干旱区生态环境知识资源中心(Arid): 水氮耦合对荒漠草原植物物种多样性及生物量的影响

Arid

	水氮耦合对荒漠草原植物物种多样性及生物量的影响
其他题名	Effect of water and nitrogen interaction on plant species diversity and biomass in a desert grassland
	高海燕 1; 红梅 2; 霍利霞 1; 刘鹏飞 1; 常菲 1
来源期刊	草业科学
ISSN	1001-0629
出版年	2018
卷号	35 期号:1 页码:36-45
中文摘要	为了研究大气氮沉降和降水变化对荒漠草原物种多样性及地上、地下生物量的影响,设置自然降雨(CK) 、增雨30%(W)和减雨30%(R) 3个水分处理及0(N_0) 、30(N_(30)) 、50(N_(50))和100 kg·(hm~2·a)~(-1) (N_(100)) 4个氮素(NH_4NO_3)水平(其中不包括大气氮沉降),进行水氮交互试验。结果表明,1) CK * N和R * N处理下荒漠草原物种多样性随着施氮量增加,整体呈现先上升后下降的趋势,N_(30)水平达到最大,W * N处理下随着施氮量增加物种多样性显著降低(P < 0.05) 。2)对比W * N_0处理,CK * N_0和R * N_0处理地上生物量显著增加(P < 0.05) 。水氮交互作用下,随着施氮量增加,CK * N和W * N处理有助于地上生物量显著增加(P < 0.05),R * N处理地上生物量有增加的趋势。水氮交互作用对一、二年生植物有显著影响(P < 0.05),地上生物量整体呈现(W * N) > (CK * N) > (R * N) 。3)不同水氮交互作用下,地下生物量随土层增加逐渐减少,主要集中在0-30 cm土层,W * N处理可促进根系向深层土壤生长。在CK * N和R * N处理下,随着施氮量增加,荒漠草原物种地下生物量整体呈现先上升后下降的趋势,W * N处理随着施氮量增加地下总生物量显著增加(P < 0.05) 。4) CK * N_(30)和R * N_(30)处理下,根冠比显著降低(P < 0.05) 。以上结果说明,荒漠草原植物物种多样性及生物量与水分及养分有密切关系。
英文摘要	To demonstrate the effects of atmospheric nitrogen deposition and precipitation on species diversity and biomass in desert grassland,we examined water and nitrogen interactions,using three levels of water treatment [natural precipitation (CK),increased precipitation 30% (W) and reduced precipitation 30% (R)] and four nitrogen(NH_4NO_3) levels: 0 (N_0),30 (N_(30)),50 (N_(50)),and 100 (N_(100)) kg·(hm~2·a)~(-1) (which does not include atmospheric nitrogen deposition). The following results were obtained: 1) The species diversity of desert grassland under CK * N and R * N treatments increased with an increase in nitrogen application rate,showing an initial increase trend and a subsequent decrease,with maximum diversity being attained with the N_(30) treatment. Under the W * N treatment,the species diversity was significantly reduced (P < 0.05) with an increase of nitrogen application rate. 2) The aboveground biomass obtained with CK * N_0 and R * N_0 treatments was significantly increased (P < 0.05) compared with the W * N_0 treatment. Under the water and nitrogen interaction,the aboveground biomass of CK * N and W * N treatments was significantly increased (P < 0.05) with an increase in nitrogen application rate. The water and nitrogen interaction had a significant effect on annual and biennial plants. The overall aboveground biomass trend was as follows: (W * N) >(CK * N) > (R * N). 3) Under the water and nitrogen interactions,the underground biomass decreased gradually with the depth of soil,and was mainly concentrated in the 0-30 cm. The W * N treatment promoted root extension into deeper soil. The biomass of desert grassland under CK * N and R * N treatments showed an initial increase trend and then a subsequent decrease with an increase of nitrogen application rate,and the underground biomass obtained with the W * N treatment showed a significant increase (P < 0.05). 4) The treatments of CK * N_(30) and R * N_(30) significantly reduced the root /shoot ratio (P < 0.05). Collectively,the results of this study showed that the plant species diversity and biomass in desert grassland are closely related to water and nutrients.
中文关键词	氮沉降 ; 增雨减雨 ; 物种多样性 ; 地上生物量 ; 地下生物量
英文关键词	nitrogen deposition increased of reduced precipitation species diversity aboveground biomass underground biomass
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:6192729
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/2XILL650/237310
作者单位	1.内蒙古农业大学草原与资源环境学院, 呼和浩特, 内蒙古 010011, 中国; 2.内蒙古农业大学草原与资源环境学院;;内蒙古自治区土壤质量与养分资源重点实验室, ;;内蒙古自治区土壤质量与养分资源重点实验室, 呼和浩特;;呼和浩特, 内蒙古;;内蒙古 010011;;010011, 中国
推荐引用方式 GB/T 7714	高海燕,红梅,霍利霞,等. 水氮耦合对荒漠草原植物物种多样性及生物量的影响[J]. 内蒙古农业大学,2018,35(1):36-45.
APA	高海燕,红梅,霍利霞,刘鹏飞,&常菲.(2018).水氮耦合对荒漠草原植物物种多样性及生物量的影响.草业科学,35(1),36-45.
MLA	高海燕,et al."水氮耦合对荒漠草原植物物种多样性及生物量的影响".草业科学 35.1(2018):36-45.