荒漠灌丛土壤酶活性对UV-B辐射及凋落物分解的响应

doi:10.13866/j.azr.2022.04.19

Abstract

Abstract:

Exploring the response of soil enzyme activity to UV-B radiation and decomposition of different litters is crucial for revealing litter turnover and soil nutrient dynamics. The effects of UV-B radiation on soil enzyme activities of litters of Reaumuria soongarica and Salsola passerina and their mixture were studied by using simulated UV-B radiation filtration (mylar film method) and decomposition bag method. The following results are presented. (1) Radiation filtration increased the soil urease and alkaline phosphatase activities of different litters and promoted the soil enzyme activities of S. passerina shrub significantly, which increased by 45.45%, 58.28% and 39.04%, 117.65% in different soil layers (0-5 cm and 5-15 cm), respectively. The radiation filter minimizes the different litter reductions. However, soil polyphenol oxidase and peroxidase activities of lignin, which are the same soil enzyme activity of S. passerina thickets of inhibition effect, are observed in different soil reductions by 36.69%, 39.52% and 59.78%, 43.63%, respectively. Radiation filtration did not affect on soil cellulase activity. (2) Under radiation filtration and natural light conditions, the activity of polyphenol oxidase in the soil of mixed litters was lower than that of single litters, indicating that the degree of organic matter humification in the soil of mixed litters was larger than that of organic matter accumulation, and the degree of soil humification was high. (3) The effects of different litters on the enzyme activities of surface soil (0-5 cm) were observed. Soil urease and phosphatase activities decreased and polyphenol oxidase activities increased with the deepening of the soil layer.

Key words: UV-B radiation, litter, arid desert, soil enzyme

WEI Changlin,LI Yi,SHAN Lishan,XIE Tingting. Desert shrub soil enzyme activity of UV-B radiation and litter decomposition response[J].Arid Zone Research, 2022, 39(4): 1181-1190.

Figures/Tables 10

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	因变量	平方和	自由度	均方	统计检定值	显著性
0~5 cm土层脲酶	辐射	3801.85	1	3801.85	96.12	P<0.01
	类型	49202.83	2	24601.41	19.99	P<0.01
	辐射×类型	1322.31	2	661.16	16.71	P<0.01
5~15 cm土层脲酶	辐射	5632.65	1	5632.65	0.58	P<0.05
	类型	100.67	2	50.34	1.27	P=0.32
	辐射×类型	4534.80	2	2267.40	1.84	P=0.20

	因变量	平方和	自由度	均方	统计检定值	显著性
0~5 cm土层脲酶	辐射	621.48	1	621.48	13.91	P<0.01
	类型	1525.50	2	762.75	17.08	P<0.01
	辐射×类型	357.11	2	178.55	3.99	P<0.05
5~15 cm土层脲酶	辐射	3801.85	1	3801.85	96.12	P<0.01
	类型	100.67	2	50.34	1.27	P=0.32
	辐射×类型	1322.31	2	661.16	16.72	P<0.01

	因变量	平方和	自由度	均方	统计检定值	显著性
0~5 cm土层脲酶	辐射	13.01	1	13.01	0.58	P=0.46
	类型	235.01	2	117.51	15.96	P<0.01
	辐射×类型	362.66	2	181.33	8.11	P<0.01
5~15 cm土层脲酶	辐射	0.01	1	0.01	0.00	P=0.98
	类型	142.54	2	71.27	3.19	P=0.08
	辐射×类型	141.81	2	70.90	9.63	P<0.01

	因变量	平方和	自由度	均方	统计检定值	显著性
0~5 cm土层脲酶	辐射	31.72	1	31.73	16.50	P<0.01
	类型	78.09	2	39.04	20.30	P<0.01
	辐射×类型	23.11	2	11.55	6.01	P<0.05
5~15 cm土层脲酶	辐射	43.25	1	43.25	27.67	P<0.01
	类型	33.46	2	16.73	10.70	P<0.01
	辐射×类型	30.24	2	15.12	9.67	P<0.01

	因变量	平方和	自由度	均方	统计检定值	显著性
0~5 cm土层脲酶	辐射	8.93	1	8.94	6.87	P<0.05
	类型	4.81	2	2.41	1.85	P=0.20
	辐射×类型	6.88	2	3.44	2.65	P=0.11
5~15 cm土层脲酶	辐射	5.13	1	5.13	5.29	P<0.05
	类型	5.69	2	2.85	2.93	P=0.09
	辐射×类型	4.44	2	2.22	2.29	P=0.14

Desert shrub soil enzyme activity of UV-B radiation and litter decomposition response

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