青藏高原不同气候区高寒沙地两种优势植物及其根际土壤的养分特征

苟小林,周青平,陈有军,魏小星,涂卫国

Characteristics of nutrients in two dominant plant species and rhizospheric soils in alpine desert of the Qinghai-Xizang Plateau under contrasting climates

Xiao-Lin GOU,Qing-Ping ZHOU,You-Jun CHEN,Xiao-Xing WEI,Wei-Guo TU

表1 两种气候条件下植物器官及土壤养分比的比较

Table 1 Comparisons of nutrient ratios in tissues and rhizospheric soils between two climatic conditions

植物或根际土壤类型 Plant or rhizospheric soil	器官或土层 Tissue or soil layer	气候 Climate	碳氮比 C:N (SC:SN)		碳磷比 C:P (SC:SP)		氮磷比 N:P (SN:SP)
植物或根际土壤类型 Plant or rhizospheric soil	器官或土层 Tissue or soil layer	气候 Climate	M	SD	M	SD	M	SD
沙蒿 Artemisia desertorum	根 Roots	SA	39.493^b	0.906	199.046^b	5.998	5.039^a	0.037
	根 Roots	SH	87.596^a	1.527	284.528^a	10.402	3.247^b	0.063
	枝叶 Branches and leaves	SA	28.666^b	0.531	166.050^b	6.180	5.791^a	0.120
	枝叶 Branches and leaves	SH	66.201^a	2.762	289.091^a	19.047	4.366^b	0.175
中国沙棘 Hippophae rhamnoides subsp. sinensis	根 Roots	SA	30.730^b	0.514	344.732^b	23.832	11.213^a	0.634
	根 Roots	SH	38.210^a	0.489	425.255^a	38.610	11.139^a	1.155
	枝叶 Branches and leaves	SA	26.596^b	0.755	174.307^a	6.129	6.561^a	0.384
	枝叶 Branches and leaves	SH	32.697^a	0.497	178.604^a	7.098	5.461^b	0.137
沙蒿根际土壤 Rhizospheric soil of Artemisia desertorum	0-10 cm	SA	7.950^a	0.752	11.528^b	1.336	1.448^b	0.048
	0-10 cm	SH	8.481^a	0.519	15.761^a	2.008	1.860^a	0.215
	10-20 cm	SA	9.694^a	1.384	16.668^b	3.595	1.709^b	0.180
	10-20 cm	SH	9.233^a	1.247	32.617^a	7.558	3.540^a	0.787
中国沙棘根际土壤 Rhizospheric soil of Hippophae rhamnoides subsp. sinensis	0-10 cm	SA	16.085^a	0.334	25.857^a	1.315	1.607^a	0.066
	0-10 cm	SH	8.266^b	0.440	9.920^b	0.242	1.202^b	0.061
	10-20 cm	SA	10.999^a	0.486	24.849^a	2.788	2.265^a	0.305
	10-20 cm	SH	9.567^b	0.303	16.118^b	3.423	1.679^a	0.309