Effects of mycorrhiza on nutrient release during fine root decomposition in degraded sandy grassland

doi:10.11686/cyxb2021375

Abstract

Abstract:

The release of nutrients during the decomposition of fine roots is the key process in the circulation of materials in soils in low-vegetation areas， but the role of mycorrhiza in this process is unclear. In this study， we explored the dynamics of nutrient （nitrogen， phosphorus， potassium） release during the fine root decomposition of Artemisia halodendron， a pioneer shrub during vegetation restoration in degraded sandy grassland. The in-growth core method was used to collect samples from two treatments （living fine roots+mycorrhiza， and mycorrhiza only） and a root-free control. We found that mycorrhiza affected the nutrient contents of A. halodendron fine root litter during decomposition， with the strongest effect at the later stage of the decomposition period （after 1 year）. When the decomposition period was longer than 1 year， mycorrhiza significantly reduced the N content of fine root litter， and this was not affected by presence of living fine roots. The N content of litter in the mycorrhiza+living fine roots and mycorrhiza treatments was 15.3% and 9.5% lower， respectively， than that of litter in the control. The P and K contents in fine root litter were significantly lower in the mycorrhiza treatment than in the control after 1 year of decomposition （P<0.05）， but this effect was weakened by the presence of living fine roots. The P and K contents did not differ significantly between the living fine roots+mycorrhiza treatment and the control （P>0.05）. Analyses of the dynamics of nutrients remaining in the litter showed that the mycorrhiza significantly promoted N release during decomposition （P<0.05）， and this promoting effect mainly occurred in the middle stage of decomposition. For the release of P and K， the promoting effect of mycorrhiza was mainly at the late stage of decomposition， and the effect was weakened by the presence of living fine roots. These results indicate that mycorrhiza affect nutrient release during fine root decomposition， and should be paid more attention in research on root decomposition and its relationship with the turnover of materials in soil.

Key words: mycorrhiza, fine root decomposition, nutrient elements, in-growth core method, Artemisia halodendron

Jie-ping DING, Yong-qing LUO, Wei-chun LIU, Fei WEN, Li-long WANG, Xu-yang WANG, Yu-long DUAN, Jie LIAN. Effects of mycorrhiza on nutrient release during fine root decomposition in degraded sandy grassland[J]. Acta Prataculturae Sinica, 2022, 31(5): 115-123.

Figures/Tables 7

References 33

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元素Elements	平均值Mean value	标准差Standard deviation	最大值Maximum	最小值Minimum
碳Carbon （C）	40.76	1.00	39.66	41.59
氮Nitrogen （N）	1.43	0.16	1.26	1.63
磷Phosphorus （P）	0.22	0.01	0.21	0.24
钾Potassium （K）	1.43	0.10	1.29	1.54
钠Sodium （Na）	0.03	0.01	0.02	0.05
钙Calcium （Ca）	0.47	0.05	0.38	0.51
镁Magnesium （Mg）	0.16	0.02	0.14	0.19

元素Elements	平均值Mean value	标准差Standard deviation	最大值Maximum	最小值Minimum
碳Carbon （C）	40.76	1.00	39.66	41.59
氮Nitrogen （N）	1.43	0.16	1.26	1.63
磷Phosphorus （P）	0.22	0.01	0.21	0.24
钾Potassium （K）	1.43	0.10	1.29	1.54
钠Sodium （Na）	0.03	0.01	0.02	0.05
钙Calcium （Ca）	0.47	0.05	0.38	0.51
镁Magnesium （Mg）	0.16	0.02	0.14	0.19

指标 Parameters	处理 Treatments （T）		分解时间Decomposition time （DT）		处理×分解时间T×DT
指标 Parameters	F值F-value	P值P-value	F值F-value	P值P-value	F值F-value	P值P-value
氮含量N content	5.090	0.008	98.740	<0.001	3.680	0.001
磷含量P content	17.144	<0.001	13.617	<0.001	3.548	0.001
钾含量K content	6.877	0.002	494.427	<0.001	0.970	0.465
N∶P	10.414	<0.001	56.373	<0.001	5.955	<0.001
N∶K	4.779	0.011	118.078	<0.001	1.282	0.264
P∶K	0.037	0.963	55.034	<0.001	0.862	0.551

指标 Parameters	处理 Treatments （T）		分解时间Decomposition time （DT）		处理×分解时间T×DT
指标 Parameters	F值F-value	P值P-value	F值F-value	P值P-value	F值F-value	P值P-value
氮含量N content	5.090	0.008	98.740	<0.001	3.680	0.001
磷含量P content	17.144	<0.001	13.617	<0.001	3.548	0.001
钾含量K content	6.877	0.002	494.427	<0.001	0.970	0.465
N∶P	10.414	<0.001	56.373	<0.001	5.955	<0.001
N∶K	4.779	0.011	118.078	<0.001	1.282	0.264
P∶K	0.037	0.963	55.034	<0.001	0.862	0.551

指标 Parameters	处理 Treatments （T）		分解时间Decomposition time （DT）		处理×分解时间T×DT
指标 Parameters	F值 F-value	P值 P-value	F值 F-value	P值 P-value	F值 F-value	P值 P-value
N	8.709	<0.001	10.350	<0.001	1.455	0.186
P	19.953	<0.001	87.194	<0.001	1.008	0.436
K	5.549	0.005	564.419	<0.001	1.035	0.417