Biomass production and relative competitiveness of a C(3) legume and a C(4) grass co-dominant in the semiarid Loess Plateau of China

CORC > 水土保持研究所 > 中国科学院水利部水土保持研究所 > 水保所知识产出(1956-2013)

	Biomass production and relative competitiveness of a C(3) legume and a C(4) grass co-dominant in the semiarid Loess Plateau of China
	Xu Bingcheng ; Xu Weizhou ; Huang Jin
刊名	PLANT AND SOIL
	2011
卷号	347 期号:1-2 特刊: SI 页码:25-39
关键词	Aggressivity Bothriochloa ischaemum Competitive ratio Lespedeza davurica Relative yield total Water use efficiency
通讯作者	Xu, BC
英文摘要	Bothriochloa ischaemum L. and Lespedeza davurica (Laxm.) Schindl. are two co-dominant species of great importance in reducing soil and water loss and maintaining the distinctive natural scenery of the semiarid Loess Plateau of China. Our aim was to determine the growth and interspecific competition between these species under water stress to facilitate the prediction of community succession and guide the selection of appropriate methods of conservation and use in the area. A pot experiment was designed to investigate the effects of water stress and competition on biomass production and allocation, relative competitive ability and water use efficiency of the two species. Bothriochloa ischaemum (a C-4 perennial herbaceous grass) was planted in the same pot with L. davurica (a C-3 perennial leguminous subshrub) at density ratios of 12: 0, 10: 2, 8: 4, 6: 6, 4: 8, 2: 10, and 0:12. The response of the species to their mutual presence at the different ratios was evaluated at three levels of soil moisture (80%+/- 5% field capacity, FC (HW), 60%+/- 5% FC (MW) and 40%+/- 5% FC (LW)). Indices of aggressivity (A), competitive ratio (CR) and relative yield totals (RYTs) were calculated from the dry shoot, root and total weight data. Water stress decreased the biomass production by both species whether in monoculture or mixture, but B. ischaemum was more sensitive to water deficit. Across moisture levels, the growth of L. davurica was more adversely affected by mixed planting. Bothriochloa ischaemum had significantly (P<0.05) smaller root: shoot ratios than L. davurica and the root mass of both species tended to increase relative to shoot mass as soil water deficit increased. The aggressivity (A), competitive ratio (CR) and relative yield totals (RYTs) of B. ischaemum were positive across treatments. Bothriochloa ischaemum had much higher CR under each water treatment, but water stress considerably reduced its relative CR while increasing that of L. davurica. The RYT values of the two species indicated some degree of resource complimentarity under both water sufficient and deficit conditions. Our results suggest that it is advantageous to grow the two species together to maximize biomass production. We recommend a mixture ratio of 8: 4 of B. ischaemum to L. davurica because it gave significantly higher RYT and transpiration water use efficiency under deficit water conditions.
收录类别	SCI
语种	英语
公开日期	2012-05-29
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/4682]
专题	水土保持研究所_水保所知识产出(1956-2013)
推荐引用方式 GB/T 7714	Xu Bingcheng,Xu Weizhou,Huang Jin. Biomass production and relative competitiveness of a C(3) legume and a C(4) grass co-dominant in the semiarid Loess Plateau of China[J]. PLANT AND SOIL,2011,347(1-2 特刊: SI):25-39.
APA	Xu Bingcheng,Xu Weizhou,&Huang Jin.(2011).Biomass production and relative competitiveness of a C(3) legume and a C(4) grass co-dominant in the semiarid Loess Plateau of China.PLANT AND SOIL,347(1-2 特刊: SI),25-39.
MLA	Xu Bingcheng,et al."Biomass production and relative competitiveness of a C(3) legume and a C(4) grass co-dominant in the semiarid Loess Plateau of China".PLANT AND SOIL 347.1-2 特刊: SI(2011):25-39.