| 1 | Natural vegetation of geological and historical periods in Loess Plateau显示文摘The study of natural vegetation of geological and historical periods in the Loess Plateau is an important scientific and practical issue for the development of north-western China. However, interpretation of the natural vege-tation before human reclamation is still controversial. The paper aims to analyze the potential factors that cause the difference in knowledge of Holocene natural vegetation de-veloping in different topographies of the Loess Plateau. The distribution of paleovegetation in this region shows signifi-cant difference among rocky mountains, valleys, and Yuan lands (the plain area), i.e. it does not follow the natural vege-tation zonation, as that in eastern China does. The Yuan lands with thick loess accumulation were never covered by a vast of dense forests during the Holocene. Forests (or open forests) developed preferably in valleys in the southern part of the Plateau and rocky mountains on the Plateau during the warm period of the Holocene. Some of local vegetation outside of the Loess Plateau are more subjected to the con-trol of geomorphology and ground water. | LuHouyuan LIUDongsheng GUOZhengtang | 2003 | Chinese Science Bulletin2003，48，5： | 11 |
| 2 | Discovery of C_4 species at high altitude in Qinghai-Tibetan Plateau显示文摘Plant specimens are collected from the areasbetween latitude 27°42′N and 40°57′N, and longitude 88°93′Eand 103°24′E, with an altitudinal range from 2210 to 5050 m above the sea level in Qinghai-Tibetan Plateau. The stable carbon isotope analysis indicates that two of Chenopodiaceae and six of Poaceae in the samples are C4 plants. Four of the C4 plants are found in 11 spots with altitudes above 3800 m,and Pennisetum centrasiaticum, Arundinella yunnanensis and Orinus thoroldii are present in six spots above 4000 m, evenup to 4520 m. At low CO2 partial pressure, that sufficient energy of high light improving C4 plant's tolerance of low temperature and precipitations concentrating in growing season probably are favorable for C4 plants growing at high altitude in Qinghai-Tibetan Plateau. | WANGLuo LUHouyuan WUNaiqin CHUDuo HANJiamao WUYuhu WUHaibin | 2004 | Chinese Science Bulletin2004，49，13： | 11 |
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