生物土壤结皮物理因子对植物种子萌发的影响

发布时间：2018-08-25 20:12

【摘要】：本研究采用冗余分析的方法,探讨了生物土壤结皮物理性质对小麦Triticum aestivum L.、黑豆Glycinemax merr L.、白菜Brassica rapavar.glabra和软尾生菜Lactuca sativa萌发的作用。结果显示:1)在结皮上表面:生物土壤结皮的厚度对4种植物种子萌发率均有反作用(P0.05,n=5);生物土壤结皮的抗压强度抑制软尾生菜的萌发率呈负相关(P0.05,n=5);生物土壤结皮的厚度与黑豆种子平均萌发时间呈正相关(P0.05,n=5)。2)在结皮下表面:生物土壤结皮的孔隙度和分形维数与小麦的萌发率呈正相关(P0.05,n=5);生物土壤结皮的厚度抑制了黑豆和白菜的萌发率(P0.05,n=5);生物土壤结皮的抗压强度对黑豆和软尾生菜萌发率起反作用(P0.05,n=5);生物土壤结皮容重的增加降低了小麦的萌发速率(P0.05,n=5);生物土壤结皮厚度增加减慢了黑豆、白菜和软尾生菜的萌发速率(P0.05n=5);生物土壤结皮抗压强度的增加降低了黑豆和白菜的萌发速率(P0.05,n=5)。结果表明,在结皮上表面,结皮厚度对4种植物种子萌发率均起抑制作用,尤其能够减慢胚根较为粗壮的黑豆种子的萌发速率。在结皮下表面,胚芽尖细的小麦可以利用结皮孔隙萌发;黑豆、白菜和软尾生菜由于子叶较大,不能利用生物土壤结皮的孔隙,其萌发率和萌发速率主要受生物土壤结皮的厚度或抗压强度抑制。
[Abstract]:The effects of physical properties of soil crust on the germination of wheat (Triticum aestivum L.), black bean (Glycinemax merr L.), Chinese cabbage (Brassica rapavar.glabra) and soft tailed lettuce (Lactuca sativa) were studied by redundancy analysis. The results showed that on the upper surface of the crust, the thickness of the crust of biological soil had a negative effect on the germination rate of four plant seeds (P0.05%), the compressive strength of the crust of biological soil inhibited the germination rate of lettuce with soft tail (P0.05%), and the rate of seed germination of the crust of biological soil was negative (P0.05%). The thickness of black bean seed was positively correlated with the average germination time of black bean seed (P0.05). 2) on the subcutaneous surface of black bean, the porosity and fractal dimension of soil crust were positively correlated with the germination rate of wheat (P0.05), and the thickness of the crust of biological soil inhibited the growth of black bean and Chinese cabbage. The germination rate (P0.05), the compressive strength of soil crust and the germination rate of black bean and soft tailed lettuce (P0.05); the increase of bulk density of soil crust decreased the germination rate of wheat (P0.05); and the thickness of soil crust decreased the germination rate of black bean. The germination rate (P0.05n=5) of Chinese cabbage and lettuce and the increase of soil crust compressive strength decreased the germination rate of black bean and Chinese cabbage (P0.05). The results showed that on the upper surface of the crust, the thickness of the crust inhibited the germination rate of the four plant seeds, especially slowed down the germination rate of the black bean seeds with thick radicle. On the subcutaneous surface of the knot, wheat with fine endosperm tips can be germinated by the pores of the crust, while black beans, cabbage and lettuce can not use the pores of the soil crusts because of the large cotyledons. The germination rate and germination rate were mainly inhibited by the thickness or compressive strength of soil crust.
【作者单位】：北京林业大学水土保持学院;内蒙古自治区林业监测规划院;
【基金】：“十二五”国家科技支撑计划项目(2012BAD16B02) 北京林业大学科学创新计划(TD2011-04)
【分类号】：S154

【参考文献】