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cje ›› 2012, Vol. 31 ›› Issue (06): 1373-1377.

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Effects of soil water stress on Linum usitatissimum emergence.

WANG Ping1, ZHANG Li-feng1,2**, LI Ming1   

  1. (1College of Agriculture, Agricultural University of Hebei, Baoding 071000, Hebei, China; 2Zhangbei Agricultural Resource and Ecological Environment Key Field Research Station, Ministry of Agriculture, Zhangjiakou 076450, Hebei, China)
  • Online:2012-06-09 Published:2012-06-09

Abstract: By the method of establishing artificial moisture gradient and based on completely controlling environment, an experiment was designed to study the relationships between soil water stress and flax (Linum usitatissimum) seedling emergence as well as the soil moisture critical value for the emergence resisting soil drought, aimed to ensure the springsowing crop seedlings safely in northern arid or semiarid regions of China. The responses of the emergence to soil moisture exhibited 3 types, i.e., jump, ascending, and S-curve. The moisturesensitive domain of the emergence was from 3.5% to 6.0% for sandy chestnut soil, and from 9.0% to 15.0% for meadow chestnut soil. Taking the emergence rate as a standard, the soil moisture threshold value was 5.5% for sandy chestnut soil, and 13.0% for meadow chestnut soil. With the drought-resistance and conserving seedling as the standard, the soil moisture threshold value was 5.0% for sandy chestnut soil, and the seeding level should be increased to 1.52 times of that in average years. When the soil moisture threshold value for meadow chestnut soil was 12.0%, the seeding level should be increased to 1.72 times of that in average years.

Key words: soil microbial community structure, PLFA, natural forest of Castanopsis fabri,  Cunninghamia lanceolata plantation.