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作者	单位
刘战东，高阳，巩文军，段爱旺	（1.中国农业科学院农田灌溉研究所农业部作物需水与调控重点开放实验室，河南新乡 453003；2.中国农业科学院研究生院，北京 100081； 3.河南省焦作市广利灌区管理局，河南沁阳 454550）

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中文摘要:

为定量分析冬小麦冠层降水截留量，采用“简易吸水法”分别研究了冬小麦单茎和群体的冠层截留性能，并对其影响因素进行了探讨。结果表明，在冬小麦抽穗前，叶数对单茎截留量影响显著（P<0.05），而对截留率影响不明显。在叶数相同条件下，单茎截留量在不同生育期间差异显著（P<0.01）。冬小麦单茎截留量随叶面积的增大而增大，而叶面积对截留率影响不显著。冬小麦单茎截留量与株高、鲜重呈线性正相关，相应截留率则与株高、鲜重呈线性负相关；群体截留量与叶面积指数（LAI）、地上部生物量呈线性正相关，相应截留率则与LAI、地上部生物量呈线性负相关。从拔节至成熟，冬小麦冠层截留量先增加后减少，最大冠层截留量出现在抽穗期（1.28 mm），且不同生育期截留量差异极显著(P<0.01)；相应截留率在不同生育期的变化无规律，各生育期间差异不显著。

英文摘要:

Rainfall interception by the canopy of winter wheat (Triticum aestivum L.) has important effect on rainfall use efficiency.In this paper, the capability of canopy interception of rainfall by the individual and groups of winter wheat was measured and the influencing factors were analyzed by using wet absorption method.The result showed that leaf number had remarkably effect on the rainfall interception for the individual winter wheat (P<0.05), the interception rate was not significantly before the heading stage.As the same number of leaves of winter wheat, the individual interception was different significantly at each growth period (P<0.01).The individual interception of winter wheat increased along with the increasing of leaf area, but the influence of leaf area on interception rate was not remarkable.The individual interception of winter wheat increased linearly with the increasing of plant height and fresh weight, respectively, while the interception rate decreased linearly.The group interception of winter wheat presented linear and positive correlation with leaf area index (LAI), aboveground biomass weight, separately, while the interception rate presented negative correlations.From the jointing to the mature stages, canopy interception of winter wheat first increased and then decreased, which the difference at each growth period was extremely remarkable (P<0.01), and the maximum amount of canopy interception (1.28 mm) appeared at heading stage.The corresponding interception rate changed irregularly, the differences at each growth period were not prominent.

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