极端干旱区花花柴（Karelinia caspia）和胡杨（Populus euphratica）叶凋落物分解和养分释放特征

doi:10.13866/j.azr.2021.02.19

Abstract

Abstract:

In arid regions, strong solar radiation and photodegradation or physical degradation accelerate the rate of litter decomposition. However, research on the decomposition of litter in extreme arid regions remains limited. In this study, we investigated the litter decomposition rate of plant species in extreme arid regions using the litter bag method. Karelinia caspia and Populus euphratica are two dominant species in Cele Oasis located at the southern margin of the Taklimakan Desert. Litter decomposition tests of K. caspia and P. euphratica were carried out in three habitats (aboveground, 2 cm belowground and hanging 1 m) to explore the mass decomposition of litters and the release of carbon (C) and nitrogen (N) from the litters in each habitat. The mass decomposition rates of K. caspia and P. euphratica showed significant differences at different depths; the mass loss of aboveground (0 cm) litter was significantly higher than that of 1 m hanging and 2 cm belowground litters. At the end of the litter decomposition test, the mass loss of K. caspia and P. euphratica wood was in the order: aboveground (19.91%) > 1 m hanging (15.99%) > 2 cm belowground (12.35%) and aboveground (24.15%) > 1 m hanging (13.44%) > 2 cm belowground (8.72%), respectively. During the entire decomposition process, the N content of litters of both plant species increased, whereas the C content decreased. At different decomposition positions, the enrichment of N and the loss of C varied significantly. The enrichment of N in aboveground and belowground litters was lower than that of hanging litters, whereas the loss of C from above-and belowground litters was greater than that from hanging litters. Olson’s exponential attenuation model was used to fit the mass residual rate of litters. The order of the decomposition constant (k) of the two plant species was in the order: aboveground > hanging > belowground. Additionally, multivariate analysis of the variance of mass residual rate of litters showed that both decomposition time and decomposition position had significant effects on the mass residual rate of litters (P<0.01). Overall, this study shows that in extreme arid regions, litter decomposition is mainly driven by photodegradation, not by the location of litter burial.

Key words: litters decomposition, mass loss, extreme drought, nutrient release

FAN Linjie,LI Xiangyi,LI Chengdao,LIN Lisha,XUE Wei. Decomposition and nutrient release characteristics of Karelinia caspia and Populus euphratica leaf litters in extreme arid regions[J].Arid Zone Research, 2021, 38(2): 479-486.

Figures/Tables 5

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References 43

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物种	处理	Olson指数模型	分解系数k/(g·g^-1·a^-1)	T_0.5/a	T_0.95/a
花花柴	H	y=96.301e^-0.284^t	0.284±0.035	2.44	10.54
	AG	y=98.116e^-0.405^t	0.405±0.06	1.71	7.40
	BG	y=98.073e^-0.260^t	0.26±0.032	2.67	11.52
胡杨	H	y=96.247e^-0.24^t	0.24±0.032	2.89	12.48
	AG	y=97.720e^-0.498^t	0.498±0.06	1.39	6.01
	BG	y=99.537e^-0.206^t	0.206±0.046	3.36	14.54

源	df	均方	F值	P
校正模型	29	91.58	7.02	0.00
截距	1	984996.50	75474.97	0.00
S	1	9.65	0.74	0.39
T	4	134.59	10.31	0.00
D	2	794.42	60.87	0.00
S×T	4	4.92	0.38	0.83
S×D	2	151.55	11.61	0.00
T×D	8	33.74	2.59	0.01
S×T×D	8	4.81	0.37	0.94
误差	120	13.05

Decomposition and nutrient release characteristics of Karelinia caspia and Populus euphratica leaf litters in extreme arid regions

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