干旱区生态环境知识资源中心(Arid): 荒漠人工植被区典型生物土壤结皮的固碳模型研究

Arid

	荒漠人工植被区典型生物土壤结皮的固碳模型研究
其他题名	Study on the Carbon Fixation Model of Biological Soil Crusts in the Revegetated Desert Area
	黄磊; 张志山; 潘颜霞; 赵洋
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2013
卷号	33 期号:6 页码:1796-1802
中文摘要	生物土壤结皮(BSC)是荒漠生态系统组成和地表景观的重要特征,在荒漠系统碳的源-汇功能中发挥着重要的作用。本文以沙坡头人工植被区两种典型的BSC(苔藓结皮和藻类结皮)为研究对象,通过对土壤水分的连续测定,确定BSC光合和呼吸作用的有效湿润时间及其与土壤水分、温度和太阳辐射的关系,建立了土壤水分驱动下的固碳模型。以2012年5月1925日为例,计算了苔藓结皮和藻类结皮在试验期间的日固碳量,并估算了两类结皮的年际固碳量。结果表明:苔藓结皮和藻类结皮由于自身水文物理性质的差别显著影响到其下层土壤水分和温度的变化;降雨是BSC固碳活性的重要来源,并且苔藓结皮更容易受到非降雨水(如雾水、凝结水等)的影响而使其固碳潜力大于藻类结皮。初步估算苔藓结皮和藻类结皮的年固碳量分别可以达到33.33g·m~(-2)·a~(-1)和14.01g· m~(-2)·a~(-1),其中由非降雨水所引起的固碳量达到了6.58g·m~(-2)·a~(-1)和2.65g·m~(-2)·a~(-1),分别占到了全年固碳量的19.7%和18.9%。充分肯定了BSC在荒漠人工植被区碳汇的功能。
英文摘要	Biological soil crusts(BSC), which were significant compositions and features of desert ecosystems and arid landscapes, had played an important role in carbon source-sink exchange in the desert system. In this paper, two typical biological soil crusts(moss crusts and algae crusts)were chosen in a revegetated area of the Tengger Desert as our study materials and based on the long term continuous monitoring of soil moisture dynamics, the effective wetting time of photosynthesis and respiration were obtained and then its relationship with soil moisture, temperature and solar radiation were determined. Finally, a carbon fixation model of biological soil crusts driven by soil moisture was established. During our experimental period, through19-25 May 2012 for example, the daily carbon fixation of the moss crusts and algae crusts were calculated and the annual carbon fixation was extrapolated based on our model. Results showed that:moss crusts and algae crusts had significant effects on the dynamics of soil moisture and temperature because of their different hydrology physical property. Rainfall was the most important trigger for biological soil crust carbon fixation, but the moss crusts had a higher carbon input than the algae crusts because it could easily absorb the non-rainfall water (condensed moisture supply from fog or dew). Preliminary estimation of the annual carbon fixation from our model was 33. 33 g?m~(-2)?a~(-1) for moss crusts and 14.01 g?m~(-2)?a~(-1) for algae crust. The carbon fixation by non-rainfall water have reached 6. 58 g?m~(-2)?a~(-1) and 2.65 g?m~(-2)?a~(-1), respectively, accounted for 19. 7% and 18.9% of the annual total. Those results have affirmed the carbon sink by BSC in the desert revegetated area.
中文关键词	荒漠人工植被区 ; 生物土壤结皮 ; 固碳模型 ; 有效湿润时间
英文关键词	revegetated desert area biological soil crust carbon fixation model effective wetting time
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4995026
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230677
作者单位	中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	黄磊,张志山,潘颜霞,等. 荒漠人工植被区典型生物土壤结皮的固碳模型研究[J]. 中国科学院西北生态环境资源研究院,2013,33(6):1796-1802.
APA	黄磊,张志山,潘颜霞,&赵洋.(2013).荒漠人工植被区典型生物土壤结皮的固碳模型研究.中国沙漠,33(6),1796-1802.
MLA	黄磊,et al."荒漠人工植被区典型生物土壤结皮的固碳模型研究".中国沙漠 33.6(2013):1796-1802.