干旱区不同毛管布置方式下膜下滴灌棉花根系分布特征研究

Root Distribution Characteristics of Cotton under Drip Irrigation with Different Capillary Arrangements in Arid Area

采用称质量法，研究了干旱区膜下滴灌条件下不同地膜宽度对棉花根系干质量及其空间分布的影响。结果表明，毛管单管布置下，根系总质量、主根质量、侧根质量均以地膜宽度1．4m较高，地膜宽1．2m较低，其中O～30cm土层侧根质量所占比例较大，占总侧根质量的82．3％，占总质量的68．8％。毛管双管布置下，根系总质量、主根质量、侧根质量均以地膜宽度1．6m较高，地膜宽1．4m较低，侧根主要分布在0～30cm土层，占总侧根质量的72％，占总质量的56．6％。棉花根系在滴灌带方向分布密集，其他方向相对较少。

The effects of different film widths on dry weight and spatial distribution of cotton root were studied using weighing method under mulched drip irrigation. The results showed that： when single capillary tube was arranged, the total weight of roots, principal root weight and lateral root weight with film width of 1.4 m were all higher than those with film width of 1.2 m, of which lateral root mainly distributed in 0-30 cm soil layer and its weight was 82.3% of the total lateral roots weight and 68.8% of total weight. When tow capillary tubes were arranged, the total weight of roots, principal root weight and lateral root weight with film width of 1.6 m were all higher than those with film width of 1.4 m, of which lateral root mainly distributed in 0-30 cm soil layer and its weight was 72% of the total lateral roots weight and 56.6% of the total weight. Cotton root mainly distributed towards drip irrigation channel while root distributed less in other directions.