Responses of Medicago sativa and Astragalus adsurgens seedlings growth and water use to soil moisture regime

Abstract

Abstract: In the semi-arid area of Loess Plateau,seasonal drought often occurs during the vegetative stage of grass plants,leading to the subsequent serious reduction of their yield.Aimed to study the responses of the seedlings growth and water use of two perennial leguminous grasses Medicago sativa and Astragalus adsurgens to different soil moisture regimes,a pot experiment was installed with five treatments,i.e.,adequate water supply (HW),moderate water stress (LW),soil drying gradually from HW (DHW) and LW (DLW),and refilling water to LW after soil drying from LW (RWL).The results showed that under HW,the seedlings of both M.sativa and A.adsurgens had the highest biomass and transpiration water use efficiency (TWUE),and M.sativa had a significantly higher biomass than A.adsurgens (P<0.05).When the soil moisture content declined,M.sativa had a higher reduction rate in biomass and TWUE than A.adsurgens,and after the soil moisture regime changed from LW and DLW to RWL,the biomass of M.sativa and A.adsurgens was reduced by 47.8% and 27.9%,respectively,as compared to LW (P<0.05).At the same time,the root/shoot ratio (R/S) of M.sativa and its water consumption per unit root increased significantly,while the TWUE decreased significantly(P<0.05); but for A.adsurgens,its R/S decreased significantly (P<0.05),while the TWUE and the water consumption per unit root had no significant change.

Key words: Medicago sativa, Astragalus adsurgens, Seedling growth, Soil moisture, Water consumption

CLC Number:

S152.7
S541

XU Bingcheng, SHAN Lun, LI Fengmin . Responses of Medicago sativa and Astragalus adsurgens seedlings growth and water use to soil moisture regime[J]. Chinese Journal of Applied Ecology, 2005, 16(12): 2328-2332.

References

[1]Bolger TP,Matches AG.1990.Water-use-efficiency and yield of sainfoin and alfalfa.Crop Sci,30:143～148
[2]Fan W-B(范文波),Liu H-F (刘换芳),Zhu B-R(朱保荣),et al.2003.Research on water-consuming law of Lucerne in abandoned land.J Soil Water Cons(水土保持学报),17(3):165～167(in Chinese)
[3]Gao JL,Terefeworkb Z,Chen WX,et al.2001.Genetic diversity of rhizobia isolated from Astragalus adsurgens growing in different geographical regions of China.J Biotechnol,91:155～168
[4]Grimes DW,Wiley PL,Sheesley WR.1992.Alfalfa yield and plant water relations with variable irrigation.Crop Sci,32:1381～1387
[5]Guo Z-G(郭正刚),Zhang Z-H(张自和),Xiao J-Y(肖金玉),et al.2002.Root system development ability of several alfalfa cultivars in the hilly and valley regions of Loess Plateau.Chin J Appl Ecol(应用生态学报),13(8):1007～1012(in Chinese)
[6]Hunt ER,Zakir JNJD,Nobel PS.1987.Water cost and water revenues for established and rain-induced roots of Agave deserti.Funct Ecol,1:125～129
[7]James FC.2002.Interactions between root and shoot competition vary among species.OIKOS,99:101～112
[8]Johnson RC,Tieszen LL.1994.Variation for water-use efficiency in alfalfa germplasm.Crop Sci,34:452～458
[9]Lauenroth WK,Sala OE,Milchunas DG,et al.1987.Root dynamics of Bouteloua gracilis during short-term recovery from drought.Funct Ecol,1:117～124
[10]Li Y-S(李玉山).2002.Productivity dynamic of alfalfa and its effect on water eco-environment.Acta Pedol Sin(土壤学报),39(3):404～411(in Chinese)
[11]Liang Y-M(梁一民),Li D-Q(李代琼),Cong X-H(从心海).1990.Study on the soil water and productivity of Astragalus adsurgens Pall.in Wuqi.Bul Soil Water Cons(水土保持通报),10(6):113～118(in Chinese)
[12]Ma J-Z(马建中),Yu H-B(鱼宏斌),Yi H-Y(伊虎英).2000.A few questions on radiation breeding for herbages.Acta Agric Nucleatae Sin(核农学报),14(3):167～173(in Chinese)
[13]Passioura JB.1983.Roots and drought resistance.Agric Water Man,7:265～280
[14]Ray IM,Townsend MS,Muncy CM.1999.Heritabilities and interrelationships of water-use efficiency and agronomic traits in irrigated alfalfa.Crop Sci,39:1088～1092
[15]Salter RM,Melton B,Wison M,et al.1984.Selection in alfalfa for forage yield with three moisture levels in drought boxes.Crop Sci,24:345～349
[16]Shan L(山仑),Chen G-L(陈国良).1993.The Theory and Practice of Dryland Farming on the Loess Plateau.Beijing:Science Press.115～144(in Chinese)
[17]Stephen OD.1986.Weed Physiology I.Reproduction and Ecophysiology.Boca Raton:CRC Press,Inc.119～122
[18]Volaire F.2003.Seedling survival under drought differs between an annual (Hordeum vulgare) and a perennial grass (Dactylis glomerata).New Phytol,160(3):501～510
[19]Xu B-C(徐炳成),Shan L(山仑).2003.A study comparing water use efficiency and root/shoot ratio of alfalfa and at seedling stage.Acta Agrestia Sin(草地学报),11(1):78～82(in Chinese)
[20]Yang W-Z(杨文治),Shao M-A(邵明安).2000.Study of Soil Water on the Loess Plateau.Beijing:Science Press.23～25(in Chinese)
[21]Yun L(云岚),Mi F-G(米福贵),Yun J-F(云锦凤),et al.2004.Drought resistance of six alfalfa varieties seedlings under water stress.Grassl China(中国草地),26(2):15～20(in Chinese)
[22]Wang YF,Wang SP,Cui XY,et al.2003.Effect of sulphur supply on the morphology of shoots and roots of alfalfa.Grass Forage Sci,58:160～167
[23]Wang Y-R(王彦荣),Zhang J-Q(张建全),Liu H-X(刘慧霞),et al.2004.Physiological and ecological responses of alfalfa and milkvetch seed to PEG priming.Acta Ecol Sin(生态学报),24(3):402～408(in Chinese)
[24]Zhang J-H(张建华),Wang Y-R(王彦荣).2004.Yield characteristics and genetic diversity of main alfalfa varieties in China.Chin J Appl Ecol(应用生态学报),15(5):803～808(in Chinese)
[25]Zhang N(张娜),Liang Y-M(梁一民).2002.Effect of arid climate on underground growth of Bothrichloa ischaemum community.Chin J Appl Ecol(应用生态学报),13(7):827～832(in Chinese)