干旱区生态环境知识资源中心(Arid): 毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子

Arid

	毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子
其他题名	Diurnal Dynamic Characteristics and Influencing Factors of the Carbon Flux in Biocrusted Soil in Mu Us Sandland
	李炳垠; 卜崇峰; 李宜坪; 李新凯
来源期刊	水土保持研究
ISSN	1005-3409
出版年	2018
卷号	25 期号:4 页码:174-180
中文摘要	生物结皮是干旱半干旱地区重要的地表景观,它能够进行光合作用和呼吸作用,对荒漠生态系统的碳循环具有重要影响。研究以毛乌素沙地广泛分布的藓类、藻类结皮为研究对象,采用Li-8100土壤碳通量观测系统,探讨了不同类型生物结皮日变化特征及其与环境因子之间关系。结果表明:(1)生物结皮具有较高生理活性时,能够显著降低土壤CO_2通量,藓类结皮的土壤呼吸速率和光合速率均显著(p<0.01)高于藻类结皮。(2)生物结皮光合速率日变化趋势近似为双峰曲线,峰值出现在9:00,16:00左右;生物结皮土壤呼吸速率的日变化趋势呈单峰曲线,于12:00左右达到峰值。(3)相关分析表明,2 cm深度处的土壤含水量和空气湿度对生物结皮光合速率影响最为显著;2 cm处的土壤温度和含水量对生物结皮土壤呼吸速率影响最为显著。
英文摘要	Biocrust,a community of cyanobacteria,lichens,and mosses that live on the soil surface,is a critical part of land cover types in most arid and semi-arid regions. It can play a significant role in carbon fluxes and exchange in desert ecosystems through their own photosynthesis and respiration. In the present study, we used two dominant biocrust types (moss and algae) found in the Mu Us Sandland. The diurnal dynamic of soil carbon flux under the effects of biocrusts at different succession stages was measured by using a modified LI-8100 automated CO_2 flux system,and the effects of environmental factors on photosynthesis and respiration of biocrust were analyzed. The main results include: (1) the biocrust with physiological activity can significantly reduce CO_2 flux of soil and both the photosynthetic rate (P_n) and respiration rate (DR) of moss crust were significantly higher (p<0.01) than those of the algae crust; (2) the diurnal variation of photo-synthetic rate of biocrust was a typical bimodal curve,with the peaks appearing at 9:00 and 16:00; and the diurnal variation of soil respiration rate followed a single-peak curve,with the peaks appearing at 12:00;(3) the correlation analysis result indicated that the soil water content in the depth of 2 cm and air humidity had the most significant effect on the photosynthetic rate of the biocrust; the soil temperature and water content in the depth of 2 cm had the most significant effect on the respiration rate.
中文关键词	毛乌素沙地 ; 生物结皮 ; 土壤碳通量 ; 环境因子
英文关键词	Mu Us Sandland biocrust carbon flux environmental factors
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6240578
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238354
作者单位	李炳垠, 西北农林科技大学水土保持研究所, 杨凌, 陕西 712100, 中国.; 卜崇峰, 西北农林科技大学水土保持研究所;;中国科学院水利部水土保持研究所, ;;, 杨凌;;杨凌, 陕西;;陕西 712100;;712100, 中国.; 李宜坪, 西北农林科技大学水利与建筑工程学院, 杨凌, 陕西 712100, 中国.; 李新凯, 中国科学院水利部水土保持研究所, 杨凌, 陕西 712100, 中国.
推荐引用方式 GB/T 7714	李炳垠,卜崇峰,李宜坪,等. 毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子[J]. 西北农林科技大学,2018,25(4):174-180.
APA	李炳垠,卜崇峰,李宜坪,&李新凯.(2018).毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子.水土保持研究,25(4),174-180.
MLA	李炳垠,et al."毛乌素沙地生物结皮覆盖土壤碳通量日动态特征及其影响因子".水土保持研究 25.4(2018):174-180.