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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(P<0.05,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(P<0.05,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(P<0.05,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(P<0.05,n=5);生物土壤结皮的厚度抑制了黑豆和白菜的萌发率(P<0.05,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(P<0.05,n=5);生物土壤结皮容重的增加降低了小麦的萌发速率(P<0.05,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(P<0.05n=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(P<0.05,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。
In this study, the method of redundancy analysis was used to investigate the effects of physical properties of biological soil crusts on the germination of Triticum aestivum L., Glycine max merr L., Brassica rapa var. Glabra and Lactuca sativa. The results showed that: 1) On the surface of the crust, the thickness of biological soil crust had a negative effect on the seed germination rate (P <0.05, n = 5); the compressive strength of biological soil crust (P <0.05, n = 5). The thickness of biological soil crust was positively correlated with the average germination time of black bean seeds (P <0.05, n = 5). 2) The lower surface of the crust: The porosity and fractal dimension of biological soil crust were positively correlated with the germination rate of wheat (P <0.05, n = 5); the thickness of biological soil crust inhibited the germination rate of black bean and cabbage P <0.05, n = 5). The compressive strength of biological soil crusts had an adverse effect on the germination rate of black bean and soft tail lettuce (P <0.05, n = 5). The increase of bulk soil crust weight decreased the germination rate of wheat (P <0.05, n = 5). The increase of biological soil crusts slowed the germination rate of black beans, cabbage and soft-tail lettuce (P <0.05n = 5) And cabbage germination rate (P <0.05, n = 5). The results showed that on the surface of the crust, the thickness of crusts had an inhibitory effect on the seed germination rate of all four plants, especially the germination rate of the more robust black bean seeds. On the lower surface of the crust, the triticale germ can germinate through the skin pores; black bean, cabbage and soft tail lettuce can not utilize the pores of the biological soil crust due to the large cotyledon. The germination rate and germination rate are mainly affected by biological soil crust Thickness or compressive strength is suppressed.