Effect of grazing rate on biomass and element composition of Xanthoparmelia camtschadalis

Abstract

Abstract: Xanthoparmelia camtschadalis is widely distributed in grassland area of Mongolian Plateau. There are few studies on the relationships between biomass,element composition and stocking rate.The relationships of biomass and element composition of Xanthoparmelia camtschadalis to grazing rates in Leymus chinensis steppe in Inner Mongolia were investigated.The results indicated that the biomass of the lichen was highest under light grazing,while the lowest under extremely overgrazing treatment.The C,N and Ca concentrations were higher than 1%,P,Mg,K and Fe were between 0.1% and 1%,and Na,Mn,Cu,Zn,and B were less than 0.1%.The Ca content in Xanthoparmelia camtschadalis was much higher than that in vascular plant.With an increasing grazing rate, the C concentration decreased,while N increased.The C/N ratio was the lowest under moderate and heavy grazing treatments.Ca,Mg,K,Fe,Mn and Cu contents were higher under grazing treatments.The changes of biomass and element composition of Xanthoparmelia camtschadalis had a good response to grazing rate,and hence,it was a good indicator to indicate the healthy condition and changes of biogeochemistry cycles in grassland ecosystems.

Key words: Xanthoparmelia camtschadalis, Biomass, Element composition, Grazing rates, Indicator, low nitrogen stress, growth, cucumber, purified humic acid, nutrient absorption.

CLC Number:

Q146

LI Xiangzhen, XING Xuerong, CHEN Zuozhong. Effect of grazing rate on biomass and element composition of Xanthoparmelia camtschadalis[J]. Chinese Journal of Applied Ecology, 2001, 12(3): 369-373.

References

[1] Brodo IM. 1973. Substrate Ecology. In:Ahrnadjian V and Hale ME eds. The Lichens. New York and London:Academic Press. 401～436

[2] Chen Z-Z(陈佐忠),Huang D-H(黄德华),Zhang H-F(张鸿芳).1985. The characteristics of element chemistry of 122 plants in the Xilin River Valley, Inner Mongolia. Research on Grassland Ecosystem.Vol 1(草原生态系统研究第一集). Beijing:Science Press. 112～131( in Chinese)

[3] Eldridge DJ. 1996. Distribution and floristic of terricolous lichens in soil crusts in arid and semi-arid New South Wales, Australia. Aust J Bot,44:581～599

[4] Kyrgys CS. 1997. Productivity of dry steppe using as winter-season pasture. In:V UVS-NOOR International Symposium Reports, Krxy,Russia, SLOVO, Russia, 80～83

[5] Li X-Z(李香真),Chen Z-Z(陈佐忠).1997. Nitrogen loss and management in grazed ecosystem. Clim Environ Res (气候与环境研究),2(3):241～250(in Chinese)

[6] Li X-Z(李香真),Chen Z-Z(陈佐忠).1998. Effects of different stock rates on C, N and P contents in soil-plant systems in Leymus chinensis steppe. Acta Agrestia Sin(草地学报),6(2):90～98(in Chinese)

[7] Li Y-H(李永宏). 1988. Research on the grazing degradation model of the main steppe rangeland in Inner Mongolia and some considerations for the establishment of a computerized rangeland monitoring system.Acta Phytoecol et Geobot Sin(植物生态学和地植物学报),12(3):189～196(in Chinese)

[8] Li Y-H(李永宏)1992. Accordance of the grassland dynamics on temporal gradient of restoration succession to their changes on spatial gradient of grazing. Research on Grassland Ecosystem. Vol 4(草原生态系统研究第四集).Beijing:Science Press. 1～8(in Chinese)

[9] Li Y-H(李永宏).1994. Research on the grazing degradation model of the main steppe rangeland in Inner Mongolia and some considerations for the establishment of a computerized rangeland monitoring system.Acta Phytoecol Sin(植物生态学报),18(1):68～79(in Chinese)

[10] Rogers. 1971. Distribution of the lichen Chondropsis semiviridis in relation to its heat and drought resistance. New Phytol, 70:1069～1077

[11] Titlyanova A, Rusch G, Van Der Maarel E. 1988. Biomass structure of limestone grasslands on Oland in relation to grazing intensity. ActaPhytogeogr Suecica, 76:125～134

[12] Tong way DJ. 1994. Rangeland Soil Condition Assessment Manual.Canberra, Australia:CSIRO Division Wildlife and Ecology. 1～25

[13] Wang S-P(汪诗平),Li Y-H(李永宏)1997. The influence of different stocking rates and grazing periods on the amount of feces and its relationship to DM intake and digestibility of grazing sheep. Acta Zoonutri Sin(动物营养学报),9:47～54 ( in Chinese)

[14] Wang S-P(汪诗平),Ii Y-H(李永宏).1999. Degradation mechanism of tvpical grassland in Inner Mongolia. Chin J AppI Ecol(应用生态学报),10(4):437～441(in Chinese)

[15] Wang W(王炜),Liu Z-I(刘钟龄),Hao D-Y(郝敦元)et al.1998. Research on the restoring succession of the degraded grassland in Inner Mongolia I. Basic characteristics and driving force for restoration of the degraded grassland. Acta Phytoecol Sin (植物生态学报),20(5):449～459(in Chinese)