RT Journal T1 MORPHOLOGICAL CHARACTERISTICS AND BIOMASS ALLOCATION OF LEYMUS CHINENSIS (POACEAE) (TRIN.) RESPONSES TO LONG-TERM OVERGRAZING IN AGRO-PASTORAL ECOTONE OF NORTHERN CHINA A1 Y. Zhang A1 X. Shao A1 C. Chen A1 Y. J. Zhang A1 K. Wang JF Journal of Animal and Plant Sciences JO JAPS SN 1018-7081 VO 23 IS 3 SP 934 OP 939 YR 2013 FD 2013/06/01 DO DOI NA AB

Overgrazing is the determinant factor to cause degradation and desertification of grazed grasslands in China. Leymus chinensis (Poaceae) (Trin.), the dominant grass in grassland of northern China, may exhibit distinctively strategies to survive under long-term overgrazing condition. In this study, we quantified its changes of morphological plasticity, biomass and biomass allocations when the long-term overgrazing activity was removed. A grazing-free plot and an overgrazed plot (without overgrazing stress during the experimental year) were established in the study area. Six quadrats were randomly selected in each plot for measurements. Results showed that when long -term overgrazing stress was removed, the number of vegetative shoot restored to normal level, while th e plant height, leaf number, leaf length and breadth, reproductive shoot number, and biomass were still at a lower level. And the biomass allocation patterns differed significantly (P<0.05) between tested treatments. After long-term overgrazing activity, L. chinensis allocated more biomass of total biomass to below-ground, less biomass of above-ground to reproductive shoots compared to L. chinensis under grazing-free condition. These modified morphological characteristics and biomass allocations were adaptive strategies of L. chinensis induced by overgrazing, and rapid recovery of vegetative shoot number was an occupational strategy of L. chinensis to restore.

K1 Leymus chinensis, overgrazing, morphological characteristics, biomass, biomass allocations, restore PB Pakistan Agricultural Scientists Forum LK https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-342