Biomass allocation, relative competitive ability and water use efficiency of two dominant species in semiarid Loess Plateau under water stress

ISWC OpenIR > 水保所知识产出(1956---)

	Biomass allocation, relative competitive ability and water use efficiency of two dominant species in semiarid Loess Plateau under water stress
	Xu Bing-Cheng; Xu Wei-Zhou; Huang Jin; Xu, BC
	2011
发表期刊	PLANT SCIENCE
卷号	181 期号:6 特刊: SI 页码:644-651
摘要	A better understanding of the growth and interspecific competition of native dominant species under water stress should aid in prediction of succession in plant communities. In addition, such research would guide the selection of appropriate conservation and agricultural utilization of plants in semiarid environments that have not been very well characterized. Biomass production and allocation, relative competitive ability and water use efficiency of one C(4) herbaceous grass (Bothriochloa ischaemum) and one C(3) leguminous subshrub (Lespedeza davurica), both important species from the semiarid Loess Plateau of China, were investigated in a pot-cultivation experiment. The experiment was conducted using a replacement series design in which B. ischaemum and L davurica were grown with twelve plants per pot, in seven combinations of the two species (12:0, 10:2, 8:4, 6:6, 4:8, 2:10, and 0:12). Three levels of water treatments included sufficient water supply (HW), moderate water stress (MW) and severe water stress (LW). These treatments were applied after seedling establishment and remained until the end of the experiment. Biomass production and its partitioning, and transpiration water use efficiency (TWUE) were determined at the end of the experiment. Interspecific competitive indices (competitive ratio (CR), aggressiveness (A) and relative yield total (RYT)) were calculated from the dry weight for shoots, roots and total biomass. Water stress decreased biomass production of both species in monoculture and mixture. The growth of L davurica was restrained in their mixtures for each water treatment. L davurica had significantly (P<0.05) greater root:shoot allocation than B. ischaemum for each water treatment and proportion within the replacement series. Aggressiveness (A) values for B. ischaemum with respect to L davurica were negative only at the proportions of B. ischaemum to L davurica being 8:4 and 10:2 in LW treatment. B. ischaemum had a significantly (P<0.05) higher CR value under each water treatment, and water stress considerably reduced its relative CR while increased that of L davurica. RYT values of the two species indicated some degree of resource complimentarity under both water sufficient and deficit conditions. The results suggest that it is advantageous for growing the two species together to maximize biomass production, and the suggested ratio was 10:2 of B. ischaemum to L davurica because of significantly higher (P<0.05) RYT and TWUE under low water availability condition. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
关键词	Bothriochloa Ischaemum Lespedeza Davurica Aggressivity Competitive Ratio Relative Yield Total Water Stress
收录类别	SCI
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/4669
专题	水保所知识产出(1956---)
通讯作者	Xu, BC
推荐引用方式 GB/T 7714	Xu Bing-Cheng,Xu Wei-Zhou,Huang Jin,et al. Biomass allocation, relative competitive ability and water use efficiency of two dominant species in semiarid Loess Plateau under water stress[J]. PLANT SCIENCE,2011,181(6 特刊: SI):644-651.
APA	Xu Bing-Cheng,Xu Wei-Zhou,Huang Jin,&Xu, BC.(2011).Biomass allocation, relative competitive ability and water use efficiency of two dominant species in semiarid Loess Plateau under water stress.PLANT SCIENCE,181(6 特刊: SI),644-651.
MLA	Xu Bing-Cheng,et al."Biomass allocation, relative competitive ability and water use efficiency of two dominant species in semiarid Loess Plateau under water stress".PLANT SCIENCE 181.6 特刊: SI(2011):644-651.

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