干旱区生态环境知识资源中心(Arid): 农牧交错带半干旱草地生态系统CO

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	农牧交错带半干旱草地生态系统CO_2交换对短期不同水平氮添加的响应
其他题名	Short term effects on ecosystem CO_2exchange in a semi-arid grassland agro-pastoral ecotone,following differing levels of nitrogen application
	董斅晓 1; 薄元超 1; 孙建平 2; 张晓琳 1; 王常慧 3; 董宽虎 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2019
卷号	28 期号:5 页码:163-170
中文摘要	本研究以位于山西省右玉县农牧交错带的半干旱草地生态系统为研究对象,探究短期内不同水平的氮添加对半干旱草地生态系统CO_2交换的影响。试验设置8个梯度0、1、2、4、8、16、24和32g N·m~(-2)(分别表示为N_0、 N_1、N_2、N_4、N_8、N_(16)、N_(24)和N_(32))。采用静态箱法对草地净生态系统CO_2交换量(NEE)、生态系统呼吸(ER)进行测定,同时监测10cm表层土壤温度和含水量。试验结果表明:短期氮添加(N_(32)除外)显著增加农牧交错带半干旱草地生态系统净碳交换,NEE、ER和生态系统总初级生产力(GEP)在整个生长季均随氮素添加水平的上升呈单峰型变化趋势,在N_(16)和N_(24)处理下的生态系统CO_2交换达到最高,而N_(32)显著降低了NEE;不同氮添加水平下,ER和GEP相对NEE更为敏感;表层(0~10cm)土壤温度与含水量影响生态系统CO_2交换,表现为:土壤温度(10cm)与ER呈显著正相关(R~2>0.1,P<0.05),表层(0~10cm)土壤含水量与NEE和GEP分别呈显著正相关和显著负相关(R~2>0.1,P<0.05)。因此,短期不同水平氮添加增加了农牧交错带半干旱草地生态系统净碳吸收,对该地区草地生态系统碳的源/汇功能具有一定的参考意义。
英文摘要	This study investigated the short-term effects of different nitrogen(N)application rates in a semi-arid grassland ecosystem in an agro-pastoral ecotone in Youyu County,Shanxi Province,China.A randomized complete block experiment was set up with 8nitrogen levels(0,1,2,4,8,16,24,and 32g N·m~(-2),denoted N_0,N_1,N_2,N_4,N_8,N_(16),N_(24),N_(32),respectively),and 6replicates(48plots in total).Ecosystem net CO_2exchange(NEE)and ecosystem respiration(ER)under the different treatments were monitored using the static chamber method,with a fixed base for the portable chamber located in each plot before the start of the growing season,and chamber dimensions 50cm50cm50cm.Gross ecosystem CO_2capture was calculated from those primary data by difference,and was taken as gross ecosystem productivity(GEP).Nine measurements were undertaken at approximately two weekly intervals between June and September.Over this period, short-term N addition(except N_(32),which had a detrimental effect)significantly increased the net carbon uptake, with peak response seen in N_(16)and N_(24)treatments.The responses of ER and GEP to different N addition were more sensitive than NEE.There was a significant positive correlation between 10cm soil temperature and ER(R~2=0.319,P<0.0001),while the soil moisture for the upper 10cm was significantly positively correlated with NEE(R~2=0.420,P<0.0001)and was significantly negatively correlated with GEP(R~2=0.202,P= 0.0004).Therefore,short-term nitrogen addition increased the net carbon uptake of this semi-arid in the agropastoral ecotone,grassland ecosystem.Our study provides some reference data for grassland ecosystem carbon source/sink relationships in this region.
中文关键词	氮梯度 ; 农牧交错带 ; 半干旱草地 ; 生态系统CO_2交换
英文关键词	nitrogen addition levels agro-pastoral ecotone semi-arid grassland ecosystem CO_2exchange
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:6491331
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238978
作者单位	1.山西农业大学动物科技学院, 太谷, 山西 030801, 中国; 2.山西农业大学动物科技学院;;中国科学院植物研究所, ;;植被与环境变化国家重点实验室, 太谷;;, 山西;;北京 030801;;100093, 中国; 3.中国科学院植物研究所, 植被与环境变化国家重点实验室, 北京 100093, 中国
推荐引用方式 GB/T 7714	董斅晓,薄元超,孙建平,等. 农牧交错带半干旱草地生态系统CO_2交换对短期不同水平氮添加的响应[J]. 中国科学院植物研究所,2019,28(5):163-170.
APA	董斅晓,薄元超,孙建平,张晓琳,王常慧,&董宽虎.(2019).农牧交错带半干旱草地生态系统CO_2交换对短期不同水平氮添加的响应.草业学报,28(5),163-170.
MLA	董斅晓,et al."农牧交错带半干旱草地生态系统CO_2交换对短期不同水平氮添加的响应".草业学报 28.5(2019):163-170.