干旱区生态环境知识资源中心(Arid): 雪被厚度对冻融过程中土壤CO

Arid

	雪被厚度对冻融过程中土壤CO_2短期排放的影响
其他题名	Effect of snow cover on short - term CO_2 emission from the soil in freeze - thaw cycles
	朱新萍 1; 贾宏涛 1; 古再丽努尔·艾买提 2; 赵成义3 ; 蒋平安 1
来源期刊	干旱区资源与环境
ISSN	1003-7578
出版年	2018
卷号	32 期号:10 页码:130-134
中文摘要	气候变化对全球中纬度地区降雪和雪被有着重要的影响,冬季土壤呼吸对区域和全球碳循环的贡献更为重要。本研究以干旱区典型高寒湿地和农田灰漠土为研究对象,冬季在室外模拟研究了雪被厚度和水分对两种类型土壤CO_2短期排放的影响,结果表明: (1)在干旱区不同有机碳含量土壤冻融循环过程中,雪被厚度的增加会影响土壤的CO_2排放特征;在冻融过程初期雪被厚度增加会导致土壤CO_2排放峰值出现滞后,在消融期CO_2排放量会明显增加,并随着冻融循环次数增加而逐渐减小。(2)土壤起始含水量的高低及雪被厚度对土壤CO_2短期排放速率及其与温度的关系具有直接影响。在起始土壤饱和含水量为20 - 30%条件下,农田HW1_0与HW1_(30)处理间CO_2平均排放速率差异显著(P < 0.05);当雪被厚度增加,两种土壤CO_2排放与地表、大气和5cm土层温度之间均呈现极显著正相关性(P < 0.01);在起始土壤饱和含水量为50 - 60%条件下,雪被厚度对农田和湿地土壤CO_2平均排放速率影响不显著(P > 0.05),然而在农田土壤雪被厚度30cm和湿地土壤雪被15cm处理下,CO_2排放与地表和5 cm土层温度呈现极显著正相关(P < 0.01),但受大气温度影响不显著。以上结果表明气候剧烈变化导致的季节性降雪雪被的变化会对干旱区不同土壤CO_2短期排放产生重要的影响。
英文摘要	Climate change has an important impact on snow and snow cover in the mid latitude region of the world,and the contribution of soil respiration to regional and global carbon cycles is more important in winter. The effects of snow cover and water content on the short - term CO_2 fluxes during freeze - thaw cycles were evaluated for the undisturbed soil columns of Typical Alpine Wetland and farmland grey desert soil outdoors in winter. Our results showed that the dynamics of soil CO_2 fluxes during the freeze - thaw cycles were affected by snow cover and soil organic carbon content. Soil CO_2 emissions generally enhanced during the first freeze - thaw cycle, and gradually decreased with successive cycles. The increase of snow cover thickness delayed the CO_2 emission peak in the early stage of freezing and thawing process. In addition,there was a significant difference in the average CO_2 emission rate between HW1_0 and HW1_(30) treatments (P < 0.05) under the condition of initial soil saturated water content of 20 - 30%,and when the snow thickness was increased,the CO_2 emission from two soils showed a significant positive correlation with the ground surface,the atmosphere and the temperature of 5cm soil layer respectively(P < 0.01). Snow cover thickness had no significant effect on the average CO_2 emission rate of farmland and wetland soil (P > 0.05) under the condition of initial soil saturated water content of 50 - 60%, However,CO_2 emission from farmland soil snow cover treated with 30cm and wetland soil snow cover treated with 15cm was significantly positively correlated with soil surface temperature and soil temperature at 5cm (P < 0.01),but not significantly affected by atmospheric temperature. The above results suggest that the seasonal change of the snow has an important impact on short - term soil CO_2 emissions in the arid area because of climate changes.
中文关键词	雪被 ; 冻融循环 ; 湿地土壤 ; 农田土壤 ; 温室气体
英文关键词	snow cover freeze - thaw cycles wetland soil farmland soil greenhouse gases
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:6319028
来源机构	中国科学院新疆生态与地理研究所 ; 新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237729
作者单位	1.新疆农业大学草业与环境科学学院;;新疆土壤与植物生态过程重点实验室, ;;新疆土壤与植物生态过程重点实验室, 乌鲁木齐;;乌鲁木齐, ;; 830052;;830052; 2.新疆农业大学草业与环境科学学院, 乌鲁木齐, 新疆 830052, 中国; 3.中国科学院新疆生态与地理研究所, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	朱新萍,贾宏涛,古再丽努尔·艾买提,等. 雪被厚度对冻融过程中土壤CO_2短期排放的影响[J]. 中国科学院新疆生态与地理研究所, 新疆农业大学,2018,32(10):130-134.
APA	朱新萍,贾宏涛,古再丽努尔·艾买提,赵成义,&蒋平安.(2018).雪被厚度对冻融过程中土壤CO_2短期排放的影响.干旱区资源与环境,32(10),130-134.
MLA	朱新萍,et al."雪被厚度对冻融过程中土壤CO_2短期排放的影响".干旱区资源与环境 32.10(2018):130-134.