论文部分内容阅读
为了明确水稻根系在土壤中的空间分布特性,通过根箱试验,获取水稻根系坐标数据,采用方程Y=a(1-bX)(Y为根系累积长度,X为横向分布距离或纵向分布深度)建立根系纵向和根系横向分布模型,并利用模型分析田间水分管理对水稻根系生长及分布的影响.结果表明,水稻分蘖期和成熟期,约88%的根系分布在10 cm深度土层内,60%～70%根系分布在10 cm的横向范围内,其纵向和横向累积长度的变化均可用方程Y=a(1-bX)模拟.水分管理影响水稻根系生长数量和纵向分布,但不影响根系横向分布.间隙灌溉水稻根系分别比湿润灌溉和水层灌溉水稻根系分布深0.6和3.5 cm,根系长度分别比湿润灌溉、水层灌溉水稻多19.8%与26.4%,根系数量分别比湿润灌溉、水层灌溉水稻多28.3%及21.0%.平均角度的变化具有同样的趋势.
In order to clarify the spatial distribution characteristics of rice root in soil, root coordinate data of rice were obtained by root box experiment. The equation Y = a (1-bX) (Y is the root length, X is the horizontal distribution distance or vertical distribution depth) The vertical and horizontal root distribution models were established and the effects of field moisture management on the growth and distribution of rice roots were analyzed.The results showed that about 88% of the root system distributed in 10 cm deep soil layers at tillering and maturity stages The change of the cumulative length in both the horizontal and vertical directions can be simulated by the equation Y = a (1-bX). The effects of water management on the number and vertical distribution of root growth in rice did not affect the root system The root distribution of interstitial rice was 0.6 and 3.5 cm deeper than that of wetted and irrigated rice, respectively, and the root length was 19.8% and 26.4% more than that of wetted and irrigated irrigated rice respectively. The average irrigated rice is 28.3% and 21.0% more than the average irrigated rice.