干旱区生态环境知识资源中心(Arid): 荒漠植物白刺新固定碳在植物-土壤系统中的分配

Arid

	荒漠植物白刺新固定碳在植物-土壤系统中的分配
其他题名	Distribution of newly fixed carbon of Nitraria tangutorumin the plant-soil system
	李新乐 1; 鲍芳 2; 吴波 2; 曹艳丽 2; 刘明虎 3; 段瑞兵 3
来源期刊	草业学报
ISSN	1004-5759
出版年	2019
卷号	28 期号:2 页码:33-40
中文摘要	定量生长季内荒漠植物新固定碳在植物-土壤的分配规律,对理解全球碳循环有着重要意义。采用野外原位~(13)C-CO_2脉冲标记法,测定植物各器官及土壤~(13) C丰度值,比较不同标记时间段白刺新固定碳分配在不同器官、土壤和呼吸损失中的分配规律,并量化了白刺光合碳向地上、地下碳库的转移。结果表明:不同标记时间段内~(13) C-新固定碳在白刺叶、茎、根、土壤中的分配差异明显。在标记后1 h内,叶片和茎中~(13) C丰度值迅速上升到最高值,~(13)C丰度值分别达到520.1和592.5,比对照分别增加14和20倍,此后~(13) C丰度值随时间推移逐渐下降,直至趋于稳定;而标记后18 h在根系和土壤中发现被标记的~(13) C,~(13) C丰度值分别达到9.5和-23.8,白刺新固定碳经地上部呼吸和土壤呼吸损失量分别在标记1和18 h后达到最大。标记32 d后,白刺新固定碳在地上部和地下部~(13) C分配比例分别占35.59%和32.49%,呼吸损失(地上呼吸+土壤呼吸)占31.92%。荒漠植物白刺生长季年固碳量为2895.6 kg C·hm~(-2)·yr~(-1),表明白刺在荒漠生态系统碳循环中起着重要的碳汇作用。
英文摘要	Characterizing the carbon turnover in terrestrial ecosystems is critical for understanding and predicting carbon dynamics in ecosystems.We used in situ ~(13)C pulse labeling to track photosynthetic carbon fluxes of Nitraria tangutorumfrom shoot to root and soil in the Ulanbuh Desert.The objectives of this study were:1) To determine the transfer dynamics of newly photosynthesized carbon to different carbon pools including leaves, stems,roots,soil,and respiration.2)To quantify the allocation rate of newly fixed carbon among different carbon pools.3)to estimate the carbon budget of a N.tangutorumdesert ecosystem.It was found that the distribution of ~(13)C-newly fixed carbon in leaves,stems,and roots of N.tangutorumand in soil was significantly different in different labeling periods.The ~(13)C abundance value in leaves and stems rose rapidly to the highest value after labeling for 1 h,at which point the ~(13)C abundance value was 520.1and 592.5,14 and 20 times higher than the control,respectively.Thereafter,the ~(13)C abundance value gradually decreased with time until it stabilized.The labeled ~(13)C was found in the roots and soil after labeling 18 h,and the ~(13)C abundance values reached 9.5and-23.8,respectively.The amount of newly fixed carbon lost through shoot respiration and soil respiration reached a maximum after labeling for 1 hand 18 h,respectively.At the end of the labeling period,about 35.59%of labeled carbon was transferred to the shoots,16.67% was retained in root,31.92% was lost as respiration(shoot respiration+soil respiration)and 15.82%remained in the soil.In the three carbon pools,i.e.,shoot,root,and soil pools,shoots consistently had the highest proportion of ~(13)C in the plantsoil system during the 32 days.Based on the ~(13)C partitioning pattern and biomass production,we estimate a total of 2895.6 kg C·ha~(-1)·yr~(-1) was fixed by these desert plants during the vegetation growth season.This study suggests that N.tangutorumplays an important role in carbon sequestration in the carbon cycle of desert ecosystems.
中文关键词	荒漠植物 ; 新固定碳 ; 分配动态 ; 分配格局 ; 稳定同位素
英文关键词	desert plant newly fixed carbon distribution dynamics distribution pattern stable isotope
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:6427682
来源机构	中国林业科学研究院荒漠化研究所 ; 中国林业科学研究院沙漠林业实验中心
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238968
作者单位	1.中国林业科学研究院荒漠化研究所;;中国林业科学研究院沙漠林业实验中心, ;;内蒙古磴口荒漠生态系统国家定位观测研究站, ;;磴口, 北京;;内蒙古 100091;;015200, 中国; 2.中国林业科学研究院荒漠化研究所, 北京 100091, 中国; 3.中国林业科学研究院沙漠林业实验中心, 内蒙古磴口荒漠生态系统国家定位观测研究站, 磴口, 内蒙古 015200, 中国
推荐引用方式 GB/T 7714	李新乐,鲍芳,吴波,等. 荒漠植物白刺新固定碳在植物-土壤系统中的分配[J]. 中国林业科学研究院荒漠化研究所, 中国林业科学研究院沙漠林业实验中心,2019,28(2):33-40.
APA	李新乐,鲍芳,吴波,曹艳丽,刘明虎,&段瑞兵.(2019).荒漠植物白刺新固定碳在植物-土壤系统中的分配.草业学报,28(2),33-40.
MLA	李新乐,et al."荒漠植物白刺新固定碳在植物-土壤系统中的分配".草业学报 28.2(2019):33-40.