干旱区生态环境知识资源中心(Arid): 腾格里沙漠东南缘生物结皮土壤呼吸对水热因子变化的响应

Arid

	腾格里沙漠东南缘生物结皮土壤呼吸对水热因子变化的响应
其他题名	Responses of soil respiration with biocrust cover to water and temperature in the southeastern edge of Tengger Desert, Northwest China
	管超; 张鹏; 李新荣
来源期刊	植物生态学报
ISSN	1005-264X
出版年	2017
卷号	41 期号:3 页码:301-310
中文摘要	生物结皮土壤呼吸是干旱区碳循环的重要参与者,是了解荒漠生态系统碳循环的重要过程之一,但有关生物结皮土壤呼吸对水热因子的响应还存在许多不确定性,难以在区域尺度上准确评估生物结皮土壤系统碳排放对水热因子变化的响应及反馈方向和程度。该文以腾格里沙漠东南缘天然植被区藓类和藻-地衣结皮土壤为研究对象,利用开顶式生长室模拟增温,采用全自动土壤碳通量测定系统研究了模拟增温及降水格局变化对不同类型生物结皮土壤呼吸的影响。结果表明:观测期间(2016年4月1日到7月31日),不同自然降水事件下(降水量在0.3-30.0 mm间),藓类结皮土壤呼吸速率在-0.16-4.69 mumol·m~(-2)·s~(-1)之间变动,藻-地衣结皮土壤呼吸速率在-0.21-5.72 mumol·m~(-2)·s~(-1)之间变动。藓类结皮土壤呼吸速率平均为1.09 mumol·m~(-2)·s~(-1),高于藻-地衣结皮土壤呼吸速率的0.94 mumol·m~(-2)·s~(-1),是藻-地衣结皮土壤呼吸速率的1.2倍。生物结皮土壤呼吸在不同的降水事件下具有明显的时空异质性,且生物结皮土壤呼吸速率与降水量有显著正相关关系。对照下两类结皮土壤呼吸速率平均为1.24 mumol·m~(-2)·s~(-1),增温条件下为0.79 mumol·m~(-2)·s~(-1),增温显著降低了其呼吸速率,增温主要是通过加速土壤水分的散失而降低两类结皮土壤呼吸。大多数情况下,土壤温度和生物结皮土壤呼吸呈现类似的单峰曲线,但土壤温度峰值出现的时间滞后于生物结皮土壤呼吸峰值出现的时间,滞后时间一般为2 h。
英文摘要	Aims Soil respiration of the lands covered by biocrusts is an important component in the carbon cycle of arid, semi-arid and dry-subhumid ecosystems (drylands hereafter), and one of the key processes in the carbon cycle of drylands. However, the responses of the rate of soil respiration with biocrusts to water and temperature are uncertain in the investigations of the effects of experimental warming and precipitation patterns on CO_2 fluxes in biocrust dominated ecosystems. The objectives of this study were to investigate the relationships of carbon release from the biocrust-soil systems with water and temperature in drylands. Methods Intact soil columns with two types of biocrusts, including moss and algae-lichen crusts, were collected in a natural vegetation area in the southeastern fringe of the Tengger Desert. Open top chambers were used to simulate climate warming, and the soil respiration rate was measured under warming and non-warming treatments using an automated soil respiration system (LI-8150). Important findings Over the whole observational period (from April 2016 to July 2016), soil respiration rates varied from -0.16 to 4.69 mumol·m~(-2)·s~(-1) for the moss crust-covered soils and from -0.21 to 5.72 mumol·m~(-2)·s~(-1) for the algae-lichen crust-covered soils, respectively, under different rainfall events (the precipitations between 0.3-30.0 mm). The mean soil respiration rate of the moss crust-covered soils is 1.09 mumol·m~(-2)·s~(-1), which is higher than that of the algae-lichen crust-covered soils of 0.94 mumol·m~(-2)·s~(-1). The soil respiration rate of the two types of biocrust-covered soils showed different dynamics and spatial heterogeneities with rainfall events, and were positively correlated with precipitation. The mean soil respiration rate of the biocrust-covered soils without warming was 1.24 mumol·m~(-2)·s~(-1), significantly higher than that with warming treatments of 0.79 mumol·m~(-2)·s~(-1) (p < 0.05). By increasing the evaporation of soil moisture, the simulated warming impeded soil respiration. In most cases, soil temperature and soil respiration rate displayed a similar single-peak curve during the diel cycle. Our results show an approximately two hours lag between soil temperature at 5 cm depth and the soil respiration rate of the biocrust-covered soils during the diel cycle.
中文关键词	呼吸作用 ; 生物结皮 ; 降水格局 ; 模拟增温
英文关键词	respiration biocrust precipitation patterns stimulated warming
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:5963261
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236955
作者单位	中国科学院西北生态环境资源研究院,沙坡头沙漠研究试验站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	管超,张鹏,李新荣. 腾格里沙漠东南缘生物结皮土壤呼吸对水热因子变化的响应[J],2017,41(3):301-310.
APA	管超,张鹏,&李新荣.(2017).腾格里沙漠东南缘生物结皮土壤呼吸对水热因子变化的响应.植物生态学报,41(3),301-310.
MLA	管超,et al."腾格里沙漠东南缘生物结皮土壤呼吸对水热因子变化的响应".植物生态学报 41.3(2017):301-310.