Cate Thomas M, Perkins T D
Proctor Maple Research Center, The University of Vermont, P.O. Box 233, Underhill Center, VT 05490, USA.
Tree Physiol. 2003 Oct;23(15):1077-9. doi: 10.1093/treephys/23.15.1077.
We conducted two experiments to determine the usefulness of a chlorophyll content meter (CCM) for the measurement of foliar chlorophyll concentration in sugar maple (Acer saccharum Marsh.) in the fall color period. In Experiment 1, four sugar maple trees were visually assigned to each of four fall foliage color categories in October 1998. On four dates in the fall of 1999, leaves were taken from the trees and analyzed for chlorophyll concentration by absorbance of pigment extracts and by determination of the chlorophyll content index (CCI) with a CCM. The two measures of chlorophyll concentration were strongly correlated (P < 0.001, r2 = 0.72). In Experiment 2, the CCI of leaves from sugar maple trees subjected to one of four fertilization treatments (lime, lime + manure, lime + 10:10:10 N,P,K fertilizer and an untreated control) were determined with a CCM. Treatment effects were distinguishable between all pairwise comparisons (P < 0.001), except for the lime versus lime + NPK fertilizer treatments.
我们进行了两项实验，以确定叶绿素含量仪（CCM）在秋季变色期测量糖枫（糖槭）叶片叶绿素浓度的实用性。在实验1中，1998年10月，根据视觉观察将四棵糖枫分别归入四个秋季叶色类别中的一类。在1999年秋季的四个日期，从这些树上采集叶片，通过色素提取物的吸光度以及使用CCM测定叶绿素含量指数（CCI）来分析叶绿素浓度。叶绿素浓度的这两种测量方法高度相关（P < 0.001，r2 = 0.72）。在实验2中，使用CCM测定了接受四种施肥处理（石灰、石灰 + 粪肥、石灰 + 10:10:10氮磷钾肥料以及未处理对照）之一的糖枫树叶的CCI。除了石灰处理与石灰 + 氮磷钾肥料处理之间外，所有两两比较的处理效果均有显著差异（P < 0.001）。
