-N含量显著高于结皮层下土壤(soils below crusts,SBCs)(P<0.01),BSCs增加了BSCs−土壤系统的养分含量;2)黑暗处理下SCCs的N2O排放通量高于BS(P<0.01),然而,光照处理及暗、光交替下SCCs的N2O通量表现为吸收,BS则表现为排放。总之,BSCs改善了BSCs−土壤系统的养分含量,降低了土壤氮损失的风险,有利于土壤的氮保持及杉木(Cunninghamia lanceolata)的生长。
关 键 词: 自然地理学;生物土壤结皮;土壤养分含量;N2O通量
Title: Effects of biological soil crusts on soil nutrient contents and N2O flux in mid-subtropics
Author: YANG Zhouran, CHEN Naishou, WANG Kai, CHEN Shidong, CHEN Yuemin
Organization: Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, College of Geographical Sciences, Fujian Normal University; Qinghai Copper Co., Ltd.
Abstract: To better understand the effects of biological soil crusts (BSCs) on soil nutrient contents and nitrogen retention in mid-subtropics. Soil covered by biological soil crusts (SCCs) and bare soil (BS) were collected intactly from surface soils of 0-5 cm depth and incubated in the laboratory at 25℃ by using equal pressure sampling method. The results showed that: 1) BSCs reduced inorganic nitrogen (IN) content in soils below crusts (SBCs), NO3−-N content in BS was signrficantly higher than that in SBCs (P<0.01), while BSCs enhanced soil nutrient contents of BSCs-soil system; 2) In dark condition, N2O emission flux in SCCs was higher than that in BS (P<0.01); however, N2O flux in SCCs showed absorption and that in BS was emission in light condition and alternation of day and night. Therefore, BSCs modify soil nutrient of BSCs-soil system and reduce soil nitrogen losses, which enhance nitrogen retention capacity and benefit the growth of Cunninghamia lanceolata.
Key words: natural geography; biological soil crusts; soil nutrient contents; N2O flux
发表期数: 2017年3月第6期
引用格式: 杨舟然,陈奶寿,王凯,等. 中亚热带生物土壤结皮对土壤养分含量及N2O通量的影响[J]. 中国科技论文在线精品论文,2017,10(6):681-689.
 
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