Fine Root Carbon,Nitrogen and Phosphorus Stoichiometry and Storage in Different Stand Ages of Soft-Broadleaved Forests in Guangxi

doi:10.13466/j.cnki.lczyyj.2023.05.009

Abstract

Abstract:

The objective of this research was to investigate different stand age classes of fine root carbon(C),nitrogen(N)and phosphorus(P)stoichiometric characteristics and their storages.Five representative soft-broadleaved forests were selected as the research objects.Fine root samples were taken at depth intervals of 0~<20 cm and 20~40 cm soil layers in each sample-plot for indoor measurements.And the variation laws were investigated for different age classes and different soil layers for the fine root C,N,P stoichiometric characteristics and their storages in GuangXi soft-broadleaved forests.The result showed that:1)the C content of fine roots did not have a significant change with the change of forest stand ages and soil layers.The N and P contents of the fine roots differed significantly for different stand ages.While their highest values were both found in mature forest,their lowest values were found in middle-aged and pre-mature forest,respectively.2)As the forest grows older,the C/N of fine roots showed a downward trend,and the C/P and N/P normally showed a trend of first increasing and then decreasing.3)The average distribution of fine root biomass and C,N and P storage in soft broad-leaf forests in Guangxi were 7.77~12.26 t/hm²,3 324.18~4 974.21 kg/hm²,44.06~103.36 kg/hm²,7.19~13.62kg/hm²,respectively.4)The fine root C,N,P storage and biomass of soft-broadleaved forest in Guangxi showed a decreasing trend with the deepening of soil layer and the growth of forest age.Fine root growth in soft-broadleaved forest was generally limited by nitrogen.Nitrogen input should be emphasized in each stand ages of soft-broadleaved forest.

Key words: stand ages, soft-broadleaved forest, fine root, stoichiometric characteristics, carbon, nitrogen and phosphorus storage

CLC Number:

S718.5

LIAN Ziwen, HUANG Rongwei, DU Hu, ZENG Fuping, PENG Wanxia, YIN Lichu. Fine Root Carbon,Nitrogen and Phosphorus Stoichiometry and Storage in Different Stand Ages of Soft-Broadleaved Forests in Guangxi[J]. Forest and Grassland Resources Research, 2023, (5): 72-79.

Figures/Tables 5

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变量	龄级		土层		龄级×土层
变量	F	P	F	P	F	P
C含量	0.58	0.68	0.60	0.45	0.43	0.78
N含量	33.69	<0.01	41.62	<0.01	14.49	<0.01
P含量	32.21	<0.01	2.67	0.12	5.48	<0.01
C/N	20.05	<0.01	18.48	<0.01	6.48	<0.01
C/P	32.84	<0.01	0.19	0.67	10.74	<0.01
N/P	58.57	<0.01	36.75	<0.01	18.35	<0.01
生物量	60.80	<0.01	566.47	<0.01	5.59	<0.01
C储量	7.24	<0.01	82.40	<0.01	1.02	0.42
N储量	37.27	<0.01	259.99	<0.01	29.95	<0.01
P储量	22.10	<0.01	142.90	<0.01	12.19	<0.01

龄级	C/(g/kg)	N/(g/kg)	P/(g/kg)	C/N	C/P	N/P
幼龄林	405.24±45.61a	7.21±3.09ab	1.08±0.24b	65.88±27.93ab	388.09±79.45b	6.53±2.00ab
中龄林	429.65±24.78a	4.48±0.92b	1.17±0.16b	100.70±28.16a	373.33±66.69b	3.81±0.64b
近熟林	429.22±41.29a	10.50±1.81a	0.77±0.10c	42.22±10.06b	572.80±116.21a	14.49±5.22a
成熟林	432.38±32.11a	11.15±3.82a	1.54±0.08a	42.98±14.98b	281.09±25.73c	7.22±2.40ab
过熟林	427.08±14.25a	7.44±1.75a	1.07±0.11b	60.64±16.87b	402.33±30.25b	7.11±2.14ab

龄级	生物量/(t/hm²)	C储量/(kg/hm²)	N储量/(kg/hm²)	P储量/(kg/hm²)
幼龄林	12.26±0.50a	4 974.21±696.33a	94.82±8.41a	13.62±1.77a
中龄林	9.46±0.44b	4 012.07±107.93b	44.06±6.52b	11.40±0.33b
近熟林	9.61±0.54b	4 127.42±635.37b	103.36±5.28a	7.19±0.63c
成熟林	8.12±0.20c	3 537.05±146.04b	100.45±8.80a	12.68±0.13ab
过熟林	7.77±0.26c	3 324.18±546.83b	55.23±1.63b	8.33±0.74c