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东北地区3种桦木木质部导管特征对气候变化响应的趋同与差异
白雨鑫1, 苑丹阳1, 王兴昌1, 刘玉龙2,3, 王晓春1,*()
Comparison of characteristics of tree trunk xylem vessels among three species of Betula in northeast China and their relationships with climate
BAI Yu-Xin1, YUAN Dan-Yang1, WANG Xing-Chang1, LIU Yu-Long2,3, WANG Xiao-Chun1,*()

图6. 3种桦木树轮解剖参数主成分(PC)分析。Kh, 理论导水率; Ks, 特异性导水率; MVA, 平均导管面积; RCTA, 导管占比; TVA, 导管总面积; VD, 导管密度; VN, 导管数量; RW, 年轮宽度。cos2, 变量在因子图上的表示质量。树种代码同表1

Fig. 6. Principal component (PC) analysis of anatomical parameters of the annual rings of three birch species. Kh, theoretical hydraulic conductivity; Ks, specific hydraulic conductivity; RCTA, mean percentage of conductive area within xylem; MVA, mean vessel area; TVA, total vessel area; VD, vessel density; VN, number of vessels; RW, ring width. cos2, the quality of representation for variables on the factor map. See Table 1 for the codes of tree species.