降雨变化对高寒草甸不同植物功能群凋落物质量及其分解的影响

杨德春, 胡雷, 宋小艳, 王长庭

Effects of changing precipitation on litter quality and decomposition of different plant functional groups in an alpine meadow

YANG De-Chun, HU Lei, SONG Xiao-Yan, WANG Chang-Ting

表1 不同降雨处理下不同功能群及群落凋落物初始化学计量比(平均值±标准误, n = 3)

Table 1 Initial stoichiometric ratio of litters in different plant functional groups and communities under different precipitation treatments (mean ± SE, n = 3)

凋落物类型 Litter type	降雨处理 Precipitation treatment	碳氮比 C:N	碳磷比 C:P	氮磷比 N:P	木质素氮比 Lignin:N
禾本科 Grass	Pr-90	39.89 ± 7.83^b	284.72 ± 5.46^b	7.29 ± 0.66^a	4.63 ± 1.14^b
	Pr-50	40.61 ± 5.20^b	218.11 ± 10.87^bc	5.40 ± 0.21^b	4.35 ± 0.32^b
	Pr-30	34.56 ± 11.61^b	205.99 ± 32.36^bc	5.05 ± 0.62^bc	4.96 ± 0.69^b
	CK	59.29 ± 6.13^a	422.31 ± 31.38^a	7.13 ± 0.39^a	8.78 ± 0.79^a
	Pr+50	58.95 ± 5.53^a	214.73 ± 14.81^c	3.68 ± 0.37^c	7.59 ± 1.19^a
莎草科 Sedge	Pr-90	32.00 ± 7.20^a	187.68 ± 7.32^bc	6.02 ± 0.60^ab	2.10 ± 0.27^b
	Pr-50	29.73 ± 7.44^a	157.00 ± 12.52^cd	5.42 ± 0.61^bc	1.75 ± 0.31^b
	Pr-30	36.08 ± 5.33^a	203.36 ± 4.81^b	5.72 ± 0.55^abc	3.20 ± 0.72^a
	CK	35.10 ± 6.74^a	262.80 ± 15.30^a	7.57 ± 0.38^a	2.01 ± 0.24^b
	Pr+50	37.79 ± 7.89^a	135.70 ± 12.49^d	3.76 ± 0.80^c	2.10 ± 0.39^b
杂类草 Forb	Pr-90	32.51 ± 3.28^ab	196.31 ± 29.32^ab	5.98 ± 0.62^ab	3.76 ± 0.68^abc
	Pr-50	34.20 ± 1.58^ab	184.84 ± 2.23^ab	5.41 ± 0.14^ab	4.04 ± 0.21^ab
	Pr-30	29.63 ± 0.79^b	187.40 ± 3.94^ab	6.32 ± 0.07^a	4.48 ± 0.12^a
	CK	35.53 ± 1.09^a	230.84 ± 8.03^a	6.50 ± 0.23^a	3.61 ± 0.30^bc
	Pr+50	32.69 ± 4.11^ab	153.42 ± 13.25^b	4.79 ± 0.70^b	3.18 ± 0.09^c
群落 Community	Pr-90	38.53 ± 2.91^a	265.60 ± 16.99^a	6.90 ± 0.37^ab	4.12 ± 0.40^a
	Pr-50	29.90 ± 2.54^cd	177.17 ± 10.97^b	5.92 ± 0.21^b	3.16 ± 0.56^b
	Pr-30	26.51 ± 3.14^d	166.29 ± 16.61^bc	6.26 ± 0.29^ab	3.38 ± 0.40^ab
	CK	32.51 ± 1.25^bc	231.13 ± 2.96^a	7.12 ± 0.18^a	3.87 ± 0.16^ab
	Pr+50	34.59 ± 1.49^ab	128.28 ± 19.92^c	3.69 ± 0.51^c	3.94 ± 0.50^ab