Dynamic Changes of Total Carbon Release During Mixed Decomposition of Leaf Litter of Pinus massoniana and Native Broad-leaved Tree Species

doi:10.7525/j.issn.1673-5102.2022.02.016

Abstract

Abstract:

In order to improve the structure of low-efficiency forest in hilly， the total carbon（C） release of Pinus massoniana and native broad-leaved tree species in the process of mixed decomposition of litter was investigated. The litters of Pinus massoniana， Sassafras tzumu， Cinnamomum camphora and Toona sinensis that widely distributed in South Chinawere divided into 35 treatments according to different tree species combination and mixed proportion， and then field decomposition experiments were carried out to explore the best combination and mixing ratio of C release. The results showed that the C release of leaf litter of T. sinensis was the fastest， followed by S. tzumu and C. camphora litter， and the slowest in P. massoniana litter among the four tree species， In 31 mixed litter leaves treatments， the non-additive effect of C release increased at first and then decreased with the extension of decomposition time. Compared with other seasons， the non-additive effect of C release rate decreased in autumn. Among the combinations of P. massoniana with a broad tree， the synergistic effect of PC73 and PC64 was stronger in the treatment with broadleaf accounting for more than 30% in the combination of P. massoniana and C. camphora leaf litter； Among the combination of P. massoniana with two or three broad trees， the treatment with broad leaf accounting for more than 30% and containing T. sinensis litter： PST613 and 712， PCT631 and 613， PSCT7111 and 6121 showed stronger synergistic effect.

Key words: Pinus massoniana, pure forest, native tree species, mixed decomposition of litter, C release, mixed effect

CLC Number:

S791.248

Xun Li, Yan Zhang, Simeng Song, Yang Zhou, Jian Zhang. Dynamic Changes of Total Carbon Release During Mixed Decomposition of Leaf Litter of Pinus massoniana and Native Broad-leaved Tree Species[J]. Bulletin of Botanical Research, 2022, 42(2): 309-320.

Figures/Tables 11

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Appendix table 1 Initial litter quality characteristics of the mixed litter used in the experimental work（mean±SD）

