干旱区生态环境知识资源中心(Arid): 模拟CO_2浓度升高和降雨量变化对红砂生物量分配及碳氮特征的影响

Arid

	模拟CO_2浓度升高和降雨量变化对红砂生物量分配及碳氮特征的影响
其他题名	Influence of elevated CO_2 and precipitation regimes on biomass allocation and carbon and nitrogen content characteristics of Reaumuria soongorica
	种培芳; 刘晟彤; 姬江丽; 李毅
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:6 页码:2065-2073
中文摘要	以荒漠优势植物红砂2年生苗木为试材,采用盆栽试验和开顶式CO_2控制气室模拟CO_2浓度变化(350mumol/mol和700mumol/mol)研究了红砂生物量分配及碳氮特征对降水变化减少30%、减少15%、自然降水、增加15%和增加30%(-30%、 -15%、0、15%、30%)的响应。结果表明:(1)CO_2浓度上升显著性的促进红砂地上茎叶和地下的根生物量,降雨量增加或减少也显著性的促进或抑制了这一作用;CO_2倍增时,红砂的地上生物量在降水增加30%时平均增加了61.28%(P<0.05),而根生物量在降水增加或减少30%时均分别增加了84%(30%)和3.21%(-30%),这种响应导致红砂根冠比在降水减少时大于降雨量增加时,CO_2倍增显著地抑制了这一作用。(2)CO_2浓度上升显著性地促进了红砂根、茎、叶中的碳含量,显著性地抑制了红砂根、茎、叶中氮含量,降雨量增加或减少也显著性的促进或抑制了这一作用;这种响应导致红砂根、茎、叶的C/N在降雨减少30%时增加80.22%(根)、103.02%(茎)和199.88%(叶) (P< 0.05),在降雨增加30%时增加24.99%(根)、30.27%(茎0)和104.45%(叶)(P<0.05),CO_2浓度倍增显著性地促进了这一作用。(3)以上结果表明,未来全球CO_2浓度升高时,在降雨量增加地区红砂因充足的碳源和水分而得以恢复;在降雨减少的地区,CO_2的升高对降雨减少造成的干旱胁迫有一定的补偿作用,红砂则以较高的根冠比来维持其在荒漠生态系统中地位。
英文摘要	Atmospheric CO_2 concentrations are predicted to increase from approximately 350mumol/mol today to over 700mumol/mol in the late 21th century. In the future,elevated CO_2 levels are likely to have profound effects on precipitation. This change would seriously affect the desert ecosystem,above- and belowground biomass,and carbon and nitrogen allocations of desert plants,leading to changes in ecosystem structure and function. Although many studies have examined the effects of precipitation and CO_2,the interactions between changing precipitation and CO_2 on desert plants have attracted little attention to date. A pot experiment was conducted to study the interaction of elevated CO_2 concentration and changing precipitation with biomass allocation,and carbon and nitrogen content characteristics in roots,stem,and leaf of Reaumuria soongorica,a dominant species of the desert steppe in the arid region of China,in order to assess the possible effect of global climate change on desert ecosystems. The main plot included two CO_2 concentrations (350 and 700mumol/mol) and five precipitation conditions(natural precipitationas control [0],precipitation minus 30% [-30%],precipitation minus 15% [-15%],precipitation plus 15% [15%],precipitation plus 30% [30%]). The results showed that: (1) aboveand belowground biomass of R. soongorica were increased significantly with elevated CO_2,and this effect was promoted or inhibited when precipitation increased or decreased,respectively; When the CO_2 concentration was increased from 350 to 700mumol/mol,the aboveground biomass increased by 61.28%with precipitation plus 30%(P<0.05),whereas root biomass was increased by an average 84%with precipitation 30%,and 3.21%with precipitation - 30%,respectively (P < 0.05); Therefore,the root/shoot ratio (R/S) of R. soongorica with precipitation plus was greater than that with precipitation minus,and this effect was significantly inhibited by elevated CO_2 (P<0.05).(2) Elevated CO_2 significantly increased the carbon content in the root,stem,and leaf of R. soongorica,and significantly decreased nitrogen content in those organs; this effect was promoted or inhibited with precipitation plus or minus. The C/N ratio of the root,stem,and leaf of R. soongorica increased by 80.22% (root),103.02% (stem) and 199.88% (leaf) with precipitation 30% (P < 0.05), whereas,the C/N ratio of those organs increased by 24.99% (root),30.27% (stem),and 104.45% (leaf) (P<0.05) with precipitation -30%,and elevated CO_2 significantly promoted the effect (P<0.05).(3) These results suggested that, under future conditions of elevated CO_2,R. soongorica would be restored due to sufficient carbon and water resources in the area where precipitationis increased; Whereas,in areas where precipitation is decreased,R. soongorica would retain its dominant position for the high root/shoot ratio,because there would be compensation of elevated CO_2 to drought stress.
中文关键词	CO_2浓度升高 ; 降雨量变化 ; 生物量分配 ; 碳氮比 ; 红砂
英文关键词	elevated CO_2 concentration precipitation biomass allocation C/N ratio Reaumuria soongorica
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6220770
来源机构	甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238113
作者单位	甘肃农业大学林学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	种培芳,刘晟彤,姬江丽,等. 模拟CO_2浓度升高和降雨量变化对红砂生物量分配及碳氮特征的影响[J]. 甘肃农业大学,2018,38(6):2065-2073.
APA	种培芳,刘晟彤,姬江丽,&李毅.(2018).模拟CO_2浓度升高和降雨量变化对红砂生物量分配及碳氮特征的影响.生态学报,38(6),2065-2073.
MLA	种培芳,et al."模拟CO_2浓度升高和降雨量变化对红砂生物量分配及碳氮特征的影响".生态学报 38.6(2018):2065-2073.