干旱区生态环境知识资源中心(Arid): 黄土高原半干旱区典型草地生态系统CO

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	黄土高原半干旱区典型草地生态系统CO_2交换对刈割的响应
其他题名	Responses of ecosystem CO_2 exchange to clipping in a semi-arid typical grassland on the Loess Plateau
	张燕江 1; 邱莉萍 2; 高海龙 3; 刘建 4; 魏孝荣 3; 张兴昌 3
来源期刊	生态学报
ISSN	1000-0933
出版年	2020
卷号	40 期号:1 页码:336-344
中文摘要	草地生态系统碳循环在全球气候变化中扮演着重要的角色。刈割是实现草地资源合理利用的主要管理措施,但其对草地生态系统碳通量的影响过程和机理尚不清楚。以黄土高原半干旱区典型草地为研究对象,设计刈割和对照两种处理,于2013-2015年对生态系统碳通量各组分,土壤温度和水分进行了测定。结果表明:生态系统碳通量季节性变化均呈明显的单峰模式,以夏季最高,春秋季节最低,但不同组分峰值出现的时间有所不同。刈割使整个试验期土壤呼吸增加了17%,但对总初级生产力(GEP)、生态系统呼吸(Re)和净初级生产力(NEE)的影响不显著。GEP和NEE在正常降水年(2014)高于干旱年(2015),而且其对刈割的响应与降水年型有关。在正常降水年,刈割后GEP和NEE显著减低,而在干旱年显著增加。这些结果表明,降雨年际变化是造成半干旱草地生态系统碳通量变化的主导因素,而刈割增大了这一生态系统的土壤碳排放。
英文摘要	Grassland ecosystem plays an important role in global climate change.Clipping is an effective management practices to realize the rational utilization of grassland resources.However,the responses of grassland ecosystem CO_2 flux to clipping remain unknown.Here,we conducted a 3-year field experiment in a semi-arid typical grassland on the Loess Plateau to examine the effect of clipping on CO_2 flux.Ecosystem carbon dioxide flux components were measured,as well as soil temperature and moisture at the depth of 0-10 cm.The results showed that the seasonal dynamics of CO_2 flux presented a single peak pattern with the highest values in summer and the lowest values in spring and autumn.There was a slight difference in the timing of CO_2 flux peak.During across experimental period,clipping significantly increased soil respiration(Rs)by 17%,but had no significant effects on the gross primary productivity(GEP),ecosystem respiration(Re),and net ecosystem carbon absorption(NEE).The GEP,Re,and NEE in normal rainfall year(2014)were higher than those in dry year(2015).The response of the GEP and the NEE to clipping depended on rainfall type.There was a significant increase of the GEP and the NEE in dry year after clipping,while an opposite trend was found in normal rainfall year.These results suggested that CO_2 flux were mainly determined by the inter-annual rainfall in the semi-arid grassland ecosystems,and clipping could increase the soil CO_2 emission.
中文关键词	刈割 ; 草地 ; 土壤呼吸 ; 碳通量 ; 黄土高原
英文关键词	clipping grassland soil respiration carbon flux Loess Plateau
语种	中文
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6674487
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318409
作者单位	1.西北农林科技大学资源环境学院, 杨凌, 712100; 2.西北农林科技大学资源环境学院;;西北农林科技大学, ;;黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌;;杨凌, ;; 712100;;712100; 3.西北农林科技大学, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 杨凌, 712100; 4.西北农林科技大学动物科技学院, 杨凌, 712100
推荐引用方式 GB/T 7714	张燕江,邱莉萍,高海龙,等. 黄土高原半干旱区典型草地生态系统CO_2交换对刈割的响应[J]. 西北农林科技大学,2020,40(1):336-344.
APA	张燕江,邱莉萍,高海龙,刘建,魏孝荣,&张兴昌.(2020).黄土高原半干旱区典型草地生态系统CO_2交换对刈割的响应.生态学报,40(1),336-344.
MLA	张燕江,et al."黄土高原半干旱区典型草地生态系统CO_2交换对刈割的响应".生态学报 40.1(2020):336-344.