干旱区生态环境知识资源中心(Arid): 干扰对典型草原生态系统土壤净呼吸特征的影响

Arid

	干扰对典型草原生态系统土壤净呼吸特征的影响
其他题名	The response of net soil respiration to different disturbances in a typical grassland of northern China
	阚雨晨 1; 武瑞鑫 1; 钟梦莹 1; 王建勋 1; 蒲小鹏 2; 邵新庆 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2015
卷号	35 期号:18 页码:6041-6050
中文摘要	由于土地利用格局的改变和人类干扰活动的加剧,草地生态系统CO_2排放与固定的平衡、碳循环特征以及碳储量越来越受到人们的重视。尤其是定量区分土壤净呼吸与土壤总呼吸量之间的比例关系,以及定量描述草地生态系统碳循环过程等方面的研究尚不够完善。以河北沽源的典型草原为研究对象,测定了火烧、灌溉、施肥、刈割干扰下的天然草地土壤净呼吸变化动态及其与主要控制因素之间的关系。结果表明:不同处理土壤净呼吸均表现出明显的季节性变化规律,变化趋势基本一致。火烧、灌溉和刈割处理分别比对照的土壤净呼吸通量降低了28.93%、16.25%和36.82%。土壤温度、土壤湿度与土壤净呼吸通量呈指数相关(P<0.0l)。对地上生物量、地下生物量、土壤有机碳含量和土壤全氮含量与土壤净呼吸之间进行逐步回归分析表明,土壤有机碳含量(SC)和土壤全氮含量(SN)是土壤净呼吸通量的主要影响因素。
英文摘要	The release of carbon (С) in the biogeochemical cycle of grassland vegetation, soil, and the atmosphere mainly results from metabolism and respiration in roots, soil mineralization, and microbial activities. Soil temperature, soil moisture, above-ground biomass, below-ground biomass, soil nutrition, and microbiological composition can all affect soil respiration in grassland ecosystems. Fire has been identified as one of the most important factors controlling ecosystem processes and the С cycle. Soil nitrogen (N) availability influences plant growth, net primary productivity, and litter decomposition, all of which can affect the supply of С substrate for plant roots and soil microorganisms. Mowing, contrary to grazing, non-selectively affects all plants in a community by removing their above-ground biomass, traditionally only once or twice a year. Rainfall can affect the mineral composition of grasses. Correctly evaluating the effects of different disturbances on the grassland С cycle has contributed to understanding the effects of various management practices on grasslands. Soil net respiration plays an important role in regulating the responses of ecosystems and global С cycling to natural and anthropogenic disturbances. When total soil respiration is investigated, the net soil respiration flux is usually taken as a basis for measuring the net С release from grasslands to the atmosphere. Therefore, research on the quantitative distinction between net soil respiration and total soil respiration and quantitative descriptions of the С cycle processes of grassland ecosystems has imperfections. To address this, a grassland in the Hebei Guyuan national grassland ecosystem field scientific observation station was used as to investigate soil net respiration dynamics by the root exclusion method under irrigation, N fertilization, mowing, and burning, and in an undisturbed grassland from April 2011 to October 2012. The results showed consistent and obvious seasonal changes in soil net respiration under the different disturbances. Soil net respiration under all disturbance types was higher in late spring than in summer and lower in early spring and autumn. The soil net respiration rate under burning, irrigation, and mowing was decreased by 28.93%, 16.25%, 36.82%, respectively, compared with undisturbed grassland. The soil temperature and soil moisture were exponentially correlated with soil net respiration rate (P< 0.01). Regression analysis of the seasonal mean soil net respiration with above-ground biomass, below-ground biomass, soil organic С content, and soil total N contents demonstrated that soil organic С and total N content were the main influences on soil net respiration. Therefore, it was concluded that in the north temperate grassland area, soil temperature can better explain the inter-annual variability of soil net respiration than can soil moisture. The regulating action of soil moisture on soil net respiration should consider not only climate characteristics but also intra-zone water distribution. Soil organic С and total N content are crucial factors for soil net respiration. Under certain time-space conditions, soil net respiration under the disturbances was significantly different than in undisturbed grassland. Irrigation, N fertilization, mowing, and burning can all increase the С sequestration ability of grassland ecosystems. The different mechanisms by which irrigation, burning, mowing, and N fertilization were found to influence soil net respiration will facilitate the simulation and projection of ecosystem С cycling in the semi-arid grassland of northern China.
中文关键词	典型草原 ; 根去除法 ; 土壤呼吸 ; 干扰 ; 固碳能力
英文关键词	typical grassland root exclusion method soil respiration disturbance carbon sequestration ability
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5522097
来源机构	甘肃农业大学 ; 中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233200
作者单位	1.中国农业大学动物科技学院,草地研究所, 北京 100193, 中国; 2.甘肃农业大学草业学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	阚雨晨,武瑞鑫,钟梦莹,等. 干扰对典型草原生态系统土壤净呼吸特征的影响[J]. 甘肃农业大学, 中国农业大学,2015,35(18):6041-6050.
APA	阚雨晨,武瑞鑫,钟梦莹,王建勋,蒲小鹏,&邵新庆.(2015).干扰对典型草原生态系统土壤净呼吸特征的影响.生态学报,35(18),6041-6050.
MLA	阚雨晨,et al."干扰对典型草原生态系统土壤净呼吸特征的影响".生态学报 35.18(2015):6041-6050.