不同林龄杉木组织迁移养分的再利用

吕中诚,康文星,黄志宏,赵仲辉,邓湘雯

Reuse of retranslocated nutrients in tissues of Chinese fir in plantations of different ages

LÜ Zhong-Cheng,KANG Wen-Xing,HUANG Zhi-Hong,ZHAO Zhong-Hui,DENG Xiang-Wen

表1 不同林龄杉木体内的养分元素迁移量

Table 1 Average annual nutrient element transfer within the body of Chinese fir in different ages

林龄 Stand age (a)	养分元素 Nutrient elements (kg·hm^-2·a^-1)					合计 Total (kg·hm^-2·a^-1)
林龄 Stand age (a)	氮 Nitrogen	磷 Phosphorus	钾 Potassium	钙 Calcium	镁 Magnesium	合计 Total (kg·hm^-2·a^-1)
8-11	+3.11^aM	+0.37^bM	+1.36^cM	+1.96^dM	+1.03^eM	+7.83^M
12-16	-1.41^aN	-0.43^bN	-1.27^cN	-1.90^dM	-0.82^eN	-5.83^N
17-20	-1.66^aR	-0.53^bR	-1.40^cM	-2.26^dR	-0.90^eR	-6.75^R
21-25	-1.30^aS	-0.40b^N	-1.06^cS	-1.77^dS	-0.65^eS	-5.18^S