Soil seed banks of Achnatherum splendens steppes in the Qinghai Lake area

Abstract

Abstract: The study was conducted in the sheep breeding pasture-land of Sanjiao in Qinghai Province,which was located on the northern bank of Qinghai Lake.The germinated seed accumulation,density,amount,diversity of Achnatherum splendens communities,soil seed banks,and relationship between the vegetation and soil seed banks were studied and compared within and out of the fence.The results showed that the germination trend of soil seed banks was similar within and out of the fence,while the seed accumulation was different.The average density of germinationant seed within and out of the fence was 3660 seeds穖^-2 and 2460 seeds穖^-2.The number of seed accumulation was between 10³ and 10⁴ seeds穖^-2.Diversity indices of soil seed banks within and out of the fence were significantly different.Richness indices R1 and R2 within and out of the fence were 17 and 13,3.693 and 2.832,respectively.The change of diversity indices was the same as richness indices.Evenness indices E1 within and out of the fence were 0.812 and 0.857 respectively.The community composition within and out of the fence was significantly different.The diversity index change of vegetation was the same as the soil seed banks.

Key words: Wheat-cotton double cropping, Cotton, Rhizosphere and non-rhizosphere zones, Soil enzyme activity, Soil nutrient content

CLC Number:

Q948

ZHOU Guoying, CHEN Guichen, WANG Shunzhong, HAN Youji. Soil seed banks of Achnatherum splendens steppes in the Qinghai Lake area[J]. cje, 2005, (7): 724-728.

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