| Effects of sowing depth and seed source on seedling emergence of Leymus chinensis |
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| DOI：10.7606/j.issn.1000-7601.2007.05.14 |
| Key Words: Leymus chinensis sowing depth seed source seedling emergence seed ecology |
| Author Name | Affiliation | | LIU Gui-xia | College of Life Science Hebei University,Baoding,Hebei 071002,China；China Agricultural University／Key Laboratory of Grassland Vegetation Restoration and Reconstruction MOA, Beijing 100094,China | | HAN Jian-guo | ；China Agricultural University／Key Laboratory of Grassland Vegetation Restoration and Reconstruction MOA, Beijing 100094,China | | ZHAO Xia | Agricultural College of Ningxia University,Yinchuan,Ningxia750021,China |
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| Abstract: |
| In this paper,two seed sources(wild and cultivar) and five different sowing depths were used to study their effects on L.chinensis emergence.It may help to provide some practical management regimes for degraded grassland restoration and reconstruction.The results indicated that both the sowing depth and seed source had significant influence on L.chinensis seedling emergence(P<0.01),emergence rate and emergence time.The emergence percentage and rate declined as the sowing depth increased.The optimal sowing depth was 1～2 cm for the two seed sources L.chinensis. The highest emergence percentage for wild and cultivar L.chinensis was 84% and 91%,respectively,at 1cm sowing depth;the emergence percentage was the lowest to 6cm earth up,was 33% and 24.25%,respectively.The difference between them was 3～4 times.Both seeds of wild and cultivar L.chinensis could not emerge from sowing depth at 8cm.The highest emergence rate occurred at 1 cm depth,was 6.46(wild) and 8.46(cultivar),respectively;and the emergence rate was lowest at 6cm sowing depth(2.41,wild;1.65,cultivar).In general,the seedling emergence percentage and rate of cultivar's L.chinensis was higher than wild L.chinensis,while to 4～6 cm earth up,it got the contrary tendency.Too deep sowing depth or surface-sown delayed the first seedling emergence time.For the surface-sown treatment,the first emergence time was 21～21.25 d.However,at 1～2 cm depth,the first emergence time was 9-10d.Thus the control of sowing depth is critical in the restoration sites and,at times,may be more important than seed source. |
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