干旱区生态环境知识资源中心(Arid): 短花针茅(Stipa breviflora)叶片delta~(13)C对载畜率的响应

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	短花针茅(Stipa breviflora)叶片delta~(13)C对载畜率的响应
其他题名	Respons of Stipa breviflora Leaf delta~(13)C to Stocking Rates
	王亚婷; 赵天启; 王玺; 古琛; 陈万杰; 杜宇凡; 赵萌莉
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2017
卷号	26 期号:4 页码:613-619
中文摘要	叶片delta~(13)C值、养分含量等特征体现了植物为获取最大碳收获所采取的生存适应策略,同时delta~(13)C值还可以指示植物的长期水分利用效率,了解荒漠草原短花针植物的水分及资源利用策略有助于人们掌握其生长机制,对分析短花针茅应对干扰的生态对策有重要意义。采用稳定性碳同位素技术,通过测定荒漠草原短花针茅(Stipa breviflora)叶片稳定性同位素值(delta~(13)C),结合植物叶片碳(C)、氮(N)、碳氮比(C/N)、水分含量(LWC)等生理指标,探讨不同载畜率下短花针茅叶片的适应机理。结果表明,短花针茅叶片delta~(13)C值随放牧强度的增大而显著减小(P=0.041),其中对照处理为-26.8,轻度放牧处理为-27.2,中度和重度放牧处理分别为-27.4和-27.5,表明随着放牧强度的增大,植物的水分利用效率降低。随着放牧强度的增大,短花针茅叶片N质量分数增大(P=0.003),从对照到重度放牧处理依次为2.1%、2.3%、2.5%和2.7%; C质量分数减小,但不显著(P=0.076),从对照到重度放牧处理依次为46.3%、46.1%、46.1%和45.3%;C/N显著降低(P=0.004),对照到重度放牧处理依次为26.1%、20.7%、19.6%、18.5%,表明随着放牧干扰的增强,植物积累有机物质及资源利用能力下降。相关分析发现短花针茅叶片delta~(13)C值与N质量分数呈显著负相关(r=-0.690,P<0.05),与C质量分数、C/N呈显著正相关(r=0.565,r=0.668;P<0.01);叶片delta~(13)C值可指示植物有机物质的积累和资源利用能力。
英文摘要	The carbon stable isotope (delta~(13)C) value and nutrient content in plant leaves reflect the survival and adaption strategy of plants to absorb carbon maximum optimally. The long-term water use efficiency (WUE) of plant was indicated by the delta~(13)C value as well. The objective of this study was to assess the effect of different stocking rates on resource utilization of Stipa breviflora. The delta~(13)C,carbon (C),nitrogen (N),C/N ratio,water content (LWC) in leaves were determined to analyze the adaption mechanism. Results showed that: the delta~(13)C value in S. breviflora leaves reduced (P=0.041) as stocking rates increased,and they were -26.8,-27.2,-27.4,and -27.5 in control check (CK),light grazed (LG),moderate grazed (MG) and heavy grazed (HG),respectively. That also meant the WUE decreased with increasing stocking rates. The N percent in S. breviflora leaves elevated as stocking rates increased,and they were 2.1%,2.3%,2.5% and 2.7%,respectively. While the C percent in S. breviflora leaves were not observed differences (P=0.076) and they were 46.3%,46.1%,46.1% and 45.3% with increasing stocking rates. The C/N ratio in S. breviflora leaves were lowered (P=0.004) as stocking rates increased,and they were 26.1%,20.7%,19.6% and 18.5%,respectively. That meant organic matter accumulation and resource absorption of S. breviflora declined with increasing stocking rates. The delta~(13)C were negatively associated with N percent (r=-0.690,P<0.05) while positively related to C percent and C/N ratio (r=0.565,r=0.668; P<0.01). Leaf delta~(13)C values could indicate the accumulation of plant organic matter and resource utilization.
中文关键词	稳定性碳同位素 ; 荒漠草原 ; 放牧强度 ; 生理指标 ; 水分利用效率
英文关键词	stable carbon isotope desert steppe stocking rates physiological indices water use efficiency
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:6000855
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236403
作者单位	内蒙古农业大学草原与资源环境学院, 呼和浩特, 内蒙古 010019, 中国
推荐引用方式 GB/T 7714	王亚婷,赵天启,王玺,等. 短花针茅(Stipa breviflora)叶片delta~(13)C对载畜率的响应[J]. 内蒙古农业大学,2017,26(4):613-619.
APA	王亚婷.,赵天启.,王玺.,古琛.,陈万杰.,...&赵萌莉.(2017).短花针茅(Stipa breviflora)叶片delta~(13)C对载畜率的响应.生态环境学报,26(4),613-619.
MLA	王亚婷,et al."短花针茅(Stipa breviflora)叶片delta~(13)C对载畜率的响应".生态环境学报 26.4(2017):613-619.