Ecological econometric characteristics of carbon, nitrogen, phosphorus, and potassium in the seedling stage of Cyclobalanopsis pachyloma

doi:10.16178/j.issn.0528-9017.20240163

Abstract

Abstract:

Cyclobalanopsis pachyloma is a provincially protected plant with extremely small populations in Zhejiang Province. Studying the carbon (C), nitrogen (N), phosphorus (P), and potassium (K) contents and stoichiometric ratios in C. pachyloma plants can provide critical data to support nutrient management during the seedling stage. This study analyzed the biomass and C, N, P, K contents in different organs of 1-, 3-, and 5-year-old C. pachyloma seedlings in Taishun County. The results showed that the basal diameter of C. pachyloma increased with tree age, and the increment in biomass across tissues followed the order: leaves>stems>roots. The average C content in leaves and stems was significantly higher than in roots, while the average N and K contents in leaves were significantly (P<0.05) higher than in stems and roots. No significant differences in P content were observed among roots, stems, and leaves. The N content in roots of 3-year-old seedlings was significantly lower than in 1- and 5-year-old seedlings. The P and K contents in roots, stems, and leaves of 1-year-old seedlings were significantly higher than in 5-year-old seedlings. The C∶P, N∶P, K∶P ratios in roots, stems, and leaves, as well as the N∶K and C∶K ratios in roots and stems of 1-year-old seedlings, were significantly lower than those of 3- and 5-year-old seedlings. The allocation of C across tissues generally followed: stems>leaves>roots. The average allocation proportions of N and K across tissues were leaves>stems>roots, while for P, the proportions were stems=leaves>roots. Leaf C content was significantly positively correlated with N content. Seedling growth was primarily limited by N; thus, nitrogen fertilization should be increased in future nutrient management practices to promote seedling growth.

Key words: Cyclobalanopsis pachyloma, tree age, tissue, carbon, nitrogen, phosphorus, potassium

CLC Number:

S718.5

JIANG Yanping, PAN Xiangdong, LEI Zupei, WU Jiasen, LIU Xi. Ecological econometric characteristics of carbon, nitrogen, phosphorus, and potassium in the seedling stage of Cyclobalanopsis pachyloma[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(10): 2418-2425.

Figures/Tables 7

References 37

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树龄/ a	地径/ mm	根		茎		叶		全株生物量/ (g·株^-1)
树龄/ a	地径/ mm	生物量/(g·株^-1)	占比/%	生物量/(g·株^-1)	占比/%	生物量/(g·株^-1)	占比/%	全株生物量/ (g·株^-1)
1	5.22	5.06	31.8	6.46	40.7	4.37	27.5	15.89
3	9.58	42.96	33.9	48.12	37.9	35.83	28.2	126.91
5	12.69	74.36	28.4	107.8	41.2	79.60	30.4	261.76

树龄/ a	地径/ mm	根		茎		叶		全株生物量/ (g·株^-1)
树龄/ a	地径/ mm	生物量/(g·株^-1)	占比/%	生物量/(g·株^-1)	占比/%	生物量/(g·株^-1)	占比/%	全株生物量/ (g·株^-1)
1	5.22	5.06	31.8	6.46	40.7	4.37	27.5	15.89
3	9.58	42.96	33.9	48.12	37.9	35.83	28.2	126.91
5	12.69	74.36	28.4	107.8	41.2	79.60	30.4	261.76

器官	C	N	P	K
根	364.78±25.53 b	4.77±0.16 b	1.03±0.18 a	9.20±1.02 b
茎	431.69±8.35 a	5.09±0.20 b	1.10±0.18 a	9.01±0.60 b
叶	413.11±10.51 a	11.08±0.23 a	1.10±0.18 a	14.72±0.36 a

器官	C	N	P	K
根	364.78±25.53 b	4.77±0.16 b	1.03±0.18 a	9.20±1.02 b
茎	431.69±8.35 a	5.09±0.20 b	1.10±0.18 a	9.01±0.60 b
叶	413.11±10.51 a	11.08±0.23 a	1.10±0.18 a	14.72±0.36 a

器官	C∶N	C∶P	C∶K	N∶P	N∶K	K∶P
根	76.47±7.26 a	354.16±36.54 a	39.65±4.23 a	4.63±0.51 b	0.52±0.04 b	8.93±0.91 b
茎	84.81±8.35 a	392.45±40.23 a	47.91±5.49 a	4.63±0.47 b	0.56±0.05 b	8.19±0.87 b
叶	37.28±3.69 b	375.55±39.47 a	28.06±3.02 b	10.07±1.26 a	0.75±0.08 a	13.38±1.57 a