自然光照和荫蔽条件下两种荒漠植物叶片凋落物分解特征研究

doi:10.12118/j.issn.1000-6060.2022.434

Abstract

Abstract:

In the southern edge of the Taklimakan Desert, the environmental conditions are harsh, the soil nutrient content is deficient, the plant community structure and composition are relatively simple. The impact of various environmental factors on litter decomposition is complex and specific. To explore the decomposition characteristics of litter in extremely arid areas, we conducted a study using litter decomposition bags to analyze the leaf litter of two dominant desert plant species, Alhagi sparsifolia and Karelinia caspia, under natural light and shade treatments. We investigated the mass loss and release characteristics of carbon (C) and nitrogen (N) in leaf litter. The results were as follows: (1) The mass loss process of both plant litter samples followed an exponential decay model. (2) After nine months of decomposition, the mass loss rates of the Alhagi sparsifolia and Karelinia caspia leaf litter samples were 39.81%, 45.43%, 22.22%, and 20.06% under natural light and shade treatments, respectively. The decomposition rate of litter under light conditions was significantly higher than that under shade conditions (P<0.05). (3) Throughout the decomposition process, the C content of both plant litter samples was in a state of release, whereas the N content exhibited different release states. The N content of Alhagi sparsifolia leaf litter exhibited an enrichment-release-enrichment state, whereas that of Karelinia caspia leaf litter exhibited an enrichment state. In conclusion, our study suggests that light radiation is the primary driving factor affecting litter decomposition in extremely arid areas.

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

WANG Jianian, LI Xiangyi, LI Chengdao, ZHANG Ailin, LIN Lisha. Decomposition characteristics of two desert plant leaf under natural light and shade environment[J].Arid Land Geography, 2023, 46(6): 949-957.

Figures/Tables 5

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References 44

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物种	C/g·kg^-1	N/g·kg^-1	C:N	纤维素/%	半纤维素/%	木质素/%
骆驼刺（Alhagi sparsifolia）	395.8±5.83a	15.4±0.18a	25.7±0.22b	28.1±0.7a	2.8±0.3b	10.7±0.3b
花花柴（Karelinia caspia）	340.6±6.89b	7.11±0.13b	48.0±1.13a	24.9±1.4a	14.3±1.9a	14.7±0.8a

物种	处理	Olson指数模型	分解系数/g·g^-1·a^-1	决定系数	T_50%/a	T_95%/a
骆驼刺	自然光照	y=104.07e^-0.737^t	0.737	0.8814	0.94	4.06
	遮光	y=101.47e^-0.367^t	0.367	0.8460	1.89	8.16
花花柴	自然光照	y=101.34e^-0.818^t	0.818	0.9436	0.85	3.66
	遮光	y=100.85e^-0.361^t	0.361	0.7937	1.92	8.30

因素	df	均方	F	P
修正模型	27	704.095	57.037	0.000
截距	1	705679.800	57165.793	0.000
S	1	154.637	12.527	0.001^**
T	6	2121.226	171.836	0.000^**
D	1	4637.232	375.653	0.000^**
S×T	6	8.801	0.713	0.640
S×D	1	124.123	10.055	0.002^**
T×D	6	199.757	16.182	0.000^**
S×T×D	6	19.311	1.564	0.168
误差	84	12.340	-	-

Decomposition characteristics of two desert plant leaf under natural light and shade environment

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