凋落物组合 Treatments	C /（g·kg^-1）	N /（g·kg^-1）	P /（g·kg^-1）	木质素 Lignin /（g·kg^-1）	纤维素 Cellulose /（g·kg^-1）	总酚 Total phenol /（g·kg^-1）	缩合单宁 Condensed tannin /（g·kg^-1）	C/N	C/P	N/P	木质素/N Lignin/N	木质素/P Lignin/P
PT82	437.96±7.26	7.15±0.35	1.02±0.03	307.74±9.20	129.01±15.28	49.15±2.26	20.54±0.87	61.43±3.07	430.50±13.47	7.02±0.18	43.11±0.93	302.29±4.35
PT73	430.58±6.49	7.68±0.23	1.07±0.03	286.07±7.85	125.28±13.93	46.63±1.91	18.43±0.76	56.08±1.72	403.78±10.73	7.20±0.03	37.23±0.16	268.10±0.52
PT64	423.20±5.76	8.22±0.12	1.12±0.03	264.40±6.69	121.55±12.59	44.12±1.56	16.32±0.66	51.47±0.83	379.46±9.30	7.37±0.12	32.15±0.36	236.96±2.50
PS82	444.92±6.67	6.13±0.53	0.91±0.03	315.46±9.61	128.54±13.58	50.42±2.39	64.94±0.28	73.16±6.39	488.76±19.24	6.72±0.48	51.75±3.04	346.25±8.27
PS73	441.02±5.60	6.16±0.52	0.91±0.03	297.65±8.73	124.57±11.41	48.55±2.10	66.04±0.28	72.12±5.87	486.74±17.51	6.78±0.47	48.58±2.8	328.21±4.81
PS64	437.12±4.59	6.19±0.51	0.90±0.03	279.85±8.29	120.61±9.30	46.67±1.81	67.13±0.32	71.10±5.45	484.72±16.02	6.85±0.45	45.45±2.74	310.03±1.45
PC82	446.32±5.31	6.5±0.58	0.96±0.03	310.78±9.70	138.11±13.46	46.30±2.45	22.48±0.85	69.29±6.65	466.09±18.62	6.78±0.64	48.13±3.43	324.62±17.54
PC73	443.13±3.53	6.71±0.58	0.98±0.03	290.64±8.51	138.94±11.27	42.37±2.20	21.34±0.74	66.56±6.21	453.70±18.51	6.88±0.70	43.57±3.19	297.75±18.24
PC64	439.93±1.75	6.93±0.59	1.00±0.04	270.50±7.41	139.77±9.18	38.43±1.94	20.21±0.63	64.01±5.81	441.87±19.41	6.97±0.75	39.30±3.00	271.95±18.56
PST811	441.44±6.97	6.64±0.44	0.96±0.03	311.60±9.39	128.77±14.43	49.78±2.32	21.61±0.81	66.80±4.43	458.00±15.98	6.87±0.32	47.07±1.77	323.04±6.07
PST721	437.54±5.90	6.67±0.42	0.96±0.03	293.79±8.41	124.81±12.24	47.91±2.03	20.57±0.64	65.88±3.96	455.98±14.58	6.94±0.30	44.17±1.59	305.93±2.97
PST712	434.06±6.20	7.18±0.32	1.01±0.03	289.93±8.11	125.05±13.08	47.27±1.97	19.50±0.70	60.61±2.61	428.49±12.37	7.08±0.15	40.44±0.72	286.01±1.58
PST631	433.64±4.88	6.70±0.41	0.96±0.03	275.98±7.85	120.85±10.10	46.03±1.74	19.53±0.47	64.98±3.60	453.96±13.45	7.00±0.29	41.31±1.65	288.69±0.05
PST622	430.16±5.17	7.21±0.31	1.01±0.03	272.12±7.43	121.08±10.92	45.40±1.68	18.46±0.53	59.79±2.25	426.48±11.57	7.14±0.14	37.8±0.85	269.61±1.13
PST613	426.68±5.46	7.71±0.21	1.06±0.03	268.26±7.04	121.32±11.75	44.76±1.62	17.39±0.59	55.34±1.31	401.78±10.24	7.26±0.02	34.78±0.33	252.46±1.93
PSC811	445.62±5.98	6.31±0.55	0.94±0.02	313.12±9.45	133.33±13.47	48.36±2.42	22.58±0.80	71.16±6.50	477.05±17.76	6.75±0.56	49.88±3.15	335.09±12.96
PSC721	441.72±4.90	6.34±0.53	0.93±0.02	295.31±8.20	129.36±11.25	46.49±2.13	21.54±0.63	70.14±5.93	474.99±15.45	6.81±0.54	46.79±2.72	317.42±9.50
PSC712	442.42±4.21	6.53±0.55	0.95±0.02	292.98±8.12	134.15±11.20	44.43±2.16	21.44±0.69	68.29±6.06	464.00±16.09	6.84±0.61	45.13±2.89	307.29±14.04
PSC631	437.83±3.87	6.37±0.51	0.93±0.02	277.51±7.32	125.40±9.06	44.61±1.84	20.50±0.47	69.14±5.45	472.93±13.24	6.88±0.51	43.75±2.46	299.61±6.19
PSC622	438.53±3.15	6.56±0.52	0.95±0.02	275.17±6.80	130.19±8.96	42.55±1.87	20.40±0.52	67.32±5.52	461.91±13.56	6.91±0.59	42.17±2.47	289.83±10.68
PSC613	439.23±2.44	6.74±0.55	0.97±0.03	272.83±6.83	134.98±9.00	40.49±1.91	20.30±0.57	65.61±5.65	451.58±16.05	6.94±0.67	40.68±2.68	280.63±14.79
PCT811	442.14±6.28	6.82±0.46	0.99±0.02	309.26±9.35	133.56±14.34	47.73±2.36	21.51±0.86	65.13±4.65	447.63±14.2	6.90±0.40	45.47±2.05	313.00±10.41
PCT721	438.95±4.51	7.04±0.47	1.01±0.02	289.12±8.06	134.39±12.08	43.79±2.10	20.37±0.75	62.67±4.37	435.83±12.40	6.98±0.46	41.21±1.97	287.08±11.50
PCT712	434.76±5.50	7.36±0.35	1.04±0.02	287.59±7.84	129.83±12.98	45.21±2.00	19.40±0.76	59.2±2.89	419.25±9.66	7.09±0.24	39.12±0.98	277.23±5.64
PCT631	435.75±2.74	7.25±0.47	1.03±0.02	268.97±6.83	135.21±9.89	39.86±1.85	19.23±0.63	60.36±4.10	424.57±12.27	7.07±0.52	37.21±1.92	262.17±12.27
PCT622	431.57±3.74	7.58±0.35	1.06±0.01	267.45±6.49	130.66±10.71	41.28±1.75	18.26±0.64	57.10±2.73	408.50±7.36	7.17±0.31	35.35±1.03	253.14±6.82
PCT613	427.39±4.75	7.90±0.23	1.09±0.02	265.93±6.44	126.11±11.62	42.70±1.65	17.29±0.65	54.15±1.64	393.50±6.57	7.27±0.10	33.67±0.31	244.76±2.17
PSCT7111	438.24±5.20	6.85±0.43	0.98±0.02	291.45±8.00	129.60±12.11	45.85±2.07	20.47±0.69	67.75±5.76	457.21±15.3	6.90±0.42	46.53±2.96	310.20±9.41
PSCT6211	434.35±4.16	6.88±0.41	0.98±0.02	273.65±6.99	125.63±9.90	43.97±1.78	19.43±0.53	63.34±3.71	443.54±10.29	7.02±0.35	39.85±1.43	279.32±4.45
PSCT6121	435.05±3.45	7.07±0.44	1.00±0.02	271.31±6.62	130.42±9.83	41.91±1.81	19.33±0.58	61.81±3.88	433.76±10.11	7.04±0.44	38.49±1.58	270.49±8.53
PSCT6112	430.87±4.45	7.39±0.32	1.03±0.02	269.79±6.69	125.87±10.76	43.34±1.72	18.36±0.59	58.41±2.46	417.21±8.11	7.15±0.21	36.54±0.70	261.14±3.14

