干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献

Arid

	古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献
其他题名	The Contribution of Soil Respiration to Ecosystem Respiration of Haloxylon ammodendron Community in the South of Gurbantunggut Desert
	杨洁; 刘冉; 马杰; 唐立松; 李彦
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:3 页码:726-733
中文摘要	土壤呼吸作为生态系统呼吸的主要贡献者,其贡献率往往超过50%,而干旱区土壤呼吸与生态系统呼吸的比值在季节上的变化尚不明确。利用涡度相关技术与多通道土壤呼吸观测技术,对古尔班通古特沙漠南缘的梭梭(Haloxylon ammodendron)群落生长季CO_2通量进行连续观测,探讨了土壤呼吸对生态系统呼吸的贡献及其在生长季变化特征。结果表明:(1)在整个生长季,生态系统呼吸呈单峰式变化,峰值出现在7月,为0.75 g·m~(-2)· d~(-1);最小值出现在3月,为0.09 g·m~(-2)·d~(-1);土壤呼吸在57月变化不大(0.34~0.51 g·m~(-2)·d~(-1)),7月底以后呈逐渐减小的趋势;(2)土壤呼吸与生态系统呼吸的比值(R_(soil)/R_(eco))在整个生长季为0.38~0.98,平均0.67;季节变化上总体呈U型,即生长季初期和末期较高,而生长季中期较低;(3)R_(soil)/R_(eco)与梭梭同化枝生物量显著负相关(R~2=0.458,P<0.05),说明随着梭梭同化枝生物量的增加,其对生态系统呼吸的贡献升高,导致了植物生长季中期R_(soil)/R_(eco)的下降。
英文摘要	Soil respiration (Rsoil)typically performs as the main contributors to the annual total ecosystem respiration (Reco)in ecosystem,but the seasonal variation of the R_(soil)/R_(eco)has not been investigated.The objective of this study was to investigate the characteristics of soil respiration and ecosystem respiration in a Haloxylon ammodendron community,located in the southern margin of Gurbantunggut Desert in western China. Special attention was paid on the seasonal variation of the R_(soil)/R_(eco).The results showed that:(1)The Reco was unimodal distribution during the whole growing season,the maximumRecowas 0.75 g·m~(-2)·d~(-1) and the minimum was 0.09 g·m~(-2)·d~(-1).The Rsoilwas little changed during May to July(0.34-0.51 g·m~(-2)·d~(-1)), and began decreasing since the end of July.(2)The R_(soil)/R_(eco)ranged from0.38 to 0.98,with an average of 0.67 across the whole growing season.On a seasonal basis,R_(soil)/R_(eco)presented an obvious" U" pattern:the value of R_(soil)/R_(eco)was 0.71 at the beginning of growing season;in the middle of growing season,the value of R_(soil)/R_(eco)reduced(about 0.43)as the plants into rapid growth period because of plants senesced;at the end of growing season,the R_(soil)/R_(eco)increased.(3)There was a significant linear correlation between the Rsoil/ Recoand biomass of H.ammodendronassimilating twigs(R~2=0.458,P<0.05),indicated that as the H.ammodendron growth,the contribution of H.ammodendronaboveground respiration(especially with leaf respiration) to Recoalso increased.
中文关键词	土壤呼吸 ; 生态系统呼吸 ; 二氧化碳通量 ; 涡度相关
英文关键词	soil respiration ecosystem respiration carbon dioxide flux eddy covariance
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:5743634
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235418
作者单位	中国科学院新疆生态与地理研究所阜康荒漠生态系统国家站, 荒漠与绿洲国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	杨洁,刘冉,马杰,等. 古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献[J]. 中国科学院新疆生态与地理研究所,2016,36(3):726-733.
APA	杨洁,刘冉,马杰,唐立松,&李彦.(2016).古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献.中国沙漠,36(3),726-733.
MLA	杨洁,et al."古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献".中国沙漠 36.3(2016):726-733.