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3 杉木枝叶枯死前的养分元素迁移量

Table 3 Average annual nutrient element transferred before death of branches and leaves of Chinese fir

林龄 Stand age (a)	器官 Organ	养分元素 Nutrient elements (kg·hm^-2·a^-1)					合计 Total (kg·hm^-2·a^-1)
林龄 Stand age (a)	器官 Organ	磷 Phosphorus	氮 Nitrogen	钾 Potassium	钙 Calcium	镁 Magnesium	合计 Total (kg·hm^-2·a^-1)
1-7	枝 Twig	0.01^bA	0.05^aA	0.11^cA	0.01^bA	0.01^bA	0.19^A
	叶 Needle	0.18^bB	1.25^aB	1.30^cB	0.19^bB	0.12^cB	3.04^B
	合 Total	0.19^bB	1.30^aQ	1.41^cQ	0.20^dB	0.13^eQ	3.23^Q
8-11	枝 Twig	0.04^bC	0.24^aC	0.42^cC	0.03^dD	0.03^dC	0.77^C
	叶 Needle	0.62^bD	5.24^aD	4.62^cD	0.86^dF	0.38^eD	11.72^D
	合 Total	0.66^bE	5.48^aE	5.04^cE	0.89^dE	0.41^eE	12.48^E
12-16	枝 Twig	0.15^bM	1.04^aM	1.49^cM	0.16^dM	0.09^eM	2.93^M
	叶 Needle	1.03^bN	8.47^aN	6.76^cN	1.44^dN	0.43^eN	18.13^N
	合 Total	1.18^bT	9.51^aT	8.25^cT	1.60^dT	0.52^eT	21.06^T
17-20	枝 Twig	0.39^bK	2.87^aK	3.47^cK	0.45^dK	0.18^eK	7.36^K
	叶 Needle	1.52^bR	11.98^aR	8.51^cR	2.11^dR	0.41^eR	24.53^R
	合 Total	1.91^bS	14.85^aS	11.98^cS	2.56^dS	0.59^eS	31.89^S
21-25	枝 Twig	0.41^bK	3.57^aW	3.71^cW	0.57^dW	0.14^eW	8.40^W
	叶 Needle	1.34^bG	10.30^aG	6.94^cG	2.02^dR	0.28^eG	20.88^G
	合 Total	1.75^bP	13.87^aP	10.65^cP	2.59^dP	0.42^eP	29.28^P