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初始物质含量 Initial concentration	马尾松 P. massoniana	檫木 S. tzumu	香樟 C. camphora	香椿 T. sinensis
C /（g·kg^-1）	452.71±6.27A	413.74±2.77B	420.77±6.32B	378.95±2.42C
N /（g·kg^-1）	6.07±0.41C	6.37±0.40BC	8.22±0.47B	11.46±0.40A
P /（g·kg^-1）	0.92±0.02C	0.88±0.02BC	1.11±0.07B	1.41±0.06A
木质素 Lignin /（g·kg^-1）	351.07±8.64A	173.01±9.96B	149.63±4.16BC	134.4±6.02C
纤维素 Cellulose /（g·kg^-1）	136.46±12.72A	96.83±4.54B	144.72±5.81A	99.19±3.51B
总酚 Total phenol /（g·kg^-1）	54.17±2.10A	35.42±0.11B	14.82±0.30D	29.05±0.44C
缩合单宁Condensed tannin /（g·kg^-1）	24.75±0.77A	14.37±0.43B	13.38±0.07B	3.67±0.01C
C/N	75.34±5.43A	65.47±3.93AB	51.52±2.81B	33.16±1.33C
C/P	492.79±16.40A	472.55±11.19AB	380.54±21.27B	269.45±8.99C
N/P	6.59±0.38A	7.26±0.35A	7.47±0.76A	8.17±0.54A
木质素/N Lignin/N	58.24±2.86A	27.50±2.92B	18.38±1.52BC	11.76±0.67C