桂西北喀斯特森林植物-凋落物-土壤生态化学计量特征

曾昭霞, 王克林, 刘孝利, 曾馥平, 宋同清, 彭晚霞, 张浩, 杜虎

Stoichiometric characteristics of plants, litter and soils in karst plant communities of Northwest Guangxi

ZENG Zhao-Xia,WANG Ke-Lin,LIU Xiao-Li,ZENG Fu-Ping,SONG Tong-Qing,PENG Wan-Xia,ZHANG Hao,DU Hu

表2 6个群落植物、凋落物与土壤的C、N、P含量(mg·g^-1) (平均值±标准误差)

Table 2 C, N and P contents in plants, litter and soil in six forest communities (mg·g^-1) (mean ± SE)

含量 Content	项目 Item	原生林 Primary forest			次生林 Secondary forest
含量 Content	项目 Item	圆果化香树 Platycarya longipes	伞花木 Eurycorymbus cavaleriei	青檀 Pteroceltis tatarinowii	圆叶乌桕 Sapium rotundifolium	八角枫 Alangium chinense	黄荆 Vitex negundo
碳 C (mg·g^-1)	植物 Plant	429.3 ± 9.7^aA	438.8 ± 10.3^aA	432.3 ± 9.3^aA	422.3 ± 11.3^abA	416.6 ± 12.0^bA	425.9 ± 12.4^abA
	凋落物 Litter	395.1 ± 8.9^B	412.9 ± 9.0^A	399.4 ± 10.5^B	392.8 ± 10.6^B	385.2 ± 11.1^B	391.5 ± 12.5^B
	土壤 Soil	106.4 ± 6.2^abC	112.4 ± 7.1^aB	100.0 ± 6.6^bC	83.5 ± 7.4^cC	76.9 ± 6.0^cdC	72.9 ± 5.2^dC
氮 N (mg·g^-1)	植物 Plant	22.6 ± 4.4^aA	23.0 ± 4.1^aA	22.1 ± 3.7^aA	18.7 ±3.1^cA	19.9 ± 2.7^bcA	20.7 ± 2.7^bA
	凋落物 Litter	13.1 ± 2.3^B	12.5 ± 1.8^B	13.2 ± 2.1^B	12.7 ± 2.0^B	12.1 ± 3.1^B	12.8 ± 2.4^B
	土壤 Soil	6.4 ± 1.2^abC	5.7 ± 0.8^bC	5.9 ± 1.1^abC	7.2 ± 1.2^aC	6.8 ± 1.0^abC	6.1 ± 1.4^abC
磷 P (mg·g^-1)	植物 Plant	1.3 ± 0.4^A	1.4 ± 0.4^B	1.2 ± 0.4^B	1.1 ± 0.3	1.1 ± 0.4^A	1.2 ± 0.5
	凋落物 Litter	1.0 ± 0.1^B	1.1 ± 0.3^C	1.0 ± 0.3^C	0.8 ± 0.2	0.7 ± 0.4^B	0.8 ± 0.4
	土壤 Soil	1.4 ± 0.5^abA	1.7 ± 0.6^aA	1.6 ± 0.6^abA	1.2 ± 0.4^b	1.5 ± 0.5^abA	1.3 ± 0.4^b