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作者	单位
李浩然，李慧玲，王红光，李东晓，李瑞奇，李雁鸣	（河北农业大学农学院/河北省作物生长调控重点实验室，河北保定 071000）

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中文摘要:

为使小麦叶面积测算的方法更为精确，以田间种植的冬小麦植株为材料，测算了冬小麦叶面积的校正值K。在小麦每个主茎叶片展开时和主要生育时期取样，用直尺测定小麦叶片的长度（L）和宽度（W），并用Li-3000便携式叶面积仪测定对应的叶面积（A），用K=A /(L·W)进行计算。结果表明，冬小麦冬前主茎叶的平均K值为0.748 8≈0.75，春生主茎叶的平均K值为0.780 6≈0.78，全株主茎叶的平均K值为0.766 2≈0.77。按生育时期测定，越冬前全部叶片的平均K值为0.729 8≈0.73，春季各生育时期平均K值为0.768 0≈0.77，全部生育时期的平均K值为0.760 4≈0.76。通过与叶面积仪实测的值比较，用全部生育时期的平均值K=0.76，依据公式A=K∑（L·W）计算的小麦各生育时期的单株叶面积和叶面积指数，比用常用的K=0.83得到的结果更准确，因而建议在利用系数法计算叶面积时采用K=0.76。

英文摘要:

In order to measure and calculate leaf area of winter wheat more accurately, the rectification value K, for leaf area was measured and calculated with field grown winter wheat plants as materials. Wheat leaves were sampled when each leaf fully expanded,and at each growth stage. The length(L) and width(W) of each leaf were measured with a ruler, and the corresponding area(A) of the leaf was determined with Li 3000 potable leaf area meter,and K was calculated by the equation,K=A/(L·W). The results showed that, the average K of pre winter wheat leaves on main stem was 0.748 8≈0.75, and that of spring grown leaves was 0.780 6≈0.78, and that of all leaves on main stem was 0.766 2≈0.77. Measured at main growth stages, the average K of all leaves(including tiller leaves) before over winter was 0.729 8≈0.73, and the average K of all spring growth stages was 0.768 0≈0.77, and that of all growth stages was 0.760 4≈0.76.Comparison with the values measured by leaf area meter as controls showed that, the leaf area of a single plant and leaf area indices of all growth stages calculated from K=0.76 which was the average of all growth stages, i.e., the equation A=0.76∑（L·W）, was closer to the controls and more accurate than those calculated from K=0.83 which was usually used. It is, therefore,suggested that,K=0.76 is used when measuring the leaf area of winter wheat with rectification value method.

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