秸秆与地膜覆盖玉米农田土壤水分时空动态变化——兼评回归等值线法的应用
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* 山西省归国留学人员基金(99045);山西省攻关基金(011053)资助


TEMPORAL AND SPATIAL VARIATION OF SOIL MOISTUREIN CORN FIELD MULCHED WITH STRAW AND PLASTIC FILM——SIMULTANEOUS EVALUATION OF THE APPLICATION OF REGRESSION ISOGRAM
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    摘要:

    利用回归等值线法对秸秆和地膜覆盖玉米农田土壤水分时空动态变化进行了分析比较。结果表明:从2002年4月29日(玉米出苗期)至2003年1月4日的250d内,对照秸秆和地膜覆盖处理下,在0~150cm土层内的土壤含水量随时间变化都呈“降低—增加”的趋势,随土层深度变化呈“降低—增加—降低”的趋势。土壤含水量随时间而降低阶段与玉米生育期耗水量增加阶段相吻合。对照处理最低水分区域出现提前,位置上升;地膜覆盖处理土壤含水量下降幅度最大,最低水分区域有明显向底层延伸的趋势;而秸秆覆盖处理最低水分区域土壤含水量相对最高。从玉米生育后期一直到测定结束时的翌年1月份,3种覆盖处理土壤含水量都呈上升趋势,且以上层土壤水分增加幅度大于中、下层土壤。回归等值线法反映了土壤水分时空动态变化的基本趋势和规律,具有简单省时、图形简洁明了、信息量大、便于分析等特点,可用于土壤水分测定数据的整理和分析。

    Abstract:

    Regression isogram was employed to analyze temporal and spatial variation of soil moisture in cornfield mulched with straw and plastic film.The results showed that soil moisture in CK,Treatment SM (straw mulching),and Treatment PM (plastic film mulching) all followed the same trend of going down first and then rising up' with the time in the experimental period of 250 d;and then the trend turned downward again with the depth in profile to 150 cm.The decreasing in soil moisture with the time was parallel to the rising intensity of soil water consumption by corn.The lowest soil water zone occurred much earlier and much closer to the soil surface in CK than in Treatments SM and PM.Treatment PM dropped the most rapidly in soil water content and its lowest soil water zone had a trend of extending downward,whereas Treatment SM had the highest soil moisture content in the lowest soil water zone.The soil moisture of cornfield in CK and the 2 treatments began to increase continuously from the late growth period of corn to the end of the experiment (Jan.4,2003),much more in the upper layer than in the middle layer or bottom layer.It can thus be inferred that regression isogram can be used to reflect the trend and pattern of the temporal and spatial variation of soil moisture and has the characteristics of being simple and time-saving,explicit in graph,vast in information,and easy to analyze.Therefore,it can be used as a good tool for collation and analysis of soil moisture data.

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卜玉山,苗果园,周乃健,王建程,邵海林.秸秆与地膜覆盖玉米农田土壤水分时空动态变化——兼评回归等值线法的应用[J].土壤学报,2004,41(5):795-802. DOI:10.11766/trxb200310130520 Bu Yushan, Miao Guoyuan, Zhou Naijian, Wang Jiancheng, Shao Hailin. TEMPORAL AND SPATIAL VARIATION OF SOIL MOISTUREIN CORN FIELD MULCHED WITH STRAW AND PLASTIC FILM——SIMULTANEOUS EVALUATION OF THE APPLICATION OF REGRESSION ISOGRAM[J]. Acta Pedologica Sinica,2004,41(5):795-802.

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  • 收稿日期:2003-10-13
  • 最后修改日期:2004-04-22
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  • 在线发布日期: 2013-02-25
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